Hein J.J. Wellens

Variable patterns of septal activation in patients with left bundle branch block and heart failure.

Septal Activation in Patients with LBBB and Heart Failure. Introduction: Little is known about the septal activation pattern in patients with heart failure and left bundle branch block (LBBB‐HF).

Cure of Interfascicular Reentrant Ventricular Tachycardia by Ablation of the Anterior Fascicle of the Left Bundle Branch

Ablation of Interfascicular Reentrant Tachycardia. Introduction: Fascicular reentrant ventricular tachycardia (VT) using the anterior fascicle of the left bundle anterogradely is rare and may produce identical QRS morphology during sinus rhythm and VT. Catheter ablation of this type of VT has not been described in detail.

Automaticity in Mahaim Fibers

Introduction: Automatic rhythms associated with Mahaim fibers usually occur during radiofrequency catheter ablation. The incidence and significance of spontaneous automaticity in Mahaim fibers are unknown.

Effect of Electrode Length on Atrial Defibrillation Thresholds

Electrode Length for Atrial Defibrillation. Introduction: Catheter‐based electrodes have been used previously to terminate episodes of atrial fibrillation in animals and man. Typically, these electrodes span 6 to 7 cm, and lowest energy requirements are achieved when these electrodes are positioned in the distal coronary sinus and in the right atrium. The purpose of this study was to evaluate the use of longer electrode lengths for atrial defibrillation.

Diagnosis and Therapy of Atrial Tachyarrhythmias in the Dual Chamber Implantable Cardioverter Defibrillator

Atrial Arrhythmias in ICD Patients. Introduction: Devices capable of monitoring and treating atrial taihyarrhythmias provide information about the natural history of the arrbythmias and potentially can influence their natural course by electrical therapy early after onset.

Short Atrioventricular Mahaim Fibers: Observations on Their Clinical, Electrocardiographic, and Electrophysiologic Profile

Introduction: A short atrioventricular decrementally conducting accessory pathway is an uncommon variant of preexcitation. Available data from small series suggest that their decremental properties might not be caused by A‐V nodal‐like tissue.

Dual chamber arrhythmia detection in the implantable cardioverter defibrillator.

Dual Chamber Arrhythmia Detection hy ICD. Introduction. Dual chamber implantable cardioverter detibrillator (ICD) technology extended ICD therapy to more than termination of hemodynamicaly unstable ventricular tachyarrhythmias. It created the basis for dual chamber arrhythmoa management. In which dependable detection is important for treatment and prevention of both ventricular and atrial arrhythmias.

Radiofrequency Catheter Ablation of Idiopathic Ventricular Tachycardia Originating in the Anterior Fascicle of the Left Bundle Branch

Ablation of an Anterior Fascicular Idiopathic VT. Introduction: Idiopathic ventricular tachycardia (VT) originating in or close to the anterior fascicle of the left bundle is rare. A patient with no structural heart disease and VT with a right bundle branch block configuration and right‐axis deviation underwent an electrophysiologic examination.

Twenty-Five Years of Insights into the Mechanisms of Supraventricular Arrhythmias

The introduction of programmed electrical stimulation of the heart and intracardiac activation mapping 35 years ago made it possible to study the site of origin or the pathway of a supraventricular tachycardia and to obtain insight into the mechanism of the tachycardia. Information from these studies has been the basis for the development of new therapies, such as arrhythmia surgery, antitachycardia pacing, and catheter ablation. Correlation of intracardiac findings with the 12‐lead ECG recorded during the tachycardia resulted in the recognition of ECG patterns characteristic of the different types of supraventricular tachycardias. Currently, gross localization of the site of origin of the arrhythmia is based on the 12‐lead ECG recorded during the arrhythmia, with fine‐tuning using intracardiac activation mapping and pacing. These developments during the past 3 decades have made accurate arrhythmia diagnosis possible and allow us to offer curative therapies to many of our patients with a supraventricular tachycardia. (J Cardiovasc Electrophysiol, Vol. 14, pp. 1020‐1025, September 2003)

Importance of the atrial channel for ventricular arrhythmia therapy in the dual chamber implantable cardioverter defibrillator.

Atrial Channel and VT Therapy in ICD. Introduction: Performance of dual chamber implantable cardioverter defibrillator (ICD) systems bas been judged based on functioning of the ventricular tachycardia:supraventricular tachycardia (VT:SVT) discrimination criteria and DDD pacing. The purpose of this study was to evaluate the use of dual chamber diagnostics to improve the electrical and antiarrhythmic therapy of ventricular arrhythmias.