Table 1.
Effect of inhalation of different mixtures of O2 and CO2 on blood pressure and pulse rate (n=12; means (SD) on both study days
| SBP (mm Hg) | DBP (mm Hg) | MAP (mm Hg) | PR (beats/min) | |||||
| Baseline | End of breathing period | Baseline | End of breathing period | Baseline | End of breathing period | Baseline | End of breathing period | |
| RVA, study day | ||||||||
| 100% O2 | 116 (9) | 116 (12) | 64 (9) | 64 (9) | 81 (8) | 81 (8) | 69 (8) | 68 (11) |
| 97.5% O2 + 2.5% CO2 | 121 (12) | 121 (10) | 68 (13) | 65 (9) | 86 (12) | 84 (9) | 68 (11) | 72 (13) |
| 95% O2 + 5% CO2 | 118 (12) | 121 (11) | 65 (9) | 63 (11) | 83 (9) | 82 (10) | 66 (11) | 73 (12) |
| 92% O2 + 8% CO2 | 119 (12) | 133 (9)* | 68 (9) | 67 (17) | 85 (8) | 89 (13)* | 67 (11) | 79 (13)* |
| LDV, study day | ||||||||
| 100% O2 | 116 (13) | 116 (10) | 65 (12) | 64 (10) | 82 (10) | 82 (9) | 70 (12) | 67 (6) |
| 97.5% O2 + 2.5% CO2 | 114 (12) | 120 (10) | 67 (12) | 69 (12) | 83 (10) | 86 (11) | 66 (13) | 66 (9) |
| 95% O2 + 5% CO2 | 115 (9) | 122 (8) | 67 (11) | 68 (6) | 83 (10) | 86 (5) | 71 (11) | 74 (13) |
| 92% O2 + 8% CO2 | 120 (12) | 133 (13)* | 68 (11) | 74 (8) | 86 (9) | 94 (7)* | 67 (9) | 74 (11)* |
*p<0.05 versus 100% O2.