Blood pressure is one of the most common indicators that patients with cardiovascular diseases face and that doctors ask us to do self-monitoring in our lives. Let’s briefly talk about how to measure blood pressure. The first problem we have to face before measuring blood pressure is how to choose a blood pressure monitor. First clear point, at home to measure their own blood pressure is recommended to use electronic sphygmomanometer, because the mercury column sphygmomanometer single use inconvenience, there are certain requirements for auscultation, will cause a large human error. Electronic sphygmomanometer currently common three: cuff type, wrist type, finger sleeve type; three measurement principle is the same, but the wrist type because lower than the level of the heart, and finger sleeve type by the artery elastic echo influence is obvious, so the difference with the cuff type measurement value is larger, the upper arm type stability is better, recommended use. In addition, it is necessary to choose the right size cuff according to the patient’s body type. The air bag inside the cuff should wrap at least 80% of the upper arm, and most people have an arm circumference of 25-35 cm, so it is appropriate to use an air bag cuff with a width of 13-15 cm and a length of 30-35 cm. Obese people or those with a large arm circumference should use a large size cuff. Zhengzhou People’s Hospital Cardiovascular Medicine Zhang Wenju Choose a good blood pressure monitor we also need to understand the law of human blood pressure fluctuations. Blood pressure has 2 peaks and 2 valleys: 6-8 am for the first peak; 8 am after the start of the decline to noon l2 pm to 2 pm for the first trough; and then blood pressure began to rise to 5-8 pm for the second peak; after that blood pressure fell to 1-2 am for the lowest point of the day, which is the second trough. Therefore, we generally recommend getting up early to take measurements in bed, or taking measurements on time during the first peak (6-8pm) and the second peak (17-20pm). If the blood pressure is unstable, it needs to be measured 2-3 times a day; if it is stable, it can be measured once a day or once every 2-3 days. If it is the first time to measure blood pressure, it is recommended to measure blood pressure on both sides and compare the bilateral blood pressure situation. Generally, the blood pressure in the right upper arm is slightly higher than the blood in the left upper arm (below 5mmHg), if the difference is large then there may be malformation of the blood vessels in the upper arm, vasculitis or other vascular lesions, and further examination is needed. If previous blood pressure has been recorded, follow the position of previous measurements. Measurements should be taken in the morning or after 15 minutes of rest. For blood pressure measurement, sit quietly and comfortably in a seat with a backrest. Keep your legs naturally apart and relax your entire body naturally. The upper arm sleeve is removed and the balloon bag is tightly tied to the upper arm, its △ mark should be aligned with the brachial artery; it should be at the same level of the heart, the lower edge of the bag should be 2 to 3 cm above the elbow fossa, and the cuff should not be too tight to fit 2 fingers. During the measurement, there should be no movement, otherwise the pseudo-wave that appears due to muscle movement will make the manometry fail. Measurements are taken 2 to 3 times, with an interval of more than 3 minutes between measurements, and the site and body position should be consistent, and then the average value is taken and recorded.