INvestigation on Routine Follow-up in CONgestive HearT FAilure Patients With Remotely Monitored Implanted Cardioverter Defibrillators (ICD) SysTems

Inclusion Criteria: * Indication for implantation (new, boxchange, upgrade) of ICD/ CRT-D * Written informed consent * Ejection Fraction \<= 35% * New York Heart Association (NYHA) Class I-III * Age \>=18 and \<=80 years * In patient's home environment sufficient infrastructure (analog phone line or sufficient strength of GSM (Global System for Mobile communication) mobile phone network) for running a Merlin@home transmitter is available Exclusion Criteria: * Arterio ventricular (AV) Block III / AV Block II Type Mobitz * Severe renal insufficiency * Coronary angiology intervention within previous 3 months * Myocardial infarction within previous month * Life expectancy \< 1 year * Expected poor data quality / compliance * Pregnancy * Patient is already participating to another study with active therapy arm