title: Venous thromboembolism according to age: the impact of an aging population.
abstract: BACKGROUND
  With the aging of the US population, there is concern that the rate of venous thromboembolism will increase, thereby increasing the health burden. In this study we sought to determine trends in the diagnosis of deep venous thrombosis (DVT) and pulmonary embolism (PE) in the elderly as well as the use of diagnostic tests.
  
  
  METHODS
  Data from the National Hospital Discharge Survey were used. These data are abstracted each year from a sample of records of patients discharged from non-federal short-stay hospitals in the entire United States. Main outcome measures were trends in rates of diagnosis of DVT and PE as well as trends in the use of diagnostic tests between 1979 and 1999.
  
  
  RESULTS
  The rates of diagnosis of DVT and PE and of the use of diagnostic tests over 21 years were markedly higher in elderly than in younger patients (P<.001). Although the rate of diagnosed DVT in elderly patients strikingly increased over the past decade (P< .001), that of PE has been relatively constant. There was a proportionately greater use of venous ultrasonography, ventilation-perfusion lung scanning, and pulmonary angiography in elderly than in younger patients.
  
  
  CONCLUSIONS
  Extensive use of diagnostic tests in elderly patients in the past decade has resulted in an increased diagnostic rate for DVT but not PE. The reason for this disparity is uncertain but may reflect early diagnosis and treatment of DVT. With the aging of the population, DVT will increase the health burden.
authors.affiliation: Department of Research, St Joseph Mercy Oakland Hospital, Pontiac, Mich. 48341-3244, USA. steinp@trinity-health.org
authors.forename: Paul D
authors.initials: PD
authors.lastname: Stein
authors.forename: Russell D
authors.initials: RD
authors.lastname: Hull
authors.forename: Fadi
authors.initials: F
authors.lastname: Kayali
authors.forename: William A
authors.initials: WA
authors.lastname: Ghali
authors.forename: Andrew K
authors.initials: AK
authors.lastname: Alshab
authors.forename: Ronald E
authors.initials: RE
authors.lastname: Olson
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology; D000792:Angiography / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011336:Probability; D011379:Prognosis; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging* / Q000453:epidemiology*; D012042:Registries; D012189:Retrospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D017678:Sex Distribution; D015996:Survival Rate; D020246:Venous Thrombosis / Q000000981:diagnostic imaging* / Q000453:epidemiology*