A 60-year-old male with a history of prior ablation of typical cavotricuspid isthmus-dependent atrial flutter presented to us with recurrent palpitations. The surface 12-lead EKG was consistent with atrial tachycardia, for which an ablation was planned. The patient was found to have multiple marcroreentrant left atrial tachycardias utilizing areas of scar as substrate. Isthmuses of tissue with ...

OBJECTIVES To clarify the prevalence and mechanism of supraventricular tachycardia in patients with right atrial isomerism. BACKGROUND Paired SA and dual atrioventricular (AV) nodes have been described in patients with right atrial isomerism. However, the clinical significance remains unclear. METHODS From 1987 to 1996, a total of 101 patients (61 male, 40 female) and four fetuses were iden...

Background. Ectopic atrial tachycardia (EAT) is a reversible cause of cardiomyopathy but may be quite difficult to control with conventional therapy. Transcatheter ablation with radiofrequency current was tested as an alternative to medical or surgical treatment of this condition. Methods and Results. Twelve young patients (aged 10 months to 19 years) with drug-resistant EAT were treated with d...

Atrial dissociation is characterized by two sets of independent P waves on the electrocardiogram and two atrial beats independent of each other. One atrium is under the control of the dominant pacemaker (sinus node) which also controls the ventricles, while the other atrium or part of the other atrium is under the control ofan ectopic pacemaker, resulting in unilateral ectopic atrial rhythm, be...

In 20 anesthetized open-chest dogs, epicardial electrograms were recorded from ischemic and nonischemic zones of the left ventricle during acute occlusion of the left anterior descending artery. The average time to onset of ventricular tachycardia during atrial pacing (150-200 beats/min) was 4 min, 18 sec. In 18 dogs, ventricular ectopic beats were induced in normal and ischemic zones after eve...

Background. Ectopic atrial tachycardia (EAT) is a reversible cause of cardiomyopathy but may be quite difficult to control with conventional therapy. Transcatheter ablation with radiofrequency current was tested as an alternative to medical or surgical treatment of this condition. Methods and Results. Twelve young patients (aged 10 months to 19 years) with drug-resistant EAT were treated with d...

BACKGROUND Ectopic atrial tachycardia (EAT) is a reversible cause of cardiomyopathy but may be quite difficult to control with conventional therapy. Transcatheter ablation with radiofrequency current was tested as an alternative to medical or surgical treatment of this condition. METHODS AND RESULTS Twelve young patients (aged 10 months to 19 years) with drug-resistant EAT were treated with d...