Bioeffects of positive and negative acoustic pressures in vivo

The Journal of the Acoustical Society of America
M R BaileyE L Carstensen

Abstract

In water, the inertial collapse of a bubble is more violent after expansion by a negative acoustic pressure pulse than when directly compressed by a positive pulse of equal amplitude and duration. In tissues, gas bodies may be limited in their ability to expand and, therefore, the relatively strong effectiveness of negative pressure excursions may be tempered. To determine the relative effectiveness of positive and negative pressure pulses in vivo, the mortality rate of Drosophila larvae was determined as a function of exposure to microsecond length, nearly unipolar, positive and negative pressure pulses. Air-filled tracheae in the larvae serve as biological models of small, constrained bubbles. Death from exposure to ultrasound has previously been correlated with the presence of air in the respiratory system. The degree of hemorrhage in murine lung was also compared using positive and negative pulses. The high sensitivity of lung to exposure to ultrasound also depends on its gas content. The mammalian lung is much more complex than the respiratory system of insect larvae and, at the present time, it is not clear that acoustic cavitation is the physical mechanism for hemorrhage. A spark from an electrohydraulic lithotripter was...Continue Reading

Citations

Sep 21, 2000·Ultrasound in Medicine & Biology·W T ShiB B Goldberg
Feb 17, 2001·Ultrasound in Medicine & Biology·E L CarstensenD Dalecki
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Apr 18, 2019·Neurotherapeutics : the Journal of the American Society for Experimental NeuroTherapeutics·Yuexiang WangZhuo Yang
May 20, 2021·Ultrasound in Medicine & Biology·Louise M SteeleDelores J Smith

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