American Society of Anesthesiologists

Fig. 4. Relationship between PaO2and cerebral blood flow (CBF) at hypocapnia (square), normocapnia (circle), and hypercapnia (triangle). With both methods of CBF measurement, the relation between flow and PaCO2can be described by an exponential function (solid line). Good correlation was found for (A ) the Kety-Schmidt technique (CBFargon; r = 0.73, y = 8.2 · e0.04 x) and (B ) the transcerebral double-indicator dilution technique method (CBFTCID; r = 0.72, y = 6.2 · e0.04 x).

Fig. 4. Relationship between Pa^O²and cerebral blood flow (CBF) at hypocapnia (square), normocapnia (circle), and hypercapnia (triangle). With both methods of CBF measurement, the relation between flow and Pa^CO²can be described by an exponential function (solid line). Good correlation was found for (A ) the Kety-Schmidt technique (CBF^argon; r = 0.73, y = 8.2 · e^{0.04 x}) and (B ) the transcerebral double-indicator dilution technique method (CBF^TCID; r = 0.72, y = 6.2 · e^{0.04 x}).

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