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Which is accurate between mercury sphygmomanometer and electronic sphygmomanometer?

Which is accurate between mercury sphygmomanometer and electronic sphygmomanometer? As a nurse in cardiology department, blood pressure measurement is one of the essential nursing operations in our

Do you know how to use electronic sphygmomanometer correctly?

Now there are all kinds of electronic sphygmomanometers on the market, but because the use method is difficult to master, many people are not easy to measure the accurate blood pressure value, so they