Thyrotoxic Hypokalemic Periodic Paralysis in Colombia: From a Single Case to a Review of the National Experience.

Abstract

Thyrotoxic periodic paralysis (TPP) is a reversible but potentially severe complication of thyrotoxicosis characterized by acute muscle weakness and hypokalemia resulting predominantly from intracellular potassium redistribution. Although classically associated with Asian populations, TPP is increasingly recognized in Latin America. We report a 38-year-old Colombian man with recurrent nocturnal proximal quadriparesis, preserved deep tendon reflexes, serum potassium of 2.3 mEq/L, and biochemical thyrotoxicosis secondary to Graves disease. In parallel, we conducted a structured review of published Colombian cases identified through searches of PubMed/MEDLINE, Scopus, Web of Science, SciELO, and Google Scholar from inception through 1 May 2026. Fourteen previously published cases were identified, yielding 15 cases including the index patient. All patients were male, with a mean age of 31.4 ± 7.4 years. Deep tendon reflexes were normal in 4/13 (30.8%) cases in which they were documented, demonstrating that preserved reflexes do not exclude TPP. TSH was suppressed below 0.05 mIU/L in 14/15 (93.3%) patients. Electrocardiographic findings were reported in only 7/15 cases, and antithyroid drug doses in 6/15, highlighting substantial heterogeneity in reporting. All reported patients recovered muscle strength following acute management. TPP should therefore be considered in patients presenting with acute proximal weakness and hypokalemia even when deep tendon reflexes are preserved or overt manifestations of thyrotoxicosis are absent. Standardized reporting of biochemical, electrocardiographic, therapeutic, and follow-up data is needed to improve characterization of TPP in underrepresented populations.