Good old mechanical blood pressure monitors look reliable, but hearing heart rhythms with them is still a challenge. And many do not have a heart for electronic ones, because only yesterday their manufacturers stamped toasters and teapots. But to listen to the body - do not boil a seagull. And measurement error can be expensive. What tonometers lie, and how can and should be entrusted to the heart?
It is especially important not to miss the moment for people at an age when the vessels are less elastic and even a small jump in pressure can lead to tragedy. However, how much can you trust the readings of home blood pressure monitors? According to experts, they need to be compared with the standard.
What can be said about the manual blood pressure monitor, which is used in all hospitals in the country? Deviation from the reference value is 0.2 millimeters. Even according to strict standards of the Ministry of Health, this error is considered negligible. So, in your experiment, this tonometer can be taken as a standard.
Next in line is a semi-automatic tonometer for 1,500 rubles. Galina Nikolaevna, who recently celebrated her anniversary, agreed to test it. The device itself measures the pressure and automatically bleeds air. In parallel, we check the readings using a phonendoscope. 120 by 70, and the tonometer shows 119 by 67. The difference is rather big, but within acceptable limits.
And what will the standard show? Deviation is 0.5 millimeters of mercury. But why the error of half a millimeter on the standard in practice has grown to three? This happened due to the condition of the skin, due to the condition of the tissues, due to the weight of the person who measures this pressure. The tonometer, it turns out, is best selected individually according to age and weight.
Next in line is an automatic tonometer (1890 rubles). Tests him Anastasia. She is 32, and she is hypotensive, that is, for her, the norm is low pressure. In fact, the pressure was 92 by 73, and the tonometer showed 101 by 68. Such a deviation by the Ministry of Health is no longer allowed. After all, with a large error, the beginning of a critical pressure jump can also be missed.
Everything is the same as for an automatic one, only the control center is in the application that needs to be downloaded to the phone. That's just the pressure can jump, looking at the price tag (11,990 rubles). The application showed 87 by 52, while the doctor heard about 90 by 60. And here the difference is greater than the allowable one by the Ministry of Health.
The price of this device is 1905 rubles. In the experiment, he showed 142 by 79. We recheck these readings with a phonendoscope - 125 by 80. The difference is 17 millimeters. And this is unforgivable a lot.
Doctors ask to remember these results and the fact that their home electronic blood pressure monitors need to be checked using a manual blood pressure monitor at an appointment with your doctor.
The program “Live healthy” with Elena Malysheva. About medicine
September 4, 2017
If you incorrectly measure blood pressure, then when measuring pressure, you may make a mistake of 72 mmHg. Art.
Common mistakes that people make when measuring pressure:
- Hand on weight (approximately +7 mmHg)
- Tense posture (approximately +10 mmHg)
- Full bladder (approximately +15 mmHg)
- The cuff is dressed on clothes (up to + 40 mmHg)
Examination of tonometers
Specialists of the All-Russian Scientific Research Testing Institute of Medical Technology investigated tonometers of the following brands: AND, Microlife, Omron, Tensoval, B. Well.
Studies have shown that all of these tonometers comply with their technical documentation.
The first place in accuracy was taken by the Omron tonometer, the second place - Tensoval, the third place - AND, the fourth place - Microlife and the fifth place - B. Well.
The biggest difference from the true value was only 12 mmHg. Art., which is the permissible error of the device.
When buying a tonometer, you need to pay attention to the following:
1) the tonometer must have a registration certificate,
2) the tonometer must have a certificate of verification (a special stamp in the documents of the device).
Do automatic blood pressure monitors lie?
Visitors periodically come to our service center, declaring - "My tonometer is lying!" We have gathered a little analytics, and we want to talk about the most common misconceptions regarding accuracy pressure measurements.
1. Misconception number 1. "My pressure is a constant value. I bought a tonometer and measured the pressure at home - it was like that. And then I measured it at the doctor’s (at a neighbor, in a pharmacy, at home with my old tonometer, etc.) - it was completely different! The conclusion is yours tonometer is lying!"
In fact - if you just follow the banal logic - then on the basis of such stories it is impossible to draw a conclusion about which of the two tonometers lied. And the correct answer is that none of the tonometers did not lie. And that's why.
Arterial pressure - not a constant value. It depends on many factors - time of day, body position, physical activity, etc. Even if with the same tonometer you take several consecutive measurements with an interval of several minutes, the result will vary. For this reason, in the recommendations of the Ministry of Health on blood pressure measurement it is indicated that it is necessary to make not one but three consecutive measurements, calculating the average value. Of course - before the start of measurements it is necessary to calm down, not to show physical activity, not to eat and not smoke. Many blood pressure monitors are equipped with a function of fixing the average value of blood pressure measurements. However, it is important to understand that this function only makes sense if you fix the time and date of each measurement. For example, the OMRON M3 Expert tonometer will determine the average pressure only if the last three measurements have been taken in the last 10 minutes, since the tonometer has fixed date and time measurements. Agree, it would be strange to determine the average value of pressure between yesterday and today’s measurements.
2. Misconception №2. "The doctor measured my pressure with a mechanical precision tonometer, and your automatic shows a different value! Mechanical blood pressure monitor much more accurate "
If you do not consider the reasons indicated in Misconception No. 1, it is worth adding that according to the rules of any measurements, the accuracy of any device is half the scale. The scale on mechanical tonometers most often has a graduation of 2 mm Hg. Thus, the accuracy of the manometer itself is half the scale division - 1 mmHg. Moreover, since the measurement is carried out indirectly, i.e. Since the doctor independently determines the moment of termination of the audible tones, then the doctor makes an additional error in the measurement process. If the pressure is not measured by a mechanical tonometer by a doctor, then the error is even greater. Plus, a person who independently pumps air into the cuff - performs physical activity, so undesirable at the time of measurement. Hence the disappointing conclusion - the total error in measuring pressure with a mechanical tonometer is + -15 mmHg.
Absolutely all automatic tonometers OMRON have a measurement accuracy of + -3 mmHg. Moreover - Intellisence technology allows you to make the measurement even more accurate, fast and comfortable for the patient.,