title: Descriptive epidemiology of agranulocytosis.
abstract: BACKGROUND
  To determine the incidence of agranulocytosis, a descriptive epidemiologic study was performed.
  
  
  METHODS
  With the use of computerized Medicaid billing data from 1980 through 1985 from Minnesota, Michigan, and Florida, the ratio of persons hospitalized with a discharge diagnosis of neutropenia to persons with any claim for medical service was first used as an estimate of the incidence rate of the condition. Patients with cancer and patients receiving cytotoxic and immunosuppressive drugs were excluded. The information provided by a review of medical records for a subset of neutropenia cases was used to determine the proportion with neutropenia after excluding cases with recurrent or chronic neutropenia, and to determine the proportion with agranulocytosis.
  
  
  RESULTS
  The incidence rates (95% confidence intervals) of agranulocytosis, excluding recurrent or chronic disease, were 2.3 (1.4 to 3.7), 7.7 (6.6 to 8.9), and 15.4 (11.3 to 20.4) per million per year in each state, respectively. The overall incidence was 7.2 (6.3 to 8.1) per million per year.
  
  
  CONCLUSIONS
  Agranulocytosis is an extremely uncommon condition. The excess risk of agranulocytosis due to any drug other than cytotoxic drugs must, therefore, be very low.
authors.affiliation: Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104-6095.
authors.forename: B L
authors.initials: BL
authors.lastname: Strom
authors.forename: J L
authors.initials: JL
authors.lastname: Carson
authors.forename: R
authors.initials: R
authors.lastname: Schinnar
authors.forename: E S
authors.initials: ES
authors.lastname: Snyder
authors.forename: M
authors.initials: M
authors.lastname: Shaw
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000380:Agranulocytosis / Q000097:blood / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged; D009862:Online Systems; D012008:Recurrence; D014481:United States / Q000453:epidemiology