Equis ISSN 2398-2977

Lung: SAD (summer pasture-associated recurrent airway obstruction)

Synonym(s): SPARAO, Acute allergic airway disease

Contributor(s): Tim Brazil, Christopher Brown, Timothy Mair, Nicola Menzies-Gow, Colin Roberts

Introduction

  • Clinical syndrome almost identical to recurrent airway obstruction (RAO)   Lung: recurrent airway obstruction (RAO)  , but affects pastured horses with no access to hay and straw.
  • Cause: suspected hypersensitivity to inhaled pollens or outdoor molds.
  • Signs: sudden onset of severe dyspnea.
  • Diagnosis: history and clinical signs; marked neutrophilia seen in tracheal mucus and bronchoalveolar lavage samples.
  • Treatment: remove from source of allergens.
  • Prognosis: seasonal condition; horses are affected between spring and early autumn with remission during winter months. Many are affected in subsequent years.
Print off the Owner factsheets on Emergencies - when to call the vet, Recurrent airway obstruction and Respiratory problems in your horse to give to your clients.

Pathogenesis

Etiology

  • No specific etiology confirmed.
  • Hypersensitivity to inhaled pollens or outdoor moulds is suspected.

Specific

  • 9.5% of horses with RAO in one study also suffered from SPARAO.

Pathophysiology

Timecourse

  • Seasonal condition with horses affected between spring and early autumn.
  • Complete or marked remission during winter months.
  • Horses may be affected in subsequent years.

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.
  • Robinson N E (2001)International workshop on equine chronic airway disease.Equine Vet J33(1), 5-19 PubMed.
  • Hudson N P H (1999)Management of a case of summer pasture associated obstructive pulmonary disease by inhaled corticosteroids and environmental control.Equine Vet Educ11(3), 116-120 VetMedResource.
  • McGorum B C & Dixon P M (1999)Summer pasture associated obstructive pulmonary disease (SPAOPD) - an update.Equine Vet Educ11(3), 121-123 VetMedResource.
  • Duvivier D H, Votion D, Roberts C A, Art T & Lekeux P (1999)Inhalation therapy of equine respiratory disorders.Equine Vet Educ11(3), 124-131 VetMedResource.
  • McGorum B C & Dixon P M (1992)Preliminary observations on inhalation and intradermal challenges of horses with oil seed rape.Vet Rec131(8), 163-167 PubMed.


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