ORBi: Gustin Pascal - Measurement of Total Respiratory Impedance in Calves by the Forced Oscillation Technique

Reference : Measurement of Total Respiratory Impedance in Calves by the Forced Oscillation Technique


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Veterinary medicine & animal health
	To cite this reference:	http://hdl.handle.net/2268/6771

Title :	Measurement of Total Respiratory Impedance in Calves by the Forced Oscillation Technique
Language :	English
Author, co-author :	Gustin, Pascal [Université de Liège - ULg > Centre de Physiopathologie des Bovins Bruxelles > > >]
	Dhem, A. R. [> > > >]
	Lomba, Fernand [> > > >]
	Lekeux, Pierre [Université de Liège - ULg > Centre de Physiopathologie des Bovins Bruxelles > > >]
	Van de Woestijne, K. P. [> > > >]
	Landser, F. J. [> > > >]
Publication date :	May-1988
Journal title :	Journal of Applied Physiology (Bethesda, Md. : 1985)
Publisher :	American Physiological Society
Volume :	64
Issue/season :	5
Pages :	1786-91
Peer reviewed :	Yes (verified by ORBi)
ISSN :	8750-7587
e-ISSN :	1522-1601
City :	Bethesda
Country :	MD
Abstract :	[en] We have determined the resistance (Rrs) and the reactance (Xrs) of the total respiratory system in unsedated spontaneously breathing calves at various frequencies. A pseudorandom noise pressure wave was produced at the nostrils of the animals by means of a loudspeaker adapted to the nose by a tightly fitting mask. A Fourier analysis of the pressure in the nostrils and flow signals yielded mean Rrs and Xrs, over 16 s, at frequencies of 2-26 Hz. A good correlation was found between values of pulmonary resistances measured by the isovolume method at the respiratory frequency of animals and values obtained at a frequency of 6 Hz by use of our technique. The linearity of the respiratory system, the reproducibility of the technique, and the effects of upper airways on results have been studied. In healthy calves, Rrs increases with frequency. Mean resonant frequency is 7.5 Hz. Bronchospasm was induced in six calves by administration of intravenous organophosphates. Rrs tended to decrease with increasing frequency. Resonant frequency exceeded 26 Hz. All parameters returned to initial values after administration of atropine. In healthy calves, atropine produces a decrease in Rrs, especially at low frequencies. Values of resonant frequency are not modified.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/6771

There is no file associated with this reference.

All documents in ORBi are protected by a user license.

Dspace v1.5