The effect of cuff presence and cuff inflation on airway pressure in a canine tracheostomy tube model

Authors

  • Jamie R. Wignall BSc, BVetMed, MS,

    Corresponding author
    1. Department of Clinical Science and Services, The Royal Veterinary College, University of London, North Mymms, United Kingdom
    Current affiliation:
    1. California Veterinary Specialists, 39809 Avenida Acacias, Murrieta, CA
    • Address correspondence and reprint requests to J. R. Wignall, California Veterinary Specialists, 39809 Avenida Acacias, Murrieta, CA 92563. Email: jwignall@lsu.edu

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  • Stephen J. Baines MA, VetMB, PhD, DECVS

    1. Department of Clinical Science and Services, The Royal Veterinary College, University of London, North Mymms, United Kingdom
    Current affiliation:
    1. Willows Referral Service, Solihull, West Midlands, United Kingdom
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  • Presented in abstract form at The British Small Animal Veterinary Association Congress, April 2010, Birmingham, UK, and in poster format at the European College of Veterinary Surgeons Congress, July 2010, Helsinki, Finland.

Abstract

Objective

To evaluate the effect of cuff presence and cuff inflation on airway pressure in an inspiratory model of canine tracheostomy.

Design

Ex vivo experimental study. Cadaver tracheas from Beagle dogs were attached aborally to a vacuum. Airway pressure and flow rate was measured before and after placement of tracheostomy tubes.

Animals

None.

Interventions

Adult uncuffed tubes and cuffed tracheostomy tubes (sizes 4, 6, 8, and 10) were placed within tracheas. Cuffs were investigated without inflation and at maximum cuff inflation. Airway pressure was measured at constant airflow rates at 30 and 60 L/min.

Measurements and Main Results

At set flow rates, airway pressures of tracheostomy tubes were compared to the intact trachea. A size 4 uncuffed tracheostomy tube showed the lowest airway pressure and a size 4 cuffed trachestomy tube with inflation showed the highest airway pressures. For sizes 6, 8, and 10 tubes, the presence of a cuff with and without inflation significantly increased airway pressure. Inflation of a cuff always significantly increased airway pressure. Similar pressure is seen between sizes 4 and 6 uncuffed tubes.

Conclusions

Cuffed tracheostomy tubes should not be used unless specifically indicated due to increased airway pressure.

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