Ventricular-- triggered pacemaker arrhythmias.

Ventricular-- triggered pacemaker arrhythmias.

There have been few published reports dealing with the electrocardiographic changes produced by ventricular-This contrasts with the more extensive information with atrial-triggered units. Since the former are apparently being used with increasing frequency, it seemed of interest to present the fundamental electrophysiological characteristics of those pacemakers which are synchronized to the ven...

Ventricular fibrillation triggered by a pacemaker-mediated tachycardia protection algorithm.

A 27-year-old man with complex congenital heart disease (double discordance and complete congenital atrioventricular block) previously implanted with a single-chamber pacemaker was successfully resuscitated from sudden death due to ventricular fibrillation (VF). Echocardiography showed a moderately dilated right systemic ventricle with systolic dysfunction (right ventricular ejection fraction 3...

Ventricular Arrhythmias.

Ventricular tachycardia (VT) is the most common form of wide complex tachycardia and is associated with a high mortality rate. Electrocardiographic analysis remains paramount in diagnosis and helps to direct therapy. Antiarrhythmic agents, although effective in reducing arrhythmia burden, have never demonstrated a mortality benefit. The implantable cardioverter-defibrillator aids not only in th...

Mechanisms of Ca–Triggered Arrhythmias

Interpretation of complex demand pacemaker arrhythmias.

Accurate knowledge ofpacemaker specifications provides the key to the understanding of complex demand pacemaker arrhythmias. This communication describes two examples of complex pacemaker arrhythmias related to the sensing mechanism of normally functioning Medtronic demand pulse generators. Oversensing of atrial voltage generated by an atrial parasystolic focus produced the first arrhythmia. Th...