Weekly First-aid Topic: Watch out for “Devil Time” in Brain Stroke Prevention
From:Beijing Municipal Commission of Health and Family Planning


It is the mid-season of autumn and winter, cerebrovascular diseases ushered in. We should not only be careful of high blood pressure, but also need to watch out the "devil time" of cerebral infarction in prevention of stroke. Many middle-aged and elderly people have the habit of going out for exercises in the early morning. But when the season alternates, it is not advisable to go out for exercise too early. It is because in autumn and winter, indoor and outdoor temperature are vastly different. It is easy to induce vasoconstriction and thrombus while suddenly stepping into the cold environment. Therefore, morning exercises are best be arranged at 10 o'clock in the morning. It is also advisable to exercise at three or four o'clock in the afternoon when the oxygen content in the air is sufficient and more wholesome. In addition, hypertensive patients accustoming to eating antihypertensive drugs in the morning can also take the pills before getting up. Wee hours from 3:00 to 5:00 is the 'devil time' for stroke. Although the majority of people are still asleep during this period, the sympathetic nervous system has begun to be excited and the body's metabolism begins to become more active, which give rise to risks of cerebrovascular accidents. When sleeping at night, the body is relatively ischemic and we have blood viscosity and blood flow velocity, which are also easy to lead to thrombus.