Alcoholic skeletal myopathy, a clinical and pathological study

Area of Science:

• Neurology
• Toxicology

Background:

• Chronic heavy alcohol intake is prevalent.
• Alcohol's impact on skeletal muscle is not fully understood.
• Existing research often overlooks direct muscle toxicity.

Purpose of the Study:

• To investigate the prevalence and nature of skeletal muscle disease in chronic alcohol consumers.
• To determine if other alcohol-related conditions explain muscle abnormalities.
• To assess the effect of alcohol abstinence on muscle health.

Main Methods:

• Histological examination of quadriceps muscle biopsies from 151 inpatients with heavy alcohol intake history.
• Clinical assessment for symptoms, peripheral neuropathy, cirrhosis, and malnutrition.
• Serum creatine kinase activity measurement.
• Follow-up studies after alcohol abstinence.

Main Results:

• 60% of patients exhibited abnormal muscle biopsies, primarily type II muscle fibre atrophy.
• Acute myopathy and rhabdomyolysis were observed in a small percentage.
• Cirrhosis, malnutrition, and neuropathy did not fully explain muscle abnormalities.
• Serum creatine kinase was an insensitive marker for alcoholic myopathy.
• Alcohol abstinence led to consistent muscle function improvement, while continued use worsened atrophy.

Conclusions:

• Chronic skeletal myopathy is a common consequence of alcohol abuse.
• Ethanol likely exerts a direct toxic effect on muscle fibres.
• Muscle function recovery is possible with abstinence, independent of neuropathy recovery.