The correlation of postoperative cognitive dysfunction and cerebral oximetry in geriatric patients undergoing orthopedic surgery

Background: Our primary aim in this study was compared of the type of anesthesia in geriatric patients undergoing orthopedic surgery with cerebral tissue oxygen saturation values and mini mental test scores. Our secondary aim in this study was evaluated the relationship between cerebral tissue oxygen saturation values and Mini Mental Test scores (MMT). Material and methods: A total of 40 patients over the age of 65 and above who were scheduled for PFN-A(Proximal Femoral Nail Antirotation) operation were included in our study. Cases were divided into 2 groups as general anesthesia (Group I) and spinal anesthesia (Group II). Cerebral tissue oxygen saturation right and left value and hemodynamic data were measured at regular intervals in the preoperative period until the postoperative 48th hour. MMT scores at the preoperative and 48th postoperative hours were evaluated. All data were compared between group I and group II. The relationship between cerebral oxygen saturation values and MMT scores were evaluated. Results: Although there was a decreased in the MMT scores performed at 48th postoperative hours compared with at the preoperative period, no statistically significant difference was observed between the groups(p>0.05). When the cerebral tissue oxygen saturation right and left values in the perioperative period were compared, there was no statistically significant difference between the groups, although there was a decrease in the cerebral tissue oxygen saturation values(p>0.05). When the relationship between perioperative cerebral tissue oxygen saturation right and left values and the MMT scores was examined, no statistically significant relationship was found (CI%95:0,318-35,364)(p>0.05). Conclusion: In elderly patients who undergo minimally invasive orthopedic surgery, a decrease in cerebral tissue oxygen saturation values and MMT scores can be seen in the perioperative period in both spinal anesthesia and general anesthesia. However, there was no relationship between cerebral tissue oxygen saturation values and MMT scores. More comprehensive studies are required on this subject.