1. Because of the blood flow direction, the blood pressure measured by the left hand and the right hand is usually somewhat different; usually the blood pressure value of the left hand will be slightly higher than that of the right hand, but the difference is normal in the range of 10~20mmHg, but the record should be higher. The measured data shall prevail. If the difference between the hands is more than 40-50mmHg, it may be that the blood vessel is blocked. It is best to consult a doctor to find out the cause.
2. It is not advisable to measure blood pressure only once. You should measure your blood pressure several times a day and record it so that you can understand the changes in your blood pressure within a day.
3. Most commercially available sphygmomanometers are electronic, and their measurement results are usually slightly higher than traditional mercury sphygmomanometers. Electronic sphygmomanometers are divided into two types: wrist type and arm type. Although the wrist type is more convenient to use, it is usually the farther away from the heart, the greater the difference in measurement results. It is recommended that you can test it on the spot when you buy it. There is little difference between the results measured by the formula, and both can be used; if the difference is large, it is better to choose the arm type.
4. It is best to measure blood pressure when you are in a relaxed mood at home, because when some people measure their blood pressure in a medical institution, they will feel nervous when facing medical staff wearing white clothes, which will increase blood pressure. Hypertension", measuring blood pressure at home can overcome this occurrence.
5. Traditional mercury sphygmomanometers will be affected by thermal expansion and contraction, and should be calibrated to zero on average every six months.
