Figure 2. Thoracic computed tomographic scans of one pig of each group. (A) A pig from the control group with 0.3% of atelectasis (percentage of total lung area);(B) a pig from the sternotomy group with 2% of atelectasis; and (C) a pig from the bypass group with 25% of atelectasis. Figure 1shows ventilation-perfusion data for the same pigs measured with the inert gas technique.