A 10-year-old 4.5-kg (9.9-lb) castrated male Siamese cat was referred to the Oradell Animal Hospital because of suspected pericardial and pleural effusions. The cat had been examined immediately prior to the hospital visit by the referring veterinarian because of a decline in appetite of 1 week's duration and a decline in activity level during the preceding 24 hours. The effusions were detected via thoracic radiography. The cat was kept indoors and fed a diet of ground beef and a dry formulation of commercial cat food.
At the hospital, the cat was recumbent and had signs of depression; its body condition