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The Effects of Anesthesia on Postoperative Cognitive Functions in Patients Undergoing Sleeve Gastrectomy

Key facts

Who runs it
Sehit Prof. Dr. Ilhan Varank Sancaktepe Training and Research Hospital
Where
Türkiye1 site in 1 countryChoose a country to see its sites
Trial code
Status
Recruiting
People taking part
60 people, planned
Started
30 Sept 2025
Planned end
30 Jul 2026
Type of study
Observational, 2 groups
Record updated
9 June 2026

Who can take part

Age
18 years to 65 years
Sex
Women and men
Healthy volunteers
Cannot take part

The registry criteria, word for word

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Who can take part

  • Patients of both sexes, Patients Aged between 18 and 65 years, Patients classified as ASA(American Society of Anesthesiologists) physical status I- III, Patients with a BMI (Body Mass Index) between 35 and 50 kg/m² scheduled to undergo sleeve gastrectomy as a type of bariatric surgery for the first time

Who cannot take part

  • Patients classified as ASA physical status 4 or high, Patients with known allergy to any of the drugs used in the study, Patients with bleeding disorders, Patients with serum creatinine levels >2 mg/dL, Patients with severe arrhythmias and EF<30%, Patients with a known history of drug abuse are excluded

Check if you might fit

Answer for yourself. This is not a decision: only the study team can say whether you can take part.

  • Are you between 18 and 65 years old?

This trial has no sites in United States.

It has sites in one country. Choose a country to see its sites.

About the trial

What the trial wants to find out

In this study, the investigators want to examine the effects of intravenous anesthetic drugs and gases on cognitive functions in the postoperative period in individuals who will undergo surgery for obesity. The investigators believe that the anesthesia method we apply with inhalation gases is also as reliable method as total intravenous anesthesia for postoperative cognitive functions in these patients who undergoe sleeve gastrectomy.

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The anesthesia method applied intravenously and with inahalational gases have been applied safely for many years. Comparisons between these two anesthesia technics in obese individuals and for postoperative cognitive dysfunctions are limited.

Studies on the examination of cognitive functions in postoperative patients have gained momentum with the use of neuropsychiatric tests performed on patients who have undergone cardiac surgery and these tests have also been performed on individuals who have undergone non-cardiac surgery. And yet, similar declines in cognitive functions have been observed. For these reasons, the effects of surgery itself and anesthesia methods on cognitive functions have been studied up to date.

In this study, the investigators plan to evaluate patients who will undergo obesity surgery in both anesthesia methods by the recovery times from anesthesia and the residual effects of anesthesia, and after awakening they plan to evaluate their cognitive functions with neuropsychiatric tests that will be performed at certain intervals.

The 2 groups in the trial

  • "Total Intravenous Anesthesia"

    We planned to visit patients who will undergo sleeve gastrectomy the day before the surgery and perform MMST and ACE tests. All patients will undergo electrocardiogram, pulse oxygen saturation, arterial blood pressure monitoring and bispectral index and near infrared spectroscopy. Induction agents will be used according to ideal body weights, and after intubation, ventilation parameters will be set to ventilation control mode/pressure control mode, taking into account ideal body weights and lung protective mechanical ventilation parameters. All monitoring parameters will be noted. "Total Intravenous Anesthesia" group will receive propofol and remifentanil infusions. Dose adjustments will be made according to hemodynamic parameters, NIRS and BIS values, and the total dose used throghout will be noted. Postoperative eye opening, extubation and recovery times will be noted and both groups are going to be evaluated by postoperative cognitive tests at certain postoperative intervals.

  • "Inhalational Anesthesia"

    We planned to visit patients who will undergo sleeve gastrectomy the day before the surgery and perform MMST ve ACE tests. All patients will undergo electrocardiogram, pulse oxygen saturation, arterial blood pressure monitoring and bispectral index and near infrared spectroscopy. Induction agents will be used according to ideal body weights, and after intubation, ventilation parameters will be set to ventilation control mode/pressure control mode, taking into account ideal body weights and lung protective mechanical ventilation parameters. All monitoring parameters will be noted. "Inhalational Anesthesia" group will receive sevoflurane and remifentanyl infusion. EtSevo and total remifentanyl doses will be noted as adjusted with hemodynamic parameters, NIRS, BIS values accordingly. In both groups, postoperative eye opening, extubation and recovery times will be noted and both groups are going to be evaluated by applying postoperative cognitive tests at certain postoperative intervals.

Questions to ask the study team

  1. How often do I need to come in, and for how long each time?
  2. Are travel costs paid?
  3. Can I keep my own doctor?
  4. What happens if I want to stop?

Contact the study team: see the registry record → Contacts and Locations

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Data and sources

Registry record
Listed on ClinicalTrials.gov.
Official title
The Effects of Total Intravenous Anesthesia and Inhalational Anesthesia on Postoperative Cognitive Functions in Patients Undergoing Sleeve Gastrectomy
Fit questions
Built from NCT07637357, who can take part
Record updated
9 June 2026