Related Experiment Video
Updated: Jan 15, 2026
Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition
Published on: August 18, 2023
Ultrasound assessment of optic nerve sheath diameter during surgery in the Trendelenburg position
Tomasz Skladzien1, Emilia Kurdziel1, Mikolaj Przydacz2
1DEPARTMENT OF INTENSIVE INTERDISCIPLINARY CARE, COLLEGIUM MEDICUM, JAGIELLONIAN UNIVERSITY, CRACOW, POLAND.
Objective:
Aim: To determine whether the Trendelenburg position during laparoscopic urological surgery changed the ONSD and whether changes correlated with postoperative complications.
Patients And Methods:
Materials and Methods: In this prospective study, we measured ONSD before patients were placed in the Trendelenburg position. Then the Trendelenburg position was established by tilting the operating table to 20-25 degrees. After surgery, the patients were placed in a horizontal position, and the second measurement of ONSD was obtained.
Results:
Results: The study included 69 patients. The average preoperative ONSD in the right eye was 5.8±0.7 mm and 5.8±0.8 mm in the left eye. The average postoperative ONSD in the right eye was 6.6±0.8 mm and 6.6±0.7 mm in the left eye. The differences between postoperative and preoperative values in the right and left eyes were statistically significant (p<0.000001). ONSD increases above the norm did not correlate with the incidence of postoperative nausea (p=0.94), delirium (p=0.81), or the time to patient awakening (p=0.29).
Conclusion:
Conclusions: ONSD increased in patients who underwent surgical procedures performed in the Trendelenburg position, but the increase did not correlate with postoperative complications.
