Mean (SD) values for the physiological variables before and 10 and 60 minutes after an intravenous bolus of morphine
| Baseline | 10 minutes | 60 minutes | |
| Heart rate (beats/min) | 145 (12) | 142 (10) | 139 (13) |
| Systolic BP (mm Hg) | 39.5 (7.5) | 38.5 (8.6) | 38.9 (6.4) |
| Diastolic BP (mm Hg) | 23.8 (6.2) | 24.1 (6.3) | 23.9 (5.9) |
| Mean BP (mm Hg) | 30.6 (6.6) | 30.4 (7.1) | 30.5 (6.0) |
| RVO (ml/kg/min) | 180 (50) | 168 (43) | 171 (64) |
| SVCF (ml/kg/min) | 86 (28) | 82 (25) | 84 (35) |
| Duct size (mm) | 2.1 (0.6) | 2.0 (0.6) | 1.8 (0.6) |
BP, blood pressure; RVO, right ventricular output; SVCF, superior vena caval flow.