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Observer variability with conventional and digital subtraction carotid angiograms.
European Journal of Vascular Surgery
|October 1, 1987
Summary
This study compared conventional and digital subtraction angiography for carotid artery stenosis assessment. While digital subtraction angiography showed more variability, it offers a reliable method for estimating stenosis severity.
Area of Science:
- Vascular imaging
- Radiology
- Medical diagnostics
Background:
- Carotid artery stenosis assessment is crucial for stroke risk evaluation.
- Conventional angiography and digital subtraction angiography (DSA) are used for diagnosis.
- Standardizing stenosis measurement is essential for treatment decisions.
Purpose of the Study:
- To evaluate intra- and inter-observer variability in carotid artery stenosis grading.
- To compare conventional angiography and DSA as gold standards for non-invasive test evaluation.
- To determine the reliability of DSA in quantifying stenosis severity.
Main Methods:
- Intra- and inter-observer variability assessment.
- Linear regression analysis for continuous stenosis percentage.
- Kappa analysis for categorized stenosis levels.
- Comparison of conventional angiography versus DSA.
Main Results:
- High correlation coefficients (0.90-0.99) for continuous stenosis measurement.
- Kappa values ranging from 0.53 to 0.91 for categorized stenosis.
- DSA demonstrated greater variability compared to conventional angiography.
- Careful measurement of DSA images provides reliable stenosis estimation.
Conclusions:
- Both conventional and DSA are valuable for carotid stenosis assessment.
- DSA, despite higher variability, can reliably estimate stenosis severity with careful technique.
- Standardized measurement protocols for DSA are recommended for improved consistency.