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Dissolution of multicomponent microbubbles in the bloodstream: 1. Theory
A Kabalnov1, D Klein, T Pelura
1Alliance Pharmaceutical Corporation, San Diego, CA 92121, USA. ekabalnova@aol.com
Ultrasound in Medicine & Biology
|August 8, 1998
Summary
This study examines bloodstream bubble dissolution, identifying three stages. Specific gas properties are crucial for prolonging bubble lifetime in medical applications.
Area of Science:
- Biophysics
- Physiology
- Medical Physics
Background:
- Bloodstream bubbles pose clinical challenges.
- Understanding bubble dissolution dynamics is critical for medical interventions.
- Gas embolisms can have severe physiological consequences.
Purpose of the Study:
- To analyze the dissolution process of gas bubbles in the bloodstream.
- To identify factors influencing bubble lifetime.
- To determine properties of osmotic agents for prolonging bubble survival.
Main Methods:
- Theoretical examination of bubble dissolution stages.
- Analysis of gas diffusion and phase change dynamics.
- Modeling bubble radius change over time.
Main Results:
- Bubble dissolution occurs in three distinct stages: initial swelling, osmotic agent diffusion, and condensation.
- Bubble lifetime is significantly influenced by the osmotic agent's Ostwald coefficient and saturated vapor pressure.
- Pure air bubbles have a lifetime of less than 1 second.
Conclusions:
- Prolonging the lifetime of micron-sized bubbles requires an osmotic agent with a low Ostwald coefficient (< or = 10(-4)) and high saturated vapor pressure (> or = 0.3 atm).
- These properties are essential for potential medical applications involving bloodstream bubbles.