AdaptResponse Clinical Trial

Inclusion Criteria:

Subject is willing to sign and date the study Patient Informed Consent Form.
Subject is indicated for a CRT device according to local guidelines.
Sinus Rhythm at time of enrollment
Complete Left Bundle Branch Block (LBBB) as documented on an ECG (within 30 days prior to enrollment). Strauss Criteria used for LBBB.
Intrinsic, normal AV conduction as documented on an ECG by a PR interval less than or equal to 200ms (within 30 days prior to enrollment).
Left ventricular ejection fraction less than or equal to 35% (documented within 180 days prior to enrollment).
NYHA class II, III or IV (documented within 30 days prior to enrollment) despite optimal medical therapy. Optimal medical therapy is defined as maximal tolerated dose of Beta-blockers and a therapeutic dose of ACE-I, ARB or Aldosterone Antagonist.

Exclusion Criteria:

Subject is less than 18 years of age (or has not reached minimum age per local law).
Subject is not expected to remain available for at least 2 years of follow-up visits.
Subject has permanent atrial arrhythmias for which pharmacological therapy and/or cardioversion have been unsuccessful or have not been attempted
Subject is, or previously has been, receiving cardiac resynchronization therapy.
Subject is currently enrolled or planning to participate in a potentially confounding drug or device trial during the course of this study. Co-enrollment in concurrent trials is only allowed when documented pre-approval is obtained from the Medtronic study manager.
Subject has unstable angina, or experienced an acute myocardial infarction (MI) or received coronary artery revascularization (CABG) or coronary angioplasty (PTCA) within 30 days prior to enrollment.
Subject has a mechanical tricuspid heart valve or is scheduled to undergo valve repair or valve replacement during the course of the study.
Subject is post heart transplant (subjects on the heart transplant list for the first time are not excluded).
Subject has a limited life expectancy due to non-cardiac causes that would not allow completion of the study.
Subject is pregnant (if required by local law, women of child-bearing potential must undergo a pregnancy test within seven days prior to device implant).
Subject meets any exclusion criteria required by local law.