Abstract
Objective: To investigate which vital signs are relevant to cerebral oxygenation using near infrared spectroscopy (regional saturation of oxygen, rSO2) as an index. Methods: Subjects were surgery patients who were managed using rSO2 monitoring under anesthesia. Subjects included patients who had suffered lung tumors (LT) with resected lung lobes (LT group: n=50), those who suffered abdominal aortic aneurysms (AAA) and who underwent Y-type blood vessel grafts (AAA group: n=42), and those suffering from thoracic abdominal aortic aneurysms (TAAA) and who underwent thoracic and abdominal blood vessel prosthesis implantation (TAAA group: n=43). We investigated the perioperative values of respiratory and/or circulatory indices retrospectively, and investigated their correlations with rSO2 values by multiple regression analysis. Results: The indices found to affect rSO2 values were Hb, PaO2 and PaCO2 in the LT group; Hb and central venous oxygen saturation (ScvO2) in the AAA group; body temperature (BT) and mixed venous oxygen saturation (SvO2) in the TAAA group. Conclusions: We believe that Hb, PaO2, PaCO2 and BT are important indices for maintaining appropriate brain oxygenation.
