Kurtulmus, NeslihanCelik, Seden Erten2023-02-212023-02-212013-01-0110.1016/j.jacme.2013.01.005https://hdl.handle.net/11443/1711http://dx.doi.org/10.1016/j.jacme.2013.01.005A 29-year-old Caucasian man with a history of Graves' disease for 6 weeks presented to our emergency department at midnight with muscle weakness. He had woken up after 1e2 hours of sleep with weakness in his lower extremities. Electrocardiography (ECG) showed atrial fibrillation. His potassium level was 2.6 mEq/L. His ECG was monitored, and potassium chloride mixed with a normal saline infusion (20 mEq/L) was given for 1 hour. After his potassium level returned to normal (4.63 mEq/L), clinical improvement was noted. The ECG showed sinus rhythm. Clinicians should consider thyrotoxic periodic paralysis in patients with hypokalemia and paralysis, even though it is rare in Caucasians. Copyright (C) 2013, Taiwan Society of Emergency Medicine. Published by Elsevier Taiwan LLC. All rights reserved.Atrial fibrillationHypokalemiaParalysisThyrotoxic periodic paralysis (TPP)ArticleWOS:000218895800005