title: Thirty-day outcomes of emergency department patients undergoing electrical cardioversion for atrial fibrillation or flutter.
abstract: OBJECTIVE
  While the short-term (<7-day) safety and efficiency of electrical cardioversion for emergency department (ED) patients with atrial fibrillation or flutter have been established, the 30-day outcomes with respect to stroke, thromboembolic events, or death have not been investigated.
  
  
  METHODS
  A two-center cohort of consecutive ED patients undergoing cardioversion for atrial fibrillation or flutter between January 1, 2000, and September 30, 2007, was retrospectively investigated. This cohort was probabilistically linked with both a regional ED database and the provincial health registry to determine which patients had a subsequent ED visit or hospital admission, stroke, or thromboembolic event or died within 30 days. In addition, trained reviewers performed a detailed chart abstraction on 150 randomly selected patients, with emphasis on demographics, vital signs, medical treatment, and predefined adverse events. Hemodynamically unstable patients or those whose condition was the result of an underlying acute medical diagnosis were excluded. Data were analyzed by descriptive methods.
  
  
  RESULTS
  During the study period, 1,233 patients made 1,820 visits for atrial fibrillation or flutter to the ED. Of the 400 eligible patients undergoing direct-current cardioversion (DCCV), no patients died, had a stroke, or had a thromboembolic event in the following 30 days (95% confidence interval [CI] = 0.0 to 0.8% for all outcomes). A total of 141 patients were included in the formal chart review, with five patients (3.5%, 95% CI = 0.5% to 6.6%) failing cardioversion, six patients (4.3%, 95% CI = 0.9% to 7.6%) having a minor adverse event that did not change disposition, and five patients (3.5%, 95% CI = 0.5% to 6.6%) admitted to hospital at the index visit.
  
  
  CONCLUSIONS
  Cardioversion of patients with atrial fibrillation or flutter in the ED appears to have a very low rate of long-term complications.
authors.affiliation: Department of Emergency Medicine, St Paul's Hospital and the University of British Columbia, Vancouver, BC, USA. frank.scheuermeyer@gmail.com
authors.forename: Frank
authors.initials: F
authors.lastname: Xavier Scheuermeyer
authors.forename: Eric
authors.initials: E
authors.lastname: Grafstein
authors.forename: Rob
authors.initials: R
authors.lastname: Stenstrom
authors.forename: Grant
authors.initials: G
authors.lastname: Innes
authors.forename: Iraj
authors.initials: I
authors.lastname: Poureslami
authors.forename: Maziar
authors.initials: M
authors.lastname: Sighary
mesh_terms: D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000175:diagnosis / Q000401:mortality / Q000628:therapy*; D001282:Atrial Flutter / Q000175:diagnosis / Q000401:mortality / Q000628:therapy*; D001955:British Columbia; D015331:Cohort Studies; D016208:Databases, Factual; D004554:Electric Countershock / Q000379:methods* / Q000401:mortality; D004562:Electrocardiography; D004632:Emergency Medical Services / Q000379:methods; D004636:Emergency Service, Hospital / Q000592:standards*; D005260:Female; D005500:Follow-Up Studies; D006785:Hospitals, University; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D015996:Survival Rate; D013997:Time Factors; D016896:Treatment Outcome