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Blood vessel rupture by cavitation.
Hong Chen1, Andrew A Brayman, Michael R Bailey
1Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, 1013 NE 40th Street, Seattle, Washington 98105, USA.
Urological Research
|August 4, 2010
Summary
Cavitation bubble dynamics during shock wave lithotripsy can cause blood vessel rupture through vessel distention, invagination, and liquid jets. This study directly observed these mechanisms in rat mesenteries, revealing how bubbles damage vessels.
Area of Science:
- Biomedical Engineering
- Medical Physics
- Vascular Biology
Background:
- Shock wave lithotripsy (SWL) is a common treatment for kidney stones.
- Cavitation, the formation and collapse of bubbles, is a suspected cause of vascular injury during SWL.
- The precise mechanisms by which cavitation induces vessel rupture remain unclear.
Purpose of the Study:
- To directly visualize and understand the dynamics of cavitation bubbles within blood vessels.
- To correlate observed bubble dynamics with the mechanisms of vascular rupture.
- To elucidate the role of bubble expansion, collapse, and associated phenomena in vessel injury during SWL.
Main Methods:
- Utilized a high-speed photomicrography system for direct observation.
- Studied ex vivo rat mesentery tissue to mimic in vivo conditions.
- Examined bubble extravasation and dye leakage to assess vascular integrity.
- Analyzed bubble expansion, collapse, and liquid jet formation.
Main Results:
- Observed cavitation bubble expansion leading to significant vessel distention.
- Documented bubble collapse causing localized vessel invagination.
- Identified the formation of high-velocity liquid jets during bubble collapse.
- Correlated these dynamic events with observable signs of vascular rupture.
Conclusions:
- Cavitation bubble dynamics play a critical role in vessel rupture during SWL.
- Vessel distention, invagination, and liquid jet formation are key mechanisms contributing to SWL-induced vascular injury.
- Direct visualization provides crucial insights into the biomechanics of SWL complications.
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