An approximately 6-mo-old female bald eagle (Haliaeetus leucocephalus) was presented for an inability to fly and bilateral drooped wings. Pectoral muscle atrophy with a moderate polycythemia was present. Over the course of 3 wk, there were no improvements in flight capacity, although the bird gained substantial weight. Further investigation revealed a prominent cyanosis that was responsive to oxygen therapy, a chronic respiratory acidosis with hypoxia, a cardiac murmur, and a persistent polycythemia. No obvious antemortem etiology for the clinical findings was discovered on computerized tomography, angiography, or echocardiography. The bird was euthanatized as a result of the poor prognosis. Necropsy and histopathology revealed no significant cardiovascular or pulmonary pathology. No myopathy was evident on electron microscopy of formalin-fixed tissues. Based on these diagnostics, a neuromuscular disorder is suspected as the cause for the blood gas abnormalities, with a resulting polycythemia from the hypoxia.
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1 December 2014
ABSOLUTE POLYCYTHEMIA IN A BALD EAGLE (HALIAEETUS LEUCOCEPHALUS)
Andreia F. Fernandes,
Heather Fenton,
Shannon Martinson,
Marion Desmarchelier,
Shannon T. Ferrell
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Avian
Bald Eagle
Haliaeetus leucocephalus
hematology
hypoxemia
polycythemia