With the progress of science and technology, “electronic sphygmomanometer” is gaining more and more attention, and has entered the hospital and family. But often hear people ask: “electronic blood pressure monitor several times in a row the results of measurement is not the same”, “electronic blood pressure monitor and mercury column sphygmomanometer measurement results are different, electronic blood pressure monitor is accurate? ” To answer this question, first discuss the following issues. First, about “blood pressure” and “sphygmomanometer” “blood pressure” refers to the blood pressure on the blood vessel wall when the blood flows in the blood vessel. In a cardiac cycle, there is a corresponding “systolic pressure” (commonly known as “high pressure”) and “diastolic pressure” (commonly known as “low pressure”). “). Internationally, blood pressure is usually measured by the auscultatory method (Koch’s sound method) or the invasive method (cardiac catheterization method), and the indirect measurement of blood pressure by auscultation is used as the “reference standard”, while the invasive method is used as the “gold standard”. In 1905, the Russian scientist Korotkov discovered that the pulsating sound produced by the blood flow in the arteries hitting the walls of the blood vessels could be heard on the surface of the body – in his honor, this sound was called “Korotko’s sound”. The term “blood pressure” used in medical examinations and general health monitoring usually refers to the arterial pressure measured at the brachial artery in the upper arm. The apparatus used to measure blood pressure is called a “sphygmomanometer”. There are three types of sphygmomanometers: mercury column sphygmomanometers, barometer sphygmomanometers, and electronic sphygmomanometers. Now often recommended to use the mercury column sphygmomanometer and electronic sphygmomanometer. Second, the type of electronic sphygmomanometer Currently commercially available electronic sphygmomanometer has a semi-automatic type and automatic type, manually inflated for the semi-automatic type, do not need to manually inflate the fully automatic type. According to the cuff inflatable pressure parts, divided into upper arm type, wrist type and finger sleeve type. The upper arm type electronic sphygmomanometer is more reliable and recommended for use. The wrist type is lower than the heart level, and the finger cuff type is obviously affected by the arterial elastic echo, resulting in less accurate blood pressure measurement, and the difference between the blood pressure measurement value of the wrist and finger and the upper arm is large (10mmHg), which is not suitable for patients suffering from hypertension, diabetes, hyperlipidemia and other atherosclerosis or peripheral circulation disorders. In a strict sense, the so-called “finger-jacket sphygmomanometer” can only be called “finger-end pulse manometer”, “wrist-type electronic sphygmomanometer” is called “wrist Arterial pulse manometer”, so the latter two are not recommended. Whether at home or abroad, the “electronic sphygmomanometer” that has entered the medical and health care field and is recognized by the medical profession is measured at the brachial artery of the upper arm using the cuff method. According to the British Hypertension Society (BHS) recommended instrumentation rating standards, A grade is 80% of the measured value.