Device-based QRS Evaluation

Device-based QRS Evaluation

The purpose of this study is to collect simultaneous surface electrocardiogram (ECG) recordings and Cardiac Resynchronization Therapy (CRT) intracardiac electrogram (IEGM) recordings of variations in electrical synchrony.

Inclusion Criteria:

• Already implanted with SJM Quadripolar CRT Pacing System
• Ability to provide informed consent for study participation
• Willing to comply with the study evaluation requirements
• At least 18 years of age

Exclusion Criteria:

• Resting ventricular rate >100 bpm
• Intrinsic PR interval > 300 ms
• Paroxysmal or persistent atrial tachycardia or atrial fibrillation documented
• Pregnant or plans to become pregnant during the study