Yaman, FerdaPehlivanlı, FarukAydın, Gülçin2025-01-212025-01-2120201305-49532587-1579https://doi.org/10.20515/otd.739333https://search.trdizin.gov.tr/tr/yayin/detay/407352https://hdl.handle.net/20.500.12587/22618Patients are positioned with hyperextension of head and neck at Semi-Fowler state during general anaesthesia to facilitatethe surgical procedure. We aimed to determine the changes of serebral oxygenation in this position during thyroidectomy surgery.22 patients were recruited prospective observational study. Cerebral oxygenation were monitored, left and right cerebral regionaloxygen saturation were measured continuously. Heart rate, mean arterial pressure, end-tidal carbondioxide were measured andevaluated at baseline, after positioning at 15th, 30th, 90th minutes and after surgery at corrected position. After 90 minutes,significant decrease was seen cerebral oxygenization right side compared to the baseline (p ? 0.05). 30th minute cerebraloxygenization right value decreased significantly compared to the 15th minute. 30th minute, cerebral oxygenization left valuedecreased significantly compared to 15 minutes (p ? 0.05). 90th minute cerebral oxygenization left value decreased significantlycompared to the 30th minute (p < 0.05). Significant decrease in cerebral oxygen saturation in both cerebral sides had been shown inrelation to prolonged surgery time. Cerebral oxygenation was effected by the position given for thyroidectomy surgery. High-riskpatients can be detected by regional cerebral oxygen saturation and prevent cerebral ischemia. Precautions should be taken for highrisk patients.eninfo:eu-repo/semantics/openAccessGenel ve Dahili TıpSağlık Bilimleri ve HizmetleriCerrahiArticle42664565110.20515/otd.739333407352