title: Incidence and temporal pattern of hospital readmissions for patients with atrial fibrillation.
abstract: BACKGROUND
  Atrial fibrillation (AF) is prevalent and has a high cost burden. Among the main drivers of cost is inpatient care; however, little is known about patterns of hospital readmissions for AF.
  
  
  OBJECTIVE
  To evaluate the incidence and temporal pattern of readmission in AF patients.
  
  
  METHODS
  This retrospective, cohort analysis used claims data from the Integrated Healthcare Information Systems National Managed Care Benchmark Database for 2002-2006. Patients hospitalized for AF (primary discharge diagnosis) were identified. Data on the first readmission for AF over 1 year following an index hospitalization were analyzed for chronic AF (any AF-related claims in 1 year before index hospitalization) and newly-diagnosed AF patients (no prior AF-related claims).
  
  
  RESULTS
  Overall, 4174 patients hospitalized with primary AF were identified; 1637 had chronic AF and 2537 newly-diagnosed AF. Mean age of chronic AF patients was 62.4 years and 61.2% were male; for newly-diagnosed AF, mean age was 61.4 years and 57.8% were male. In the year following index hospitalization, 12.5% of chronic AF patients were readmitted for AF, with a mean time to readmission of 142.5 days (median 108 days). Among newly-diagnosed AF patients, 10.1% were readmitted for AF, with a mean time to readmission of 133.8 days (median 112 days). For chronic AF, 17.6%, 43.4%, and 65.8% of readmissions occurred within 1, 3, and 6 months, respectively, versus 22.7%, 44.5%, and 67.2%, respectively, for newly-diagnosed AF.
  
  
  CONCLUSIONS
  Limited data were available on patients' clinical profile, treatment patterns, or the reasons for hospitalization/readmission. The term chronic AF only captured patients with a history of AF and data were not available to classify patients according to the presence of paroxysmal, permanent, or persistent AF.
  
  
  CONCLUSIONS
  Patients with newly-diagnosed or chronic AF are often readmitted in the year following hospitalization with most readmissions occurring within 6 months of the index hospitalization.
authors.affiliation: Division of Cardiology, Northwestern University, Feinberg School of Medicine, Chicago, IL 60611, USA. Michael.Kim@nmff.org
authors.forename: M H
authors.initials: MH
authors.lastname: Kim
authors.forename: J
authors.initials: J
authors.lastname: Lin
authors.forename: M
authors.initials: M
authors.lastname: Hussein
authors.forename: D
authors.initials: D
authors.lastname: Battleman