Table 2.
Hemodynamic results during pacing in nonfailing hearts
| RR, ms | QRSd, ms | LVEDP, mmHg | LVPmax, mmHg | dP/dtmax, mmHg/s | dP/dtmin, mmHg/s | Stroke Volume, ml | Ejection Fraction, % | |
|---|---|---|---|---|---|---|---|---|
| DYSS | 531 ± 15 | 114 ± 7 | 7.0 ± 1.8 | 103 ± 10 | 2,487 ± 398 | −1,296 ± 214 | 19.2 ± 1.9 | 35.1 ± 2.7 |
| ENDO | 531 ± 5 | 78 ± 4* | 7.0 ± 0.6 | 115 ± 2† | 3,164 ± 103* | −1,596 ± 50† | 23.3 ± 0.3* | 42.4 ± 0.7* |
| EPI | 529 ± 5 | 98 ± 4 | 6.7 ± 0.4 | 112 ± 3 | 2,923 ± 70 | −1,424 ± 59 | 20.8 ± 0.7 | 37.6 ± 0.7 |
Values are means ± SE; n = 6. QRSd, QRS duration; LVPmax, LV maximum systolic pressure; dP/dtmin, minimum rate of LV pressure change.
*
P < 0.01, endocardial (ENDO) vs. epicardial (EPI);
†
P < 0.05, ENDO vs. EPI (comparisons performed with a two-way repeated measures ANOVA and Tukey's post hoc tests).