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与室性心动过速相比,室上性心动过速常被视为良性的心律失常。在心脏代偿功能良好时,它通常能自行中止或仅产生轻度血液动力学变化。但在有心肌疾病或重度瓣膜梗阻时,此种心律失常能威胁生命。甚至在正常心脏,如果室上性心动过速持续时间长,对标准治疗方法无效,亦可有害。最近,实验研究和临床观察增进了人们对室上性心动过速的起始、持续、及终止的机理的认识;而且亦了解了使治疗无效的各种因素。
Compared with ventricular tachycardia, supraventricular tachycardia is often considered as a benign arrhythmia. When the heart compensates well, it usually stops spontaneously or produces only mild haemodynamic changes. However, in cases of myocardial disease or severe valvular obstruction, such arrhythmias can be life-threatening. Even in the normal heart, if the duration of supraventricular tachycardia is long, the standard treatment is not effective and can be harmful. Recently, experimental studies and clinical observations have led to increased awareness of the mechanism of onset, persistence, and termination of supraventricular tachycardia; and have also learned about the various factors that invalidate treatment.