Equis ISSN 2398-2977

Guttural pouch: tympany

Contributor(s): Safia Barakzai, Christopher Brown, Paddy Dixon

Introduction

  • Cause: very rare functional or anatomical defect of opening of one or both guttural pouches allowing them to fill with air, but not to empty. May be genetic component to disorder in Arabian foals.
  • Signs: usually seen in foals; swelling in parotid region, stertorous breathing, dyspnea, dysphagia.
  • Diagnosis: history, signs, radiography, endoscopy.
  • Treatment: surgical fenestration or resection.
  • Prognosis: usually good; guarded with complications.

Pathogenesis

Pathophysiology

  • Congenital malfunction of pharyngeal opening (ostia) of guttural pouch which acts as a one way valve, letting air into pouch, but not out.
  • May have distorted cartilaginous border.
  • Air accumulates in guttural pouch   →   trapped   →   large tympanitic swelling in parotid region.
  • Usually unilateral, but if the affected pouch becomes very swollen   →   compression of the other pouch   →   bilateral distension in parotid area.
  • Initially not painful, non-inflammatory   →   accumulation of mucus in ventral aspect of distended pouch and reduced mucociliary clearance   →   secondary bacterial infection   →   mucopurulent nasal discharge.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Hahn C (2008) Common peripheral nerve disorders in the horse. In Pract 30 (6), 322-329 VetMedResource.
  • Krebs W & Schmotzer W B (2007) Laser fenestrated salpingopharyngeal fistulas for treatment of bilateral guttural pouch tympany in a foal. Equine Vet Educ 19 (8), 419-423 VetMedResource.
  • Schambourg M A, Marcoux M & Celeste C (2006) Salpingoscopy for the treatment of recurrent guttural pouch tympany. Equine Vet Educ 18 (5), 231-237 VetMedResource.
  • Freeman D E (2006) Guttural pouch tympany - a rare and difficult disease. Equine Vet Educ 18 (5), 234-237 Wiley Online Library.
  • Blazyczek I et al (2004) Inheritance of guttural pouch tympany in the Arabian horse. J Hered 95 (3), 195-199 PubMed.
  • Blazyczek I et al (2004) Retrospective analysis of 50 cases of guttural pouch tympany in foalsVet Rec 154 (9), 261-264 PubMed.
  • Tate L P Jr, Blikslager A T & Little E D (1995) Transendoscopic laser treatment of guttural pouch tympanites in eight foals. Vet Surg 24 (5), 367-372 PubMed.

Other sources of information

  • Hawkins D L (1992) Diseases of the guttural pouches. In: Current Therapy in Equine Medicine. Ed: Robinson N E. W B Saunders, USA. pp 275-276. ISBN: 0721634753.


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