• Akihiro Kanaya, Daizoh Satoh, and Shin Kurosawa.
• Department of Anesthesiology, Tohoku University Hospital, Sendai 980-8574.
• Masui. 2011 Oct 1;60(10):1149-52.

BackgroundVentilation with lower tidal volume improves outcome in acute respiratory distress syndrome (ARDS). However, it is questionable if ventilation strategy using lower tidal volumes created for patients with ARDS can be transferred to healthy patients undergoing general anesthesia. We assessed the effects of ventilation with lower tidal volumes and conventional tidal volumes on functional residual capacity (FRC) and Pa(O2)/FI(O2) (P/F) ratio in patients undergoing general anesthesia for upper abdominal surgery.MethodsWe studied 16 patients undergoing general anesthesia for upper abdominal surgery. Patients were randomized to ventilation with low tidal volume group (7 ml x kg(-1) predicted body weight n = 8) or conventional tidal volume group (10 ml x kg(-1) predicted body weight n = 8). We measured FRC and P/F ratio after induction of general anesthesia and start of surgery in both groups.ResultsThere were no differences in FRC and P/F ratio between ventilation with lower tidal volume group and conventional tidal volume group (P > 0.05), but peak airway pressures with conventional tidal volume group were higher than those with lower tidal volume group only after induction of general anesthesia (P < 0.05).ConclusionsLower tidal volumes are better than conventional tidal volumes in view of airway pressure and lung protective strategy during general anesthesia.

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