Microbubble-Mediated Sonothrombolysis Improves Outcome After Thrombotic Microembolism-Induced Acute Ischemic Stroke

Area of Science:

• Biomedical Engineering
• Neurology
• Vascular Biology

Background:

• Microthrombi contribute to poor outcomes in acute ischemic stroke despite recanalization therapy.
• Platelet-rich and erythrocyte-rich microthrombi are key pathological features.
• Developing effective treatments for microthrombi is crucial for improving stroke recovery.

Purpose of the Study:

• To investigate the efficacy of microbubble-mediated sonothrombolysis in dissolving platelet- and erythrocyte-rich microthrombi.
• To assess the potential of this method to reduce brain injury in acute ischemic stroke models.
• To evaluate sonothrombolysis as an adjunct to existing recanalization therapies.

Main Methods:

• Microthrombi were induced in rat mesenteric microvessels using ferric chloride or thrombin.
• Acute ischemic stroke was modeled by intracarotid injection of microthrombi in rats.
• Treatment groups included control, ultrasound alone, ultrasound with microbubbles, r-tPA, and combined therapy.

Main Results:

• Microbubble-mediated sonothrombolysis significantly improved microvessel recanalization rates.
• Cerebral infarct volumes and neurological scores were reduced in the ultrasound and microbubble group compared to controls.
• Combined ultrasound, microbubbles, and r-tPA showed superior efficacy in reducing infarcts for erythrocyte-rich microthrombi.

Conclusions:

• Microbubble-mediated sonothrombolysis demonstrates significant therapeutic potential for microthrombi-induced acute ischemic stroke.
• This approach offers a promising adjunctive strategy to enhance recanalization therapy effectiveness.
• Further research may establish sonothrombolysis as a valuable tool in stroke treatment protocols.