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Body position and late postoperative nocturnal hypoxaemia

Thirteen patients were monitored for nocturnal body position (supine vs. side) and arterial oxygen saturation pre‐operatively and on the second postoperative night after major abdominal surgery. The number of positional changes were significantly decreased after operation (p < 0.05) with a trend towards more time spent in the supine position (p = 0.1). Individual mean arterial oxygen saturation decreased postoperatively (p < 0.05) but without a difference between the supine and side positions (p = 0.9). Pre‐operatively, episodic desaturations were significantly more frequent in the supine position than on the side (p < 0.05) but not postoperatively. Pain was the most frequent reason for decreased nocturnal movements.