Fig. 4.
Hypoxic ventilation before, during, and after dexmedetomidine- or propofol-induced sedation in one subject. Hypoxic ventilation is displayed breath-by-breath as oxygen saturation versus minute ventilation in one individual. As demonstrated in these examples of the breath-by-breath plots of the peripheral oxygen saturation versus minute ventilation before, during, and after dexmedetomidine (top) and propofol-induced sedation (bottom) in the same subject, the minute ventilation did not change during the hypoxic test during propofol sedation, but did decrease during dexmedetomidine sedation in this individual.