AN ACOUSTIC MODEL OF THE PATIENT UNDERGOING ARTIFICIAL VENTILATION

In conventional intermittent positive pressure ventilation, respiratory gas exchange can be considered in terms of the bulk movement of gas into and out of the lungs. However, in high frequency ventilation (HFV) it is difficult to apply this concept, as the tidal volumes may be significantly less than the anatomical deadspace of the lungs. In order to clarify the mechanism by which gas exchange occurs in HFV, studies have been made of the distribution of inspired gas flo