Table 1.
Mean ± SEM of the changes in cardiovascular parameters during a 60-sec breath-hold starting from different arterial blood gas levels (n = 6, *P < 0.05)
| Start level | ΔHR | ΔMAP | |
|---|---|---|---|
| Pao2 | Paco2 | ||
| 100 | 30 | 7.9 ± 5.9 | −15.6 ± 2.2* |
| 40 | 5.2 ± 4.7 | −9.8 ± 3.4* | |
| 50 | 9.4 ± 4.1 | −9.3 ± 1.7* | |
| 80 | 30 | 15.1 ± 9.6 | −18.0 ± 2.0* |
| 40 | 5.8 ± 3.1 | −17.5 ± 3.7* | |
| 50 | 8.8 ± 2.8* | −14.5 ± 4.0* | |
A significant drop in MAP was observed in all levels, while a change in HR was only seen during the breath-hold in the hypoxemic and hypercapnic level. HR, heart rate (beats/min); MAP, mean arterial blood pressure (mmHg).