Under normal physiological conditions, blood pressure generally shows a “double peak and a valley”, with a clear pattern of diurnal activity. The blood pressure is higher during the day, with obvious bimodal peaks seen in the morning from 6:00 to 8:00 and from 14:00 to 18:00, and the lowest blood pressure at night from 2:00 to 3:00, which is at a low point. This rhythmic change in blood pressure responds to changes in body activity and protects well the structure and function of target organs such as the heart, brain and kidneys. Studies have confirmed that a normal blood pressure rhythm is a good indicator of the severity of hypertension. Four different “spoon” blood pressure According to the circadian rhythm changes, blood pressure can be divided into four types: 1, spoon blood pressure spoon blood pressure (10% ≤ (average daytime blood pressure overnight average blood pressure)/average daytime blood pressure < 20%), seen in healthy people and most patients with primary hypertension. 2, super-spoon type blood pressure super-spoon type blood pressure ((daytime average blood pressure overnight average blood pressure)/daytime average blood pressure ≥ 20%); foreign reports of blood pressure super-spoon type changes in cardiovascular and cerebrovascular events and mortality will increase. 3, non-spoon type blood pressure Non-spoon type blood pressure ((0% ≤ (average daytime blood pressure overnight average blood pressure)/average daytime blood pressure <10%); left ventricular hypertrophy, cardiovascular events, cerebrovascular and renal injury are severe in patients with more spoon type hypertension. Some data reported that the incidence of stroke in young people with non-spoon shaped hypertension is significantly greater than spoon shaped. 4. Inverse spoon type blood pressure Inverse spoon type blood pressure ((average daytime blood pressure overnight average blood pressure)/average daytime blood pressure <0%). Some studies have shown that counter-spoon type blood pressure is one of the common blood pressure patterns in Chinese patients with kidney disease, and renal function is more significantly impaired in counter-spoon type blood pressure patients. Blood pressure rhythm changes have a large impact Studies have shown that abnormal circadian rhythm of blood pressure may be closely related to genetics, advanced age, gender, smoking, diet, left ventricular hypertrophy, etc. It is also associated with reduced nocturnal norepinephrine drop, diurnal low and nocturnal high melatonin secretion, insulin resistance, and sleep apnea. Changes in blood pressure rhythm, regardless of size, have an impact on the body's regulatory mechanisms, which can cause damage to various organs. It is an important risk factor and predictor of stroke, myocardial infarction, coronary artery disease, left ventricular hypertrophy, left heart dysfunction, carotid atheroma, cardiovascular cause of death and all-cause mortality. Therefore ambulatory blood pressure monitoring still has its own irreplaceable place in the stereoscopic measurement of blood pressure. The role of ambulatory blood pressure Ambulatory blood pressure can measure blood pressure during both light and moderate physical activity, as well as during sleep, thus providing a more accurate and comprehensive picture of a person's overall blood pressure. It is also possible to understand the trend of blood pressure changes, including the fall of blood pressure at night; the rise of blood pressure in the morning; and the overall variation of blood pressure during a day and night. Therefore, the Chinese Expert Consensus on the Clinical Application of Ambulatory Blood Pressure Monitoring believes that ambulatory blood pressure monitoring has become an indispensable test for the management of hypertension, for the identification and diagnosis of hypertension; for the assessment of cardiovascular risk; and for the assessment of the effectiveness of antihypertensive treatment. Dynamic blood pressure monitoring needs to be noted 1, the person monitoring blood pressure should wear loose, comfortable outerwear, not too tight. 2, after wearing the monitor can be normal life, but be careful not to collide, squeeze, moisture record box, do not enter the magnetic field environment, do not contact with magnetic objects. 3.During the automatic measurement process, the upper limbs should be kept still and stretched, and try to maintain a flat position during sleep. Avoid strenuous exercise. 4.Do not relax or move the cuff freely during measurement to prevent it from loosening or slipping off. The pressure tube should also avoid being folded, compressed, twisted or stretched.