I. The concept of stroke is equivalent to stroke in Chinese medicine, which refers to the functional or structural damage to brain tissue caused by obstruction or rupture of cerebral blood vessels, and can be broadly divided into two categories: ischemic stroke and hemorrhagic stroke, which generally refers to ischemia or hemorrhage of cerebral arteries. Ischemic strokes account for 60-70 of all stroke patients and include cerebral thrombosis, cerebral embolism, and transient ischemic attack. Cerebral thrombosis is caused by a narrowing of the artery due to atherosclerosis, and when the atheromatous plaque breaks down, a thrombus gradually forms in the lumen and eventually blocks the artery. In some patients, the cerebral vessels are not completely blocked, but are only temporarily ischemic, with signs and symptoms lasting from a few seconds to a few hours, up to 24 hours, called transient ischemic attack, commonly known as mini-stroke or mini-stroke, or TIA. The proportion of hemorrhagic stroke in stroke is 30-40, and it is divided into cerebral hemorrhage and subarachnoid hemorrhage depending on the site of hemorrhage. According to the statistics of the Chinese Ministry of Health in 2005, the annual incidence of stroke in China is 185-219/100,000 people, and there are 2 million new strokes each year, 2/3 of which are fatal or disabling. There is even a set of figures that graphically illustrate the situation of stroke in China. Every 12 seconds a Chinese person has a stroke, and every 21 seconds a Chinese person dies of stroke, and the annual cost of stroke treatment is about 26.3 billion RMB, and it is estimated that the indirect cost is nearly 200 billion RMB. The relationship between hypertension and stroke Hypertension is the most important risk factor for stroke, according to statistics, 70-80 stroke patients have hypertension. Hypertension can promote the occurrence and development of cerebral atherosclerosis. In atherosclerosis, wall thickening, luminal narrowing or plaque rupture secondary to thrombosis, and thrombus dislodgement in some large arteries can cause cerebral artery embolism, which can lead to cerebral blood supply deficiency or cerebral infarction. In addition, under the long-term effect of hypertension, the small cerebral arteries are persistently contracted, which can lead to hardened and brittle vessel walls, and the long-term impact of high-pressure blood flow can cause wall expansion and thinning, especially at the bifurcation, leading to cerebral hemorrhage. Studies have found that for every 3 mmHg average decrease in diastolic blood pressure in hypertensive patients, the risk of stroke will decrease by 32%, and practice in various countries has confirmed the effectiveness of population interventions for hypertension. Finland, the United States, Australia, New Zealand, Western Europe and other countries have successfully carried out population interventions for hypertension, and the death rate of coronary heart disease in the United States decreased by 35% and the death rate of cerebrovascular disease decreased by 48% in 10 years. In the United States, coronary heart disease mortality fell by 35% and cerebrovascular disease mortality by 48% in 10 years. Therefore, controlling hypertension is an effective primary prevention measure.