Ischemic etiology for adenosine-sensitive fascicular tachycardia.

Adenosine-responsive ventricular tachycardias (VTs) typically occur in patients without structural heart disease; and thus, its association with myocardial ischemia is rare. In this case report, we describe a patient who had demonstrable ischemia along the anterolateral wall of the left ventricle and who developed a VT that was clinically terminated with adenosine. Surface electrocardiogram demonstrated a monomorphic VT with a right bundle-branch block morphology and a rightward axis configuration, and electrophysiologic testing showed atrioventricular dissociation upon atrial pacing and retrograde His waves following induction of VT.

Anger-induced T-wave alternans predicts future ventricular arrhythmias in patients with implantable cardioverter-defibrillators.

Objectives: This study sought to determine whether T-wave alternans (TWA) induced by anger in a laboratory setting predicts future ventricular arrhythmias in patients with implantable cardioverter-defibrillators (ICDs).

Background: Anger can precipitate spontaneous ventricular tachycardia/ventricular fibrillation and induce TWA. Whether anger-induced TWA predicts future arrhythmias is unknown.

Implantable cardioverter-defibrillator shocks increase T-wave alternans.

Introduction: While implantable defibrillator shocks save lives, shock can lead to ventricular arrhythmias. However, the mechanism of shock-related proarrhythmia remains unclear. We evaluated the impact of ICD shock on repolarization instability, a factor associated with ventricular arrhythmogenesis.

Electrophysiologic characteristics of anger-triggered arrhythmias.

Background: Anger can precipitate ventricular arrhythmias in patients with implantable cardioverter-defibrillators (ICDs). Determining electrophysiologic characteristics of anger-triggered arrhythmias may help elucidate the mechanisms that link emotion and arrhythmia.

Objectives: We sought to compare the morphology and initiation pattern between ventricular arrhythmias that are triggered by anger and those that are not.