Hypertension of unknown etiology, morbidity associated with 1 Factors: age incidence has increased with the growth of age trends, 40 years old of above person high incidence.
2 salt: salt intake is high, high incidence of hypertension, has thought that salt <2g/, almost no hypertension; 3-4g/, the incidence of hypertension in 3%, 4-15g/ days, >20g/ days 33.15% incidence, morbidity rate of 30%.
3: the high incidence of weight in obese subjects.
4 genetic: about half of hypertensive patients with family history.
5 the environment and occupation: there is noise in the work environment, excessive tension of mental labor are prone to hypertension, city of hypertension incidence is higher than that of rural areas.
Blood pressure regulation mechanism
Many factors can cause high blood pressure. The heart pumps blood capacity of strengthened ( such as cardiac contractility increases etc.), make every second to pump blood to increase. Another factor is the main artery of loss of normal elastic, become rigid, when the heart pumps blood, can not effectively expansion, therefore, each stroke to pump blood through the narrow space than normal, leading to elevated pressure. This is caused by atherosclerosis hypertension occurred in the arterial wall thickening and becoming stiff older reason. Due to nerve and blood hormone stimulation, systemic arterioles can be temporarily shrinkage also raises blood pressure hypertension. May lead to elevated blood pressure third factors are the circulating liquid capacity increase. This is common in kidney disease, kidney is not fully excreted from the body of salt and water, the body to increase blood volume, leading to increased blood pressure.
Conversely, if the heart pumps blood capacity restriction, vascular dilatation or excessive loss of body fluid, can lead to a drop in blood pressure. These factors mainly through the kidney function and autonomic nervous system ( nervous system automatically regulating body function of many changes to the control part ).
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