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Published on: February 27, 2018
Metabolic syndrome and perioperative neurocognitive disorders: epidemiology, mechanisms, and interventions
Jiayi Xie1, Bokang Yang1, Jinxiang Xie1
1The First School of Clinical Medicine, Lanzhou University, Lanzhou, Gansu, China.
Insights
Metabolic syndrome significantly impacts brain health in older surgical patients, increasing risks for neurocognitive disorders. Optimizing metabolic health before and during surgery is crucial for improving brain outcomes.
Area of Science:
- Neuroscience
- Metabolic Medicine
- Geriatric Surgery
Background:
- Perioperative neurocognitive disorders are a growing concern in elderly surgical patients.
- Metabolic syndrome, characterized by obesity, insulin resistance, hypertension, and dyslipidemia, is increasingly prevalent.
- The link between metabolic syndrome and cognitive decline in the perioperative setting requires further elucidation.
Purpose of the Study:
- To review the epidemiological and mechanistic connections between metabolic syndrome and perioperative neurocognitive disorders.
- To identify specific metabolic phenotypes predicting different cognitive impairment phases.
- To explore potential perioperative management strategies and interventions.
Main Methods:
- Comprehensive literature review of epidemiological and mechanistic studies.
- Analysis of individual metabolic syndrome components as predictors of cognitive impairment.
- Evaluation of proposed pathophysiological cascades involving inflammation, blood-brain barrier integrity, and insulin resistance.
- Assessment of current and emerging therapeutic interventions.
Main Results:
- Distinct metabolic phenotypes are associated with specific types of perioperative neurocognitive impairment.
- A proposed cascade involves systemic inflammation, blood-brain barrier disruption, inflammasome activation, central insulin resistance, mitochondrial dysfunction, and synaptic degradation.
- Current perioperative strategies and interventions like SGLT2 inhibitors and antioxidants show potential.
- A significant gap exists in dedicated randomized controlled trials for this patient population.
Conclusions:
- Metabolic syndrome poses a significant risk for perioperative neurocognitive disorders in older adults.
- A phenotype-specific approach to metabolic optimization is essential for improving neurocognitive outcomes.
- Further research, particularly randomized controlled trials, is needed to validate interventions.
Abstract:
Perioperative neurocognitive disorders, an umbrella term encompassing preoperative cognitive impairment, acute postoperative delirium, and longer term postoperative neurocognitive disorders, represent significant complications for the growing population of older surgical patients. The rising prevalence of metabolic syndrome, defined by the clustering of abdominal obesity, insulin resistance, hypertension, and dyslipidemia, necessitates a deeper understanding of its impact on the perioperative brain. This comprehensive review elucidates the intricate epidemiological and mechanistic links between metabolic syndrome and the spectrum of cognitive decline. Epidemiologically, we disaggregate the risk profiles of individual components, demonstrating that distinct metabolic phenotypes serve as specific predictors for different phases of impairment. Mechanistically, we propose a sequential pathophysiological cascade where chronic systemic inflammation primes the brain for injury. Surgical stress triggers the failure of a compromised blood brain barrier, leading to the activation of the TLR4/NLRP3 inflammasome and the induction of central insulin resistance. These processes ultimately culminate in mitochondrial energy crises and synaptic degradation. To address these vulnerabilities, we evaluate an integrated perioperative strategy spanning preoperative metabolic optimization, intraoperative management, and emerging pharmacological interventions such as SGLT2 inhibitors and mitochondria targeted antioxidants. Critically, this review identifies a major knowledge gap regarding the absence of dedicated randomized controlled trials targeting the surgical metabolic syndrome population. Ultimately, our findings advocate for a clinical paradigm shift toward phenotype specific metabolic optimization to improve neurocognitive outcomes in these high risk patients.
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