ECG Belt for CRT Response

Eligibility Details: Inclusion Criteria: - Indicated for CRT, with QRS duration ≥130 ms, and planned to be implanted with a market-released Medtronic CRT device with AdaptivCRT and a Medtronic quadripolar LV lead. - Meets at least one of the following criteria: QRS duration < 150 ms, Prior documented Myocardial Infarction, Non-LBBB - LVEDD ≥ 55 mm, as determined by site Exclusion Criteria: - Permanent/persistent AF or presenting with AF - Pre-existing or previous LV lead or other confounding devices e.g. Left Ventricular Assist Device, Vagal Nerve Stimulator - Currently implanted with IPG or ICD with > 10% RV pacing - Permanent complete AV block - Enrolled in a concurrent study that may confound the results of this study. Pre-approval from the study manager is required for enrollment of a patient that is in a concurrent study. - Less than 1 year life expectancy - Vulnerable adults - Younger than 18 years of age