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Carotid endarterectomy: the mandate for high quality duplex
J R Elmore1, D P Franklin, D D Thomas
1Section of Vascular Surgery, Geisinger Medical Center, Danville, Pennsylvania 17822, USA.
Annals of Vascular Surgery
|March 26, 1998
Summary
Accuracy of outside carotid duplex scans is questionable, potentially leading to unnecessary surgeries. Repeat duplex scans are crucial before clinical decisions to ensure patient safety and appropriate treatment for carotid artery disease.
Area of Science:
- Vascular Surgery
- Diagnostic Imaging
- Medical Device Technology
Background:
- Carotid duplex scanning is increasingly used for carotid endarterectomy decisions, sometimes replacing angiography.
- The accuracy of duplex scans performed outside dedicated vascular laboratories requires validation.
Purpose of the Study:
- To assess the accuracy of outside carotid duplex scans compared to a dedicated vascular lab.
- To evaluate the impact of inaccurate scans on clinical decisions for carotid endarterectomy.
Main Methods:
- Retrospective analysis of 76 patients with prior outside carotid duplex scans.
- Repeat carotid duplex studies performed at a dedicated vascular laboratory.
- Comparison of outside scan results with repeat studies and angiography.
Main Results:
- Outside carotid duplex scans significantly overestimated stenosis severity (p = 0.003) with poor agreement (weighted kappa = 60.2%).
- Inaccurate outside scans could lead to unnecessary surgeries in 61.5% for 80%-99% stenoses or denied appropriate surgery in 7.6% for 60%-99% stenoses.
- The dedicated lab demonstrated 93.8% overall accuracy validated by angiography.
Conclusions:
- Failure to validate duplex scan accuracy from non-dedicated labs can result in inappropriate angiography or surgery.
- Repeat duplex studies are mandatory before clinical decisions when outside scan quality is unconfirmed.
- Carotid endarterectomy without angiography requires prior validation of duplex scan accuracy.