Ventricular Tachycardia in a Patient with Biventricular Noncompaction.

Patients with ventricular noncompaction are susceptible to developing ventricular tachycardia. Commonly, the origin of ventricular tachycardia is endocardial; however, epicardial origins and scar cannot be excluded and should be considered when poor endocardial mapping is present. Other cardiomyopathies, such as arrhythmogenic right ventricular cardiomyopathy, can coexist with ventricular noncompaction and should be excluded in these patients.

Antidromic Atrioventricular Reciprocating Tachycardia Using a Concealed Retrograde Conducting Left Lateral Accessory Pathway.

Atrioventricular reciprocating tachycardia is a common cause of undifferentiated supraventricular tachycardia. In patients with manifest or concealed accessory pathways, it is imperative to assess for the presence of other accessory pathways. Multiple accessory pathways are present in 4% to 10% of patients and are more common in patients with structural heart disease.

Generator exchange in a primary prevention cardiac resynchronziation responder: do you reimplant a defibrillator?

This case-based review discusses the benefits of cardiac resynchronization therapy (CRT) and whether defibrillation function is necessary in CRT responders. An evaluation of the literature and evidence to date is discussed. Recommendations based on these data, expert opinion, and recently published appropriate use criteria are given.

Ventricular ectopy and QTc-interval prolongation associated with dronedarone therapy.

Amiodarone is an effective treatment for atrial and ventricular arrhythmias, but its use is limited by a toxic adverse-effect profile. Although dronedarone has been touted as an antiarrhythmic agent devoid of both solid organ toxicity and proarrhythmic properties, its potential for prolonging ventricular repolarization may augment triggered ectopy. We describe a 66-year-old man who began dronedarone 400 mg twice/day for new-onset paroxysmal atrial fibrillation; he had no left ventricular dysfunction or clinical heart failure.