Self-measurement blood pressure left arm or right arm

  Self-measurement of blood pressure at home is one of the important measures to prevent and control hypertension. However, many patients feel that the blood pressure measured by themselves is not accurate, and the values ​​of the left arm and the right arm are different. Should the left arm or the right arm be measured?
   In theory, the side closer to the source should have more pressure, just like the faucet closest to the source always has the highest pressure and the fastest water. According to the “water from the tap” theory, the blood pressure measured on the right arm must be higher than that of the left arm. Usually, the blood pressure of the right arm is 5-10 mm Hg higher than that of the left arm. This is because the right brachial artery of the human body comes from the branch of the brachiocephalic trunk, and the left brachial artery comes from the left subclavian artery. Both the brachiocephalic trunk and the left subclavian artery originate from the aorta, while the brachiocephalic trunk is the larger branch of the aorta, the left subclavian artery has a smaller branch, and the blood pressure in the right arm is naturally higher. Therefore, the standard recommendation given by the authoritative “Diagnostics” is to measure the blood pressure of the right arm. The blood pressure standard is also formulated based on the blood pressure results of the right upper arm, and most of the blood pressure measurements are performed on the right upper arm.
   Foreign studies have found that by distinguishing the difference in blood pressure between the left and right arms, it is possible to infer whether a person has cardiovascular health risks. When the difference in blood pressure between the left and right arms, often exceeding 15 mmHg, should be paid special attention, which means that there is a problem with the human blood vessels, which will affect cardiovascular health in the long run, thereby causing cardiovascular and cerebrovascular diseases. It is necessary to go to the hospital to check whether it is caused by other diseases, such as doing a blood vessel ultrasound to check whether there is stenosis of the blood vessels.
   Since the blood pressure of the two arms may be different, the guidelines for hypertension management given by the European Society of Cardiology in 2018 recommend that the blood pressure of both arms should be measured when measuring blood pressure for the first time. The higher side, as the immobilized arm for later measurements.
   It should be reminded that the ultimate goal of blood pressure measurement is to reduce the occurrence of cardiovascular events. Generally speaking, the difference in blood pressure between the left and right arms is not large, and there may be a difference of 5-10 mmHg between the two arms of any healthy person; and even if the same arm is measured 10 times in a row, it will There is a big difference. More importantly than choosing the left and right arms, in order to maintain the stability of the measurement, it is recommended not to drink strong tea, coffee, smoking, drinking, and urinating within 30 minutes before the blood pressure measurement; sit still for 5 minutes before the measurement, and avoid strenuous exercise; Find the right position to avoid the air bag being too tight or too loose; when measuring, the palm of your hand should be relaxed naturally, put the wrist strap of the sphygmomanometer on the storage box or the cushion, and make the position of the wrist strap at the same height as the heart, not too high or too low; In a quiet state, at the same time, measure the same side arm. The blood pressure value obtained in this way has more clinical value.