ISSN:
1741-0444
Keywords:
Delivered oscillatory volume
;
High frequency oscillation
;
Lung models
;
Mean pressure
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
Notes:
Abstract In an in vitro study, the influence of different basic characteristics of high-frequency oscillation (HFO) circuits upon pressure and flow patterns was investigated for a wide variety of lung surrogates. A distinct resonant amplification was observed: the delivered oscillatory volume was found to exceed the piston displacement up to a factor of 1.6. In the whole frequency range of 0–70 Hz the delivered oscillatory volume and its resonance characteristics were entirely determined by the HFO circuit and independent of the properties of the lung surrogates investigated. Accordingly, it appears to be possible to determine the delivered oscillatory volume in vitro and to calibrate the HFO circuit also for use under physiological conditions. in the formation of mean pressure, contributions were found which emerged outside the lung surrogate. They were highly dependent on the HFO circuit arrangement and were superimposed to the local mean pressure components in the lung.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02442291
Permalink
