FREEDOM - A Frequent Optimization Study Using the QuickOpt Method

* This is a prospective, double-blinded, multicenter, randomized study * Patient could be enrolled up to 2 weeks post CRT-D implant and are followed for 12 months post implant with follow-up visits at 3, 6, 9 and 12 months * Patients will be randomized at enrollment to either Group 1 ("QuickOpt Group") or Group 2 ("Control Group"). * Group 1 - The patient's device is programmed to sequential biventricular pacing mode with AV/PV and VV delays optimized using QuickOpt. For Group 1 patients, optimization using QuickOpt is performed at enrollment, 3 month, 6 month, 9 month, 12 month and at any unscheduled follow-up visits. * Group 2 - The patient's device is programmed to either simultaneous or sequential BiV pacing mode as per physician's discretion. The AV/PV and inter-ventricular (VV) delays could be programmed empirically or optimized using any non-IEGM based method as per sites standard of care. However, the Group 2 patients can be optimized only once within the first 4 weeks post implant. Any AV/PV and VV delay optimizations performed after 4 weeks post implant in Group 2 patients will be considered protocol deviations.