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Eyes as a window to the brain: ultrasound may spot pressure changes during surgery

NCT ID NCT07784361

Knowledge-focused Sponsor: Gaziantep City Hospital Source: ClinicalTrials.gov ↗

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Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
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Paused for now. It may or may not start again.
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Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

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Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

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Status unknown
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First seen Aug 25, 2026 · Last updated Aug 26, 2026 · Updated 1 time

Summary

This study explores whether ultrasound measurements of the eye can detect changes in brain pressure during laparoscopic gallbladder surgery. The surgery uses carbon dioxide gas to inflate the abdomen, which may affect pressure inside the skull. Researchers will compare two different gas pressure levels and use ultrasound to measure the optic nerve sheath and eyeball size, which may reflect brain pressure changes. The goal is to find a non-invasive way to monitor brain pressure and improve patient safety during surgery.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Ocular ultrasound measurement of optic nerve sheath diameter and eyeball transverse diameter
What this could lead to
If successful, this could provide a non-invasive way to monitor brain pressure during surgery, potentially improving patient safety.
What could go wrong
This is a small, early-stage study. The measurements may not reliably reflect true brain pressure, and results may not apply to all patients or surgeries.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 68 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Aug 2026

An estimate. Start dates often move.

Expected to finish

Oct 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

The study population consists of adult patients aged 18-80 years, classified as ASA I-II physical status, who are scheduled to undergo elective laparoscopic cholecystectomy in a tertiary care hospital setting. Patients are observed within the routine clinical workflow of the anesthesia and general surgery departments.

Ages

18 to 80 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patients aged between 18 and 80 years. * Patients scheduled for laparoscopic cholecystectomy. * ASA (American Society of Anesthesiologists) physical status I or II. Exclusion Criteria: * History of intracranial space-occupying lesion or high intracranial pressure (ICP). * History of abdominal trauma. * History of orbital/ocular trauma.

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Conditions

The condition(s) this trial relates to.

intracranial hypertension

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Intracranial pressure increase Laparoscopic cholecystectomy surgery Optic nerve sheath diameter measurement

How to take part

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  1. The official record

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