Blood pressure is not constant. When measured with a mercury sphygmomanometer, the blood pressure value is often an integer. However, human blood pressure fluctuates all the time. Of course, the value measured with an electronic sphygmomanometer is the same as before. The measured blood pressure value is different. The principles of electronic blood pressure monitors and hospital ambulatory blood pressure monitors are the same. They both use the oscillometric method. On the contrary, no user doubts the accuracy of the ambulatory blood pressure monitor, so it is often the user's psychological effect.
Blood pressure is essentially fluid pressure. The blood pressure value measured by raising the hand will be lower, and the blood pressure value measured by hanging the hand down will be higher. Therefore, please be sure to sit upright when measuring, try to ensure that the vertical distance from the top of the head to the heart is roughly equal during each measurement, and keep the wrist strap at the same height as the heart. Don't use force on your palms, just open them naturally and don't make a fist.
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Generally, the length range of electronic blood pressure monitor cuffs is 20 to 34 cm. When purchasing, you should choose according to your own situation. A blood pressure monitor with a correspondingly sized cuff that fits the thickness of your upper arm.
Ask the salesperson or staff with medical knowledge to measure the user's blood pressure once with a mercury sphygmomanometer, rest for 3 minutes, and then measure once with the electronic sphygmomanometer you are about to purchase. The difference between the two results should be within 0.05 kPa.
Focus on warranty service. Choose products from companies with nationwide networked warranty capabilities to ensure that they can be repaired in time if a product fails.
Baidu Encyclopedia-Electronic Blood Pressure Monitor