Description

Author: Dylan Luyten , MD

Educational Pearls:

• Rare autosomal dominant condition that is often misdiagnosed as a psychiatric illness.

• Presents as profound muscle weakness with frank paralysis that is often precipitated by vigorous exercise, high carb diet, high sodium load, or by high temperatures.

• Supplemental potassium can rapidly reverse symptoms.

• Important to rule out thyrotoxicosis (get a TSH!).

• Prevention is key: adhering to a low carb and low sodium diet with supplemental potassium can help prevent episodes.

References:

Vicart S, Sternberg D, Arzel-Hézode M, et al. Hypokalemic Periodic Paralysis. 2002 Apr 30 [Updated 2014 Jul 31]. In: Adam MP, Ardinger HH, Pagon RA, et al., editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2018. Available from: https://www.ncbi.nlm.nih.gov/books/NBK1338/?report=classic

Statland JM, Fontaine B, Hanna MG, et al. Review of the Diagnosis and Treatment of Periodic Paralysis. Muscle & Nerve. 2018;57(4):522-530. doi:10.1002/mus.26009.