Patrick J. Tchou

TRANSMEMBRANE VOLTAGE CHANGES PRODUCED BY REAL AND VIRTUAL ELECTRODES DURING MONOPHASIC DEFIBRILLATION SHOCK DELIVERED BY AN IMPLANTABLE ELECTRODE

Defibrillation Shock‐Induced Virtual Electrodes. Introduction: Epicardial point stimulation produces nonuniform changes in the trans membrane voltage of surrounding cells with simultaneous occurrence of areas of transient positive and negative polarization. This is the phenomenon of virtual electrode. We sought to characterize the responses of epicardial ventricular tissue to the application of monophasic electric shocks from an internal transvenous implantable cardioverter defibrillator (ICD) lead.

Prevalence, Predictors, and Mortality Significance of the Causative Arrhythmia in Patients with Electrical Storm

Introduction: Electrical storm (ES) is characterized by either refractory ventricular tachycardia (VT) or ventricular fibrillation (VF). However, little is known about the prevalence, predictors, and mortality implications of the causative arrhythmia in ES. We sought to assess the prevalence, predictors, and survival significance of VT and VF as the causative arrhythmia of ES in implantable cardioverter defibrillator (ICD) patients.

Usefulness of Midodrine in Patients with Severely Symptomatic Neurocardiogenic Syncope: A Randomized Control Study

Midodrine for Neurocardiogenic Syncope. Introduction: The efficacy of midodrine for the management of patients with neurocardiogenic syncope was assessed prospectively in a randomized control study.

Efficacy of Adjuvant Anterior Left Atrial Ablation During Intracardiac Echocardiography‐Guided Pulmonary Vein Antrum Isolation for Atrial Fibrillation

Background: Recent data have shown that the septum and anterior left atrial (LA) wall may contain “rotor” sites required for AF maintenance. However, whether adding ablation of such sites to standard ICE‐guided PVAI improves outcome is not well known.

Effects of 2,3-Butanedione Monoxime on Atrial—Atrioventricular Nodal Conduction in Isolated Rabbit Heart

BDM Effects on AVN Conduction. Introduction: 2,3‐Butanedione monoxime (BDM) has been found to reversibly block cardiac contraction, without blocking electrical conduction. This study characterizes the dose‐dependent effects of BDM on the conduction through the atrioventricular node (AVN) of rabbit heart.

Cardiac Effects of Electrical Stun Guns: Does Position of Barbs Contact Make a Difference?

Background: The use of electrical stun guns has been rising among law enforcement authorities for subduing violent subjects. Multiple reports have raised concerns over their safety. The cardiovascular safety profile of these devices in relationship to the position of delivery on the torso has not been well studied.

Incidence of atrial arrhythmias detected by permanent pacemakers (PPM) post-pulmonary vein antrum isolation (PVAI) for atrial fibrillation (AF): correlation with symptomatic recurrence.

Background: Studies examining AF recurrences post‐PVAI base recurrence on patient reporting of symptoms. However, whether asymptomatic recurrences are common is not well known.

Cardiac bioelectric therapy

Cardiac bioelectric therapy : , Cardiac bioelectric therapy : , کتابخانه دیجیتال جندی شاپور اهواز

OPTIMIZED FIRST PHASE TILT IN PARALLEL-SERIES BIPHASIC WAVEFORM

“Parallel‐Series” Biphasic Waveform. Introduction: A biphasic defibrillation waveform can achieve a large second phase leading‐edge voltage by a “parallel‐series” switching system. Recently, such a system using two 30‐μF capacitances demonstrated better defibrillation threshold than standard waveforms available in current implantable devices. However, the optimized tilt of such a “parallel‐series” system had not been defined.

Radiofrequency Catheter Ablation of the Left Bundle Branch in a Canine Model

Left Bundle Branch Ablation. Introduction: Transcatheter ablation of the left bundle branch may be considered for management of selected macroreentrant ventricular tachycardias. Left bundle ablation can also change the sequence of left ventricular contraction and may simulate pacing in hypertrophic obstructive cardiomyopathy. The purpose of this study was to determine electrophysiologic and anatomic parameters for successful selective transcatheter left bundle ablation in a canine model.