| Variable | Baseline (mean ± SD, n = 10) | Dobutamine 10 μg (mean ± SD, n = 10) | Dobutamine 20 μg (mean ± SD, n = 7) | p Value 0 versus dobutamine 10 μg |
| Heart rate, bpm | 67.4 ± 9.4 | 89.1 ± 18.9 | 120.1 ± 23.5 | 0.003 |
| LVEDV, ml/m2 | 78.7 ± 15.8 | 70.9 ± 8.5 | 57.44 ± 14.4 | 0.02 |
| LVESV ml/m2 | 35.2 ± 11.8 | 25.8 ± 10 | 17.7 ± 7.1 | 0.003 |
| LVSV, ml/m2 | 43.4 ± 7.5 | 45.3 ± 13.4 | 39.8 ± 9.5 | NS |
| LVCO, l/min/m2 | 2.9 ± 0.4 | 3.9 ± 1.1 | 4.7 ± 1.1 | 0.001 |
| RVEDV, ml/m2 | 132.8 ± 19.4 | 124.3 ± 25.3 | 112.7 ± 23.4 | NS |
| RVESV, ml/m2 | 63.1 ± 6.4 | 53.7 ± 22.3 | 47.9 ± 15.6 | 0.05 |
| RVSV, ml/m2 | 69.7 ± 7.7 | 70.6 ± 12.7 | 64.9 ± 11.7 | NS |
| RVCO, l/min/m2 | 4.67 ± 1.0 | 6.1 ± 1.2 | 7.6 ± 1.0 | 0.001 |
LVCO, left ventricular contractile reserve; LVEDV, left ventricular end-diastolic volume; LVESV, left ventricular end-systolic volume; LVSV, left ventricular systolic volume; RVCO, right ventricular contractile reserve; RVEDV, right ventricular end-diastolic volume; RVESV, right ventricular end-systolic volume; RVSV, right ventricular systolic volume.