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Effect of hemoglobin (Hgb) and arterial partial pressure of carbon dioxide (PaCO2) on pulmonary and left carotid blood flow. Pooled data from 15 lambs sorted by Hgb and PaCO2 showing changes in carotid (A) and pulmonary (B) blood flow. Carotid blood flow is more sensitive than pulmonary blood flow to changes in PaCO2. *, P < 0.05 by analysis of variance (ANOVA) post hoc test with change in PaCO2; #, P < 0.05 between Hgb groups.
