Firstly, everyone's blood pressure fluctuates greatly within a day. Strictly speaking, the blood pressure of a person is different at every moment. It changes with the person's psychological state, time, season, temperature, as well as the location of measurement (arms or wrists) and position (sitting or lying). Therefore, it is normal for the values of blood pressure measured to be different each time. Due to tension and anxiety, people's systolic blood pressure (i.e. high pressure) measured in hospitals is generally 25 to 30 millimeters of mercury (0.4 to 4.0 kilopascals) higher than at home, and some may even differ by 50 millimeters of mercury (6.67 kilopascals).
Secondly, the measurement method is incorrect. When measuring, the following three points should be noted: firstly, the height of the cuff should be at the same height as the heart, and the rubber tube of the cuff should be placed at the pulsation point of the brachial artery. The bottom of the cuff should be 1-2 centimeters higher than the elbow; At the same time, the tightness of the cuff should be just enough to insert one finger. Secondly, it is necessary to maintain a quiet state for about 10 minutes before measurement. Afterwards, it is necessary to ensure that the time interval between two measurements is not less than 3 minutes, and that the location and position are consistent. By achieving these three points, it can be said that the measured blood pressure is accurate and objective.
Alternating method measurement:
**The doctor will measure the blood pressure using a mercury column sphygmomanometer. After resting for 3 minutes, the electronic sphygmomanometer will be used to measure the blood pressure * * times, followed by another 3 minutes of rest. The doctor will then use a mercury column sphygmomanometer to measure the blood pressure for the third time. Take the average of * * times and the third time as the doctor's measurement value. Compared with the measurement value of the electronic blood pressure monitor, the difference should generally be less than 10 millimeters of mercury (1.33 kilopascals). If the electronic blood pressure monitor meets this condition, you can use it with confidence.