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Thyrotoxic periodic paralysis complicated by syncope: results after potassium and magnesium treatment (ECG)

Electrocardiogram of a 22-year-old man with thyrotoxic periodic paralysis complicated by syncope. His initial electrocardiogram during an episode showed sinus bradycardia (55 bpm) with incomplete right bundle branch block, and after intravenous atropine this evolved to an accelerated junctional rhythm, a corrected QT interval of 614ms, and an incomplete right bundle branch block. After treatment with intravenous potassium and intravenous magnesium due to his prolonged QT interval, his symptoms resolved completely within 12 hours. Most of his electrocardiogram changes resolved after correction of his hypokalemia, leaving normal sinus rhythm with a first-degree atrioventricular block. (Source: Dosu A, Gupta M, Walsh O, Makan J. Thyrotoxic periodic paralysis: case presentation with tetraparesis and cardiac dysrhythmia. Cureus 2022;14[9]:e29759. Creative Commons Attribution [CC-BY 4.0] license,

Associated Disorders

  • Endocrine ophthalmopathy
  • Graves disease
  • Graves ophthalmopathy
  • Hashimoto thyroiditis
  • Hoffmann syndrome
  • Hyperthyroid myopathy
  • Hypothalamic dysfunction
  • Hypothyroid myopathy
  • Kocher-Debre-Semelaigne syndrome
  • Pituitary dysfunction
  • Thyroid-associated ophthalmopathy
  • Thyrotoxic myopathy
  • Thyrotoxic ocular myopathy