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Postoperative Cognitive Function After Different Anesthetic Techniques in Obese Patients

18 juni 2026 uppdaterad av: Gaziantep City Hospital

Effects of Low-Flow Sevoflurane, Normal-Flow Sevoflurane, and Total Intravenous Anesthesia on Postoperative Cognitive Function in Obese Patients Undergoing Laparoscopic Abdominal Surgery

Obese patients are at increased risk of postoperative cognitive dysfunction (POCD). The effects of different anesthetic techniques on postoperative cognitive function remain controversial. This prospective randomized study aimed to compare the effects of low-flow sevoflurane anesthesia, normal-flow sevoflurane anesthesia, and total intravenous anesthesia (TIVA) on postoperative cognitive function and recovery characteristics in obese patients undergoing elective laparoscopic abdominal surgery. Cognitive function was assessed using the Mini-Mental State Examination (MMSE) before surgery, at postoperative 30 minutes, and on postoperative day 3.

Studieöversikt

Status

Avslutad

Betingelser

Intervention / Behandling

Detaljerad beskrivning

Obesity is associated with physiological alterations that may increase the risk of postoperative cognitive dysfunction (POCD). The influence of anesthetic techniques on postoperative cognitive outcomes in obese patients remains uncertain.

This prospective randomized study was conducted in obese patients (BMI ≥30 kg/m²) aged 18-65 years undergoing elective laparoscopic abdominal surgery under general anesthesia. Patients were randomly assigned to one of three groups: low-flow sevoflurane anesthesia, normal-flow sevoflurane anesthesia, or total intravenous anesthesia (TIVA). Anesthetic depth was monitored using bispectral index (BIS) monitoring and maintained between 40 and 60 in all groups.

The primary objective was to compare postoperative cognitive function among the three anesthetic techniques using the Mini-Mental State Examination (MMSE). MMSE scores were evaluated preoperatively, at postoperative 30 minutes, and on postoperative day 3.

Secondary objectives included comparison of recovery characteristics, including eye-opening time, extubation time, Modified Aldrete Recovery Scores, and perioperative hemodynamic parameters.

The study was approved by the Marmara University Faculty of Medicine Clinical Research Ethics Committee (Approval No. 09.2022.744) and written informed consent was obtained from all participants before enrollment.

Studietyp

Interventionell

Inskrivning (Faktisk)

90

Fas

  • Inte tillämpbar

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studieorter

  • Turkiet (Türkiye)
    • Istanbul
      • Istanbul, Istanbul, Turkiet (Türkiye), 34899
        • Marmara University Faculty of Medicine Pendik Training and Research Hospital

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

  • Vuxen
  • Äldre vuxen

Tar emot friska volontärer

Ja

Beskrivning

Inclusion Criteria:

  • Age between 18 and 65 years
  • Body mass index (BMI) ≥30 kg/m²
  • ASA physical status I-III
  • Scheduled for elective laparoscopic abdominal surgery
  • Provision of written informed consent

Exclusion Criteria:

  • History of psychiatric disease
  • Dementia or known cognitive impairment
  • Hearing or language disorders preventing MMSE assessment
  • Refusal to participate
  • Conversion from laparoscopic to open surgery

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

  • Primärt syfte: Behandling
  • Tilldelning: Randomiserad
  • Interventionsmodell: Parallellt uppdrag
  • Maskning: Dubbel

Vapen och interventioner

Deltagargrupp / Arm
Intervention / Behandling
Experimentell: Low-Flow Sevoflurane
Patients received sevoflurane anesthesia with a fresh gas flow of 1 L/min during maintenance of anesthesia. Anesthetic depth was maintained with BIS values between 40 and 60.
Läkemedel: Sevoflurane (Volatile Anesthetic)
Maintenance of general anesthesia with sevoflurane inhalation. Patients were assigned to either low-flow (1 L/min) or normal-flow (3 L/min) fresh gas flow anesthesia protocols.
Experimentell: Normal-Flow Sevoflurane
Patients received sevoflurane anesthesia with a fresh gas flow of 3 L/min during maintenance of anesthesia. Anesthetic depth was maintained with BIS values between 40 and 60.
Läkemedel: Sevoflurane (Volatile Anesthetic)
Maintenance of general anesthesia with sevoflurane inhalation. Patients were assigned to either low-flow (1 L/min) or normal-flow (3 L/min) fresh gas flow anesthesia protocols.
Experimentell: Total Intravenous Anesthesia (TIVA)
Patients received total intravenous anesthesia with propofol and remifentanil infusion. Anesthetic depth was maintained with BIS values between 40 and 60.
Läkemedel: propofol
Maintenance of total intravenous anesthesia using continuous propofol infusion under BIS monitoring.
Läkemedel: Remifentanil
Continuous remifentanil infusion was administered during maintenance of anesthesia according to study protocol.

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Mini-Mental State Examination (MMSE) Score
Tidsram: Preoperative, postoperative 30 minutes, and postoperative day 3
Postoperative cognitive function assessed using the Mini-Mental State Examination (MMSE).
Preoperative, postoperative 30 minutes, and postoperative day 3

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Eye Opening Time
Tidsram: End of surgery
Time from discontinuation of anesthetic administration to spontaneous eye opening
End of surgery
Extubation Time
Tidsram: End of surgery
Time from discontinuation of anesthetic administration to tracheal extubation.
End of surgery
Modified Aldrete Recovery Score
Tidsram: Postoperative recovery period
Recovery status assessed using the Modified Aldrete Score.
Postoperative recovery period
heart rate
Tidsram: During surgery
patient's intraoperative measured heart rate
During surgery
mean arterial pressure
Tidsram: during surgery
patient's intraoperative measured mean arterial pressure
during surgery
oxygen saturation
Tidsram: During surgery
oxygen saturation of the patient will be recorded
During surgery
end-tidal carbon dioxide
Tidsram: During surgery
end-tidal carbon dioxide of the patient will be recorded
During surgery

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Sponsor

Gaziantep City Hospital

Utredare

  • Huvudutredare: Ahmet Tunca, MD, Department of Anesthesiology and Reanimation, Gaziantep City Hospital
  • Studiestol: Seniyye Ü Zengin, MD, Department of Anesthesiology and Reanimation, Marmara University Faculty of Medicine, Pendik Training and Research Hospital
  • Studierektor: Meliha O Ergün, MD, Department of Anesthesiology and Reanimation, Marmara University Faculty of Medicine, Pendik Training and Research Hospital

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Faktisk)

10 januari 2023

Primärt slutförande (Faktisk)

20 juni 2023

Avslutad studie (Faktisk)

20 juni 2023

Studieregistreringsdatum

Först inskickad

13 juni 2026

Först inskickad som uppfyllde QC-kriterierna

18 juni 2026

Första postat (Faktisk)

24 juni 2026

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

24 juni 2026

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

18 juni 2026

Senast verifierad

1 juni 2026

Mer information

Termer relaterade till denna studie

Nyckelord

Ytterligare relevanta MeSH-villkor

Andra studie-ID-nummer

  • MU-09.2022.744

Plan för individuella deltagardata (IPD)

Planerar du att dela individuella deltagardata (IPD)?

NEJ

IPD-planbeskrivning

Individual participant data will not be made publicly available due to privacy and confidentiality considerations.

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