Thyrotoxic Periodic Paralysis in a Pediatric PatientJones, Peter III MD; Papadimitropoulos, Laura MD; Tessaro, Mark O. MDPediatric Emergency Care: January 2014 - Volume 30 - Issue 1 - p 35–37 doi: 10.1097/PEC.0000000000000033 Illustrative Cases Abstract Author Information Thyrotoxic periodic paralysis is a reversible metabolic disorder that is characterized by acute muscle weakness and hypokalemia. It predominantly affects males of Asian descent. We describe the youngest such patient yet reported, a 13-year-old Asian male with a history of transient attacks of weakness who presented to our emergency department with weakness in his extremities and mild tachycardia. Laboratory test results initially revealed marked hypokalemia and later confirmed associated hyperthyroidism. Correction of the hypokalemia reversed the patient’s weakness in the emergency department. From the Maimonides Medical Center, Brooklyn, NY. Disclosure: The authors declare no conflict of interest. Reprints: Peter Jones III, MD, Maimonides Medical Center, 4802 Tenth Ave, Brooklyn, NY 11219 (e-mail: firstname.lastname@example.org). © 2014 Lippincott Williams & Wilkins, Inc.