Gentz E J, Pearson E G, Lassen E D, Snyder S P, Sharpnack E
College of Veterinary Medicine, Oregon State University, Corvallis 97331.
J Am Vet Med Assoc. 1994 May 1;204(9):1490-2.
The PCV of a llama increased from 50.8 to 74.0% during a 19-month period. The llama remained clinically normal unless stressed, when it would become dyspneic and tachypneic. Thoracic auscultation revealed sounds consistent with pneumonia, but were probably attributable to pulmonary congestion resulting from polycythemia. A diagnosis of secondary absolute polycythemia was made on the basis of high serum erythropoietin concentrations and no evidence of hypoxia. Necropsy revealed congestion of the lungs and liver. Cause of the polycythemia was not determined. Polycythemia should be considered as a differential diagnosis in a llama with exercise intolerance and harsh bronchovesicular sounds.
一只美洲驼的红细胞压积在19个月的时间里从50.8%升至74.0%。这只美洲驼在临床上一直正常，除非受到应激，此时它会出现呼吸困难和呼吸急促。胸部听诊发现有与肺炎相符的声音，但可能是由红细胞增多症导致的肺充血引起的。根据高血清促红细胞生成素浓度且无缺氧证据，诊断为继发性绝对性红细胞增多症。尸检发现肺和肝脏充血。红细胞增多症的病因未明确。对于有运动不耐受和粗糙支气管肺泡呼吸音的美洲驼，应考虑将红细胞增多症作为鉴别诊断。
