Table 1.
Maximum myocardial volume change during the cardiac cycle
| Pacing Mode | Subepi | Midwall | Subendo | Timing |
|---|---|---|---|---|
| Atrial pacing | 0.959±0.050 | 0.932±0.040 | 0.897±0.070 | AVC |
| −4.1% | −6.8% | −10.3% | ||
| LV pacing—early activated region | 0.962±0.026 | 0.955±0.041 | 0.922±0.054 | Ejection |
| −3.8% | −4.5% | −7.8% | ||
| LV pacing—late activated region | 0.961±0.039 | 0.951±0.039 | 0.931±0.057 | MVO |
| −3.9% | −4.9% | −6.9% |
Values are means ± SE. The values on the top row during each pacing mode are expressed as volume relative to 1.00 at end diastole and those on the bottom row are expressed as percent change relative to end diastole. LV, left ventricular; AVC, atrial valve closure; MVO, mitral valve opening.