The winter is coming, and the cold wave is increasing. At this time, it is necessary to guard against the ‘devil time’ of the onset of cardiovascular and cerebrovascular diseases, and take precautions to prevent accidents.
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| "Devil Time" for heart and cerebrovascular disease in winter |
Under normal circumstances, people have lower blood pressure during sleep at night, which is about 2 or 3 in the morning. Wake up in the morning and the blood pressure rises rapidly. In the first few hours after starting the daily activities after morning waking (about 6-10 in the morning), the blood pressure reaches or approaches the highest peak. At this time, the blood pressure is even higher than 40-50mmHg than nighttime, which is medically called "blood pressure morning peak". The blood pressure of some hypertensive patients will suddenly rise in the early morning, and the time is mainly concentrated at 6-10 o'clock in the morning. About half of the elderly hypertensive patients show early morning hypertension. The study found that during the dangerous time in the early morning, the patient's sympathetic nerve was in a period of increased excitability, the renin-angiotensin system was activated, causing the heartbeat to accelerate, and the blood pressure to rise. In addition, the patient did not drink water overnight, and the patient exhaled a lot of water. In the morning, the blood viscosity is high. For hypertensive patients with atherosclerotic plaque, the plaque is prone to rupture, leading to myocardial infarction, cerebral infarction, cerebral hemorrhage, and even sudden death. Studies have shown that the incidence of myocardial infarction at 9 am is 3 times higher than 9:00; the peak of sudden cardiac death is also from 9 am to 12 am; the incidence of stroke in the morning is about 60%. 60% of the elderly died in the early morning, and cardiovascular diseases burst 70% to 80%. Therefore, this period is known as the "devil time" of patients with cardiovascular and cerebrovascular diseases. This is because the patient wakes up, after the start of the activity, the sympathetic nerve is active, the secretion of vasoactive substances such as catecholamine, serotonin and adrenaline is increased, and the vascular tone is increased, so that the blood pressure is increased beyond the normal limit. Low temperature is one of the main causes of the onset of cardiovascular and cerebrovascular diseases. More than 70% of patients with myocardial infarction and more than 50% of patients with coronary heart disease are very sensitive to changes in temperature. The unusually cold weather in the early morning of winter will stimulate the sympathetic nerves, strengthen the blood vessels, cause blood pressure fluctuations, and thus provoke a sudden onset of cardiovascular and cerebrovascular diseases. Moreover, too low temperatures can cause coronary and cerebral arterial vasospasm, leading to coronary heart disease and stroke. In the cold winter season, especially when the cold current invades, the risk of cardiovascular and cerebrovascular events is increased. In particular, be vigilant and pay attention to prevention.