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What are the indications for a carotid duplex scan?
R J Holdsworth1, P T McCollom, P A Stonebridge
1Department of Vascular Surgery, Ninewells Hospital and Medical School, Dundee, UK.
Clinical Radiology
|November 1, 1996
Summary
Many carotid duplex scans detect no significant carotid arterial disease, despite increasing requests for stroke prevention investigations. A retrospective analysis was performed to assess referral indications and reduce unnecessary scans.
Area of Science:
- Vascular Surgery
- Neurology
- Diagnostic Imaging
Background:
- Carotid duplex scanning is a non-invasive method for detecting extracranial carotid arterial disease.
- Increased awareness of carotid disease-stroke association and carotid endarterectomy benefits drives rising investigation requests.
- The Dundee Vascular Laboratory faces an increasing workload on limited resources due to high demand for carotid duplex scans.
Purpose of the Study:
- To analyze referral indications for carotid duplex scans over five years.
- To determine if the number of new requests for carotid duplex scans can be reduced.
- To optimize resource allocation for vascular investigations.
Main Methods:
- Retrospective analysis of referral indications for carotid duplex scans.
- Review of data from the Dundee Vascular Laboratory over a five-year period.
- Categorization of scan results, including degree of stenosis and presence of abnormalities.
Main Results:
- In 1994, 66.9% of 1389 carotid examinations showed no significant abnormality or less than 50% stenosis.
- Of 1052 new requests, 79.1% fell into the same category (no significant abnormality or <50% stenosis).
- A high proportion of scans were requested for indications that did not reveal significant carotid arterial disease.
Conclusions:
- A significant number of carotid duplex scans are performed for conditions without significant carotid arterial disease.
- There is a potential to reduce the number of new requests for carotid duplex scans.
- Optimizing referral criteria could alleviate the burden on vascular laboratory resources.