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The effect of cigarette smoking on postoperative arterial oxygen saturation was evaluated in 45 adult patients using pulse oximetry. Patients were divided into a smoking group (n = 20) and a non-smoking group (n = 25) based on current smoking habits up until the time of surgery. The two groups were similar with respect to sex, ASA physical status, surgical procedure, duration of anaesthesia, narcotic and anaesthetic use and recovery characteristics. The non-smoking group was, however, significantly (P less than 0.05) older than the smoking group. Postoperative oxygen saturation (SaO2) decreased (P less than 0.001) during transport of both groups of patients from the Operating Room to the Recovery Room; a decrease which was significantly greater in the smoking group. The severity of hypoxaemia was also significantly greater in the smoking group than in the non-smoking group. This study suggests that cigarette smoking contributes to postoperative arterial oxygen desaturation following general anaesthesia and that supplemental oxygen should be administered to these patients during postoperative transport.
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