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Transcranial Doppler in carotid endarterectomy
1Department of Neurosurgery, Royal Prince Alfred Hospital, Camperdown, NSW, Australia.
Summary
Transcranial Doppler (TCD) monitoring aids carotid endarterectomy by detecting cerebral ischemia and emboli in real-time. This technology helps manage complications, including effective treatment of high embolic loads with Dextran-40.
Area of Science:
- Neurosurgery
- Vascular Surgery
- Neurology
Background:
- Carotid endarterectomy (CEA) is a procedure to remove plaque from carotid arteries.
- Cerebral ischemia and emboli are significant complications during CEA.
- Monitoring cerebral blood flow is crucial for patient safety.
Purpose of the Study:
- To evaluate the role of transcranial Doppler (TCD) monitoring in reducing CEA complications.
- To analyze perioperative intracerebral blood flow velocity changes.
- To assess embolic load and the effect of Dextran-40 therapy.
Main Methods:
- Retrospective case series of 30 patients undergoing 32 CEAs.
- Continuous TCD monitoring of the middle cerebral artery (MCA) for flow velocities and embolic counts.
- Analysis of TCD and electroencephalographic (EEG) changes; Dextran-40 used for high embolic loads (>50 counts/hour).
Main Results:
- A 46% average drop in MCA velocity during clamping, with 18.8% experiencing ischemia (3.1% with TCD and EEG changes).
- Postarteriotomy hyperemia observed in 18.8% of cases.
- 88% of cases showed postoperative emboli, with 31% having high embolic loads (>50/hour).
Conclusions:
- TCD is a valuable adjunct to EEG for assessing cross-clamping ischemia in real-time.
- TCD detects postoperative hyperemic responses.
- TCD quantifies microembolic loads, guiding Dextran-40 treatment for localized cerebral ischemia.