A further mechanism of escape-capture bigeminy is described, viz, blocked atrial extrasystoles.

A total of 135 consecutive pediatric patients (pts) with tachyarrhythmia ranging from two to 21 years of age (median age 11 years) underwent electrophysiological study (EPS) between January 1994 and July 2001. Tachycardia could not be induced in 38 of 135 pts (28%) and studies in these patients were accepted as the normal EPS. Supraventricular tachyarrhythmia mechanisms were atrioventricular (A...

Junctional ectopic tachycardia has been described in infants but not in adults. Five adults with rapid symptomatic paroxysmal junctional tachycardia, distinct from the more common slower nonparoxysmal junctional tachycardia, were recently evaluated. The tachycardia was irregular (rate 120 to 250) and accompanied by periods of atrioventricular dissociation and narrow QRS complexes. A junctional ...

We describe a patient presenting with incessant ectopic atrial tachycardia during a high risk twin pregnancy. Tachycardia was resistant to escalating doses of beta-blockade with digoxin. Because of increasing left ventricular dysfunction early in the third trimester, catheter ablation was performed successfully at 30 weeks gestation. Electro-anatomic mapping permitted the entire procedure to be...

Jaeggi and colleagues1 have added to the literature with their extensive assessment of 159 fetal tachyarrhythmia cases collected from 3 institutions over a 10-year period. However, before we comment on their study, it is worth reviewing some of the relevant issues for management of fetal arrhythmias. An estimated 0.4% to 0.6% of pregnancies have a fetal arrhythmia at some point during the pregn...

INTRODUCTION The purpose of this prospective study was to determine the prevalence and clinical significance of inducible atrial tachycardia in patients undergoing slow pathway ablation for AV nodal reentrant tachycardia who did not have clinically documented episodes of atrial tachycardia. METHODS AND RESULTS Twenty-seven (15%) of 176 consecutive patients who underwent slow pathway ablation ...

In one patient reprodncibk episodes of sMal tachyear(200 msec, control; 70 msec, atropine) and sustained dia conld be elicited via programmed atrial premature atrial tachycardia no longer could be elicited. These dcpoluizations. Evllodion of the elechpphysiologic studies mpport the concept that h a t t i a l reciprocation shldks suggested that the most tikely mechanism was can be a mechanism re...

Reports on arrhythmias in cystic fibrosis (CF) patients are limited. Four CF patients treated at our center had recurrent supraventricular tachycardia (SVT). Three had cor pulmonale, as evidenced by echocardiogram, and all had baseline tachycardia. Twenty-four hour Holter monitoring in three patients showed ectopic atrial pacing and premature atrial and ventricular contractions in one patient, ...

BACKGROUND Intravenous amiodarone and procainamide are both used as therapies for refractory supraventricular tachycardia (SVT). However, no studies have compared the efficacy and safety of these agents in pediatric patients. METHODS AND RESULTS All patients treated with intravenous amiodarone or procainamide during 25 consecutive months for the following mechanisms of SVT were included: orth...