Fig. 2.
Effect of body mass index on lung volume (A), arterial oxygenation (B), and respiratory mechanics (C and Dā). BMI, body mass index; FRC, functional residual capacity; Ī (A-a) O2, Alveolar-arterial oxygen difference; Cst,rs, compliance of the total respiratory system; Rst,rs, resistance of the total respiratory system. (Modified from reference 3 with permission of Anesthesia & Analgesia.)