Inspiratory and Exspiratory Carbon Dioxide Concentrations During Halothane Anesthesia in Infants

Abstract
Carbon dioxide concentrations in respired air were measured in 23 infants, who underwent operation to correct cleft lip and palate. Measurements were carried out before,during and after halothane anesthesia, using various non-rebreathing valves, pediatric circle systems, and the Ayre T piece. End-tidal CO2 concentrations in awake infants were lower than in adults. During halothane anesthesia end-tidal CO2 concentrations increased significantly. Differences between the various non-rebreathing valves and pediatric systems were discussed.