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This problem, because of the many factors that influence it, is based on experience and the feedback I get from these patients on a regular basis for the following reasons.

1. Most home self-measured blood pressure will be a little lower than measured in the hospital, and some patients who are more nervous when measured in the hospital may have a white coat phenomenon, resulting in a higher blood pressure in the hospital and the patient mistakenly believing that his or her sphygmomanometer is inaccurate. Office blood pressure ≥ 140/90 mmHg is considered high blood pressure, while home self-measurement blood pressure ≥ 135/85 mmHg is considered high blood pressure, and the two standards are not the same.

2. The blood pressure is not measured properly, the cuff is not tied tightly and in the right position, the measurement is not done correctly, and the timing is not right. Some patients take measurements while talking loudly on the phone, or immediately after doing household chores or exercising, or just after eating, smoking, or drinking coffee.

3. Some patients also tell me that their blood pressure is not the same every time they take it during the day, so they think it is not accurate. In fact, the blood pressure of both healthy people and hypertensive patients is dynamic and cannot be exactly the same. It is usually higher in the morning and drops at night, showing diurnal variations. The fluctuations in the elderly will be greater than in younger people, as long as the fluctuations are within a certain safe range are normal.

4. Repeated measurements over a short period of time may cause changes in blood pressure measurements, and the elderly are particularly susceptible to significant differences in multiple measurements due to poor vascular elasticity. Emotional stress after a single high blood pressure measurement may also lead to higher and higher blood pressure values, and this is also common in clinical practice, with some patients even being admitted to hospital as a result.

5. It is possible that the electronic system of the electronic sphygmomanometer, such as the sensor, has failed, or that it has run out of batteries. It is important to note that electronic blood pressure monitors also need to be calibrated periodically.

1,In a quiet, relaxed, natural environment, the subject was seated upright with the feet flat against the floor

2. Remove all clothing at the wrist so that the wristband can be wrapped directly around bare skin.

3. Ask the patient to hold the hand straight out with the palm up. At 1 cm from the palm of the hand, put the sphygmomanometer on the patient's wrist with the display upward and fasten the wrist strap as tightly as the patient feels comfortable.

4. Bend your forearm upward and place it close to your chest so that your wristband is flush with your heart, and lightly rest your left elbow with your right hand.

5,Press the start button, and when it is automatically inflated and completely deflated, you can read the blood pressure data directly from the display and record the data.

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