Ultrasound assessment of optic nerve sheath diameter during surgery in the Trendelenburg position
Related Experiment Video
Updated: Jan 15, 2026
Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition
Published on: August 18, 2023
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.
