Proximal myopathy: causes and associated conditions.

Area of Science:

• Neurology
• Endocrinology
• Genetics

Background:

• Proximal myopathy is characterized by generalized muscle weakness affecting limb muscles.
• Various factors, including toxins, medications, endocrine disorders, and inflammatory conditions, are implicated in its development.
• Idiopathic inflammatory myopathies and hereditary myopathies represent significant categories of this condition.

Purpose of the Study:

• To provide a comprehensive review of the diverse causes and associated conditions of proximal myopathy.
• To summarize recent developments in understanding the pathophysiology of generalized muscle weakness.
• To consolidate existing literature on proximal myopathy for a detailed overview.

Main Methods:

• Narrative review of existing literature.
• Synthesis of information on toxins, medications, endocrine, metabolic, inflammatory, hereditary, and viral causes.
• Detailed discussion of specific myopathies like inclusion body myositis and muscular dystrophies.

Main Results:

• Proximal myopathy has a complex pathophysiology with numerous potential triggers.
• Causes range from drug-induced myopathies (statins, corticosteroids) and toxins to endocrine dysfunctions (adrenal, thyroid, pituitary).
• Inflammatory myopathies (polymyositis, dermatomyositis, inclusion body myositis), hereditary myopathies (muscular dystrophies), metabolic disorders (glycogen storage, lipid deposition), viral infections, and sarcoidosis are significant contributors.

Conclusions:

• Proximal myopathy is a multifactorial condition with a broad spectrum of causes.
• Understanding these diverse etiologies is crucial for accurate diagnosis and management of generalized muscle weakness.
• This review serves as a detailed resource on the conditions associated with proximal myopathy.