The arrhythmia that converted spontaneously in the ER.
D000368:Aged; D001281:Atrial Fibrillation / Q000175:diagnosis* / Q000188:drug therapy; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D004562:Electrocardiography; D004630:Emergencies; D005260:Female; D006801:Humans; D014927:Wolff-Parkinson-White Syndrome / Q000175:diagnosis / Q000188:drug therapy