Recurrent Ventricular Tachycardia This chapter will be divided into discrete sections: (a) definitions; (b) pathophysiologic substrates and mechanisms of tachycardias; and (c) electrophysiologic studies (EPS)—modes of initiation, response to stimulation,…
Catheter and Surgical Ablation in the Therapy of Arrhythmias Experience over the last decade has demonstrated that pharmacologic therapy for the management of paroxysmal ventricular and supraventricular arrhythmias may not…
Preexcitation Syndromes Preexcitation exists when, in relation to atrial events, all or some part of the ventricular muscle is activated by the atrial impulse sooner than would be expected if…
Supraventricular Tachycardias The development and refinement of the techniques of intracardiac recording and programmed stimulation, and our ability to compare these findings with experimental models, have resulted in a greater…
Evaluation of Antiarrhythmic Agents The application of recording and stimulation techniques has made it possible to evaluate the electrophysiologic effects and preferential sites of action of the entire spectrum of…
Atrial Flutter and Fibrillation Atrial fibrillation and its cousin, atrial flutter (typical and atypical), are the most common arrhythmias with which we must deal clinically, yet they are the group…
Intraventricular Conduction Disturbances Intraventricular conduction disturbances are the result of abnormal activation of the ventricles. Normal ventricular activation requires the synchronized participation of the distal components of the atrioventricular (A-V)…
Ectopic Rhythms and Premature Depolarizations Ectopic depolarizations can arise from many areas of the heart, but the surface ECG is markedly limited in its ability to precisely define the origin…
Atrioventricular Conduction The usefulness of intracardiac recording and stimulation techniques in humans was first realized during its application to patients with disorders of atrioventricular (A-V) conduction. Electrophysiologic study allowed confirmation…
Miscellaneous Phenomena Related to Atrioventricular Conduction Concealed conduction, the gap phenomenon, and supernormality are physiologic events that may be considered to be variants of the normal response. These phenomena are…
