Perioperative and postoperative effects of hydrostatic pressure applied to the dura mater on central nervous system in unilateral biportal endoscopic spine surgery

The ONSD at T3 was higher than those at all time points. For an ONSD value >5.3 mm, the sensitivity, specificity, positive predictive, and negative predictive values were 87.5%, 71.9%, 50.9%, and 94.5%, respectively (Area under the curve 0.830, 95% Confidence Interval: 0.761-0.899, <i>p</i><0.001) CONCLUSION: We think that the hydrostatic pressure applied to the dura mater in unilateral biportal endoscopic (UBE) surgeries causes changes in the ONSD sheath diameter and that monitoring ONSD with peroperative USG can reduce the possible complications in order to reduce the effects of this pressure on the central nervous system.