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Coronary angiography and bypass surgery in Manitoba and the United States: a first comparison
1University of Manitoba, Department of Community Health Sciences, Manitoba Centre for Health Policy and Evaluation, Winnipeg.
Insights
Canadian hospitals demonstrated more appropriate use of coronary angiography (CA) and bypass surgery (CABS) in the early 1980s compared to US hospitals. This suggests potentially better resource allocation in Canada during this period.
Area of Science:
- Cardiovascular Medicine
- Health Services Research
- Medical Procedure Appropriateness
Background:
- Procedure rates for coronary angiography (CA) and coronary artery bypass surgery (CABS) were notably lower in Canada than in the US during the early 1980s.
- Understanding the appropriateness of these procedures is crucial for evaluating healthcare efficiency and patient outcomes.
Purpose of the Study:
- To compare the appropriateness of CA and CABS utilization between a Canadian hospital and several American hospitals in the early 1980s.
- To assess if lower procedure rates in Canada correlated with more appropriate use of cardiac interventions.
Main Methods:
- A case-based review using explicit criteria was conducted on patients undergoing CA and CABS.
- Canadian data included 502 Manitoba residents undergoing CA (1981-82) and 245 CABS patients; American data involved 1677 CA patients and CABS patients from three hospitals (1979-82).
- Sensitivity analyses were performed to account for missing exercise electrocardiogram data in the Canadian sample.
Main Results:
- The proportion of inappropriate CA was lower in the Manitoba hospital (9%) compared to American hospitals (15-18%), even with conservative assumptions.
- Only one of the three American hospitals approached the Manitoba hospital's level of appropriateness for CABS utilization.
- A significant number of Canadian patients treated medically after CA met criteria for appropriate CABS, according to American standards.
Conclusions:
- The study indicates more appropriate use of CA and CABS in the analyzed Manitoba hospital versus several US hospitals during the early 1980s.
- The findings raise questions about potential underprovision of necessary cardiac procedures in Canada, despite more appropriate utilization.
- Comparative analysis highlights regional differences in the application of cardiac interventions and their appropriateness.
Objective:
To compare the appropriateness of use of coronary angiography (CA) and bypass surgery (CABS) in the early 1980s in one Canadian hospital and several American hospitals using explicit case-based criteria. Procedure rates were much lower in Canada during this period.
Subjects:
Canadian subjects, 502 Manitoba residents undergoing CA at one hospital in 1981-82 were tracked forward to determine whether and when they underwent CABS. CA comparisons were made with 351 Canadian patients aged 55 years or older; 1677 American CA patients aged 65 years or older and were drawn in 1981 from three hospitals. Two hundred and forty-five patients undergoing CABS within 12 months of CA made up the Canadian sample. American CABS patients were sampled from three hospitals during 1979-82. Manitoba patients assigned to medical treatment after CA were also appraised.
Methods:
Criteria were derived by an American panel of clinicians following a Delphi process; indications were rated appropriate, equivocal and inappropriate. A trained abstractor reviewed charts and assigned ratings. Results of exercise electrocardiograms were not available in the Manitoba data set, hence sensitivity analyses were performed to determine how differing proportions of positive exercise electrocardiograms might affect the Manitoba results.
Results:
Even assuming only 50% of treadmill tests were positive in the Manitoba sample, the proportion of inappropriate CA was lower in Manitoba than for the American hospitals: 9% versus 15 to 18%. For CABS, only one of the three comparison American hospitals approached the Manitoba hospital level of appropriateness.
Conclusions:
In the early 1980s, there was more appropriate use of CA and CABS in a Manitoba hospital compared with several American hospitals. Many Canadian patients undergoing CA and treated medically met American indications for appropriate use of CABS. Whether this represents underprovision of necessary care remains uncertain.