Electrophysiologic study was performed in a 52-year-old man with type A ventricular preexcitation. An accessory atrioventricular pathway with no ventriculoatrial conduction was localized to the posteroseptal region. "Fatigue phenomenon," defined as suppression of atrioventricular conduction following rapid pacing, was observed to be provoked by atrial pacing in a rate- and duration-dependent ma...

45 years age female presented with acute onset palpitation. On examination she had tachycardia and a blood pressure of 116/70. ECG was suggestive of NCT (Fig. 1). On administration of 6 mg of intravenous adenosine she developed transient AV block followed by irregular wide complex tachycardia (Fig. 2) and systemic hypotension, requiring DC cardioversion. Electrocardiogram in sinus rhythm showed...

Permanent junctional reciprocating tachycardia (PJRT) patients are resistant to drug therapy and are at risk of cardiomyopathy. The electrocardiogram shows negative P waves in leads II, III, aVF and V3 –V6 and RP interval is longer than PR interval during tachycardia. This report describes a 15 years old female child with PJRT and tachycardia induced cardiomyopathy treated successfully with rad...

Supraventricular tachycardia (SVT), the most common sustained symptomatic arrhythmia of childhood, is often supported by a manifest or concealed accessory pathway. Permanent interruption of the accessory pathway usually requires surgical division. Recent experience with electrical ablation of posterior septal pathways in adults prompted us to apply the technique to children. Six children, ages ...

Filtered bipolar right ventricular apical (RVA) and His bundle electrograms, using electrodes only i mm apart, were recorded in two patients with intermittent WPW type A with and without 'complete' right bundle-branch block. In beats with exclusive normal pathway conduction and 'complete' right bundle-branch block, the HV and V-RVA intervals represented His-to-left ventricular endocardial and l...

Cryothermia, a new technique for definitive treatment of the pre-excitation syndrome, is described in two patients. The first patient presented with a normal P-R interval with a delta wave and reciprocating tachycardia. Preoperative electrophysiologic study suggested a free-wall atrioventricular connection on the left posterior atrioventricular (A-V) groove. At surgery, epicardial mapping confi...