Alcoholic Myopathy

AI Summary

Alcoholic myopathy is common and underdiagnosed, occurring as acute (binge) or chronic (long-term heavy drinking) forms.
Pathophysiology involves direct ethanol toxicity, inhibited mTOR signalling, ubiquitin-proteasome hyperactivation, mitochondrial dysfunction, and impaired satellite-cell regeneration.
Diagnosis: muscle biopsy shows selective type 2 fibre atrophy; treatment relies on strict abstinence, with no established pharmacological therapy yet.

TL;DR (AI Generated)

Recent molecular studies have elucidated the involvement of multifaceted mechanisms, including impaired protein anabolism via inhibition of the mTOR signaling pathway, accelerated catabolism through hyperactivation of the ubiquitin-proteasome system, mitochondrial dysfunction, and decreased regenerative capacity of satellite cells.

In clinical practice, however, initiating strict abstinence based on a detailed drinking history and confirming subsequent muscle strength recovery provide a highly practical diagnostic and therapeutic approach.

Currently, no pharmacological therapy has been established, making complete abstinence the most reliable therapeutic approach; nevertheless, the identification of novel therapeutic targets based on the specific pathophysiology is highly anticipated.

Basic summary

Brain Nerve. 2026 Nov;78(11):1201-1207. doi: 10.11477/mf.188160960780111201.

ABSTRACT

Alcoholic myopathy is a major physical complication of alcohol use disorder, occurring at a substantially higher incidence than liver cirrhosis, although it is often underdiagnosed. Clinically, it is broadly classified into an acute form triggered by binge drinking and a chronic form that progresses insidiously due to long-term heavy alcohol consumption. The underlying pathophysiology involves not only secondary factors such as malnutrition and vitamin deficiency but also, primarily, the direct toxicity of ethanol and its metabolites to skeletal muscle. Recent molecular studies have elucidated the involvement of multifaceted mechanisms, including impaired protein anabolism via inhibition of the mTOR signaling pathway, accelerated catabolism through hyperactivation of the ubiquitin-proteasome system, mitochondrial dysfunction, and decreased regenerative capacity of satellite cells. Muscle biopsy is recommended for a definitive diagnosis, with selective type 2 fiber atrophy being characteristic of the chronic form. In clinical practice, however, initiating strict abstinence based on a detailed drinking history and confirming subsequent muscle strength recovery provide a highly practical diagnostic and therapeutic approach. Currently, no pharmacological therapy has been established, making complete abstinence the most reliable therapeutic approach; nevertheless, the identification of novel therapeutic targets based on the specific pathophysiology is highly anticipated.

PMID:43014725 | DOI:10.11477/mf.188160960780111201

Document this CPD