Table 2.
Supine and upright respiratory data pre-Oxford, after SNP bolus, and after phenylephrine.
| Measurement | Supine | HUT |
|---|---|---|
| VE (l/min) | ||
| Pre-Oxford | 7.8 ± 0.9 | 10.2 ± 1.0† |
| SNP | 22.2 ± 7.1* | 25.9 ± 7.8* |
| Phenylephrine | 4.8 ± 0.6* | 6.9 ± 0.8*† |
| Respiratory rate (breath/min) | ||
| Pre-Oxford | 13.6 ± 1.1 | 13.3 ± 1.6 |
| SNP | 12.3 ± 1.2 | 13.2 ± 1.6 |
| Phenylephrine | 13.1 ± 1.5 | 12.7 ± 1.6 |
| ETCO2 (Torr) | ||
| Pre-Oxford | 43 ± 1 | 42 ± 1 |
| SNP | 38 ± 1* | 37 ± 1* |
| Phenylephrine | 44 ± 1 | 44 ± 1 |
Values are mean ± SEM. HUT, head up tilt; SNP, sodium nitroprusside; VE, expiratory minute volume; ETCO2, end tidal CO2; *P < 0.05 compared to Pre-Oxford; †P < 0.05 compared with supine.