Blood Pressure Watch

When people have their blood pressure measured in the hospital, nervousness can lead to abnormal blood pressure. In addition, human blood pressure changes at any time, even if a single measurement can obtain accurate results, it is difficult to reflect the overall picture of the working condition of the cardiovascular system.

Unlike traditional sphygmomanometers, which measure blood pressure by temporarily blocking arterial blood flow and then deflating it, the new sphygmomanometer calculates blood pressure by monitoring how fast pulse waves travel along the arteries in the hand, scientists said. This sphygmomanometer is much lighter than ordinary portable sphygmomanometers and can be worn around like a watch.

By continuously measuring blood pressure, the sphygmomanometer allows doctors to understand the wearer's blood pressure in detail and detect abnormal conditions in time. It will eventually be possible to use this data to predict the timing of heart attacks.

1 in 4 American adults has high blood pressure, and 1 in 3 of them don't know they have it. Because a stroke often occurs within 3 hours after a person wakes up, and during this period.

There are two types of sphygmomanometers: direct and indirect. The working principles of the two sphygmomanometers are different. The direct type uses a pressure sensor to directly measure the pressure change; the indirect type works by controlling the pressure applied to the measured part from the outside, and correlates the control results with it. The information on the occurrence and disappearance of Korotkoff sounds can be judged. The former can continuously test both arteries and veins, while the latter can only measure arterial systolic and diastolic blood pressure.

The measurement principle of the watch-type sphygmomanometer adopts the oscillometric method, which is accurate in principle. Its clinical verification is designed with the auscultation method as the standard and the statistical method is used. Auscultatory method) and Oscillometric method.

The auscultation method has its inherent shortcomings: First, there has been a debate on whether the diastolic blood pressure corresponds to the fourth phase or the fifth phase, which leads to a large discriminant error. The second is to judge systolic and diastolic blood pressure by listening to Korotkoff sound. The readings are affected by a series of factors such as the doctor's mood, hearing, environmental noise, and the tension of the subject, which are prone to introduce subjective errors and are difficult to standardize.

Although the electronic sphygmomanometer based on the principle of auscultation has achieved automatic detection, it has not completely solved its inherent shortcomings, namely, large error, poor repeatability, and easy noise interference.

At present, most blood pressure monitors and automatic electronic blood pressure monitors use the oscillometric method to indirectly measure blood pressure. Blood pressure measurement by oscillometric method determines blood pressure by establishing the relationship between systolic blood pressure, diastolic blood pressure, mean pressure and cuff pressure shock wave.

Because the pulse pressure shock wave has a relatively stable correlation with blood pressure, in the application of actual home blood pressure measurement, the blood pressure result measured by the oscillometric principle is more accurate than the auscultation method. Moreover, when measuring blood pressure by oscillometric method, there is no sound pickup device in the cuff, the operation is simple, the ability to resist external noise interference is strong, and the average pressure can be measured at the same time.

It must be pointed out that in terms of measurement principle, there is no question of which of the two indirect measurement methods is more accurate, so it does not mean that the results measured by 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 results of an electronic sphygmomanometer are more accurate than those obtained by auscultation using a mercury pressure gauge.