Cognitive impairment induced by sevoflurane anesthesia is mediated by the cholinergic system after gastrointestinal surgery in older patients: A randomized, controlled trial

Abstract

Delayed neurocognitive recovery after surgery is associated with increased morbidity and mortality. However, its mechanism of action remains controversial and complex. A prospective, double-blind, randomized controlled trial was performed at the Affiliated Hospital of Zunyi Medical University. Older patients (aged 65 years and older) who underwent gastrointestinal surgery were randomly divided into sevoflurane-based or propofol-based anesthesia groups. The Mini-Mental State Examination was performed to evaluate cognitive function. Peripheral venous blood was collected to test the levels of choline acetyltransferase and acetylcholin-esterase. A total of 75 patients were enrolled and 30 patients in each group completed the study. On Day 1 postoperation, patients in the sevoflurane group showed worse performance on the Mini-Mental State Examination than patients in the propofol group. Lower blood choline acetyltransferase concentrations and higher acetylcholinesterase concentrations were observed in patients who had sevoflurane anesthesia than in patients who had propofol anesthesia 1 day postoperative. At 3 days postoperation, patients with sevoflurane- or propofol-based general anesthesia did not differ regardless of Mini-Mental State Examination score or choline acetyltransferase and acetylcholinesterase levels. Sevoflurane-based anesthesia has short-term delayed neurocognitive recovery in older surgical patients, which may be related to central cholinergic system degeneration.

Keywords

central cholinergic system / delayed neurocognitive recovery / gastrointestinal surgery / older patients / sevoflurane anesthesia

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