Background Microbubbles (MB) and ultrasound have been shown to enhance thrombolysis. We sought to evaluate safety and efficacy on middle cerebral artery (MCA) recanalization of local MB administration during intra-arterial (IA) thrombolysis and continuous transcranial Doppler (TCD) monitoring. Methods Patients with acute M1-MCA occlusion were treated with intravenous tissue plasminogen activator (iv-tPA) and continuously monitored with TCD. If recanalization was not achieved during first-hour bridging IA-rescue was adopted: MB + tPA direct intraclot microcatheter infusion. TCD flow monitoring allowed continuous insonation at clot location. Recanalization was angiographically assessed (thrombolysis in cerebral infarction [TICI] score) and compared with simultaneous TCD data. IA procedures were stopped at 6 hours. Recanalization was reassessed at 12 hours (TCD). Neurological status was repeatedly assessed (National Institutes of Health Stroke Scale [NIHSS]). At three months, patients were considered independent if mRS ≤ 2. Resluts Of the 18 included patients (mean age 72), 16 received standard iv-tPA (.9 mg/kg). Nine patients were recanalized during tPA infusion and 9 patients underwent IA-rescue procedures. Median pre-IA NIHSS score: 20. Median time to IA initiation was 175 ± 63 minutes. Mean IA doses were tPA = 10 ± 3 mg and MB = 3 ± 1 mL. TCD monitoring allowed direct visualization of massive MB arrival during every administration. In-procedure recanalization was observed in 78% (n = 7): complete-TICI3 in 22% (n = 2), partial-TICI2 in 56% (n = 5). Perfect correlation was observed between TICI and TCD scores. At 12 hours complete recanalization increased to 56%, partial to 22%. One patient (11%) experienced symptomatic intracranial hemorrhage accounting for the only death. Median NIHSS evolution was 12 at 24 hours and 10 at discharge. At 3 months 4 patients (44%) were independent. Conclusion The combination of ultrasound and IA MB and tPA may be a strategy to enhance the thrombolytic effect and increase recanalization rates. © 2009 by the American Society of Neuroimaging.
- intra arterial
Ribo, M., Molina, C. A., Alvarez, B., Rubiera, M., Alvarez-Sabin, J., & Matas, M. (2010). Intra-arterial administration of microbubbles and continuous 2-MHz ultrasound insonation to enhance intra-arterial thrombolysis. Journal of Neuroimaging, 20(3), 224-227. https://doi.org/10.1111/j.1552-6569.2008.00357.x