A 75-year-old man underwent an electrophysiologic procedure because of recurrent palpitations and documented tachycardia. At baseline, there was sinus rhythm with right bundle branch block. Programmed stimulation demonstrated anterograde dual AV nodal physiology. A regular, long RP tachycardia with a cycle length of 540 msec and inverted P waves in the inferior leads was induced by atrial overd...

A 34-year-old woman with a long history of paroxysmal supraventricular tachycardia underwent an electrophysiologic procedure. The baseline sinus cycle length, atrial-His (AH), and His-ventricular (HV) intervals were 720, 70, and 50 msec, respectively. A narrow-QRS complex tachycardia was induced by ventricular pacing at a cycle length of 380 msec (Fig. 1). The tachycardia cycle length was 400 m...

Mapping-guided endocardial resection has proved to be an effective therapy for recurrent sustained ventricular tachycardia. However, some patients cannot be mapped during ventricular tachycardia, so that guidance from findings during normal sinus rhythm would be highly desirable. We examined the frequency, timing, and duration of several abnormal types of electrograms recorded endocardially dur...

INTRODUCTION The purpose of this study was to perform a quantitative fluoroscopic analysis of the coronary sinus ostium and its relationship to the His bundle in patients with and without AV nodal reentrant tachycardia. Sites of slow pathway ablation are often near the coronary sinus ostium, which can be located within a few millimeters of the His bundle. Whether such close proximity of the cor...

INTRODUCTION Studies in Europe and America showed that tachycardia, less often bradycardia, frequently accompanied partial seizures in Caucasian patients. We determine frequency, magnitude and type of ictal heart rate changes during partial seizures in non-Caucasian patients in Singapore. METHODS Partial seizures recorded during routine EEGs performed in a tertiary hospital between 1995 and 1...

OBJECTIVES To evaluate the efficacy of flecainide and digoxin combination in foetal supraventricular tachycardia. SETTING This study was carried out in a tertiary referral centre. METHODS We conducted a retrospective review of 29 patients diagnosed with supraventricular foetal tachycardia between 2001 and 2009. Mode of presentation, foetal cardiac function, maternal anti-arrhythmic serum le...

Adenosine was administered intravenously to 17 patients undergoing intracardiac electrophysiologic studies. At a mean dose of 179 +/- 88 micrograms/kg (+/- SD), adenosine suppressed sinus node automaticity and depressed atrioventricular (AV) nodal conduction. These effects were less than 20 sec in duration and were not influenced by muscarinic blockade with atropine (0.02 to 0.03 mg/kg). Adenos...

A 58-year-old man with hypertension and diabetes with recurrent persistent symptomatic atrial fibrillation resistant to sotalol-facilitated cardioversions was referred for ablation. Catheter-based radiofrequency ablation for persistent atrial fibrillation was performed, which consisted of isolation of all 4 pulmonic veins; linear ablations along the left atrial roof; an ablation line from the l...