The standardized name of the electronic blood pressure device should be electronic sphygmomanometer, electronic sphygmomanometer measurement of both arms can be, there is no which arm quasi-statement, the record should be biased on the side of the high shall prevail, but the difference between the two upper limbs of the blood pressure of more than 20mmHg, should be recorded separately. Electronic sphygmomanometers measure blood pressure by feeling the strength of the brachial artery beat. The left brachial artery originates from the left subclavian artery, whereas the right brachial artery originates from the trunk of the head and arm. There is more blood in the cephalic trunk than in the left subclavian artery, so blood pressure is generally higher in the right arm than in the left arm. When measuring blood pressure, the blood pressure on the higher side should prevail. Aortic coarctation, subclavian artery stenosis or occlusion, aortitis and other reasons can occur in the two upper limbs of the blood pressure difference of more than 20mmHg. In this case, both sides of the blood pressure should be recorded at the same time, and further examination should be carried out in a timely manner to clarify the cause of the disease, and the treatment should be determined after evaluation by the doctor. When using electronic sphygmomanometers to measure blood pressure abnormalities or large differences in blood pressure between the two upper extremities, you should promptly consult a doctor and improve the examination, and follow the doctor’s instructions for treatment to avoid delays in the condition.