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近年来由于心内希氏束电图、程序电刺激、心内膜与心外膜标测等技术的进展,对小儿心源性心律不齐的发生机理及治疗有更多的了解。一些研究表明,阵发性室上性心动过速(简称PSVT)的形成机理可分为折返激动和自律性增加两大类。折返激动按其发生部位可分为窦性、房性、房室结性和旁道折返性心动过速,以后两者最为多见,约占90%左右。而自律性增加者只占少数。PSVT是小儿常见的快速心律失常,以快速的心房率,通常达200～300次/分,每次搏动均传到心室为特点。初次发病以婴儿期多见,且易复发,但大多数起病时症状不明显,因而早期诊断常不及时。短期发作的PSVT对心脏血流动力学的影响不大,但连续几小时或更长时间的发作,特别是婴儿可发生急性充血性心力衰竭。Garson分析了217例小儿
In recent years, due to intracardial His bundle, procedural electrical stimulation, endocardial and epicardial mapping technology progress, pediatric cardiogenic arrhythmia mechanism and treatment have more understanding. Some studies have shown that the formation mechanism of paroxysmal supraventricular tachycardia (referred to as PSVT) can be divided into reentry and self-discipline to increase the two categories. Reentry excited according to the site of its occurrence can be divided into sinus, atrial, atrioventricular nodal and reentrant tachycardia, the most common after the two, accounting for about 90%. The increase in self-discipline accounted for only a minority. PSVT is a common tachyarrhythmia in children with rapid atrial rate, usually up to 200 to 300 beats / min, each beating heart beats are characterized. Initial incidence of more common in infancy, and easy to relapse, but most of the onset symptoms are not obvious, so often not early diagnosis. Short-term PSVT has little effect on cardiac hemodynamics, but attacks lasting hours or longer, especially in infants, can develop acute congestive heart failure. Garson analyzed 217 children