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Effect of end-tidal PCO2 and hematocrit on CBF measurements. Mean CBF value of all measurements in each subject vs. mean end-tidal PCO2 (A) and mean hematocrit (B). Note that females have higher CBF, but lower hematocrit and end-tidal PCO2 than males. CBF, cerebral blood flow; PETCO2, end-tidal expiratory PCO2.
