title: E.C.G. changes after electroconversion.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001146:Arrhythmia, Sinus / Q000503:physiopathology / Q000628:therapy; D001145:Arrhythmias, Cardiac / Q000503:physiopathology* / Q000628:therapy; D004554:Electric Countershock; D004562:Electrocardiography; D006801:Humans; D008875:Middle Aged