Association Between Cerebral Desaturation and Postoperative Delirium in Thoracotomy With One-Lung Ventilation: A Prospective Cohort Study

BACKGROUND: The association between cerebral desaturation and postoperative delirium in thoracotomy with one-lung ventilation (OLV) has not been specifically studied. METHODS: A prospective observational study performed in thoracic surgical patients. Cerebral tissue oxygen saturation (Scto(2)) was monitored on the left and right foreheads using a nearinfrared spectroscopy oximeter. Baseline Scto(2) was measured with patients awake and breathing room air. The minimum Scto(2) was the lowest measurement at any time during surgery. Cerebral desaturation and hypersaturation were an episode of Scto(2) below and above a given threshold for >= 15 seconds during surgery, respectively. The thresholds based on relative changes by referring to the baseline measurement were