[The Bain anesthetic system in facial surgery]

The BAIN circuit was studied in 11 patients undergoing maxillofacial surgery, with no respiratory deficit, and under spontaneous and assisted ventilation, with a rate of flow of gas of 80, 100, 120, 140 ml/kg/min. From the results it could be concluded that this circuit should be used with a flow of at least 140 ml/kg/min, in assisted ventilation, in order to avoid any retention of CO2. Capnographic follow-up enabled better regulation of the flow rate necessary.