Multisite Pacing With a Quadripolar Lead

Inclusion Criteria: * Have a scheduled CRT implantation at the participating clinical study site * Have NYHA functional class III or IV, ejection fraction less than or equal to 35%, and QRS duration greater than 120ms * Be undergoing a new St. Jude Medical CRT-D device system (including LV lead) implantation * Have the ability to provide informed consent for study participation and be willing and able to comply with the prescribed perioperative evaluations Exclusion Criteria: * Have persistent or permanent atrial fibrillation * Have an intrinsic heart rate of \<50 beats per minute * Have a recent myocardial infarction within 40 days prior to enrollment * Have undergone cardiac surgery or coronary revascularization procedure within 3 months prior to enrollment or be scheduled for such procedures * Have had a recent CVA or TIA within 3 months prior to enrollment * Have had intravenous inotropic support in the last 30 days * Have ischemic etiology and are unable to tolerate stress echocardiography