NCT07662538Completed
Optic Nerve Sheath Diameter Changes During Bariatric Surgery
Evaluation of Optic Nerve Sheath Diameter Changes During Laparoscopic Bariatric Surgery Performed in Reverse Trendelenburg Position
Source: ClinicalTrials.gov · Last updated 10 Sept 2026
Brief summary (registry, in English)
This prospective clinical study aimed to evaluate the effects of pneumoperitoneum and patient positioning on intracranial pressure in patients undergoing bariatric surgery. Intracranial pressure was assessed noninvasively using ultrasonographic optic nerve sheath diameter (ONSD) measurements. ONSD measurements were performed before anesthesia induction in the supine position (T0), 5 minutes after anesthesia induction (T1), 5 minutes after creation of pneumoperitoneum and placement in the reverse Trendelenburg position (T2), at the 20th minute of pneumoperitoneum (T3), and 5 minutes after termination of pneumoperitoneum and return to the supine position (T4). The study aimed to determine the effects of anesthesia, pneumoperitoneum, and surgical positioning on intracranial pressure during bariatric surgery
- Status (registry)
- Completed
- Study type
- Observational
- Enrollment
- 58 (actual)
- First submitted
- 16 Jun 2026
- Start date
- 1 Jan 2022
- Primary completion date
- 30 Jan 2024
- Lead sponsor
- Fatih Sultan Mehmet Training and Research Hospital
- Diseases
- Obesity
- NCT number
- NCT07662538
What you commit to
- Study type: Observational
- Participants enrolled: 58
- From 1 Jan 2022 to the primary completion date, 30 Jan 2024
- 1 site in 1 country
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Prior treatment
- Previous cataract surgery.
Other illness
- Presence of conditions associated with increased intracranial pressure, including hydrocephalus, cerebrovascular disease, or intracranial tumors.
- Ocular conditions that could interfere with optic nerve sheath diameter measurement, including globe pathology or glaucoma
Age
- Age \<18 years.
Other
- Patients who declined to participate.
- ASA physical status IV.
Who the study is looking for
- Patients scheduled for bariatric surgery.
- ASA physical status 1-3
- Patients aged 18 years and older
Age in the registry: 18 years to - · Sex: All · Does not accept healthy volunteers
Sites (1)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| Health Sciences University Fatih Sultan Mehmet Training and Research Hospita Coordinator of this site? Confirm its status | Istanbul | Turkey (Türkiye) | Unknown status |
This page is information, not medical advice. Discuss any trial with your doctor.