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Related Experiment Video

Updated: Nov 10, 2025

Detection of Anti-MDA5 Autoantibodies Using HeLa Cells and Immunocytochemistry with Light Microscopy

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Statin-Induced Autoimmune Myopathy.

Maryam Nemati¹, Meena Srai¹, Rajani Rudrangi²

¹Internal Medicine, San Joaquin General Hospital, French Camp, USA.

|April 5, 2021

Summary

Statin-induced autoimmune myopathy is a rare condition causing muscle weakness and elevated creatine phosphokinase (CPK). Early diagnosis and treatment with steroids are crucial for recovery.

Area of Science:

Neurology
Immunology
Pharmacology

Background:

Statins are widely used to manage hyperlipidemia.
Myopathy is a known side effect of statin therapy.
Autoimmune variants of myopathy can occur.

Observation:

A 56-year-old female presented with progressive muscle weakness and significantly elevated creatine phosphokinase (CPK).
Initial treatment including statin discontinuation and IV fluids did not resolve the elevated CPK.
The patient exhibited symptoms suggestive of autoimmune myositis.

Findings:

Positive anti-3-hydroxy-3-methylglutaryl-coenzyme A (anti-HMG-CoA) reductase antibody confirmed autoimmune myopathy.
Treatment with high-dose steroids led to gradual improvement in muscle weakness and CPK levels.

Keywords:

myopathy statin statin-associated autoimmune myopathy

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Discontinuation of statin therapy alone was insufficient for recovery.

Implications:

Statin-induced autoimmune myopathy requires high clinical suspicion with elevated CPK levels.
Diagnosis is confirmed by anti-HMG-CoA reductase antibodies and potentially muscle biopsy.
Prompt steroid treatment is essential for managing this condition.