title: Electrocardiographical case. Young man with generalised myalgia.
abstract: A 24-year-old man presented with generalised malaise and myalgia for three days. He presented to the Emergency Department after a fall at his workplace due to weakness. 12-lead electrocardiogram (ECG) showed normal sinus rhythm with ST depression in the leads V4 to V6, with a U wave. The tallest U wave appeared in V3. These ECG features are characteristic of hypokalaemia. ECG changes in hypokalaemia and differential diagnosis are discussed. A second case of thyrotoxic periodic paralysis with similar ECG changes of hypokalaemia is also presented.
authors.affiliation: Department of Emergency Medicine, Singapore General Hospital, Outram Road, Singapore 169608. Adeline_ngo@singhealth.com.sg
authors.forename: A
authors.initials: A
authors.lastname: Ngo
authors.forename: S H
authors.initials: SH
authors.lastname: Lim
authors.forename: R A
authors.initials: RA
authors.lastname: Charles
authors.forename: S H
authors.initials: SH
authors.lastname: Goh
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005221:Fatigue / Q000209:etiology; D006801:Humans; D007008:Hypokalemia / Q000150:complications* / Q000175:diagnosis*; D008297:Male; D009135:Muscular Diseases / Q000209:etiology*; D010146:Pain / Q000209:etiology*