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The etiology of symptoms in patients with recurrent carotid stenosis
Insights
Recurrent carotid stenosis can stem from atherosclerosis or neointimal hyperplasia. Embolic events, not just reduced blood flow, frequently cause symptoms in these patients.
Area of Science:
- Vascular Surgery
- Neurology
- Pathology
Background:
- Recurrent carotid stenosis poses a significant risk for cerebrovascular events.
- Understanding the underlying pathology of recurrent stenosis is crucial for effective management.
Purpose of the Study:
- To investigate the histopathologic characteristics of recurrent carotid stenosis.
- To determine the primary causes of neurologic symptoms in patients with recurrent carotid stenosis.
Main Methods:
- Retrospective analysis of 33 carotid endarterectomies in 29 patients.
- Histologic examination to classify lesions as recurrent atherosclerosis (RA), neointimal fibromuscular hyperplasia (NFH), or complex.
- Correlation of lesion type with time to recurrence and clinical presentation.
Main Results:
- Neointimal fibromuscular hyperplasia (NFH) was common in early recurrences (<3 years).
- Late recurrences (≥3 years) showed a mix of atherosclerosis and NFH.
- Focal neurologic symptoms occurred in 76% of cases, with embolic sources identified in 64% of symptomatic patients.
Conclusions:
- Both atherosclerosis and NFH contribute to recurrent carotid stenosis.
- Embolic events are a more frequent cause of symptoms than previously thought.
- This highlights the importance of addressing embolic potential in managing recurrent carotid stenosis.
Abstract:
We performed 33 carotid endarterectomies in 29 patients for recurrent carotid stenosis. The interval between the initial and second operations ranged from six weeks to 11 years with a mean of 56 months. Three types of pathologic lesions were identified: (1) recurrent atherosclerosis (RA), (2) neointimal fibromuscular hyperplasia (NFH), and (3) lesions with elements of both RA and NFH (complex lesions). Histologic examination of early-recurring lesions (less than three years) revealed NFH in 17 patients and one complex lesion. Late-recurring lesions (three years or later) were due to atherosclerosis in eight vessels, NFH in four, and both RA and NFH in three. Focal neurologic symptoms occurred in 25 (76%) of 33 vessels, and an embolic source could be identified in 16 (64%) of 25 patients. Embolic events rather than reduced blood flow due to progressive stenosis are more frequent causes of symptoms in patients with recurrent carotid stenosis than was formerly believed.