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Zinc toxicosis in an Umbrella Cockatoo (Cacatua alba)

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Abstract

A three-year old male Umbrella Cockatoo (Cacatua alba) presented to the referring veterinarian (rDVM) for a two-month history of diarrhea and decreased appetite. On presentation, the bird was bright and alert and had loose stool. Budding yeast were found on fecal smear Gram stain, and a course of oral nystatin was prescribed. Due to lack of response to nystatin treatment, a course of fluconazole was initiated. The bird presented again to the rDVM six weeks later for lethargy, anorexia, and continued diarrhea. Radiographic images showed metal-opacity foreign bodies in the ventriculus, suspected to be a part of a keychain. Samples of blood and plasma were submitted for lead and zinc analysis, respectively. The blood lead concentration was below the detection limit, while plasma zinc concentration was greatly elevated at >26 ppm. Therapy included calcium EDTA, cathartics, sucralfate, enrofloxacin, and assist feedings. After one week, radiographs were repeated, and images showed that the metal foreign bodies were still present in the ventriculus. The patient was then referred to the Cornell University Hospital for Animals' Exotic Animal Service. Endoscopic removal of the foreign bodies was attempted under general anesthesia, but it was apparent that the keychain had broken into many small pieces, and removal would have required many passes of the endoscope, increasing the likelihood of tissue damage. Surgical removal was recommended, and the foreign body material was removed via proventriculotomy one week later. The patient recovered uneventfully from anesthesia and was discharged to the care of his owner with tramadol, calcium EDTA, enfloxacin and sucralfate. Follow-up care was provided by the rDVM. The patient's plasma zinc concentration declined to reference values and the patient recovered well from surgery.

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Senior seminar paper
Seminar SF610.1 2012

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2012-03-07

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Cockatoos -- Effect of heavy metals on -- Case studies

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term paper

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