Relative Timing of Isolated Potentials During Postinfarction Ventricular Tachycardia and Sinus Rhythm

Isolated potentials during sinus rhythm and pace-mapping within scars as guides for ablation of post-infarction ventricular tachycardia.

OBJECTIVES The purpose of this study was to identify ventricular tachycardia (VT) isthmus sites by pace-mapping within scar tissue and to identify electrogram characteristics that are helpful in identifying VT isthmus sites during sinus rhythm (SR). BACKGROUND Pace-mapping has been used in the scar border zone to identify the exit site of post-infarction VT. METHODS In 19 consecutive patien...

Sinus rhythm targeting of channels for ablation of postinfarction ventricular tachycardia.

Ablation for ventricular tachycardia during stable sinus rhythm.

Implantable cardioverter defibrillators (ICDs) can effectively terminate ventricular tachycardia (VT) when it occurs, but they do not prevent initiation of VT. There are several reasons why prevention of episodes is desirable. When VT is promptly and painlessly terminated by antitachycardia pacing, it can be asymptomatic. However, patients describe defibrillator shocks as terrible events that e...

Endocardial late potentials during sinus rhythm define the re-entry circuit of ventricular tachycardia in arrhythmogenic right ventricular cardiomyopathy.

Arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) is an inherited cardiomyopathy characterized by progressive fibro-fatty replacement of the right ventricular myocardium. We report a case where mapping of endocardial potentials during sinus rhythm identified the re-entry circuit of a recurrent ventricular tachycardia in a patient with ARVC. The tachycardia was subsequently abla...

Determinants of postinfarction ventricular tachycardia.

BACKGROUND Structural factors contributing to the development of postinfarction ventricular tachycardia (VT) are unclear. The purpose of this study was to analyze infarct architecture and electrogram characteristics in patients with and without inducible VT and to identify correlates of postinfarction VT. METHODS AND RESULTS Twenty-four postinfarction patients (median age, 64 [53, 70] years) ...