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Reperfusion after stroke sonothrombolysis with microbubbles may predict intracranial bleeding.
1Stroke Unit, Department of Neurology, University of Genova, San Martino Hospital, Italy.
Neurology
|September 10, 2009
Summary
Microbubble-enhanced sonothrombolysis for acute stroke accelerates clot lysis but increases hemorrhagic transformation risk. While it improves clinical outcomes, careful monitoring is crucial due to potential bleeding complications.
Area of Science:
- Neurology
- Biomedical Engineering
- Radiology
Background:
- Ultrasound-activated microbubbles (MB) accelerate clot lysis in acute stroke.
- However, MB activation may increase blood-brain barrier disruption and bleeding risk.
Purpose of the Study:
- To investigate the risk of hemorrhagic transformation (HT) after MB-enhanced sonothrombolysis in acute stroke patients.
Main Methods:
- A case-control study compared 188 acute stroke patients receiving IV tissue plasminogen activator (tPA) plus MBs with 98 controls receiving tPA alone.
- Patients were monitored for 2 hours with transcranial Doppler (TCD) and received 3 doses of MBs.
- Hemorrhagic transformation on 24-hour CT scans was assessed by blinded reviewers.
Main Results:
- MB group showed higher recanalization rates (p < 0.05) and improved clinical outcomes at 24 hours (54.9% vs 31.1%, p = 0.004).
- MB administration was linked to increased hemorrhagic infarction (HI) risk (21% vs 12%, p = 0.026).
- Symptomatic intracranial hemorrhage rates were similar; bleeding extent correlated with reperfusion time.
Conclusions:
- Microbubble administration is associated with early recanalization and a high rate of HT.
- The risk of symptomatic intracranial hemorrhage did not appear to increase with MB use.
- Further research is needed to confirm these findings and establish definitive conclusions.
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