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Updated: Apr 5, 2026

Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition

Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition

Published on: August 18, 2023

Position does not affect the optic nerve sheath diameter during laparoscopy.

Sang Hun Kim¹, Hyung Jin Kim¹, Ki Tae Jung¹

¹Department of Anesthesiology and Pain Medicine, Chosun University Hostpital, Gwangju, Korea.

Korean Journal of Anesthesiology

|August 11, 2015

Summary

This summary is machine-generated.

Optic nerve sheath diameter (ONSD) slightly increased during laparoscopic surgery but showed no significant difference based on patient positioning. This suggests intracranial pressure (ICP) changes are minimal regardless of position in patients without intracranial pathology.

Keywords:

Intracranial pressure Laparoscopy Optic nerve Trendelenburg position Ultrasonography

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Area of Science:

Anesthesiology
Neurosurgery
Surgical Innovation

Background:

Intracranial pressure (ICP) can increase during laparoscopic surgery, influenced by patient positioning.
Optic nerve sheath diameter (ONSD) measured via ultrasound offers a rapid, non-invasive method to assess ICP.
Understanding ICP dynamics during surgery is crucial for patient safety.

Purpose of the Study:

To investigate the changes in ONSD in response to positional changes during laparoscopic surgery.
To evaluate the impact of Trendelenburg and Reverse Trendelenburg positions on ONSD.

Main Methods:

Fifty-seven female patients undergoing laparoscopic surgery were divided into Trendelenburg (n=27) and Reverse Trendelenburg (n=30) groups.
ONSD, PaCO2, end-tidal CO2 (ETCO2), and mean arterial pressure (MAP) were measured at six time points post-anesthesia induction.
Patients were monitored for changes after pneumoperitoneum and positional adjustments.

Main Results:

ONSD, ETCO2, and MAP showed a transient increase within 15 minutes after pneumoperitoneum and positional changes in both groups, returning to baseline.
No statistically significant differences in ONSD, PaCO2, ETCO2, or MAP were observed between the Trendelenburg and Reverse Trendelenburg groups.
Demographic data, procedure duration, and anesthesia characteristics were comparable between groups.

Conclusions:

ONSD demonstrated a slight, temporary increase during laparoscopic surgery with pneumoperitoneum, irrespective of patient position.
The study suggests that ICP elevations are minimal and position-independent during short laparoscopic procedures in patients without pre-existing intracranial conditions.