Principle of Home Electronic Sphygmomanometer

by | Mar 26, 2021 | Blood Pressure, BP Monitors

The principle of home electronic sphygmomanometer adopts the oscillometric method, which is accurate in principle. Its clinical verification is designed with the auscultation method as the standard and statistical method. In the modern indirect blood pressure measurement method, it is divided into the auscultatory method (Auscultatory method) and oscillometric method (Oscillometric method).

The auscultation method has its inherent shortcomings: First, there has been controversy over whether the diastolic blood pressure corresponds to the fourth phase or the fifth phase, and the discrimination error caused by this is very large. The second is to judge systolic blood pressure and diastolic blood pressure by listening to Korotkoff’s voice. The readings are affected by a series of factors such as the doctor’s mood, hearing, environmental noise, and the testee’s tension, which easily introduces subjective errors and is difficult to standardize.

Although the electronic sphygmomanometer made on the principle of auscultation method realizes automatic detection, it has not completely solved its inherent shortcomings, that is, large errors, poor repeatability, and susceptibility to noise interference.

Most blood pressure monitors and automatic electronic sphygmomanometers use the oscillometric method to measure blood pressure indirectly. The oscillometric method determines blood pressure by establishing the relationship between systolic blood pressure, diastolic blood pressure, mean pressure and cuff pressure shock waves.

Because pulse pressure oscillating wave has a relatively stable correlation with blood pressure, in the application of self-testing blood pressure at home, the blood pressure measured by the principle of the oscilloscope is more accurate than the auscultation method. In addition, there is no pickup device in the cuff when measuring blood pressure by oscillometric method, which is easy to operate and has a strong anti-interference ability of external noise. It can also measure the average pressure at the same time.

It must be pointed out that from the measurement principle, the two indirect measurement methods do not have the problem of which one is more accurate. Therefore, it does not mean that the results of the auscultation method using the mercury pressure gauge are more accurate than the measurement results of the electronic sphygmomanometer. Of course, it is also wrong to think that the measurement result of the electronic sphygmomanometer is more accurate than the result measured by the auscultation method using a mercury pressure gauge.

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