Cardiogenic Oscillations of He and SF6 in Expired Gas in Dogs
Cardiogenic oscillations synchronous with the heart beat modulating the partial pressure profile of the alveolar plateau (phase III) are generally attributed to the action of the heart altering the distribution of expired flow from lung units with differing partial pressures (Arieli, 1983; Bradley et al., 1975; Fowler and Read, 1961; Langer et al., 1960; West and Hugh-Jones, 1961).The amplitude of cardiogenic oscillations of inert gases with differing diffusivity has been demonstrated to exhibit only minor differences (Arieli, 1983; Arieli et al., 1981; Bradley et al., 1975) but no quantitative analysis has been presented as yet.
KeywordsAxial Dispersion Alveolar Plateau Cardiogenic Oscillation Regional Pulmonary Blood Flow Steady Laminar Flow Condition
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