Subject has congenital heart disease

Subject has a tachyarrhythmia (atrial and/or ventricular) at the time of enrollment and a cardioversion will not be attempted prior to the research procedure

Subject has unstable coronary artery disease

Subject cannot undergo transvenous catheterization

Subject has a mechanical tricuspid or aortic valve prosthesis or history of significant structural tricuspid or aortic valvular disease

Subject requires dual chamber cardiac pacing or single chamber (ventricular) pacing at rest for rate control

Subject has a recent echocardiogram (within prior 6 months) which revealed the presence of an LV thrombus

Subject is pregnant

Subject is enrolled in a concurrent study that may confound the results of this study without documented pre-approval from Medtronic study manager

Sensor Optimization of Cardiac Resynchronization Therapy Response

What this study is about