5. Limitations
intracranial pathologies, SAD
CEREBRAL ISCHEMIA, CARDIOVASCULAR DISEASES
There were some limitations to this study. One of the most important was that it was not technically possible for the person who recorded the data to be unaware of the airway device being used. Furthermore, as patients with normal airways were included in this study, the results may not be applicable to patients with difficult airways or extended LMA insertion durations. Third, this study was conducted with patients who had low ASA scores, and studies involving those with underlying cardiovascular diseases may provide different results. Another limitation is that we did not measure the ONSD optic nerve sheath diameter just before and after SAD insertion. Finally, the effects of SADs on ICP among patients with intracranial pathologies were not examined. Different results in terms of ONSD may be observed in patients who have a history of elevated ICP or cerebral ischemia.