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Classification
| | | | | | | Proximal Weakness | | | | | | |
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| | | Myopathic | | | | | | Non-Myopathic | | |
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| Acquired | | Genetic | | | | | | | | | |
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| - Inflammatory myositis
- Polymyositis
- dermatomyositis
- immune mediated necrotising myopathy
- Endocrine - e.g cushings, dysthyroid
Drugs- Hyper/hypokalaemia
| | | | | | - Peripheral neuropathies with proximal weakness - vasculitis or CIDP
- Plexopathies e.g. diabetic amyotrophy
- Infiltration nerve root - neoplastic meningitis
- Myelopathy
- Neuromuscular junction - Lambert Eaton myaesthenic syndrome
- Anterior horn cell - spinal muscular atrophies if chronic, motor neuron disease if subacute and progressive
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