PMID: 11915980Mar 28, 2002Paper

Adjustment of maximum automatic sensitivity (automatic gain control) reduces inappropriate therapies in patients with implantable cardioverter defibrillators

Pacing and Clinical Electrophysiology : PACE
Michael NiehausJürgen Tebbenjohanns

Abstract

Patients with ICDs might experience oversensing associated with inappropriate shock therapy when paced at low bradycardia rates or if they have a low intrinsic rhythm. The amplifier gain of automatic gain control is maximal at long RR intervals and might lead to oversensing of myopotentials. The hypothesis was that an individual adjustment of the sensitivity floor could reduce inappropriate ICD therapies. Fourteen patients implanted with the VENTAK MINI I/II and III in whom oversensing and/or inappropriate shocks had been documented were included in this evaluation based on stored episodes. Sensitivity was modified in all ICDs by means of noninvasive software downloading that allowed reprogramming of the maximum sensitivity from 0.14 mV in two steps to 0.27 mV ("Normal," "Less," "Least"). Provocation testing (deep inspiration, sit-ups, and abdominal pressing) was conducted at "Nominal" settings (0.14 mV) while the intracardiac electrogram with annotated event marker was running continuously and was repeated at 0.22 mV (Less) and 0.27 mV (Least). All patients evaluated had documented spontaneous episodes due to oversensing before the sensitivity floor was reprogrammed. During provocation testing at Nominal settings, oversensing ...Continue Reading

Citations

May 9, 2006·Journal of Interventional Cardiac Electrophysiology : an International Journal of Arrhythmias and Pacing·Abolfath AlizadehMohammad Ali Sadr-Ameli
Jun 21, 2008·Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology·Marcin KowalskiPeter L Friedman
Jan 13, 2006·Pacing and Clinical Electrophysiology : PACE·Charles D Swerdlow, Paul A Friedman
Feb 27, 2013·Pacing and Clinical Electrophysiology : PACE·Okan Erdogan, Beste Ozben
Dec 23, 2003·Current Opinion in Cardiology·David L Scher
Dec 19, 2019·Pacing and Clinical Electrophysiology : PACE·Samuel H BaldingerLaurent Roten
Nov 18, 2004·Pacing and Clinical Electrophysiology : PACE·José Manuel PorresBegoña Azcarate

❮ Previous
Next ❯

Related Concepts

Related Feeds

Arrhythmia

Arrhythmias are abnormalities in heart rhythms, which can be either too fast or too slow. They can result from abnormalities of the initiation of an impulse or impulse conduction or a combination of both. Here is the latest research on arrhythmias.

Bradyarrhythmias

Bradyarrhythmias are slow heart rates. Symptoms may include syncope, dizziness, fatigure, shortness of breath, and chest pains. Find the latest research on bradyarrhythmias here.

Atrial Fibrillation

Atrial fibrillation is a common arrhythmia that is associated with substantial morbidity and mortality, particularly due to stroke and thromboembolism. Here is the latest research.