title: Trends in the utilization of noninvasive cardiac diagnostic tests in Ontario from fiscal year 1989/90 to 1992/93.
abstract: OBJECTIVE
  To describe pattern of utilization of noninvasive cardiac diagnostic test in Ontario.
  
  
  METHODS
  Retrospective analysis using Ontario Health Insurance Plan (OHIP) administrative data.
  
  
  METHODS
  Ambulatory care settings in Ontario.
  
  
  METHODS
  First, the volume of services and expenditures on electrocardiograms (ECG), ambulatory ECG, radionuclide angiocardiograms (RNA), echocardiograms, exercise stress tests (EST), and myocardial perfusion scintigrams from 1989/90 to 1992/93; second, the number and specialty of physicians performing these tests.
  
  
  RESULTS
  Ontario spent $119 million on noninvasive diagnostic cardiology test in 1992/93, representing 2.67% of total OHIP expenditures. Expenditures on these procedures grew by 49.3 % over the four-year period, exceeding the overall OHIP growth rate, and was most rapid for nuclear cardiology and echocardiography. Changing demographics accounted fpr only a minor portion of expenditure growth. Second, age-adjusted utilization rates for EST, myocardial perfusion scintigraphy and RNA were higher for men, but sex differences tended to diminish over time. Third, utilization rates differed markedly by geographic region, and variations were greatest for nuclear medicine studies. Geographic variations tended to be attenuated over time. There was also wide variation in the frequency with which physicians performed Doppler studies with two-dimensional echocardiography.
  
  
  CONCLUSIONS
  The use of noninvasive cardiac diagnostic test has grown rapidly in recent years. This growth may have been influenced by practice guidelines, by greater diffusion of, and access to, newer technology and by more testing in women. Wide regional variations suggest that clearer practice guidelines are needed concerning the appropriate use of noninvasive cardiac diagnostic investigations.
authors.affiliation: Institute for Clinical Evaluative Sciences, Ontario, Canada.
authors.forename: B
authors.initials: B
authors.lastname: Chan
authors.forename: J L
authors.initials: JL
authors.lastname: Cox
authors.forename: G
authors.initials: G
authors.lastname: Anderson
mesh_terms: D000790:Angiocardiography / Q000379:methods; D003952:Diagnostic Imaging / Q000379:methods* / Q000639:trends; D004452:Echocardiography; D004562:Electrocardiography; D015716:Electrocardiography, Ambulatory; D005080:Exercise Test; D005260:Female; D006331:Heart Diseases / Q000175:diagnosis*; D006801:Humans; D008297:Male; D009864:Ontario; D011875:Radionuclide Angiography; D013223:Statistics as Topic