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Updated on September 23rd, 2025
Pet's info: Cat | Mixed Breed | Female | spayed | 15 years old | 5.5 lbs
My 15 year old DLH spayed cat has hyperthyroidism and is on methimazole. She developed pleural effusion and tachypnea 2 days ago. She went to vet, had supportive treatments, her T4 was twice normal. She's now on 15 mg methimazole per day, lasix, and amoxicillin. Follow up ekg Tues. Cat still tachypnea but lungs clear. The vet doesn't know what caused the effusion. Any ideas?
2 Answers
Answered By Megan, DVM, CVA
Veterinarian
Published on June 9th, 2017
Answered By Lindsey Edwards MVB, BSc, IVCA
Veterinarian
Poor Yoda, unfortunately in older cats the prognosis for cats with recurrent pleural effusion is quite poor. A sample of the fluid can be tested and examined under the microscope for indications as to the underlying nature but cancer is a common cause and should be ruled out in cases which return so quickly
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