P-116 Multi-center evaluation of an automatic sensing feature in dual-chamber pacemakers

Abstract

Objectives: To demonstrate that an autosensing function provided by a new dual-chamber pacemaker selects an appropriate sensing threshold setting in the atrium and ventricle. Methods: All patients were implanted with a Talent Model 233 DR dualchamber pacemaker (ELA Medical), activating an algorithm that automatically measures the sensing threshold in each chamber and adjusts it accordingly. A variety of marketed atria1 and ventricular pacing and sensing leads were used. At pre-discharge, one month and three months, autosensing threshold measurements were compared to manual sensing threshold measurements. When pacing occurs, the algorithm drives the sensing threshold toward a preset minimum to make the pacemaker as sensitive as possible to ensure sensing when intrinsic rhythm reemerges. Two different analyses were therefore performed: with and without pacing. Population: The study population consisted of 34 patients (18 F, mean age 74 y.). Primary indications for implant were: sinus node dysfunction (45.5%), AV block (24.2%), bradycardia-tachycardia syndrome (21.2%), chronotropic incompetence (9.1%), vase-vagal or carotid-sinus syndrome (3.0%).