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Eye ultrasound tracks brain pressure during obesity surgery

NCT ID NCT07662538

Knowledge-focused Sponsor: Fatih Sultan Mehmet Training and Research Hospital Source: ClinicalTrials.gov ↗

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
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 Results may not be published yet.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)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
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

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Sep 11, 2026 · Updated 3 times

Summary

This study used ultrasound to measure the optic nerve sheath (the lining around the eye nerve) in 56 adults having laparoscopic bariatric surgery. The goal was to see how brain pressure changes during surgery due to gas inflation and body positioning. No drug or treatment was tested; it was purely observational to gather knowledge.

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

58 people

The number who actually took part.

Started

Jan 2022

Finished

Jan 2024

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

Adult patients undergoing bariatric surgery under general anesthesia at our institution. The study population consists of ASA I-III patients aged 18 years and older who underwent preoperative and perioperative optic nerve sheath diameter (ONSD) measurements at predefined time points during surgery.

Ages

18 years and older

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: 1. Patients scheduled for bariatric surgery. 2. ASA physical status 1-3 3. Patients aged 18 years and older Exclusion Criteria: 1. Patients who declined to participate. 2. Age \<18 years. 3. ASA physical status IV. 4. Previous cataract surgery. 5. Presence of conditions associated with increased intracranial pressure, including hydrocephalus, cerebrovascular disease, or intracranial tumors. 6. Ocular conditions that could interfere with optic nerve sheath diameter measurement, including globe pathology or glaucoma

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Conditions

The condition(s) this trial relates to.

morbid obesity Obesity obesity disorder Pneumoperitoneum

As listed by the trial registrant

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

Morbid obesity Obesity

Contacts and locations

Locations

  • Health Sciences University Fatih Sultan Mehmet Training and Research Hospita

    Istanbul, Istanbul, 34752, Turkey (Türkiye)

More trials for these conditions

Other studies related to the condition(s) this trial covers.