One is that everyone's blood pressure changes 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 changes, as well as the measured parts (arms or wrists) and body position (sitting or lying). Therefore, it is normal for the values of blood pressure to differ between measurements. Due to nervousness and anxiety, the systolic blood pressure (i.e. high pressure) measured in hospitals is generally 25 millimeters to 30 millimeters of mercury (.. 4 kPa to 4.0 kPa) higher than at home, and some may even differ by 50 millimeters of mercury (6.67 kPa).
The second is that 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 position of 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 cuffs should be such that they can fit just one finger in. Secondly, it is important to maintain a quiet state for about 10 minutes before measuring. Later on, the time interval between two measurements should not be less than 3 minutes, and the position and position should be consistent. To achieve these three points, it should be said that the measured blood pressure is accurate and objective.
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**The doctor uses a mercury column sphygmomanometer to measure blood pressure. After resting for 3 minutes, an electronic sphygmomanometer is used to measure blood pressure * * times, followed by another 3 minutes of rest. Later, the doctor uses a mercury column sphygmomanometer to measure blood pressure for a third time. Take the average of * * times and the third time as the doctor's measurement value. Compared with the measurement value of an electronic blood pressure meter, the difference should generally be less than 10 millimeters of mercury (1.33 kPa). An electronic blood pressure monitor that meets this condition can be used with confidence.