Simultaneously developed polymyositis and autoimmune hepatitis

Area of Science:

• Neurology
• Immunology
• Hepatology

Background:

• Polymyositis (PM) and dermatomyositis (DM) are autoimmune inflammatory muscle disorders.
• These conditions are characterized by proximal, symmetrical muscle weakness.

Observation:

• Serum muscle enzymes including creatine kinase (CK), lactate dehydrogenase (LDH), aspartate aminotransferase (AST), and alanine aminotransferase (ALT) are typically elevated in PM and DM.
• Elevated AST, ALT, and LDH without CK measurement can lead to misdiagnosis as hepatic disease.
• Concomitant elevations of AST, ALT, LDH, and CK in patients with PM and DM can be attributed to the myopathy itself, even with coexisting liver injury.

Findings:

• Accurate diagnosis of inflammatory myopathies requires comprehensive enzyme level assessment, including CK.
• Distinguishing myopathy from liver disease is crucial for appropriate treatment.

Implications:

• Proper diagnostic evaluation prevents misdiagnosis and ensures timely, effective treatment for inflammatory myopathies.
• Understanding enzyme profiles aids in managing patients with potential coexisting liver conditions.