Automatic blood pressure monitors: which one is better? Reviews and recommendations of experts. Electronic blood pressure monitor: what are its principles of operation? Specifications Devices
One of the interesting applications of modern MC is, of course, medicine. The range of devices here is quite wide, ranging from simple thermometers, where you can use a simple STM8L with an LCD screen, to sophisticated cardio monitors, ECG meters, holters with the ability to remotely collect and send information via ethernet or wirelessly from patient beds directly to the office of the head physician . Today we will talk about the possibility of using the MK STM32 for non-invasive measurement of blood pressure using the oscillometric method. I ask all those interested under cat.
Introduction
Today, the “gold standard” for measuring blood pressure is considered to be the method of “N.S. Korotkov, recognized by the World Health Organization. However, we should not forget that this is an indirect method of measuring blood pressure. Of course, the measurement of blood pressure occurs with some error, determined by the elasticity of the walls of the artery and soft tissues, the amplitude and shape of the pulse wave, and other factors that are individual for each person. If we abandon rounding and accurately use the division value of the pressure gauge, then we will see the difference between adjacent measurements and when using a mechanical device. Reading the pressure gauge readings by ear is also performed with some error, depending on individual characteristics a person - the speed of reaction, the availability of skills, etc. As a result, the error of manual tonometers consists of three components: the method itself, the accuracy of the pressure gauge and the error in determining the moment of reading the readings. In reality, its value can be up to 15 mm Hg. Art.! The measurement results are also affected by the rate of inflation into the cuff, the rate of bleeding and the amount of pressure created in the cuff. If we also add natural fluctuations in blood pressure, then the difference between two adjacent measurements can be even greater.An electronic tonometer, in principle, should have been devoid of all these shortcomings, because. tones are measured using the cuff itself, and processing is carried out using a number of patented algorithms and techniques. However, practice shows that in some cases an electronic tonometer gives a stable discrepancy with the readings of a manual tonometer. As a result - today people have a strong opinion - "electronic blood pressure monitors lie - no one will measure better than a doctor with a mercury pressure meter!" Experiments have shown that a large measurement error is caused solely by the inability of an ordinary layman to use this device, namely, to properly put on the cuff. A properly worn cuff is the key to obtaining a good envelope of Korotkoff tones and successfully finding characteristic points on the envelope.
Where to dig
There are quite a lot of literature on the method of finding blood pressure on the envelope of tones on the Internet,,,,. Freescale even has a nice appnote that popularly describes how to measure Korotkoff sounds in a cuff. But! How exactly to analyze the resulting envelope - there is practically no information anywhere. Each manufacturer of blood pressure monitors sculpts in its own way, although general technique viewed clearly. It is enough to go to freepatentsonline.com and type non invasive blood pressure in the search, and you will get enough information to write a tonometer blank. But! Further worse. Extrasystoles, artifacts, and other scary words get in the way of accurate oscillometry results...Assembly of the measuring stand
If the desire to assemble your tonometer still has not disappeared, then let's get started.… We had two cuffs, a handful of op amps, a few pressure sensors, a couple of valves, and a microcontroller. The only thing that caused me concern was MEMS pressure sensors. I knew that sooner or later we would switch to this rubbish ...
What you need for a blood pressure meter:
1) Board with MK STM32F1xx (suitable for STM32 VL Discovery with STM32F100RBT6 on board);
2) Pressure sensor MPXV5050GP (model taken from Freescale BPM Application Note, in your case there may be a different model);
3) Integrated op-amp LM358 (LM324) (it is better, of course, to take rail-to-rail);
4) Some indicator - what to show the pressure on (if there is no indicator, you can see the results in watch when debugging);
5) A pump with a motor from a Chinese blood pressure monitor or a pear from a grandmother's blood pressure monitor;
6) If, nevertheless, you took a pump with a motor from a tonometer, you will also need a slow bleed valve from the same tonometer;
7) Emergency valve (to taste - needed to quickly bleed the remaining air in the cuff after the measurement);
8) Tonometric cuff;
9) SD card with a card reader (or microSD with an adapter, to which it is not a pity to get soldered).
Figure 1 - Scheme of the pneumotract for measuring blood pressure
Let's try to understand what we have just collected. The pneumatic circuit is very simple. The pump serves to inflate the cuff, after which the air begins to slowly bleed by a non-adjustable valve with a very small opening. In this case, it should be noted that the emergency valve must be closed - otherwise you will not inflate anything! Upon completion of the pressure measurement, you can open the emergency valve and quickly release the residual pressure in the cuff.
Next, you need to collect wiring diagram to control our pneumatic path. The circuit consists of a Korotkoff tone selection unit, a pump control unit and an emergency bleed valve control unit. The pump and valve control circuits are very simple and consist, in fact, of one NPN transistor (each), which are controlled by the logic level of the microcontroller (... any GPIO). Let us dwell in more detail on the scheme for highlighting tones according to Korotkov. The scheme is implemented on the OS general use LM358, and is a bandpass filter amplifier. The task of this cascade is to isolate the constant component and highlight the so-called. Korotkoff sounds - pulsations of blood in the artery during contraction of the heart muscle. That. the analog inputs of the microcontroller receive signals directly from the analog pressure sensor and the signal allocated by the OS. To summarize: the signal from the pressure sensor consists of "beats" and a constant component of the pressure in the cuff. That. on the first channel of the ADC MK we apply slowly bled pressure in the cuff, we catch the variable component of the Korotkov tones with the operational amplifier and feed them to another channel of the ADC MK.
Figure 2 - Electrical circuit diagram measuring part and control
Figures 3 and 4 show oscillograms at the outputs, directly from the pressure sensor (Fig. 3) and at the output of the selective op-amp (Fig. 4). In Figure 4, the arrows show the "characteristic" points on the envelope of Korotkov's tones. SBP - Systollic Blood Pressure - Systolic blood pressure (upper pressure), MBP - Mean Blood Pressure - mean pressure in the artery, DBP - Dyastollic Blood Pressure - Diastolic blood pressure (lower pressure). How to find these points, and therefore, determine blood pressure, will be discussed later.
Figure 3 - Voltage at the output of the pressure sensor (air pumping cycle, bleed cycle)
Figure 4 - Voltage at the output of the op-amp. Selected tones according to Korotkov
Summarize. We have assembled the pneumatic tract, made electronics for its maintenance. In the next part, we will talk about how to connect the entire MK with a display and an SD card to this and start “listening” to the forearm. The result should be data on the SD card, which we visualize in Excel and try to process using the simplest algorithms for calculating blood pressure.
Figure 5 - Data from sensors recorded on the SD card during the measurement
Figure 5 shows:
- in this embodiment, my bleed is stepped;
- Korotkov's tones (pressure pulsations in the cuff) are recorded in full.
- the maximum amplitude of Korotkoff tones is calculated on the fly.
Why stepwise bleed? The fact is that with stepwise bleeding, we get a bunch of bonuses by dimension. For example, we can measure two tones in one step of the cuff pressure value, i.e. filtering extra systole. Or, if the resulting envelope is problematic, download to the area of interest to us and measure the tones on it again. This is already a feature of heart monitors. You can generally implement a measurement in the ascending section of the pressure in the cuff (pumping):
1) Close the valve;
2) Make an additional pump for 50 units;
3) Measure Korotkov's tones;
4) Go to point 2 until we measure the entire envelope, otherwise go to point 5;
5) Calculate SBP, DBP based on envelope parameters
6) Display the result.
Figure 6 - The result of calculating the values of SBP and DBP
Explanations for Figure 6:
1) Row 1 - signal directly from the pressure sensor - pressure level in the cuff (slow bleed phase);
2) Row 2 - Calculated Systolic BP value;
3) Row 3 - Calculated diastolic blood pressure value;
4) Row 4 - Envelope of Korotkoff tones (not the tones themselves, but the values of the amplitudes of the peaks).
In the course of numerous experiments (which continue to this day), it turned out that the calculation of the Korotkoff peak value is the key in the entire blood pressure measurement cycle. The better you measure the envelope, the more accurately you will know the value of blood pressure.
Here are some videos explaining the whole process. All videos feature a device to which the developed tonometer is connected - “a simulator of a person with a given blood pressure”. Pressure can be selected from presets. Then the device imitates heartbeats (Korotkoff sounds), and the tonometer measures the envelope. On the second video (Part 2) I ran the tonometer through all the main modes of the simulator. In case of hypertension, the algorithm does an additional pump, everything is as it should be! The third video (Part 3) shows the measurement cycle on real person(on me).
Video 1 - Patient simulator, Korotkoff sounds on an oscilloscope
Video 2 - Running the tonometer over all blood pressure limits on the simulator
Video 3 - Measurement of blood pressure on a person
Literature:
Oscillometric blood pressure monitor and method employing non-uniform pressure decrementing steps. (US Patent No. US5170795);Determination of oscillometric blood pressure by linear approximation. (US Patent No. US5577508);
Method and apparatus for measuring blood pressure by the oscillometric technique. (US Patent No. US6719703);
Oscillometric determination of blood pressure. (US Patent No. US6893403);
Oscillometric determination of blood pressure. (US Patent No. US7311669).
How pressure is measured by a mechanical, semi-automatic, automatic, carpal tonometer.
Tonometer It is a device that measures blood pressure. As a rule, a tonometer is a cuff that must be put on the arm of a person whose pressure you want to know. The cuff is connected to a device for pumping air into it and a pressure gauge that determines what pressure is in the cuff.
Tonometers are:
- mechanical
- semi-automatic
- automatic
Mechanical tonometer.
A mechanical tonometer is equipped with a stethoscope or a phonendoscope, and an automatic and semi automatic blood pressure monitor special electronic device to fix air fluctuations in the cuff.
When pressure is measured using a mechanical tonometer, a cuff is put on the area of \u200b\u200bthe right or left arm from the elbow to the shoulder, and then air is injected into it using a special pear until the pressure of this air is higher than the upper pressure. Then, having applied the phonendoscope to the inside of the elbow, you need to slowly deflate the cuff. When the air pressure in the cuff decreases to the level of systolic pressure, the so-called clicks can be heard in the stethoscope. The lower pressure corresponds to the readings at the moment of cessation or a sharp weakening of the clicks.
Thus, the tonometer is designed so that the cuff pinches the artery when the pressure in it exceeds the blood pressure. And when, on the contrary, the blood pressure becomes greater than the pressure in the cuff, the artery straightens with characteristic clicks that can be heard when air is forced into the cuff and released smoothly by placing the phonendoscope on the radial artery.
Semi-automatic and automatic tonometers.
A semi-automatic blood pressure monitor works on the same principle, but it does not require a stethoscope to measure blood pressure. The built-in electronics itself will determine when the artery straightens, according to bursts of air pressure in the cuff itself. The semi-automatic tonometer kit includes a pear for air injection, and it is bled automatically. The tonometer, which inflates and releases air on its own, is automatic.
Blood pressure monitors play an important role in the consistent and reliable diagnosis of hypertension. Such devices are always available in several modifications, including for self use at home. In this case, the process of measuring pressure can occur in different ways depending on the type of tonometer.
What determines the accuracy of tonometer readings? This indicator depends on how much the pressure in the cuff decreases during the time interval between clicks (usually 1 second). Obviously, if you deflate their cuffs too quickly, the measurement will not be accurate.
Blood pressure monitors on the wrist are also arranged, with the only difference that during the measurement, the body of the device is located on the wrist, and the cuff is fastened over the arm. The blood pressure is measured in the radial artery at inside wrist. Such a tonometer has somewhat less accuracy, since the artery on the wrist is thinner, it has less blood pressure, and, accordingly, the amplitude of air oscillations in the cuff is lower. For a reliable measurement, it is necessary to observe required condition- a hand with a tonometer should be in the heart area or measure in a prone position.
The convenience and ease of use of such blood pressure monitors has led to the fact that now they can be freely purchased at the nearest pharmacy and even via the Internet. To measure pressure with an automatic blood pressure monitor, you do not need special medical knowledge or professional qualifications. In addition to automatic air supply to the cuff, many blood pressure monitors have such additional functions, as a memory for the last few measurements, automatic shutdown of the device, average pressure calculations, arrhythmia detection, pulse counting.
Question: What is a tonometer and what is it used for?
Question: What are the types of tonometers? What are the main differences?
Automatic blood pressure monitors are a more modern development. In such models, air is forced into the cuff using a compressor by pressing a button. An example is the AND 777 AC tonometer. In semi-automatic tonometers, air is injected manually by means of a “pear”.
As for the forearm models, the measurement with their help is made (the cuff is superimposed) on the forearm. Illustrate this species can sphygmomanometer Microlife BP A100 Plus.
Carpal sphygmomanometers are used to measure arterial blood pressure at the wrist. An example is the Nissei WS 820 tonometer.
Our company (online store www.site) offers wide range of high-quality tonometers of the world's leading brands. Both forearm and wrist models are presented, as well as accessories for blood pressure monitors.
Question: Which tonometer to prefer: forearm or carpal? Help me make a choice!
The choice of a tonometer depends entirely on your age and individual characteristics of the body. For the elderly, as well as people with serious illnesses and inactive people, we recommend purchasing a pre-arm tonometer, since most models have no age restrictions and are most suitable for use in stationary conditions.
For active and energetic people who are in constant motion, we recommend opting for a carpal tonometer. Wrist models are compact, lightweight, easy to transport and can easily fit into a handbag or even into a pocket of clothes. At the same time, under normal conditions, they are no less accurate and reliable than forearm ones.
Question: Are automatic blood pressure monitors really that accurate?
If you make the measurement correctly, then the maximum error of automatic blood pressure monitors is +/-3 mm. rt. Art. It is the incorrect use of the tonometer, as a rule, that causes inaccuracy. Use the tonometer as instructed.
Question: I am an elderly person, I am over 60, but I want to purchase a carpal tonometer, a compact device. After all, as far as I know, some models of carpal tonometers also do not have age restrictions.
You are absolutely right, some models of wrist blood pressure monitors do not really have age restrictions. However, we still do not recommend purchasing carpal tonometers for the elderly. This is due to the fact that with age, the vessels on the human wrist lose their elasticity. This is the reason for a more significant measurement error.
When ordering, be sure to contact our specialists. You will be provided professional help and will help you decide on the choice of the device, as well as make sure that the selected model is compatible with the children's cuff.
Question: I need a blood pressure monitor as a gift for my husband, but he has a very big hand and the standard cuff will not fit. What are the options?
We have cuffed models for large (L) and extra large (XL) arms. For example, AND 777 AC-L blood pressure monitor, or OMRON blood pressure monitors with fan-shaped cuffs up to 42 cm in diameter. Contact us for advice and assistance in choosing a model individually for your spouse.
Question: Do more expensive models really give a more accurate measurement result?
All models of blood pressure monitors presented in our assortment are products of the world's leading brands and have high quality. The difference in price, as a rule, is due to the range of functions performed by the device. The choice in this case should be made based on your individual needs, and not on the price of the device.
If you are in doubt about the choice, contact our consultants for help and remember: one of essential principles our company is customer-oriented and long-term cooperation, but not the extraction of momentary profit.
Question: If the device does not suit me, can I return it or exchange it for another model?
The tonometer is a medical product that has direct contact with the human body. In accordance with Art. 25 of the Law of the Russian Federation "On Protection of Consumer Rights" and Decree of the Government of the Russian Federation of 19.01.98 No. 55, in order to comply with sanitary and hygienic requirements, medical instruments, devices and equipment of good quality SHALL NOT be returned or exchanged for a similar product (other design, model, size, etc.).
We work strictly in accordance with applicable law, therefore we are not entitled to take the purchased device back, or replace it with another model. If you have any doubts about the choice, we kindly ask you to contact our company for professional advice and assistance in choosing the device.
Question: Which device is right for me? What model do you recommend?
The choice of a model depends on many factors and there is simply no single answer, as well as a universal model that would suit absolutely everyone. A lot depends on the individual characteristics of your body. Contact our specialists, and you will certainly be provided with qualified advice and select the device individually for your needs and characteristics.
Question: I do not like the color and design of the blood pressure monitor I purchased. I want to return it.
Given the fact that the tonometer belongs to the category of medical equipment, Article 25 of the Law of the Russian Federation "On the Protection of Consumer Rights" and Decree of the Government of the Russian Federation of 19.01.98 No. 55 prohibit us from accepting the device from you, as well as exchanging it for a similar device of a different color and design. Our company operates in full compliance with current legislation.
Return and exchange of goods is possible only in the case of a manufacturing defect. We kindly ask you to specify the details regarding the color, size, design, and technical characteristics of the device in advance in order to avoid unpleasant misunderstandings.
Question: What is the guarantee that I will purchase an original, high-quality blood pressure monitor, and not a counterfeit at the price of the original?
One of the most important principles of our company's work is real assistance to the client and long-term cooperation. We are not interested in making instant easy profits at the cost of defrauding buyers and a bad reputation. Our company has been working in this area for several years and does not change the high quality standards of the products sold and customer service.
We work only with reliable and trusted suppliers of world famous brands. All products are imported legally, cleared and certified.
When purchasing goods, we provide the entire package of accompanying documentation: cash receipts, invoices, invoices (for cashless payments), as well as copies of certificates, registration certificates and sanitary and hygienic characteristics. Documents are sealed with signatures and original seals.
Question: I need a tonometer. But I live far from Moscow, there is no representative office of your company in my city either. You work on the terms of 100% prepayment. Where is the guarantee that after payment I will receive the device in proper condition? And will I get it at all?
We work reliably and efficiently, and therefore we have been confidently holding onto the market for medical and health products for several years and we value our reputation. To pay for your goods, we send a payment receipt and an invoice containing our data. If necessary, we conclude an agreement in 2 copies. All documents are sealed with our seals and signature CEO companies.
In addition, all devices are subject to mandatory testing before shipment, and delivery is carried out only by reliable and proven by long-term cooperation. transport companies and delivery services.
Question: I heard about the Dual Check System function in Omron blood pressure monitors, but I don’t quite understand what it is. Clarify please!
You're right. Indeed, Omron brand blood pressure monitors use the so-called Dual Check System, that is, a double system for monitoring measurement results. Its essence lies in the fact that two sensors are installed in the device, as a result, two measurement results are compared and compared, and the user sees the more accurate one.
In addition, if the readings of the sensors differ by more than 40%, the user receives a message about the malfunction of the device. Examples of models with the Dual Check System function are the Omron M6 blood pressure monitor and the Omron M6 Comfort blood pressure monitor.
Question: What is Intellisense Technology? I've heard the name many times, but I still don't have the exact idea. In what devices is it used? Tell!
Intellisense technology is used in Omron blood pressure monitors. Its meaning comes from the name: intelli- (intelligent) - “smart” (translated from English) and sense - from English. "feeling", "feeling". That is, it is a kind of "electronic brain" of the device, which allows, based on the user's sensations, to pump air into the cuff up to optimal level in order to obtain the most accurate result, while avoiding "pumping" the cuff, accompanied by painful sensations.
A similar function is also found in automatic blood pressure monitors from other companies under other patented names: FuzzyLogic - in blood pressure monitors of the brands and, Intellitronics - in blood pressure monitors of the brand, IQ System - in.
Question: I have an arrhythmia. Does this affect the measurement results in any way? Are there models of blood pressure monitors that can diagnose and take into account arrhythmia in the process of measuring pressure?
Yes, arrhythmia affects the measurement results. Unfortunately, negatively, that is, distorts them. However, there are devices that can diagnose arrhythmia and correct the measurement results given the fact of its presence. Outstanding representatives such devices are the Omron M6 tonometer and the Omron M6 Comfort tonometer.
Question: What is the measurement error of the tonometer models presented in your store?
All models of blood pressure monitors presented in our store are fully automatic. Their error is +/-3 mm. rt. Art. The error can increase significantly if the tonometer is used incorrectly (non-compliance with the operating rules), as well as if wrong choice models (large cuff for a standard arm size, carpal model for an elderly person, a device without arrhythmia indication for a person with arrhythmia, etc.).
Please, before buying, contact our specialists for qualified advice, and before use, carefully read the instructions and follow them clearly.
Question: How to use the tonometer correctly in order to achieve the most accurate measurement results?
To achieve the most accurate results, it is important to choose the right tonometer model, taking into account the individual characteristics of your body and strictly follow the instructions for use. Both the cuff of the forearm and the carpal tonometer should be at the level of the heart. Failure to comply with this simple rule is fraught with a significant distortion of the measurement results.
The principle of communicating vessels, familiar to us from the school physics course, operates here. If the cuff or wrist tonometer is below or above the level of the heart, this principle is violated, which entails incorrect readings of the devices. Some models of blood pressure monitors are equipped with a sensor for the correct position of the hand, and the measurement starts only in the correct position, which guarantees an accurate result.
Question: What is the Fuzzy algorithm for?
The Fuzzy algorithm automatically selects the inflation pressure of the cuff. Using the Fuzzy algorithm, the device itself determines required level pumping pressure based on the individual characteristics of a person. Thanks to the Fuzzy algorithm, the tonometer is easier to use and the measurement is faster and more accurate.
Question: I'm afraid the cuff will be too small for me.
If the cuff size does not match the size of the arm, the accuracy of the measurement may be reduced. The error cannot be predicted in this case. We have extra cuffs different sizes. We will help you choose it.
Question: Instead of results I see an error message, why is this happening?
This can happen if the cuff is not inflated to desired pressure, poorly fixed, extraneous sounds are heard. Check if you put on the cuff correctly, if it is well fixed, check the instructions.
Question: The air from the cuff of my blood pressure monitor drops sharply.
Maybe it's the batteries. Or, if you connected the blood pressure monitor to the network, then this adapter could be faulty. It is possible that the bladder in the cuff is leaking. Contact the service center.
Question: Batteries drain frequently and quickly. What happened?
In automatic blood pressure monitors, the compressor requires a lot of current. Use quality batteries. Replace all batteries at the same time.
Question: My blood pressure monitor is low. What do you recommend doing?
If you have semi automatic device, then look at the volume of the hand. The pressure relief valve in the semi-automatic tonometer is adjusted to the average size the hands of an adult, from 23 to 32 cm.
If your hand volume is very different from the average, the etching speed in the upper pressure range is not correct. Use cuff more right size and with an adjusted pressure relief valve.
Check if the cuff is on correctly. Read the company's instructions.
Question: Are there any features of measuring pressure in overweight people?
Oh sure. You will probably need a larger cuff for this. To obtain accurate measurement results, it is necessary that the length of the cuff pneumatic chamber be at least 80% of the circumference of the arm on which the measurement is made. The cuff width should be about 40% of the circumference of the arm.
In electronic semi-automatic devices, as a rule, when changing the cuff to a cuff of a different size, it is necessary to adjust the evacuation valve. The principle of adjusting the bleed valve depends on specific model and specified in the instructions for the device.
It must be remembered that most electronic blood pressure monitors for individual use are designed for an adult with an average body size. For obese people, it would be more correct to use mechanical blood pressure monitors with a properly selected cuff. If you use a short or narrow cuff, this may result in high readings.
Question: What conditions must be met to fulfill the warranty obligations?
The warranty does not apply to products that are out of order and/or have defects due to:
Non-intended use;
. careless use resulting in mechanical damage;
. modifications; opening and/or repair by an unauthorized organization (private person);
. violation of the rules of operation, or/and storage, or/and transportation;
. actions of third parties or force majeure.
The warranty does not cover batteries for electronic devices. To obtain warranty service, you must submit: a warranty card, a document confirming payment for the goods (cash receipt), the purchased goods. Warranty cards that are not filled out or not completely filled out by the seller, with erasures and corrections, will not be accepted.
Question: Should I exchange the product for a similar one?
In accordance with Art. 25 of the Law of the Russian Federation "On Protection of Consumer Rights" and Decree of the Government of the Russian Federation of 19.01.98 No. 55, in order to comply with sanitary and hygienic requirements, medical instruments, devices and equipment of good quality CANNOT be returned or exchanged for a similar product (other design, model, size, etc.).
Question: I handed in the device for warranty repair, should I be provided with a similar device for the period of repair?
According to Article 19 of the Law of the Russian Federation "On Protection of Consumer Rights" and Decree of the Government of the Russian Federation of 10.01.98 No. 55, in order to comply with sanitary and hygienic requirements, the buyer is NOT PROVIDED with similar goods for use during the repair of electronic medical devices.
Question: At each next measurement, the tonometer shows different results.
A person's blood pressure is constantly changing (almost with every heartbeat) and never stays the same. It is for this that some modern tonometers have a calculation function medium size pressure based on the results of the last 3.
Here are just a small and incomplete number of factors that affect pressure changes: time of day, temperature, stress, frequency of measurements, food intake, coffee consumption, smoking, alcohol consumption, anxiety.
Question: Why and what interval should be observed between measurements?
Question: Tell me, how many measurements will a set of batteries last for me?
Depending on the type of tonometer and device model, one set of batteries for an automatic tonometer can last from 120 to 1500 measurements. It should be remembered that the supplied batteries are designed to test the instrument's performance, and their service life may be shorter than recommended alkaline batteries. More information on specific types tonometers ask our consultants.
Question: I got a blood pressure monitor from you. It worked great, but my unconscious little daughter dropped it in a basin of water (the dog pushed it off the shelf and the device hit the floor). Now the device has started to malfunction. Can you replace the device, because I'm not to blame for the breakdown?
We understand and sympathize with you, but, unfortunately, there is a malfunction due to the fault of the buyer. Please keep the device out of the reach of children and animals, treat the device with care. According to the Consumer Protection Law, we are not entitled to accept the device from you, as well as replace it with a similar one. Exchanges and returns are only possible in the event of a manufacturing defect.
You can contact the service center (contact details are indicated in the warranty card) and carry out repairs on their terms, since the warranty does not apply to your case, unfortunately. *Note: Omron sphygmomanometers are shockproof, which has been proven in tests.
Question: My device is defective. I measured the pressure twice, the third time it simply did not turn on. What should I do?
Most likely, there is a factory marriage (although this happens extremely rarely, since all tonometers are repeatedly calibrated). You need to contact the service center for independent expertise(contact details of the service center are indicated on the warranty card).
You can transfer the device to us, or you can apply yourself. The second option will be more efficient, since service centers process applications from individuals much faster than from organizations. In addition, you have the right to be present during the examination.
In the event that a manufacturing defect is found, we will refund the amount paid and accept the defective device, or (at your request) replace it with a similar serviceable one in accordance with the Consumer Rights Protection Law.
Question: My device constantly shows different results. It may be defective. Or am I doing something wrong? Help to understand, please!
This is quite natural, since the pressure of a person is constantly changing under the influence of various factors that affect the body (for example, weather changes and stressful situations).
If you still doubt the readings of the device, do the following: carefully check whether the device is connected correctly; check the instructions and follow them exactly. You can also ask our consultants for help.
If the problem persists, please contact the manufacturer's service center. The address and contact details are indicated in the warranty card.
Question: I bought a blood pressure monitor in your store for personal use. Works great. I want to buy some devices for the hospital where I work. Can I count on any special conditions (discounts, gifts)? Is cashless payment possible?
thanks for positive feedback about the quality of the product! We are glad that you liked the device. Of course, as our regular customer, especially when buying several goods of the same name, you have the right to count on special conditions.
When buying several units of the same product, it is possible to provide a discount in monetary terms. Also, when buying many models of blood pressure monitors, we give our customers pleasant and useful gifts. In addition, if the amount of your order is large enough, we are ready to deliver the goods to you free of charge throughout Moscow, the Moscow region, as well as to most settlements in the Russian Federation.
When placing an order, please mention that you are not contacting us for the first time, and we will agree on the conditions for providing a discount, as well as the possibility of free delivery. Our company works both for cash and non-cash payments.
Question: In what case is the choice of a blood pressure monitor on the wrist justified?
Blood pressure monitors on the wrist are in most cases recommended for people under the age of 40. This is due to the fact that the arteries on the wrist are thinner than the arteries on the shoulder, and therefore the pulse and blood pressure in the vessels are less distinguishable. In addition, with age, there is a thickening and compaction of the walls of the arteries. Therefore, in people over 40 years of age, readings may be distorted when measuring pressure on the wrist, and it is not recommended to purchase such a device for them.
Blood pressure monitors on the wrist are also suitable for people leading active image life and sports. The peculiarity of such devices is their compact size and light weight (80-140g), they are convenient to take with you anywhere. In addition, they can be used to control the heart rate during exercise.
Question: What is the WHO pressure indicator in tonometers and why is it needed?
The world standard for blood pressure norms is the classification of the World Health Organization, created in 1999 with the joint participation of experts from the World Health Organization (WHO) and the International Society for Arterial Hypertension (ISH) based on large-scale studies.
Most of the automatic blood pressure monitors presented in our online store are equipped with a color WHO classification scale and a WHO indicator, which, after measuring blood pressure, shows in which area of the scale these readings are located and to which category of blood pressure they can be attributed. This information will help you pay attention to the application in time necessary measures to normalize the pressure or tell you that you should not postpone a visit to the doctor if your readings fall into the dangerous "red" zone.
Question: What, besides measuring blood pressure, can a tonometer help with?
Almost all blood pressure monitors presented in our online store have an arrhythmia indicator, which notifies you of violations of the normal frequency or periodicity of heartbeats during the measurement. If the indicator appears too often when measuring pressure, you should consult a doctor, as arrhythmia is dangerous even with normal blood pressure values.
Question: Are automatic wrist blood pressure monitors as accurate as automatic upper arm blood pressure monitors?
The principles of measuring pressure in tonometers on the shoulder and on the wrist are essentially similar. If you measure with a carpal tonometer correctly, keep your hand in the correct position, and do not use the tonometer for people over 40 years old or with a weak pulse, then you can expect readings of the same accuracy as if you measured with an automatic tonometer on the upper arm.
Question: What are the pros and cons of automatic blood pressure monitors?
To strengths automatic blood pressure monitors, of course, can be attributed to ease of use. The whole process is started by pressing just one button without spending any effort on pumping air on the part of a person. In addition, the undoubted advantage of automatic blood pressure monitors over other types of blood pressure monitors is their functionality. A lot of additional options will help you diagnose deviations in your health in time, use the automatic mode to take three measurements in a row, save data with the date and time of measurements, and in some models even output them to a computer and print them out.
In addition to the above options, each model has its own unique features about which our consultants will tell you in more detail. In addition, you can choose tonometers with stylish design. The most important feature, of course, is the high accuracy of automatic blood pressure monitors.
However, the accuracy of the tonometer is affected by many factors: electromagnetic radiation, hand movements, correct posture, the presence of diseases, and whether the person is in a calm, relaxed state. These factors can reduce the accuracy of readings. To prevent this from happening, perform blood pressure measurements using automatic blood pressure monitors strictly according to the attached instructions. Another disadvantage is the high price of the device compared to other types of tonometers.
Question: How often and where to calibrate an automatic blood pressure monitor?
The recommended period for the verification of an automatic tonometer is every two years. However, if there is any suspicion that your blood pressure monitor has stopped functioning correctly, you can get tested at any time at service center, whose address and telephone number are indicated in the warranty card. If you cannot find this information, contact our consultants and they will tell you the address and phone number.
To date, most often pressure is measured electronically.
tonometers. They are convenient, easy to use, and you do not need to work with them.
acute hearing. How is the tonometer arranged? Let's take a look and see.
Electronic blood pressure monitors are convenient, easy to use, and sharp hearing is not needed to work with them.
In this view, we consider it necessary to focus on two things.
First. When studying the operation of the device, inscriptions are very useful.
on printed circuit boards. Pay attention to the callout in the lower right corner.
Valve 2 is written on the board next to the contact pads. Valve on
English means "valve". Hence the coil soldered to these
contacts is a valve.
The second concerns details. On the chip (callout on the right in
in the middle) is marked with the name of the company that produced the tonometer, which means
that the chip is specialized and made to order, and
therefore, it won’t be possible to use it somewhere, and even order it for
replacement is not possible.
All pneumatics of the tonometer are clearly visible. In the bottom half
housing cylinder - compressor. The air blown by the compressor
pipe system enters the pressure sensor, valve, throttle and fitting.
The principle of operation of the tonometer is as follows. After turning on the compressor
begins to inflate the cuff. Since the performance
compressor is many times greater than the rate of air bleeding through
throttle, the pressure in the cuff increases. Pressure is constantly measured
sensor (located on printed circuit board), and as soon as it reaches
a certain value (for example, 170 mm Hg) compressor
turns off. The pressure gradually drops as the air is bled off
through the throttle. When the pressure is compared with the value of the "upper"
pressure in human vessels - pulsations appear in the pneumatic system
pressure, with heart rate. These pulsations are fixed
pressure sensor. When the pressure falls below the "lower" pressure,
pulsations stop. The electronics records the pressure, after which
pulsations are gone. After fixing the "lower" pressure,
voltage on solenoid valve and air from the cuff
very quickly go through open valve. Then the tonometer
shows the result.
Very interesting choke design:
In order to provide an acceptable amount of throttling
flow need to make a small hole. Technological equipment
to create even small holes is quite difficult and expensive, therefore
the manufacturer solved the problem simply and gracefully. The tube ends
silicone stopper. A slot is made in the cork, but what would the slot not
closed, a piece of thin wire was inserted into it. In the Foto
On the left, the wire is shown from two angles.
Compressor:
The principle of operation of the compressor is no different from the principle
aquarium compressor action, forward movement only
is created not by a lever with an electromagnet, but by a system of a wheel and a lever.
The shaft rotates and the rotation is converted through a lever attached to
the edge of the circle, in the swing of the Y-shaped part (I don’t know what to call it),
which alternately compresses 3 rubber chambers with valves.
Blood pressure - the most important indicator human health, deviation from the norm is a symptom of the disease, and excess is life-threatening. Half of people over 70 suffer from hypertension and need to have their blood pressure checked regularly and keep records for their doctor. These actions are quite complicated, therefore, for elderly relatives, it is recommended to purchase automatic blood pressure monitors. What are the pressure meters, how to choose the best one and not pay too much, and how to measure pressure with this item?
Advantages of an automatic blood pressure monitor
Mechanical measuring method
The method of measuring blood pressure, which has been used by therapists for over 100 years, was proposed in 1905 by the Russian surgeon N.S. Korotkov. The doctor puts an inflatable cuff on the patient's arm and inflates it with a rubber pear, with a pressure gauge attached to it. Then the doctor slowly releases the air while listening to the heart rhythm with a stethoscope. By the appearance of the heartbeat, the therapist determines the systolic (upper), and by its disappearance - the diastolic (lower) pressure. This mechanical measurement method bears the name of Dr. Korotkov, is officially approved by WHO and is considered the most accurate.
Flaw mechanical method: measurements should be carried out by a professional with extensive experience. It is not easy to independently measure blood pressure with a sphygmomanometer, especially for older people. It is necessary to properly inflate the cuff, carefully bleed the air and hear the necessary sounds in time.
Semi-automatic measuring method
To simplify the procedure for patients, engineers have created semi-automatic blood pressure monitors. They have the same cuff and hand pump, only the heart sounds are “listened” not by the sensitive ear of the doctor, but by the electronic circuit. The readings are processed by the computer, the results are shown on the indicator screen.
Advantages of a semi-automatic device:
- the patient can measure the pressure on their own;
- a stethoscope is not needed, a person does not need good hearing;
- no analog pressure gauge, no sharp eyesight required;
- no electric air pump, batteries will last a long time;
- a semi-automatic device is cheaper than an automatic one.
Disadvantages of a semi-automatic tonometer:
- the patient himself pumps air into the cuff with a hand pear;
- a person can exceed the pressure or bleed air unevenly - this affects the accuracy of measurements;
- the elderly, especially those with limb diseases, find it difficult to manipulate the pump.
For elderly relatives who need regular blood pressure monitoring, purchase an automatic blood pressure monitor.
Pressure is determined by automation
To get rid of the shortcomings of semi-automatic blood pressure monitors, the designers created a one-button device. The patient only needs to correctly put on the cuff and press the key. The electronics will inflate the cuff to a predetermined level, bleed air, detect heart sounds, measure pressure and display heart rate.
The advantage of an automatic blood pressure monitor: fully automatic measurement of blood pressure and other indicators. Flaw: high price.
What to look for when choosing an automatic blood pressure monitor
Hand size
Before heading to the store, measure the circumference of the user's arm midway between the elbow and shoulder.
According to this parameter, cuffs for blood pressure monitors are produced in the following main sizes:
- 18–22 mm (S) - small cuffs, suitable for children;
- 22–32 mm (M) - cuffs standard size, suitable for most patients;
- 32–45 mm (L) - large cuffs, needed for athletes or overweight people;
- 45-52 mm (XL) - very large, required for obese people.
Choose a blood pressure monitor with a cuff of the right size - the manufacturer indicates its parameters in the specifications.
Attention! A cuff that is too loose or too tight will distort measurements.
If people of different sizes use the blood pressure monitor at home, look for models with interchangeable cuffs, or choose a device with a universal cuff, 22–45 mm.
Symptoms of arrhythmia
Arrhythmias, or abnormal heart rhythms, occur in 70% of people over 50 years of age. Skipping a beat or extraordinary contractions of the heart muscle affect the accuracy of pressure measurement, so an automatic tonometer must be able to detect arrhythmia.
If you or your relatives are over 50 years old, it is recommended to purchase a blood pressure monitor with an arrhythmia sensor.
An automatic blood pressure monitor that takes into account possible arrhythmia monitors the patient's pulse and performs repeated measurements at the moments of a stable pulse. If the device has detected an arrhythmia, a flashing heart icon appears on the device screen.
If during the process of measuring pressure the arrhythmia icon appears frequently, this is a reason to consult a doctor.
Measurement logs and tonometer users
People suffering from abnormal blood pressure should have regular measurements. Usually, the attending physician requires that a measurement log be kept indicating the time of measurements and the pressure value. Choose an automatic blood pressure monitor with memorization of previous measurements.
If more than one person in the family uses the blood pressure monitor, for example, elderly couple, choose a blood pressure monitor with user switching. In this case, each person will have their own measurement log available.
The OMROM M6 Family tonometer is equipped with a mechanical user switch. The same lever can be used to maintain independent logs of measurements, such as morning and evening.
Some models of blood pressure monitors have an additional "guest" mode. If a neighbor came to measure the pressure, her data will not affect the statistics of regular users.
Display and indication
Most often, tonometer users are elderly people whose vision is far from ideal. Please note that the numbers on the display are large and contrasting.
Even a fully automatic device requires the right actions from the user. To help control the position of the cuff and the immobility of the arm will help additional sensors tonometer. If the patient did not secure the cuff correctly or moved during the process, the electronic circuitry will display the corresponding icon on the screen and repeat the measurements.
Mains power supply
Feature of automatic blood pressure monitor - electric air pump that consumes energy. All automatic blood pressure monitors are powered by batteries. If the battery is discharged, the measurement accuracy will be reduced. Half of the devices produced include an adapter for mains power.
If the device will be used more than twice a day, if your relatives live far away and cannot replace the batteries themselves, it is recommended to buy a tonometer with an additional mains power supply.
How to choose an automatic blood pressure monitor?
All automatic blood pressure monitors use the principles laid down by Dr. Korotkov. However, the method of measuring pressure is different, it is called oscillometric. In the cuffed artery, blood pulsations occur, which cause changes in air pressure in the inflated cuff. Electronic circuit captures these changes and displays the upper and lower blood pressure on the screen.
Tonometers are produced by companies specializing in medical equipment:
- Japanese company OMRON - takes 20% Russian market tonometers, the devices are very reliable and durable, but their price is 30-50% higher than for models from other manufacturers - 2000-7000 rubles.
- The Japanese company A&D is the owner of the patent for the oscillometric method, which is used in all automatic blood pressure monitors. The company's devices occupy 20% of the Russian market, they are slightly cheaper than 1500-5000 rubles.
- The Swiss company Microlife produces medical equipment for self-diagnosis. Microlife tonometers occupy about 10% of the market in Russia, they are of high quality and accurate, while their prices are significantly lower (1800-4000 rubles).
- The Nissei trademark is owned by the Japanese company Nihon Seimitsu Sokki Co., Ltd. First in the world electronic device for measuring pressure produced by the company in 1978. In Russia, the company occupies about 4% of the market, devices cost 2000-4000 rubles.
- The German company Beurer, founded as a family business at the beginning of the 20th century, produces heating pads and electric blankets. Among the company's products there are also automatic blood pressure monitors (3% of the Russian market). Prices are in the range of 1000-4000 rubles.
Companies produce blood pressure monitors for mounting on the shoulder (shoulder) and on the wrist (wrist).
There are also devices - bracelets, as well as those attached to the finger. However, they cannot be taken seriously - the accuracy is too low.
Video: how to choose an electronic blood pressure monitor
Shoulder blood pressure monitors with basic functions
By its design, the tonometer with a cuff attached to the shoulder resembles the classic sphygmomanometer by Dr. Korotkov. The inflatable cuff wraps tightly around the shoulder above the elbow and is secured with Velcro. The air duct from the cuff is connected to a small box with a screen and buttons.
The shoulder tonometer is suitable for people of all ages, especially recommended for the elderly.
The OMRON M2 Basic blood pressure monitor measures blood pressure in the range of 0–299 mmHg. st, as well as a pulse rate of 40-180 beats / min. Remembers only the last measurement. Powered by four AAA batteries (enough for 300 measurements). The device can work from the network adapter. There are configurations without an adapter, you need to check with the seller. The average price is 2000 rubles.
The A&D UA-888E tonometer costs 1,600 rubles. Measures pressure in the range of 20–280 mm Hg. Art., pulse 40-200 beats / min. The device has a memory for 30 measurements, next to the screen there is a color scale for assessing pressure according to WHO metrics. The device is powered by four AA batteries, the model with the letter E (economy) does not have a power adapter included.
A simple blood pressure monitor Microlife BP 3AG1 can detect arrhythmia, the fuzzy logic circuit takes into account its manifestations during measurements, and an icon is displayed on the screen. To power the blood pressure monitor, four AA batteries are required, the AC adapter is not included. The last measurement is stored in memory.
Budget blood pressure monitor Nissei DS-500 costs 2300 rubles. However, it allows you to keep a record of pressure for two users - 30 values for each. Power is provided by four AA batteries or a mains power supply. The device can detect arrhythmia in a patient, in this case the tonometer takes several measurements and calculates the average value.
For only 1400 rubles, Beurer offers the Beurer BM16 model. The easy-to-operate silver box measures blood pressure, taking into account the detected arrhythmia, as well as the pulse, displaying the numbers on a large LCD screen. Pressure measurement range 0–299 mmHg st - suitable even for severe arterial hypertension. The device is designed for shared use, for each of the two patients it stores up to 50 measured pressure values. The device is powered by four AA batteries; in order to save money, the power adapter is not included.
Carpal sphygmomanometers
Tonometers, which are placed on the wrist for measurement, are called carpal. Unlike the brachial, pressure is measured on the radial artery, in the same place where the pulse is usually checked. Hence the second name - pulsed. By design, wrist sphygmomanometers are similar to a huge watch worn on the arm. Nutrition from external source they are not provided.
Pulse tonometers are not suitable for everyone. The maximum age of patients should not exceed 40 years.
With age, the walls of the vessels become denser, and the Korotkoff sounds are less distinguishable. Therefore, it is necessary to measure pressure in people over 40 years old only on the shoulder. Every year, manufacturers talk about another "revolution" in measuring wrist pressure, and practice continues to show the complete unsuitability of measurements in late adulthood and beyond.
Nevertheless, all manufacturers have models of pulse tonometers. They are compact and easy to use.
The Omron R1 tonometer has a cuff measuring 14–22 cm, is powered by two AAA batteries, and remembers the last measurement. IntelliSense technology allows you to quickly measure the pressure in one cycle without first inflating the cuff. The device costs 1600 rubles.
The A&D UB-202 wrist meter is very similar to the UA-888 shoulder model, only the box is adapted to the arm and weighs 100 g instead of 265 g. Cuff size 13.5-21.5 cm. The device has a memory for 90 measurements, determines arrhythmia and calculates value in three counts. Powered by three AAA batteries.
The small and light Microlife BP W100 blood pressure monitor (130 g with batteries) combines in one case not only a pressure gauge, but also a clock with a calendar and two alarms. The manufacturer recommends it for athletes and travelers. The device is powered by two AAA batteries and stores up to 200 measurements. For such a combine, you will have to pay 2600 rubles.
AT model range Nissei's blood pressure monitors also have a pulse device that is not inferior to shoulder models. In a small case weighing 110 g, an intelligent system is placed that determines the pressure taking into account possible arrhythmias, a four-line display and two separate memory blocks of 30 cells each. The manufacturer claims a special form of the cuff, M-Cuff, which helps to improve the accuracy of measurements. The price of the tonometer is 2100 rubles.
An elegant box of Beurer BC31 the size of credit card(84x62 mm, weighing 112 g without batteries), attached to the arm, measures pressure and pulse in a wide range and saves measurements in 60 memory cells. Suitable for hands with a diameter of 14–19.5 cm. Power supply - two AAA batteries. The cost of the tonometer is 1500 rubles.
Blood pressure monitors with advanced pressure measurement technologies
Thanks to the built-in microprocessor, the tonometer turns into a diagnostic station. Expensive models have increased memory and the number of users, there is a USB interface for connecting to a personal computer - the patient or the attending physician can build beautiful graphics showing health status. However, you have to pay more for these amenities.
The OMRON M10-IT blood pressure monitor comes with a rigid universal arm cuff measuring 22-42 cm. It has 84-cell memory for two users and a guest mode. The device calculates average pressure values (morning, afternoon, evening), can be connected to a computer (included - Health Management program). The device costs 9000 rubles.
To improve the accuracy of measurements, the Nissei DS-700 tonometer checks the pressure twice - the first time by the oscillometric method, the second time by the Korotkov method, compares the results and shows the most reliable one. The device costs 4000 rubles.
The unusual Beurer BM65 blood pressure monitor looks like a fairy-tale mirror that tells its owner only the truth. The device can be used by up to 10 people (30 cells for each). Large backlit screen shows pressure, pulse, time and date. It is possible to connect the tonometer to a computer via USB. The price of the device is 4700 rubles.
Tonometer rating and owner reviews
Since the shoulder and carpal tonometers are designed for different categories users, popularity ratings of blood pressure monitors and reviews about them are also given separately.
Table: rating of shoulder tonometers
| Model (Brand/Factory) | Weight, g | Battery type | Network adapter | Cuff size | Arrhythmia indicator | Other indicators | price, rub. | |
| Omron M2 Basic (Japan/China) | 245,0 | 4 x AAA | Not | 22-32 cm | 1/1 | Not |
| 2100 |
| A&D UA-888 | 240,0 | 4 x AA | Yes | 23-37 cm | 1/30 | There is |
| 2300 |
| A&D UA-777AC | 300,0 | 4 x AA | Yes | 22-32 cm | 1/90 | There is |
| 3300 |
| Omron M3 Expert | 340,0 | 4 x AAA | Yes | 22-42 cm | 1/60 | There is |
| 4000 |
| Microlife BP A100 | 735,0 | 4 x AA | Yes | 22-42 cm | 1/200 | There is |
| 3400 |
| Omron M6 Comfort | 380,0 | 4 x AA | Yes | 22-42 cm | 2/100 | There is |
| 6200 |
User reviews of shoulder tonometers
I purchased an OMRON M2 Basic blood pressure monitor. Advantages: accuracy, quality, price. Cons: None found. Comment: If you or your relatives need a convenient model of a tonometer for measuring pressure without problems, then this is the most the best way. I gave this to my mother-in-law and my parents, everyone is happy. Mom did not believe him at first, but she checked it with a mechanical tonometer and made sure it was accurate. I have had an inhaler from this manufacturer for 4 years, the flight is normal. The quality is excellent, Japan all the same! In general, everything related to OMRON can be taken, tested on a large family))))
Gapulenko Andrey
https://market.yandex.ru/product/13963021/reviews?hid=90539&track=tabs
About the A&DUA-888 tonometer. Advantages: everything is in Russian, color scale. Cons: None yet. Comment: small with large numbers, arrhythmia indicator, instructions are all in Russian.
Egorov Viktor
https://market.yandex.ru/product/13959617/reviews?hid=90539&track=tabs
Automatic tonometer A&D Medical UA-777 - High-quality necessary thing in the house. Advantages: automatic, comfortable cuff, shows the pulse. Cons: None found. This tonometer was given to me by my mother. Bought for myself and for me. my husband’s blood pressure is high, I sometimes have low blood pressure, but I’m too lazy to measure pressure, I don’t know how to listen manually, I categorically did not want to buy the device at such a young age, so I was forcibly presented :) The tonometer turned out to be very easy to use, automatic. Can be powered by mains or AA batteries. Reliable company with 10 year warranty. Measures pressure accurately enough if you follow the conditions (dress correctly, do not speak, etc.). If you measure several times in a row, the result coincides with the minimum error by one.
http://otzovik.com/review_317841.html
Omron M3 Expert blood pressure monitor - Great blood pressure monitor! will measure any pressure. Advantages: convenient, measures any pressure, and indeed there are many pluses. Cons: none. We have been using this OMRON M3 Expert blood pressure monitor for more than 5 years. We approached the choice of a tonometer very carefully, it took a long time to choose, but in the medical equipment store we were told that this one would be one of the best tonometers. It was very important for us that this device captures various heart vibrations, since several people in our family have arrhythmia. And not every tonometer can measure our pressure and pulse. And this one is very sensitive and measures perfectly! And he has an error of only + -3 mm Hg. st. is very small. In the functions there is a sound that turns off and on. It beeps when measuring pressure to the beat of your pulse and you can immediately understand whether the pulse is large or not. If you don't need it, then just turn off the sound.
http://otzovik.com/review_885751.html
The Microlife BPA100 PLUS tonometer helps me a lot. It's already my third. It was preceded by a blood pressure monitor on the wrist. I won’t say that he was very accurate, but he made it possible to decide when it was uncomfortable what to do. Alas, nothing lasts forever. I bought a new one and my choice fell on Microlife BPA100 PLUS, my first one was similar to it. Good measurement accuracy. Set the time, date, month and year. Library of previous measurements. good design and convenient use. AA batteries last a long time. And most importantly, there is an indicator of arrhythmia. True, doctors treat this function of tonometers with a smile. I did not regret that I bought!
http://irecommend.ru/content/utro-nachinaetsya-ne-s-kofe
Omron M6 Comfort tonometer - The best tonometer. Pros: accurate, comfortable. Cons: None found. Tonometer for my dad, whose blood pressure began to rise, I chose very carefully. At first I watched them in pharmacies. Then I read reviews about blood pressure monitors on the Internet. And I realized that most people praise Omron blood pressure monitors. Of all the models of this Japanese company, I liked the M6 the most. I found it the most comfortable, as it is suitable not only for the elderly, but also for middle-aged and even young people thanks to a comfortable cuff. This tonometer has many functions, it measures very accurately, with almost no error. I myself rechecked my father's blood pressure several times with a more accurate mechanical tonometer, and the blood pressure numbers always matched. This tonometer has a very large memory for 90 measurements, and not only the date, but also the time of measurement is stored. It captures the arrhythmia accurately, even when dad can change the position of the body. In general, the tonometer is excellent, very accurate and convenient. Our family is happy with it.
love love
http://otzovik.com/review_158313.html
Table: rating of good wrist blood pressure monitors
| Model (Brand/Factory) | Weight, g | Battery type | Network adapter | Cuff size | Number of users / memories | Arrhythmia indicator | Other indicators | Price |
| Omron R2 | 117,0 | 2 x AAA | Not | 14–22 cm | 1/30 | There is | Not | 2400 |
| A&D UB-202 | 102,0 | 3 x AAA | Not | 13.5-21.5 cm | 1/90 | There is |
| 1900 |
| Microlife BP W100 | 130,0 | 2 x AAA | Not | 14–22 cm | 1/200 | There is | Not | 2700 |
| B.Well WA-88 | 130,0 | 2 x AAA | Not | 14–20 cm | 1/30 | There is | Not | 1700 |
| Nissei WS-820 | 110,0 | 2 x AAA | Not | 12.5-21.5 cm | 2/30 | There is |
| 2100 |
| Beurer BC 19 | 140,0 | 2 x AAA | Not | 14–20 cm | 2/60 | There is |
| 2300 |
Feedback on the use of carpal tonometers
Omron R2 wrist blood pressure monitor - Compact, handy, but... inaccurate. Pros: Compact, easy to use. Cons: Inaccurate. This blood pressure monitor is one of my most … least favorite. Why? Outwardly, he seems to be quite good. Worn on the wrist, no laces and large blocks. Quite convenient and compact, it would seem, the acquisition. The advantages, by the way, do not end there. This technique is very smart. It has an arrhythmia indicator, an indicator of high blood pressure, as well as a memory for previous measurements (for 30 measurements). This is what concerns the pros, and now about the cons: the tonometer is intended for people under 45 years old. How often do people under 45 buy blood pressure monitors? By personal experience I know not. the tonometer is not intended for obese people. So my conclusion is this: a case, compactness, convenience are, of course, great, but do not forget about the most important thing - measurement accuracy!
http://otzovik.com/review_322875.html
Automatic blood pressure monitor on the wrist AND UB-201 - A good blood pressure monitor, but not for the elderly. Advantages: convenient, light, compact, measurement accuracy is good. Disadvantages: For people not older than 35-40 years. I have had this AND UB-201 blood pressure monitor for a long time. - 6 years exactly. It is compact, lightweight and easy to use. No frills. You put it on your wrist, press a button and wait. BUT… There is one BUT. Only about a year ago I learned from the Health program that this type of blood pressure monitor (on the wrist) is suitable only for young people up to 35–40 years old. Its values will be true in this case and then, not 100% for everyone. This is due to the fact that this tonometer measures pressure not in a vein (as classical ones), but in small blood vessels. And as a rule, small vessels with age begin to become clogged with cholesterol, elasticity is lost, etc. By the age of 35, by a maximum of 40, the condition of the vessels in all of us is usually not ideal. In general, as a result of this, the pressure in these vessels will not correspond to the real pressure. If you are young, but have some serious diseases of small vessels, then most likely it will not work either. It's probably better to consult a doctor. So keep this factor in mind when choosing a tonometer. He definitely doesn’t fit grandparents, he will lie!
http://otzovik.com/review_999288.html
Tonometer Microlife BP W100 - Did not live up to expectations. Pros: Compact, easy to use, plastic storage case, battery operated, 200 measurement memory. Disadvantages: Inaccurate measurements, high price. Each time the tonometer shows a completely different pressure during the measurement, and you don’t even know what average to derive from all the readings ... Then, you need to be completely at rest for about 10 minutes, do not talk, do not walk before the measurement, and this is unrealistic to do in working conditions or on the street. When measuring, the hand must be held either at a certain angle on the surface (at the level of the heart), or left hand put it on the right shoulder and keep it as relaxed as possible, the body should also be relaxed and no slightest movements, sharp sighs, etc. As is clear from the above, this tonometer is absolutely useless outside the house, and I don’t need it at home, because. k. I have a reliable device, and there is no need to use a wrist. In conclusion, I can only say that, unfortunately, I cannot recommend the Microlife BP W100 carpal tonometer for purchase.
apricot1992
http://otzovik.com/review_2369305.html
Wrist tonometer B.Well WA-88 - Not impressed. Advantages: Automatic, compact, large display, no need to look at the numbers. Disadvantages: a year later he began to lie. It is unusual for me that the tonometer should be worn on the wrist, and not on the shoulder, and to measure blood pressure there. Moreover, according to the instructions and recommendations on the cuff of the tonometer, the hand should not be held anyhow, but just at the level of the heart. Honestly, I don’t complain about pressure, I don’t control it until such a device is relevant to me, but I decided to test this miracle on myself -unit. I took three measurements for myself, I didn’t believe it, the next day I did a couple more approaches, again nonsense. I measured it with an ordinary tonometer in the old fashioned way, a completely different picture. Looking at the results of the measurements, I had an association with a joke about a moose that ran to a watering hole and didn’t notice that it was shot, and by the river, while drinking water, I thought: “It’s strange, I’m drinking, but I’m getting worse and worse.” So, looking at these numbers, I thought either it was time for me to go into space, or to call an ambulance. I measured it with an ordinary tonometer - 120 by 90, you must admit, the numbers differ from the automatic tonometer and, I trust the old proven method more.
http://otzovik.com/review_676838.html
Portable blood pressure monitor Nissei WS-820 - good model but there are cheaper ones. Advantages: memory for two pressure scales, a hard case convenient for transporting the device, a watch. Cons: A bit pricey for this class of device. Portable blood pressure monitor Nissei WS-820. I am an experienced hypertensive. And before purchasing this model of tonometer, I used the UB-201 tonometer of the Japanese company AND and was completely happy. For for compact models blood pressure monitors are the future, they can be used on the road, at work, and they do not take up much space. So, the WS-820 model from Nissei differs from the previous one in that it measures pressure only at the moment the pressure in the cuff decreases, unlike the AND device, which measures when the cuff is inflated, which is not good, since it additionally consumes energy, but the advantage of this model is a hard case and two memory values of pressure, which allows you to use it together as well as a watch, which is convenient, you can always determine the time. So that this model expensive can be found cheaper and also a Japanese company.
http://otzovik.com/review_113498.html
How to use the tonometer correctly
Blood pressure varies throughout the day and depends on many factors. In order for the tonometer to show the correct value, it is necessary to prepare for the measurement.
Attention! All household blood pressure monitors are intended only for assessing the state of health. Do not self-medicate. Only a doctor can make an accurate diagnosis and prescribe procedures.
- Measure the pressure at the same time, for example, in the morning. With long-term control good time for the second dimension - evening. Go to the toilet before the procedure.
- Do not smoke, drink coffee or blood pressure medication before the measurement. After jogging or climbing stairs, the pressure will be increased. Rest at least 15 minutes after light physical activity, and for an hour after sports.
- Sit down, take a comfortable position, sit quietly for about five minutes. The room should be normal, comfortable temperature. The cold will narrow the blood vessels, the pressure will rise.
- Attach the cuff to your non-working arm (left for right-handers) so that the edge of the cuff is 2-3 cm higher elbow joint. The cuff should fit snugly, but not tight. The cuff must not be worn over clothing.
- Place your arm on the table so that the middle of the cuff is in front of your heart. When measuring, the arm should be relaxed. When stressed, the pressure will rise.
- Turn on the automatic blood pressure monitor and wait for the results. Do not talk during the measurement process - the values will be distorted.
- If you think that the measurement should be repeated, do not do it right away. The deviation will be significant. Wait ten minutes and repeat the procedure. Some blood pressure monitors have the function of automatically determining the average pressure value. Such a device will independently repeat the measurement after a few seconds and display the average value.
Video: how to measure blood pressure at home
Why does the automatic blood pressure monitor show different results?
Blood pressure changes over time, so even consecutive measurements can give different results. In addition, the measurements are affected by user errors.
Table: possible user errors when measuring pressure and consequences
| Mistake | Deviation of systolic "upper" pressure | Diastolic "lower" pressure deviation |
| Rested less than an hour after exercise | Overestimated by 5–11 mm. rt. Art. | Overestimated by 4–8 mm. rt. Art. |
| Smoked before measuring | Overestimated by 10 mm. rt. Art. | Overestimated by 8 mm. rt. Art. |
| Drank coffee before measuring | Overestimated by 10 mm. rt. Art. | Overestimated by 7 mm. rt. Art. |
| Took the wrong posture, no back support | Overestimated by 8 mm. rt. Art. | Overestimated by 6-10 mm. rt. Art. |
| Took the wrong posture, hand hanging in the air | Overestimated by 2 mm. rt. Art. | Overestimated by 2 mm. rt. Art. |
| The cuff is fixed higher than necessary by 5 cm | Underestimated by 4 mm. rt. Art. | Underestimated by 4 mm. rt. Art. |
| The cuff is fixed lower than necessary by 5 cm | Underestimated by 4 mm. rt. Art. | Underestimated by 4 mm. rt. Art. |
| Measurements in a cold room | Overestimated by 11 mm. rt. Art. | Overestimated by 8 mm. rt. Art. |
| Spoke during the procedure | Overstated by 17 mm. rt. Art. | Overstated by 13 mm. rt. Art. |
| Did not visit the toilet before measurements | Overestimated by 27 mm. rt. Art. | Overestimated by 22 mm. rt. Art. |
| Tight cuff | Underestimated by 8 mm. rt. Art. | Overestimated by 8 mm. rt. Art. |
| Carpal sphygmomanometer for people over 40 | Wrong results | Wrong results |
| Re-measurement less than 5 minutes after the first | May differ by 10–20 mm. rt. Art. |
Video: are blood pressure monitors accurate
Why is the tonometer junk
Sometimes the tonometer does not show the measurement results at all, sometimes instead of numbers, various symbols are displayed on the screen. There may be various reasons for this. Since the designs of all tonometers are different, there is no universal answer - check the instructions for using your device.
Tonometer not working
Check the batteries and check if they are installed correctly. If the batteries are low, the device will not turn on. Replace the batteries with fresh ones, observing the polarity of the connection.
If after replacing the batteries the tonometer does not work, it is recommended to contact the service.
Tonometer shows symbols instead of numbers
If symbols are shown on the screen of the tonometer instead of numbers, this means that the measurements are taken incorrectly. The interpretation of symbols depends on the manufacturer, read the instructions for the device.
Table: examples of characters on the screen of the OMRON tonometer
| Symbol | Meaning | Actions |
| EE | Cuff not inflated enough | Change the settings so that the device inflates more strongly. |
| E | Measurement errors:
| Fix bugs:
|
| Battery indicator flashes | Batteries are low | Change batteries |
| Er | Instrument internal error | Remove the batteries from the device, wait 10–15 seconds, insert the batteries into the device. If it does not help, contact the service. |
Incorrect values and other difficulties
| Manifestation | Cause | Actions |
| The tonometer shows obviously incorrect values \u200b\u200b- overestimated or underestimated |
|
|
| Cuff pressure does not increase |
|
|
| Cuff deflates too quickly | The cuff is loose on the arm | Apply cuff more tightly |
| Instrument switches off during measurement | Batteries are low | Change batteries |
A blood pressure monitor is a medical device that helps you monitor your health and warn of problems in a timely manner. The choice of this device should be approached responsibly: go past cheap Chinese crafts and fashion trends like measuring pressure in a smartphone, and take a reliable device from a well-known company. When choosing a tonometer, you need to take into account the age of the patient and his diagnoses. It is necessary to prepare for the measurement of pressure, and observe simple rules during. Be healthy!