title: Simulation of exchanges of multiple gases in bubbles in the body.
abstract: This communication introduces a system of equations, for numerical solution, which simulates the generation, growth, and decay of bubbles. The system is an advance over previous works because it allows for simultaneous diffusion of any number of gases. Our purpose for developing the system is to gain insight into the bubbles that occur in the body in decompression sickness (DCS). We validate the calculation system by matching observed data of DCS bubbles and of large subcutaneous gas pockets in rats. We demonstrate how a temporary supersaturation and bubble formation can occur without change of ambient pressure when there is a change in the inert gas being breathed. With exposures to hypobaric environments, such as when astronauts work in space, simulations show that O2, CO2, and water vapor add appreciably to volume of bubbles and affect the diffusion of inert gas.
authors.affiliation: Department of Physiology, University at Buffalo, SUNY 14214.
authors.forename: M E
authors.initials: ME
authors.lastname: Burkard
authors.forename: H D
authors.initials: HD
authors.lastname: Van Liew
mesh_terms: D001274:Atmospheric Pressure; D002245:Carbon Dioxide; D003198:Computer Simulation; D003665:Decompression Sickness; D006931:Hyperbaric Oxygenation; D008433:Mathematics; D008954:Models, Biological; D010100:Oxygen; D011659:Pulmonary Gas Exchange / Q000502:physiology*; D014867:Water
chemical_list: D014867:Water; D002245:Carbon Dioxide; D010100:Oxygen