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Objective To illustrate the automatic modulation of refractoriness of His-Purkinje system during atrioventricular nodal reentrant tachycardia (AVNRT) and to discuss the possible mechanisms. Methods Programmed electrical stimulations were performed in high right atrium (HRA) in 8 patients with AVNRT before ablation to induce tachycardia and electrocardiagraphic recordings were done synchronically when AVNRT appeared. Results All the patients had 2∶1 atrioventricular (A-V) conduction when AVNRT began, 2 of whom were blocked below His bundle, 5 above His bundle and 1 unclear. After a duration of 14.03±10.03 s of 2∶1 A-V conduction, 1∶1 A-V conduction with bundle banch block appeared, 3 of which were right bundle branch block (RBBB), 3 left bundle branch block (LBBB), and 2 with both. Bundle branch block disappeared after a duration of 6.87±11.26 s. Conclusion Effective refractory period (ERP) of His-Purkinje system at the beginning of AVNRT was modulated automatically within less than 30-60 s and thus facilitated nodal-ventricular conduction. The mechanism of this is electrical remodeling. 相似文献
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报道3例慢性复发性房室折返性心动过速伴心脏扩大与心功能不全的患者,在用导管消蚀术根治心动过速后,其临床表现、心脏大小与心功能均恢复正常.作者介绍了此类心肌病的临床特点,讨论了发病机制与命名问题,强调识别本病与及时控制心动过速的重要性. 相似文献