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Fig. 1 —Mean segmental distention scores on supine positioning with patient-controlled room air (RA) and automated carbon dioxide (CO₂). Lower scores represent greater distention. Mean segmental distention was better for CO₂ compared with RA in all segments, but differences were statistically significant only for sigmoid, descending, and transverse segments. Sigmoid segment on supine had worst mean distention score among all segments (supine or prone) for both RA and CO₂.

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