Hypokalaemic periodic paralysis: investigations
Written and reviewed by Dr Ibrahim Imam, Consultant Neurologist. Last reviewed .
Hypokalaemic periodic paralysis: investigations. This is usually low in attacks, Many have normal potassium. Fully referenced neurology checklist.
Serum potassium
- This is usually low in attacks
- Many have normal potassium
- Positive potassium challenge
Muscle biopsy: features
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Electromyogram (EMG): McManis test
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References
- Bertorini TE. Neuromuscular Disorders: Treatment and Management. Elsevier Philadelphia 2011 p297-298.
- Venance SL, Cannon SC, Fialho D, et al. The primary periodic paralyses: diagnosis, pathogenesis and treatment. Brain 2006; 129:8-17.
- Meola G, Hanna MG, Fontaine B. Diagnosis and new treatment in muscle channelopathies. JNNP 2009; 80: 360-365.
- Bertorini TE. Neuromuscular Case Studies. Butterworth Heinemann Philadelphia 2008 p 465-468.
- Vivekanandam V, Seutterlin K, Matthews E, et al. Muscle MRI in periodic paralysis shows myopathy is common and correlates with intramuscular fat accumulation. Muscle Nerve 2023 (Online ahead of print).
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