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心律失常的种类很多,病因各异,对病人的危害程度亦各不相同。现就临床上对病人影响较大的几种常见的心律失常作一简述: 一、心律失常发生的机理: 心律失常按其发生的原理可归纳为三种情况:①心脏冲动形成的失常;②心脏冲动传导的失常;③心脏冲动形成和传导两者的失常。 (一)心脏冲动形成的失常: 心脏冲动形成的失常可由心肌的自律性和/或兴奋性失常所致。与以下的原理有关: 1.舒张期自动除极速度:舒张期自动除极快,即4相坡度大,升到阈电位触发兴奋所需时间缩短,自律性增高。对心房传导组织,房室束和浦肯野氏纤维系统快反应自律细胞,如能加快Na~+内流或延缓K~+
Many types of arrhythmias, different causes, the extent of the harm to the patient are also different. Now on the clinical impact on patients with several common arrhythmia make a brief: First, the mechanism of arrhythmia: According to the principle of arrhythmia can be summarized into three cases: ① the formation of cardiac impulse disorders; ② heart impulse conduction disorders; ③ heart impulse formation and conduction of both disorders. (A) the formation of heart impulse disorders: cardiac impulse disorders can be caused by myocardial self-discipline and / or excitability disorders. With the following principles: 1. Diastolic automatic depolarization speed: diastolic automatic exceptionally fast, that is, 4-phase gradient, rose to the threshold voltage to trigger the excitement of the time required to shorten, increased self-discipline. Atrial conduction tissue, atrioventricular bundle and Purkinje fiber system rapid response to autonomic cells, such as to speed up Na ~ + influx or delay K ~ +