Hypokalaemic periodic paralysis: investigations

Evidence-based neurology checklist on hypokalaemic periodic paralysis: investigations: Serum potassium This is usually low in attacks Many have normal potassium Positive potassium challenge Muscle biopsy: features Electromyogram (EMG): McManis test

Serum potassium

  • This is usually low in attacks
  • Many have normal potassium
  • Positive potassium challenge

Muscle biopsy: features

Electromyogram (EMG): McManis test

References

  1. Bertorini TE. Neuromuscular Disorders: Treatment and Management. Elsevier Philadelphia 2011 p297-298.
  2. Venance  SL, Cannon SC, Fialho D, et al. The primary periodic paralyses: diagnosis, pathogenesis and treatment. Brain 2006; 129:8-17.
  3. Meola G, Hanna MG, Fontaine B. Diagnosis and new treatment in muscle channelopathies. JNNP 2009; 80: 360-365.
  4. Bertorini TE. Neuromuscular Case Studies. Butterworth Heinemann Philadelphia 2008 p 465-468.
  5. 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).
  6. And 1 more. Subscribe to see the full list

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