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心肌梗死是由于心肌持久严重缺血而引起的部分心肌坏死,绝大多数是在冠状动脉粥样硬化的基础上,合并血栓形成或持续性痉孪。使管腔发生急性阻塞而形成。 当寒潮来临,气温突变时,人体内去甲肾上腺素突然升高,引起心跳加快,心肌耗氧量增加,全身乃至冠状动脉痉孪。有时仅仅是脚底受凉也会因反射性末稍血管收缩引起一过性的冠状动脉痉挛。寒冷还会影响睡眠,造成焦虑,又能使体内儿茶酚胺类血管活性物质升高,导致冠状动脉痉孪而诱发心肌梗死。
Myocardial infarction is due to myocardial persistent severe ischemia caused by part of myocardial necrosis, the vast majority is based on coronary atherosclerosis, thrombosis or persistent spasm. The lumen acute obstruction and the formation. When the cold wave approaching, sudden changes in temperature, the body suddenly increased norepinephrine, causing rapid heartbeat, myocardial oxygen consumption increased, systemic and coronary vasospasm. Sometimes only the soles of the feet will also be due to reflex distal vasoconstriction caused by transient coronary spasm. Cold also affects sleep, causing anxiety, but also make the body of catecholamines increased vasoactive substances, leading to coronary artery spasm and induce myocardial infarction.