Changes in symptomatic status, exercise time, and left ventricular outflow tract (LVOT) gradient with different pacing modalities
| No pacing | RV pacing | Biventricular pacing | |
|---|---|---|---|
| Symptomatic status was assessed using heart failure questionnaire. Exercise time according to standard Bruce protocol. | |||
| NYHA functional class | III | III | II |
| Symptomatic status | 76 | 59 | 41 |
| QRS duration (ms) | 140 | 200 | 188 |
| Exercise time (s) | 228 | 180 | 358 |
| LVOT gradient (mm Hg) | 85 | 34 | 25 |