Effect of intra-operative mechanical ventilation using 50% inspired oxygen on pulmonary oxygenation.
Forty-three ASA Grade I patients scheduled for elective abdominal surgery
were randomly allocated to receive either mechanical ventilation with 50% inspired oxygen (MV-O2) or room air (RA) during the operation. Pulmonary oxygenation was measured by the arterial oxygen tension (PaO2) and the alveolar-arterial oxygen tension difference (A-aDO2) before and after