ISSN 2398-2977      

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

pequis

Synonym(s): SPARAO, Acute allergic airway disease


Introduction

  • 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.
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Pathogenesis

Etiology

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

Pathophysiology

  • Pulmonary hypersensitivity to inhaled allergens   →   bronchoconstriction.
  • See also Equine asthma.

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 J 33 (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 Educ 11 (3), 116-120 VetMedResource.
  • McGorum B C & Dixon P M (1999) Summer pasture associated obstructive pulmonary disease (SPAOPD) - an update. Equine Vet Educ 11 (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 Educ 11 (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 Rec 131 (8), 163-167 PubMed.

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