The purpose of this study is to gather information on the safety and effectiveness of cardiac resynchronization therapy (CRT) in patients who have mild heart failure (HF) and left bundle branch block (LBBB).
LVEF 35%-50% NYHA class I-II QRS duration of ≥120ms Left bundle branch block (LBBB) Patient is able to receive a transvenous pectoral CRT implant Patient is able to sign informed consent Two echocardiograms are required to confirm a stable reduced LVEF Patient is on optimal and stable medical therapy (ACE inhibitor or AT1 blocker, beta blocker, etc. over the last 6 months)
Exclusion Criteria:
Advanced comorbid conditions with life expectancy <1 year Patient is <18 of years of age Patient has a CRT device Female patients who is pregnant or not on a reliable form of birth control. Women of childbearing potential are required to have negative pregnancy test within the 7 days prior to device implant Unwilling or unable to return for required follow-up visits Patient decides study participation is cost-prohibited
