title: Suspected drug-induced infiltrative lung disease culminating in acute respiratory failure in a dog treated with cytarabine and prednisone.
abstract: OBJECTIVE
  To describe a case of suspected drug-induced infiltrative lung disease (ILD) and acute respiratory failure associated with the administration of cytarabine and prednisone in a dog requiring mechanical ventilation.
  
  
  METHODS
  A 4.5-year-old, female spayed Yorkshire Terrier presented to the ICU with acute onset of respiratory distress following a 24-hour cytarabine infusion. The patient was previously diagnosed with meningoencephalitis of unknown etiology (MUO), caudal occipital malformation, and syringohydromyelia, and was being treated with oral prednisone and levetiracetam, and cytarabine infusions. The patient developed tachypnea and dyspnea, and had diffuse crackles on auscultation of all lung fields, and hypoxemia 6 hours following completion of the fourth cytarabine infusion (300 mg/m2). Thoracic radiographs revealed diffuse, bilateral infiltrates consistent with noncardiogenic pulmonary edema or acute respiratory distress syndrome. Respiratory distress and hypoxemia persisted despite oxygen supplementation and furosemide therapy and led to initiation of mechanical ventilation. Approximately 12 hours later, the dog became progressively hypoxemic with worsening pulmonary edema. The owners elected euthanasia. Postmortem examination revealed pulmonary edema and diffuse interstitial pneumonia. Histopathologic evaluation revealed pulmonary edema, severe acute neutrophilic and histiocytic pneumonia, and multifocal interstitial fibrosis. Bacterial culture yielded no growth.
  
  
  CONCLUSIONS
  Drug-induced ILD is rarely reported in the veterinary literature, and has not previously been reported in dogs receiving cytarabine. As with administration of any medication, adverse events may occur. While ILD is unlikely to be commonly recognized, it may be considered in veterinary patients receiving chemotherapy that acutely become dyspneic.
authors.affiliation: Department of Emergency and Critical Care, Friendship Hospital for Animals, Washington, DC, 20016. skhart@friendshiphospital.com.
authors.forename: Samantha K
authors.initials: SK
authors.lastname: Hart
authors.affiliation: Department of Emergency and Critical Care, Matthew J. Ryan Veterinary Hospital of the University of Pennsylvania, Philadelphia, PA, 19104.
authors.forename: Lori
authors.initials: L
authors.lastname: Waddell
mesh_terms: D000818:Animals; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage* / Q000009:adverse effects; D003561:Cytarabine / Q000008:administration & dosage* / Q000009:adverse effects; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000097:blood / Q000175:diagnosis* / Q000188:drug therapy; D004285:Dogs; D017809:Fatal Outcome; D005260:Female; D007166:Immunosuppressive Agents / Q000008:administration & dosage* / Q000009:adverse effects; D008590:Meningoencephalitis / Q000188:drug therapy / Q000662:veterinary; D011241:Prednisone / Q000008:administration & dosage* / Q000009:adverse effects; D012128:Respiratory Distress Syndrome / Q000139:chemically induced / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000662:veterinary*
chemical_list: D000893:Anti-Inflammatory Agents; D007166:Immunosuppressive Agents; D003561:Cytarabine; D011241:Prednisone
keywords: chemotherapy; hypoxemia; interstitial pneumonia; mechanical ventilationpulmonary edema