ALCOHOL USE DISORDER AND NEUROCOGNITIVE IMPAIRMENT: A COMPREHENSIVE NARRATIVE REVIEW OF MECHANISMS, ASSESSMENT, AND RECOVERY TRAJECTORIES

Abstract

Background: Alcohol use disorder (AUD) represents a major global health burden associated with substantial neurocognitive impairment affecting executive function, memory, attention, and decision-making. Despite decades of research, the mechanisms underlying alcohol-related cognitive dysfunction, optimal assessment approaches, and factors influencing recovery remain incompletely understood.

Aim: This narrative review aimed to: (i) characterize the phenomenology and patterns of neurocognitive impairment in AUD; (ii) examine proposed pathophysiological mechanisms including neurotoxicity, neuroinflammation, thiamine deficiency, and neurodevelopmental factors; (iii) evaluate neuroimaging findings across structural, functional, and metabolic modalities; (iv) review assessment approaches and their clinical utility; (v) synthesize evidence regarding neurocognitive recovery trajectories following abstinence; (vi) analyze factors predicting recovery versus persistent impairment; and (vii) identify implications for treatment and future research directions.

Methods: Comprehensive literature review of peer-reviewed publications examining neurocognitive function in AUD, with emphasis on longitudinal studies, neuroimaging investigations, and mechanistic research.

Results: Alcohol-related neurocognitive impairment manifests across multiple domains with executive dysfunction, memory deficits, and impaired decision-making representing cardinal features. Proposed mechanisms include direct neurotoxic effects of alcohol and its metabolites, neuroinflammation, oxidative stress, thiamine deficiency, glutamate excitotoxicity, altered neuroplasticity, and neurodevelopmental disruption. Neuroimaging demonstrates grey matter volume loss, white matter degradation, altered functional connectivity, and metabolic abnormalities particularly affecting frontal cortex, limbic structures, and cerebellum. Recovery occurs in many individuals following sustained abstinence, though trajectories vary substantially. Early abstinence (first 3 months) shows maximal neurobiological and cognitive improvement. Factors predicting favorable recovery include younger age, shorter drinking duration, higher baseline cognitive reserve, absence of liver disease, adequate nutrition, and sustained abstinence. However, some individuals demonstrate persistent deficits despite prolonged sobriety. Assessment challenges include distinguishing primary alcohol effects from premorbid vulnerabilities, psychiatric comorbidities, and other substance effects.

Conclusion: Neurocognitive impairment represents a core feature of AUD with profound implications for treatment engagement, relapse risk, and functional outcomes. While significant recovery potential exists, individual variability necessitates personalized approaches to assessment and intervention. Critical gaps remain regarding optimal assessment tools, biomarkers predicting recovery, mechanisms underlying individual differences, and effective cognitive remediation strategies. Future research should emphasize longitudinal designs, multimodal neurobiological assessment, investigation of sex differences, and development of precision medicine approaches matching interventions to individual recovery profiles.