Markers of Response in Patients Undergoing Cardiac Resynchronization Therapy
| Parameter | Measure | Response at 6 mo |
| Clinical | Composite | “Improved” |
| New York Heart Association class | Decrease by at least one class | |
| Minnesota Living with Heart Failure questionnaire | ≥9-point decrease | |
| Exercise capacity | 6-min walk | ≥10% improvement (or any improvement if walked zero at baseline) |
| LV features | LV volume | ≥15% decrease |
| LV EF | ≥5% increase | |
| LV mass | Any decrease | |
| Tei index | Any decrease | |
| Mitral valve | Mitral regurgitation | Decrease in mitral regurgitation severity |