B-Left HF: Biventricular Versus Left Univentricular Pacing With Implantable Cardiac Defibrillator (ICD) Back-Up in Heart Failure Patients

Exclusion Criteria

• •Have a CRT device already implanted
• •Have a standard indication for bradycardia pacing
• •Have a history of chronic atrial fibrillation \[AF\] (continuous AF lasting \> 1 month) within 1 year prior to enrollment or have undergone cardioversion for AF in the past month)
• •Have the ability to walk \> 450 meters during the 6-minute walk test
• •Have uncorrected primary valvular disease
• •Have had a recent myocardial infarction, unstable angina or cardiac revascularization (percutaneous transluminal coronary angioplasty \[PTCA\] or coronary artery bypass graft \[CABG\]) within 1 month of enrollment
• •Have had cerebrovascular accident (CVA) or transient ischemic attack (TIA) within 3 months of enrollment
• •Have a life expectancy of less than one year
• •Are unable to comply with the follow-up schedule and tests
• •Are minors (age below 18 years)
• •Are pregnant or are planning for pregnancy in the next 6 months