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由于交感神经兴奋而心跳加速。使心肌耗氧量增加,但粥样硬化严重的冠状动脉不能相应扩张以增加供血量,致耗氧与供氧之间的平衡破坏,是诱发心绞痛的原因。现在对于经典的抗心绞痛药物硝酸甘油的作用机理的解释亦与过去完全不同,以往认为的单纯扩张冠状动脉作用,已经为由于扩张全身血管,以致静脉回心血量减少而减轻心脏工作负担的原理所代替。为了恢复心肌供氧与耗氧之间的平衡,除了减少回心血量以减轻心脏工作负担而
As the sympathetic excited and rapid heartbeat. So that myocardial oxygen consumption increased, but severe coronary atherosclerosis can not be expanded to increase the amount of blood supply, resulting in the balance between oxygen consumption and oxygen damage is the cause of angina pectoris. Now for the classic explanation of the mechanism of action of anti-anginal drugs nitroglycerin is completely different with the past, in the past that the simple expansion of coronary artery function, has been due to the expansion of the whole blood vessels, resulting in reduced blood flow to the heart to reduce the workload of the heart work principle instead. In order to restore the balance between myocardial oxygen supply and oxygen consumption, in addition to reducing the amount of blood back to relieve heart work load