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Transcranial Doppler: preventing stroke during carotid endarterectomy
1Department of Surgery, Leicester Royal Infirmary.
Annals of the Royal College of Surgeons of England
|April 21, 1999
Summary
Transcranial Doppler monitoring (TCD) during carotid endarterectomy (CEA) can detect emboli. Particulate emboli, unlike air bubbles, indicate risks of stroke and cognitive decline, enabling early intervention.
Area of Science:
- Neurology
- Vascular Surgery
- Medical Monitoring
Background:
- Carotid endarterectomy (CEA) reduces stroke risk in severe internal carotid artery stenosis.
- Perioperative stroke/death rates remain around 5%, with thromboembolism as a primary cause.
- Existing monitoring methods fail to detect the source of perioperative strokes.
Purpose of the Study:
- To determine the clinical relevance of transcranial Doppler (TCD) detected emboli during CEA.
- To differentiate between air and particulate emboli and correlate them with clinical outcomes.
- To investigate if TCD monitoring can predict adverse events like stroke.
Main Methods:
- Prospective study of 100 patients undergoing CEA.
- Real-time TCD monitoring for emboli detection during surgery.
- Categorization of emboli as air or particulate.
- Comprehensive pre- and post-operative clinical assessments, including neurological, cognitive, and imaging evaluations.
Main Results:
- Embolization detected in 92% of monitored CEAs.
- Air microbubbles were common and not linked to adverse events.
- Particulate emboli, detected during dissection and after flow restoration, correlated with neurological and cognitive deficits.
- Persistent particulate embolization post-restoration predicted carotid artery thrombosis and stroke.
Conclusions:
- TCD is effective in detecting intraoperative emboli during CEA.
- Particulate emboli are clinically significant indicators of potential stroke.
- Early intervention guided by TCD findings of persistent embolization can prevent stroke.