Intraoperative Optic Nerve Sheath Diameter Changes After Laparoscopic Surgery

Last updated: November 20, 2025
Sponsor: Kocaeli University
Overall Status: Completed

Phase

N/A

Condition

N/A

Treatment

Optic nerve sheath measurement

Clinical Study ID

NCT06209034
KÜ GOKAEK-2023/19.12
  • Ages 18-75
  • All Genders

Study Summary

Laparoscopic surgery is a widely used alternative to open surgery; Advantages include reduced bleeding and pain intensity, shorter hospital stay, and improved cosmetic results.

Laparoscopic surgery involves the creation of a carbon dioxide (CO2) pneumoperitoneum to facilitate a clear surgical view, which can result in increased intracranial pressure (ICP).

Ultrasonographic measurement of optic nerve sheath diameter (ONSD) is a simple, non-invasive, yet reliable technique for ICP assessment.Ultrasonographic assessment of optic nerve sheath diameter (ONSD) has been proposed as a non-invasive measurement of intracranial pressure.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  • 18-75 aged patients

  • American Society of Anesthesiologists Classification (ASA) I-II-III patients

  • Patients undergoing laparoscopic surgery

Exclusion

Exclusion Criteria:

  • American Society of Anesthesiologists Classification (ASA) IV-V patients

  • Those with known ophthalmic disease

  • Those with a history of ophthalmic surgery

  • Those with any known neurological disorder

  • History of intracranial hypertension

  • Patients who will undergo open abdominal surgery

Study Design

Total Participants: 55
Treatment Group(s): 1
Primary Treatment: Optic nerve sheath measurement
Phase:
Study Start date:
December 30, 2023
Estimated Completion Date:
September 15, 2024

Study Description

Ultrasonographic measurement of optic nerve sheath diameter (ONSD) is a simple, non-invasive, yet reliable technique for ICP assessment. Previous studies have demonstrated that ultrasonographic measurement of ONSD correlates with the degree of ICP and can detect intracranial hypertension in a variety of clinical settings.

It was planned to measure the optic nerve sheath throughout the surgery with the help of a linear ultrasound probe.

Ultrasonographically, in each measurement, the optic nerve sheath diameter (ONSD) was detected 3 mm behind the entry point of the optic nerve into the globe in both eyes. ONSD will be measured bilaterally 3 mm behind the papilla. It will be evaluated by transverse measurement for each optic nerve.

Connect with a study center

  • Kocaeli University

    Kocaeli,
    Turkey

    Site Not Available

  • Sevim Cesur

    Kocaeli,
    Turkey

    Site Not Available

  • Kocaeli University

    Kocaeli 306970,
    Turkey (Türkiye)

    Site Not Available

  • Sevim Cesur

    Kocaeli 306970,
    Turkey (Türkiye)

    Site Not Available

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