Abstract
A cardiac rhythm management device (CRMD) is an implanted pacemaker (PM) or cardioverter-defibrillator (ICD). All present-day ICDs provide pacing and shock therapies for bradyarrhythmias and tachyarrhythmias. In addition, some CRMDs provide cardiac resynchronisation therapy (CRT). CRT is leftor biventricular pacing to synchronise ventricular contractions in patients with heart failure and left bundle branch block or intraventricular conduction delay. CRT improves haemodynamic profiles and quality of life in these patients [1–7]. Furthermore, CRT reduces the risk of the combined end-points of death and hospitalisation for heart failure (34% for CRT; 40% for CRT/ICD) [8]. In this paper the following aspects are discussed: (1) indications; (2) device design, function andmalfunction; (3)mechanical and electromagnetic interference (EMI); and (4) management of patients with CRMD [9, 10].
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