American Society of Anesthesiologists

Figure 5. (A) Effect of three levels of background PaCO2on phrenic nerve activity (PNG) during the hyperoxic control and carbon dioxide stimulation cycles (carbon dioxide bolus marker) at 1 MAC halothane. (B) Plot of peak phrenic nerve activity (PPA) versus PaCOsub 2 (n = 5; protocol 2). Filled circles: hyperoxic control PPA; open circles: PPA of the carbon dioxide bolus-stimulated breaths. There were no significant differences in the net phrenic responses to the carbon dioxide bolus for the three PaCO2levels.

Figure 5. (A) Effect of three levels of background Pa^CO²on phrenic nerve activity (PNG) during the hyperoxic control and carbon dioxide stimulation cycles (carbon dioxide bolus marker) at 1 MAC halothane. (B) Plot of peak phrenic nerve activity (PPA) versus Pa^COsub 2 (n = 5; protocol 2). Filled circles: hyperoxic control PPA; open circles: PPA of the carbon dioxide bolus-stimulated breaths. There were no significant differences in the net phrenic responses to the carbon dioxide bolus for the three Pa^CO²levels.

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