Fig. 2From: High-flow nasal cannula in nonlaser microlaryngoscopic surgery: a prospective study of 19 cases in a chinese populationThe relationship between apnoea time and PaCO2 levels. The line represents linear regression with r = 0.808 and p < 0.001. The regression equation was PaCO2 = (42.15 ± 1.78) + (1.68 ± 0.12) × apnoea timeBack to article page