[Experiences with the use of oscillating high frequency ventilation].
Our investigations have demonstrated that the effect of oscillatory high-frequency ventilation (HFO) on gas exchange in dogs is directly proportional to the oscillatory flow amplitude VM. Because of the equation: VM = PM/Z, gas exchange is increasing with rising oscillatory amplitude of the ventilation pressure PM and decreasing with rising impedance Z of the respiratory system. This system consists of endotracheal tube and the lungs of the dog investigated. The impedance Z = square root of R2 + X2 (resistance R and reactance X) achieves a minimal value near at the resonant frequency (reactance X = 0, in healthy intubated dogs near at 5 Hz) and increases with rising oscillatory frequency. Thus the oscillatory high-frequency ventilation is most effective near to the resonant frequency of the respiratory system. The results presented allow the conclusion that the application of high-frequency ventilation can be optimized by monitoring the respiratory mechanics parameters.
Harzendorf
E
E
Klinik für Anästhesiologie und Intensivtherapie im Klinikum, Berlin-Buch, DDR.
Müller
E
E
Voigt
H
H
Bomm
M
M
Oddoy
A
A
Merker
G
G
Danzmann
E
E
D000818:Animals; D004285:Dogs; D006612:High-Frequency Ventilation; D007442:Intubation, Intratracheal; D008168:Lung / Q000502:physiology*; D011659:Pulmonary Gas Exchange
Erfahrungen bei der Anwendung der oszillatorischen Hochfrequenzbeatmung.