Abstract

After giving an account of the principles of pressure measurement in flowing air and a review of the literature on tracheal catheters, the authors describe the construction, the introduction and the function of their own transtracheal catheter. This is a teflon catheter with several side-ports which is introduced into the cervical trachea by a guide technique. After introduction, the catheter is stiffened by the insertion of 2 steel wires. The catheter was studied in model experiments concerning: a) the ability to measure the static pressure in flowing air, and b) the dynamic accuracy of a recording system built up around the catheter. The results indicated that the intratracheal pressure sensed in exercising horses well reflected the static pressure, and that the dynamic accuracy of the recording system was good to about 60 Hz. The present technique of recording the intratracheal pressure was used on 122 occasions in 69 exercising horses with only one complication referable to the catheter occurring. The transtracheal route of catheterisation may be superior, as catheters introduced by this route do not appear to influence the function of the pharynx and larynx. In contrast, nasotracheal catheters that traverse the larynx, might interfere with the respiratory function.

Keywords

upper airway obstruction; frequency response

Published in

Acta Veterinaria Scandinavica
1995, Volume: 36, number: 4, pages: 461-473
Publisher: DANSKE DYRLAEGEFORENING

SLU Authors

• Holm Forsström, Karin

  • Department of Medicine and Surgery, Swedish University of Agricultural Sciences
    

• Roepstorff, Lars

  • Department of Medicine and Surgery, Swedish University of Agricultural Sciences
    

• Obel, Nils J.

  • Department of Medicine and Surgery, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Other Medical Sciences not elsewhere specified


Permanent link to this page (URI)

https://res.slu.se/id/publ/44018