Electronic sphygmomanometers are accurate within their own product specifications and should be viewed in general terms.
But electronic sphygmomanometers, like mercury sphygmomanometers (manometers), need to be calibrated on a regular basis, usually for one year.
Factors affecting the accuracy of electronic sphygmomanometer measurements include:
1. First-generation (mechanical fixed-velocity exhaust valves), which are usually considered less accurate due to the use of rubber valves that are prone to deterioration; this technology has already been eliminated by the mainstream manufacturers of electronic sphygmomanometers;
2. Different manufacturers of electronic sphygmomanometers have completely different software, and their measurements vary in Stability and accuracy also vary greatly;
3, uncalibrated, or not regularly calibrated, for the reasons described above;
4, improper use: the correct use is to test the process of the cuff (or wristband, finger ring) to maintain the same level with the heart, but also to talk about the quiet seat, emotional stability ......; <
Expanded Information:
Electronic sphygmomanometer Note:
The bottom of the cuff should be in the arm above the elbow socket 1 to 2 centimeters place, cuff wear incorrectly measured results are different again and again.
The mercury sphygmomanometer requires the user to be professionally trained, but also with the stethoscope to use, so it is really not very convenient for the family, and sometimes the measurement results are not allowed is actually caused by the patient's inappropriate use of the method.
For example, some people are not sure of the correct position of the sphygmomanometer cuff, so the results of each blood pressure measurement are different. In fact, whether it is a mercury sphygmomanometer or an electronic sphygmomanometer, the bottom of the cuff should be 1~2 centimeters above the elbow socket of the arm. Some patients wear the cuff too high or too low, and the pressure has changed when the blood flow passes through these places, and the measurement is certainly inaccurate.
In addition, some electronic sphygmomanometer cuffs have a range of 22 to 32 centimeters, but some users' arm circumference is greater than or less than that of the cuff, so their blood pressure measurements may also be inaccurate. Therefore, it is important to have an appropriately sized cuff and to wear it in the right place.
On the other hand, it is also important to fix a time of day to measure blood pressure. Some people measure their blood pressure if they get up early in the morning and the next day at noon. It is important to realize that a person's blood pressure varies relatively a lot during the day.
Strictly speaking, a person's blood pressure is not the same at every moment, and will also change with the person's psychological state, time, season, temperature changes, as well as the measurement of the different parts of the body, position. Therefore, the time for measuring blood pressure should be fixed every day. Doctors suggest that the best time to measure blood pressure should be early in the morning after getting up, when people are in a resting state, more truly reflect the level of blood pressure.