Abstract
Background & Objectives: General Anaesthesia includes supine position and muscle paralysis which promote atelectasis and hypoxia. The present study was undertaken with an objective to analyse alteration in arterial oxygen content in patients under general anaesthesia and its relation with time. Materials & Methods: Two arterial blood samples were obtained at induction and recovery from 48 adult ASA I patients posted for head & neck and limb surgeries under general endotracheal anaesthesia. Results: No significant change observed in arterial oxygen content. But, PaO2/ FiO2 ratio at recovery was found to be significantly lower than baseline.Conclusion: Lung function deteriorates perioperatively and more so with longer duartions of anaesthesia exposure. Hence, oxygen supplementation is essential in such cases in the postoperative period.
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