Volumetric quantification of in vitro sonothrombolysis with microbubbles using high-resolution optical coherence...

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Cardiovascular Research

Background:

• Ultrasound (US) and microbubble (MB) cavitation show promise for accelerated thrombolysis.
• The precise mechanisms of MB-mediated sonothrombolysis remain incompletely understood.
• Understanding these mechanisms is crucial for optimizing clot-dissolving therapies.

Purpose of the Study:

• To investigate the mechanisms of microbubble-mediated sonothrombolysis using advanced imaging.
• To evaluate the efficacy of ultrasound, microbubbles, and rt-PA in reducing thrombus volume.
• To visualize the structural effects of sonothrombolysis on thrombus.

Main Methods:

• Three-dimensional (3-D) volumetric optical coherence tomography (OCT) was employed for imaging.
• OCT imaging was performed before and after contrast ultrasound application to thrombus.
• The study compared thrombus volume changes under different treatment conditions (US + MB + rt-PA).

Main Results:

• The combination of ultrasound, microbubbles, and rt-PA demonstrated the most significant reduction in clot volume.
• Optical coherence tomography images revealed distinct thrombus surface erosion on the side exposed to ultrasound and microbubbles.
• This suggests a direct interaction between cavitation effects and thrombus structure.

Conclusions:

• Ultrasound-induced microbubble cavitation, particularly with rt-PA, is a highly effective method for sonothrombolysis.
• Optical coherence tomography is a valuable tool for elucidating sonothrombolysis mechanisms.
• Further research should explore the impact of ultrasound transducer orientation and microbubble cavitation on thrombus structure and lysis efficacy.