A 41-year-old male was presented with drug-resistant supraventricular tachycardia. Electrophysiological study confirmed that the supraventricular tachycardia was caused by dual atrioventricular nodal pathways and a left lateral accessory pathway (AP). The left lateral AP was resistant to traditional endocardial ablation, but was successfully eliminated by radiofrequency ablation via the intraco...

Introduction Atrioventricular nodal reentrant tachycardia (AVNRT) is the second most frequent form of paroxysmal narrow complex tachycardia in the pediatric population. A conservative approach is used for ablation in children because of anatomical limitations and risks related to a permanent pacemaker in the case of atrioventricular nodal conduction damage. Cryoablation has emerged in the first...

A case presenting with AV nodal escape rhythms after obvious sinus depression is described. The escape rhythms arise from two dissociated AV nodal pacemakers with differential physiological properties. Variation in the rate of the upper AV nodal pacemaker results in a form of escape-capture bigeminy. Temporary acceleration of the sinus rhythm results in dissociation between sinus and lower AV n...

We present an interesting image showing sequential loss of anterograde, and subsequently, retrograde conduction during radiofrequency ablation of an accessory pathway. We discuss the possible mechanisms and prior literature concerning this interesting finding.

We present the case of a 25 year-old man referred for an electrophysiological study due to suspected pre-excitation as the cause of two recent syncopal episodes. The admission electrocardiogram (ECG) showed a borderline PR interval of 120 ms and apparently small delta waves visible in leads V2-V4. Intracardiac recordings showed a short HV interval of 18 ms that was stable despite decremental at...

An 18-year-old man whose sister has classic Kartagener's syndrome was found to have sinusitis, bronchiectasis, and corrected transposition with normal visceral situs. Congenital complete heart block was secondary to absence of conducting-system pathways between a small posterior atrioventricular node and the transposed His bundle and bundle branches. No anterior atrioventricular node was presen...

Electrophysiologic delineation of the atrioventricular conduction system at surgery is described in two patients with corrected transposition of the great arteries in situs inversus. Intra-atrial electrograms were recorded in one patient from sites immediately adjacent to the coronary sinus located in the left-sided right atrium. The intraventricular portion of the atrioventricular conduction s...

BACKGROUND Most non-chromosomal congenital heart defects are thought to be caused by the interaction of genetic factors involving multiple genes and environmental factors. Families that have several affected members have been reported, however, which suggests that a single autosomal dominant or recessive gene may cause the cardiac defects. A family in which atrioventricular septal defect seemed...

19. Kittle CF, Santos EM, Dimond EG: Persistent right bundle branch block due to pulmonic valvotomy and infundibulectomy. Ann Surg 22: 80, 1956 20. Anderson PAW, Rogers MC, Canent RV, Yarmakani JMM, Jewett PH, Spach MS: Reversible complete heart block following cardiac surgery. Analysis of His bundle electrograms. Circulation 46: 514, 1972 21. Moore EN, Boineau JP, Patterson DF: Incomplete righ...

This review is aimed at discussing the diagnostic value of the different electrocardiographic criteria so far described in the differential diagnosis of the major forms of paroxysmal supraventricular tachycardias (PSVTs). The predictive value of different combinations of these independent electrocardiographic (ECG) signs in distinguishing atrioventricular reentrant tachycardias (AVRTs) through ...