TRI-V Heart Failure (HF) Implanted Cardioverter Defibrillator (ICD) Study

Inclusion Criteria: * Patient with indication for CRT-D: NYHA III-IV congestive heart failure, in spite of optimal medical treatment for their congestive heart failure * LVEDD \> 55 mm or \> 30 mm/m² BSA * EF \< 35% * Sinus rhythm and one of the following criteria: * QRS \>= 120 ms and PQ \>= 200ms * or * 2nd / 3rd degree AV block * Written informed consent Exclusion Criteria: * pacemaker indication (without ICD indication) * tricuspidal valve and/or aortic valve replacement * Indication for revascularization. * less than 3 month after heart surgery or myocardial infarction * hypertrophic obstructive cardiomyopathy * intravenous catecholamine treatment * uncorrected thyroid function * severe kidney disorder (creatinin \>2,5mg%) * no written patient consent * insufficient patient compliance * participating in another study * life expectancy \< 1 year due to other severe disease * age \< 18 years * no contraception (young women) or pregnancy