Nervous system and hypertension

 There is a lot of evidence that hyperactivity of sympathetic nervous system is the main factor in the formation and maintenance of hypertension. The increase of sympathetic activity increased the levels of renin and noradrenaline in these patients, and the stress response of blood vessels increased, which led to the enhancement of myocardial contractility, acceleration of heart rate, increase of blood volume of the heart, and contraction and spasm of peripheral resistance arterioles, which led to the increase of blood pressure. The patients with essential hypertension have excessive pressure-up and hypotension reactions in stress and relaxation. The degree of blood pressure drop in meditation or other relaxing state of the body, and the increase of blood pressure during mental calculation or emotional excitement are higher than that of normal people. These phenomena verify why the patients with hypertension often have tragedy on mahjong table and why the patients with hypertension are more grumpy than normal people. A large population survey found that the incidence rate of hypertension in city was significantly higher than that in rural area. During the World Cup football match, the rate of visiting patients with hypertension was significantly higher than usual, indicating that adverse environmental factors and stress reactions could also raise blood pressure. Stress plays a role in the sympathetic nervous system. Some antihypertensive drugs achieve the goal of reducing blood pressure by inhibiting the stimulation of sympathetic nervous system.