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What is the relevance of nasopharyngeal collapse in canine radiography.

VRU 63(5)

June 13, 2023

Study: The study is a prospective, observational, and pilot study that investigates changes in the nasopharyngeal lumen in clinically normal Beagle dogs. The hypothesis of this study was that change in nasopharyngeal lumen would be over 50% in Beagle dogs without cardiopulmonary diseases.

Methods: The study included 42 Beagle dogs without cardiopulmonary diseases. Cervical radiographies were acquired during inspiration and expiration, and nasopharyngeal luminal change (%) was calculated. The median nasopharyngeal luminal change was 16.6%, and nasopharyngeal luminal change over 50% was identified in two dogs.

Results: The results showed that the nasopharyngeal luminal change was significantly associated with body condition score and body weight. There was no correlation between nasopharyngeal luminal change and age.

Conclusion: The study concludes that change in nasopharyngeal lumen over 50% can be identified in Beagle dogs without cardiopulmonary diseases and may be over-diagnosed as partial pharyngeal collapse. Further studies for comparing change in nasopharyngeal lumen between clinically normal dogs and dogs with respiratory signs are warranted.

Inspiratory and expiratory radiographs of dogs with nasopharyngeal luminal change < 25% (A), 25−50% (B), and >50% (C). A, The dog showed 3.4% nasopharyngeal narrowing. B, The dog showed 37.2% nasopharyngeal narrowing. C, The dog showed 65.4% nasopharyngeal narrowing. Abbreviations: Insp, inspiration; exp, expiration

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