Ultrasonographic Evaluation of Optic Nerve Sheath Diameter in Patients Undergoing Retrograde Intrarenal Surgery in the Lithotomy Position

What this Trial Is About

This research aims to study how the lithotomy position affects intracranial pressure by measuring the optic nerve sheath diameter using ultrasound. The focus is on patients undergoing retrograde intrarenal surgery (RIRS), with attention to the possible increase in venous return and intra-abdominal pressure that this position may cause. The study explores these effects because the lithotomy position may compress venous structures and increase pressure inside the extremities and the head. Participants in this observational study are patients having RIRS surgery performed while in the lithotomy position. The study uses ultrasound to measure the optic nerve sheath diameter during surgery and again ten minutes after the operation to assess changes related to intracranial pressure. No additional treatments or medications are administered as part of this study. Throughout the study, participants will undergo ultrasound evaluations to monitor the optic nerve sheath diameter intraoperatively and postoperatively. Researchers will record these measurements to understand if and how the lithotomy position influences intracranial pressure. The observation period is limited to the time during and shortly after surgery, with overall participation lasting only as long as the surgical and immediate postoperative assessments.

Effect of Lithotomy Position on Optic Nerve Sheath Diameter