I have a 12 year old Maine Coon cat who started making deep rumbly sounds while purring about 6 weeks ago. I took him to the vet and they prescribed 2 weeks of Clavamox drops. He got worse and had begun wheezing and struggling for air. I brought him back and they did xrays, put him under anesthesia and looked at his larynx but couldn't see a mass or anything. They thought it might be his teeth so I had them cleaned and two teeth removed. He got worse. Then I took him to a different vet who had endoscopy equipment and they put him under anesthesia and looked at his esophogus, larynx, trachea and couldn't find anything. They prescribed a 10 day treatment of antibiotics (zithromyocin) for a bacterial infection in case that was it. After 10 more days he was even worse. I brought him back and they put him under again and examined his soft palette carefully and did more xrays and found nothing. They ran a fungal blood panel and sent it off to the lab and we are awaiting results. They sent blood off for a heartworm test too which came back negative. He has been on a high dose of prednisone for about a month now because without it he cannot breathe. I give him a 5mg tab in the a.m. and a 5mg tab at night.
Even though the fungal panel results are not back yet we are desperate and he is running out of time so the vet prescribed an anti-fungal medication called Fluconazole (about 180.00 for 15 days). I started him on it a few days ago. He is also now on Furosamide to alleviate any edema around his heart I think? It seemed to help yesterday but today he is doing terribly.
I know that the prednisone can make a mass shrink and hard to find if there is one but it's a catch 22 because I think he'll die without it. Of all 4 doctors from the 2 hospitals that have seen him, none have them have seen any evidence of a mass and all have looked.
Does anyone out there have any ideas of what else my cat could be dealing with? I'm open to any and all ideas at this point. Thanks.