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Updated: Dec 10, 2025

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
Published on: February 28, 2012
Discussing deactivation of implantable cardiac defibrillators
1Department of Cardiology, Hillingdon Hospital, Uxbridge, UK.
Abstract:
Implantable cardiac defibrillators are a key component in preventing sudden cardiac death for patients with life-threatening arrhythmias. Through ageing, frailty and the progression of cardiac and non-cardiac morbidity, many will develop a 'life-limiting' condition. This raises the challenge of how to approach making decisions to deactivate the defibrillator function. This article discusses the background to deactivation of implantable cardioverter defibrillators and the practical considerations for different circumstances.
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The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials

