Summary of demographic characteristics
| Hypercapnia | Normocapnia | Hypocapnia | |
|---|---|---|---|
| Age (y) | 57.1 ± 22.8 | 49.9 ± 17.3 | 59.8 ± 14.4 |
| Sex (n) | |||
| Male | 7 | 10 | 9 |
| Female | 9 | 4 | 6 |
| ABG latency | 13.5 ± 11.3 | 9.7 ± 7.0 | 10.4 ± 7.0 |
| HCT | 29.3 ± 2.7* | 34.2 ± 5.2 | 32.4 ± 5.9 |
| ABG values between groups | |||
| pCO2 | 54.4 ± 8.4*† | 39.8 ± 3.3 | 31.6 ± 2.6*† |
| O2 | 101.5 ± 70.7 | 95.0 ± 38.1 | 91.9 ± 24.5 |
| HCO3 | 28.4 ± 3.9*† | 24.1 ± 3.3 | 23.2 ± 2.4† |
| pH | 7.34 ± .06*† | 7.40 ± .05 | 7.48 ± .04*† |
Note:—ABG indicates arterial blood gas; HCT, hematocrit; pCO2, partial pressure of carbon dioxide; O2, oxygen saturation; HCO3, bicarbonate. All units are expressed as mean ± SD. Units of measurement are hours for ABG latency, % blood volume for HCT, mm Hg for pCO2, % saturation for O2, and mmol/L for HCO3.
* Indicates statistically significant difference from normocapnia group.
† Indicates statistically significant difference between hypercapnia and hypocapnia groups.