Monitoring of the inspired and end-tidal oxygen, carbon dioxide, and nitrous oxide concentrations: clinical applications during anesthesia and recovery.

摘要: Respiratory oxygen, carbon dioxide, and nitrous oxide concentrations were recorded in 20 patients breath-by-breath during general anesthesia early recovery, using the Cardiocap multiparameter monitor. Several approved maneuvers performed to demonstrate usefulness of endtidal oxygen measurement. “Oxygrams” provided by fast paramagnetic sensor confirmed capnometric information diagnosis hypoventilation, apnea, disconnections. In one patient, alarm for inspiratory concentration, set at 18%, appeared prevent alveolar hypoxia low arterial saturation from occurring when instead was turned off. Low end-tidal levels revealed inadequate fresh gas supplementation while flow circuits closed. During manual hypoventilation end anesthesia, inspiratory-expiratory difference increased almost twofold dioxide only 30%. Changes concentration often complemented oxygen-related obtained our observations. recovery room, a decrease preceded pulse oximetry readings. Therefore, it is suggested that all three gases should be monitored continuously mishaps related insufficient ventilation inappropriate immediate recovery.