Canis ISSN: 2398-2942

Lung: lobe collapse

Synonym(s): Atelectasis

Contributor(s): Lynelle Johnson

Introduction

  • Cause: chronic bronchitis, bronchopneumonia, other lung parenchymal diseases, pleural effusions or pneumothorax, prolonged lateral recumbency (hypostatic congestion).
  • Signs: respiratory distress.
  • Diagnosis: radiography
  • Treatment: manage underlying cause, lobectomy if irreversible collapse.
  • Prognosis: can be good with early treatment - depends on underlying cause.

Pathogenesis

Etiology


Acquired condition, secondary to

Pathophysiology

  • Chronic bronchitis, bronchopneumonia and other lung parenchymal diseases → mucus plugging can lead to lung collapse (may be irreversible).
  • Pleural effusions or pneumothorax → lung collapse.
  • Prolonged lateral recumbency, eg while anesthetized → hypostatic congestion → lung collapse.
  • Respiratory/thoracic pathology, eg thoracic surgery, trauma, effusions may cause torsion.
  • Upset of normal equilibrium between intrapulmonary pressure and pleural pressures.
  • Airway obstruction → reduced collateral ventilation between lung tissue, eg neoplasia, foreign body, pneumonia, hypostatic.
  • Compression of lung - due to pleural fluids or congestion.
  • Loss of negative pleural pressure → collapse, ie pneumothorax.
  • Surfactant depletion, eg pneumonia, thromboembolism, trauma.

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.
  • Neath P J, Brockman D J, King L G (2000) Lung lobe torsion in dogs: 22 cases (1981-1999). JAVMA 217 (7), 1041-1044 PubMed.
  • Lord P F, Gomez J A (1985) Lung lobe collapse - pathophysiology and radiologic significance. Vet Radiol 26 (6), 187-196 VetMedResource.


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