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The potential for a selective screening strategy for abdominal aortic aneurysm.
C A Spencer1, K Jamrozik, P E Norman
1Department of Public Health, University of Western Australia, Nedlands. carole@dph.uwa.edu.au
Journal of Medical Screening
|February 24, 2001
Summary
Selective screening for abdominal aortic aneurysm (AAA) in men aged 65-83 is feasible but misses about 25% of cases. Targeting half the population finds most AAAs, while targeting smokers finds few.
Area of Science:
- Vascular Surgery
- Public Health Screening
- Epidemiology
Background:
- Abdominal aortic aneurysm (AAA) is a significant vascular condition.
- Effective screening strategies are crucial for early detection and intervention.
- Current screening guidelines may not be optimal for identifying all at-risk individuals.
Purpose of the Study:
- To assess the feasibility of selective screening for abdominal aortic aneurysm (AAA).
- To identify a target group for AAA screening based on risk factors.
- To determine the effectiveness of risk factor-based screening strategies.
Main Methods:
- A randomized controlled trial involving male residents aged 65-83 in Western Australia.
- Development of a multivariate risk score based on questionnaire data and physical examination.
- Calculation of sensitivity and specificity for various selective screening strategies based on risk score centiles.
- Analysis of AAA detection rates for different screening approaches.
Main Results:
- Screening 50% of the eligible male population identified approximately 75% of abdominal aortic aneurysms (AAAs).
- Screening only current smokers identified only about 20% of AAAs.
- Selective screening based on risk factors is feasible but imperfect.
Conclusions:
- Selective screening for AAA using identifiable risk factors is possible.
- However, this approach is not considered worthwhile due to missing approximately 25% of clinically significant AAAs.
- Broader screening or alternative strategies may be necessary to capture all significant cases.