OPTIMA Bi-ventricular Capture Verification Study

Bi-ventricular Capture Verification Study

The purpose of this study is to characterize the morphology (shape) of the intracardiac electrograms(EGM) from patients with a resynchronization therapy device.

morphology of EGM during loss of capture in either right ventricle (RV) or left ventricle (LV) at different AV delays and LV offsets and during exercise. These EGM signals will be used to design and develop improved automatic threshold and automatic capture algorithms for CRT defibrillators (CRT-D). As well, the data collected from the study will be used to to develop other automatic algorithms for CRT-D, such as pacing parameter optimization.

Inclusion Criteria:

• Signed informed consent indicating a willingness to participate, have indications for and have been implanted with a Guidant Renewal 4 CRT-D device

Exclusion Criteria:

• Patients in atrial fibrillation that cannot be cardioverted for the study, sustained uncontrolled ventricular tachycardia (VT), sinus rhythm < 40 bpm or > 100 bpm, complete AV node block, AV node ablation, Severe aortic valve stenosis (valve area < 1.0 cm squared), frequent ectopic beats that would preclude adequate testing, lead in the great cardiac vein, women who are pregnant or who plan to become pregnant.