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What should we pay attention to when using electronic sphygmomanometer correctly?

One is that everyone's blood pressure changes a lot in a day. Strictly speaking, people's blood pressure is not the same at every moment. It changes with the changes of people's psychological state, time, season and temperature, as well as the measured parts (arms or wrists) and body positions (sitting or lying). Therefore, it is normal to measure different values of blood pressure each time. For example, due to tension and anxiety, people's systolic blood pressure (high pressure) measured in hospital is generally 25 mmhg-30 mmHg (.. 4 kpa-4.0 kPa) higher than that measured at home, and some even have a difference of 50 mmHg (6.67 kPa).