High-frequency jet ventilation (HFJV) is a form of mechanical respiration gaining greater popularity in the treatment of newborn infants with respiratory disesase. Using low tidal volumes and high frequencies, HFJV has been demonstrated to provide adequate ventilation; however, the exact mechanisms producing this gas exchange have not been clearly defined. Flow visualization experiments using geometrically and dynamically similar straight and branched tube models have been performed to investigate the importance of gas convection to this exchange. Convective currents have been observed which indicate a bidirectional fluid motion involving a forward core motion of fluid and a reverse annular flow near the tube walls. Increasing the end compliance in the models has shown an enhanced fluid motion. These convective mechanisms are important in explaining the gas-exchange mechanisms of HFJV.
|Original language||English (US)|
|Number of pages||3|
|State||Published - 1987|
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