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A Transtracheal Catheter for Recording the Static Tracheal Pressure in the Exercising Horse
En transtracheal kaleter för registrering av det statiska trycket i luftstrupen på häst under arbete
Acta Veterinaria Scandinavica volume 36, pages 461–473 (1995)
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. kw|Keywords|k]upper airway obstruction k]frequency response
Sammanfattning
Författarna redogör för principerna vid tryckmätning i strömmande luft och gör en genomgång av litteraturen över tracheal k atetrar. Konstruktion, införande och funktion av deras egen transtracheal kateter beskrivs. Detta är en teflonkateter med ett flertal sidoöppningar. Den förs in i luftstrupen med hjälp av en guideteknik. Efter införandet förstyvas katetern med två metalltrådar. Katetern har studerats i modellförsök med avseende på:
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a.
förmåga att mäta det statiska trycket i strömmande luft, och
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b.
den dynamiska exaktheten i ett registreringssystem uppbyggt kring katetern.
Resultaten tyder på att det intratracheal a trycket registrerat hos arbetande hästar väl avspeglar det statiska trycket, och att den dynamiska exaktheten hos registreringssystemet var god upp till c:a 60 Hz. Den beskrivna tekniken for intratracheal tryckmätning användes vid 122 tillfällen på 69 hästar under arbete, med en komplikation som kan hänföras till katetern i endast ett fall. Den trans trachea la metoden för kateterisering synes överlägsen, eftersom en kateter införd med denna metod, i motsats till nasotracheala katetrar, ej tycks påverka funktionen i pharynx och larynx.
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Acknowledgments
The authors are very grateful to Ann–Marie Löfgren for performing most of the drawings and to Maud Lide for excellent secretarial work.
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Roethlisberger-Holm, K., Roepstorff, L. & Obel, N. A Transtracheal Catheter for Recording the Static Tracheal Pressure in the Exercising Horse. Acta Vet Scand 36, 461–473 (1995). https://doi.org/10.1186/BF03547661
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DOI: https://doi.org/10.1186/BF03547661