Identifying the high-risk patient with clinically relevant embolisation after carotid endarterectomy
R Y Sharpe1, J Walker, M J Bown
1The Vascular Studies Unit, Leicester Royal Infirmary, Leicester, UK.
Insights
Early detection of emboli after carotid endarterectomy (CEA) using transcranial Doppler (TCD) identifies high-risk patients. This allows targeted Dextran therapy, preventing stroke and reducing monitoring for most patients.
Area of Science:
- Vascular Surgery
- Neurology
- Medical Monitoring
Background:
- Carotid endarterectomy (CEA) carries a risk of stroke due to post-operative carotid thrombosis (POCT).
- Transcranial Doppler (TCD) monitoring can guide Dextran therapy to prevent stroke, but it is labor-intensive.
- Identifying high-risk patients early can optimize monitoring and treatment allocation.
Purpose of the Study:
- To determine if a 30-minute TCD monitoring period can identify a high-risk cohort after CEA.
- To reduce the overall monitoring burden for patients undergoing CEA.
- To assess the efficacy of TCD-directed Dextran therapy in preventing POCT-related strokes.
Main Methods:
- Retrospective audit of prospectively acquired data from 821 patients undergoing CEA.
- Utilized 3-hour TCD monitoring post-CEA, with Dextran administered for >25 emboli/10 min or large emboli.
- Focused analysis on emboli detection within the initial 30 minutes of recovery monitoring.
Main Results:
- 85% of patients (Group 1) had ≤10 emboli in the first 30 minutes, requiring no Dextran and experiencing no strokes or re-explorations.
- 15% of patients (Group 2) had 11+ emboli, with 20% requiring Dextran; none suffered POCT strokes, though 2 had embolic strokes despite treatment.
- Mitigating factors were identified for the two stroke cases where optimal Dextran doses were not administered.
Conclusions:
- TCD-directed Dextran therapy has effectively eliminated stroke due to POCT.
- A 30-minute TCD monitoring period in the recovery area can reliably identify patients at high risk for excessive embolization.
- The majority of patients (85%) do not require extended monitoring, streamlining post-CEA care.
Objectives:
Sustained embolisation after carotid endarterectomy (CEA) predicts an increased risk of stroke due to post-operative carotid thrombosis (POCT). Progression towards stroke can be prevented by transcranial Doppler (TCD) directed intravenous Dextran therapy. However, TCD monitoring is extremely labour intensive. The aim of this study was to see whether a small cohort of high-risk patients could be identified following a 30-min period of monitoring in the Recovery Area of the operating theatre so as to reduce the overall burden of monitoring for the majority of patients.
Methods:
Retrospective audit of prospectively acquired data in 821 patients with an accessible temporal window who had undergone 3h of TCD monitoring after CEA. Patients with >25 emboli in any 10 min period or large emboli distorting the waveform received Dextran.
Results:
Group 1: 694 patients (85%) with
Conclusions:
TCD directed Dextran has abolished stroke due to POCT. A high-risk cohort of patients requiring Dextran can be identified by measuring the magnitude of embolisation in the first 30 min in Theatre Recovery. The vast majority of patients (85%) require no further monitoring.
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