The deviation of the measured value of the wristband and the blood pressure meter is determined by many factors:
1. The measurement part of the sphygmomanometer is in the brachial artery, and the measurement part of the bracelet is in the two main branches of the arterioles. Under normal circumstances, the measured value of aortic blood pressure and the measured value of arteriolar blood pressure will differ by 30-40
2. If you use a watch and a sphygmomanometer to measure at the same time, because the blood flowing in the artery is in the centrifugal direction, the band below the middle of your elbow will be under pressure during the measurement of the sphygmomanometer, and the blood cannot flow smoothly to the lower part for the time being. Arterial branch flow
3. Increased vascular tension will cause greater deviation of upper and lower blood pressure measurements