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Characterisation of carotid artery disease: comparison of duplex scanning with histology
Insights
Duplex scanning can accurately assess internal carotid artery stenosis when combining B-mode imaging and Doppler. However, B-mode alone has limitations in characterizing plaque components and detecting ulceration in atheromatous lesions.
Area of Science:
- Vascular Surgery
- Diagnostic Imaging
- Histopathology
Background:
- Atheromatous lesions in the internal carotid artery (ICA) are a major cause of stroke.
- Accurate characterization of plaque components and stenosis severity is crucial for treatment decisions.
Purpose of the Study:
- To evaluate the capability of duplex scanning to characterize atheromatous plaque components and detect ulceration in the ICA.
- To assess the reliability of B-mode imaging and duplex scanning in grading ICA stenosis.
Main Methods:
- Histological examination of 42 carotid endarterectomy specimens.
- Correlation of histological findings with B-mode imaging and duplex scanning data.
Main Results:
- B-mode imaging reliably characterized only calcification within atheromatous lesions.
- Ulceration, thrombus, fibrous intimal thickening, and necrosis were not reliably detected by B-mode imaging.
- B-mode imaging alone could not accurately grade >50% ICA stenosis, but duplex scanning provided accurate results.
Conclusions:
- Duplex scanning, combining B-mode and Doppler, is effective for assessing ICA stenosis.
- B-mode imaging has limitations in characterizing non-calcified plaque components and detecting ulceration.
- Accurate grading of ICA stenosis requires the integration of Doppler ultrasound with B-mode imaging.
Abstract:
The ability of duplex scanning to characterise the component tissue of atheromatous lesions of the internal carotid artery and to detect ulceration has been examined in a histological study of 42 carotid endarterectomy specimens. The results suggest that the only component of atheromatous lesions of the internal carotid artery which can be characterised from the B-scan is calcification. The presence of ulceration, intraluminal and intramural thrombus, fibrous intimal thickening and necrosis are not related to the echogenic appearance of internal carotid stenoses and may not be detected reliably. B-mode imaging alone cannot reliably grade greater than 50% internal carotid stenoses, but when this is combined with pulsed Doppler in the technique of duplex scanning, accurate results may be obtained.