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Cat Forum / Health and Behavior / July 2005Hyperthyroidism became hypothyroidism
>From too much thyroid to too little. Treatment with radioactive iodine worked too well on my cat. My hope of having a well cat who doesn't need a pill has just evaporated. I was never presented this as a possitibility. But now faced with the reality, I want other to know it can and did happen. d. > >From too much thyroid to too little. > [quoted text clipped - 5 lines] > I was never presented this as a possitibility. But now faced with the > reality, I want other to know it can and did happen. Oh no. So now you have to give your cat thyroid every day? > >From too much thyroid to too little. > [quoted text clipped - 5 lines] > I was never presented this as a possitibility. But now faced with the > reality, I want other to know it can and did happen. This is not unusual. After radioiodine tx, many cats go through a period of subclinical hypothyroidism that's almost always asymptomatic and usually doesn't require any therapy in the vast majority of cats. During this short period, TSH (thyroid-stimulating hormone) secretion resumes again, the normal, atrophied thyroid tissue becomes functional again, and the cat then becomes euthyroid. In the very cases where permanent hypothyroidism does occur, its usually several months after I-131 tx. How long ago did your cat receive I-131 tx? Phil 3 months. What's my prognosis now? d. > 3 months. > > What's my prognosis now? You're in the delicate range- T4 could still go up. I would monitor her T4 levels every month for the next few months and if she's still hypothyroid after 6 months, monitor every other month for a few months. You don't need a full chemistry- just T4. Best of luck, Phil. > 3 months. > > What's my prognosis now? You're in the delicate range- T4 could still go up. I would monitor her T4 levels every month for the next few months and if she's still hypothyroid after 6 months, monitor every other month for a few months. You don't need a full chemistry- just T4. Best of luck, Phil. > >From too much thyroid to too little. > [quoted text clipped - 7 lines] > > d. This happened to my friend, not her cat, *her*. I think it's always a possibility. Sorry about your kitty; hopefully the meds will work well but it is a drag that you have to continue to pill her. Candace >>>From too much thyroid to too little. >> [quoted text clipped - 10 lines] > This happened to my friend, not her cat, *her*. I think it's always a > possibility. I think that thyroids are just that tricky. That is what I have discovered about them since I had to become a thyroid expert. ;) > Sorry about your kitty; hopefully the meds will work well > but it is a drag that you have to continue to pill her. Yes. Best of luck with kitty! Purrs! :) Pam There is a topical you can use instead of the pill which may or may not coause stomache problems ,you just rub it in it's ear . Ask your vet to find a pharm. that will mix it . >> >From too much thyroid to too little. >> [quoted text clipped - 13 lines] > > Candace Thanks for the tip. I am still waiting for a doctor from the iodine treatment center to call me. d. I am still waiting. My personal vet said I should call radio cat vetinary hospital, but the doctor in 24 hours hasn't returned my call. This is in northern Virginia. My initial impression was that this was a professional outfit. Now I am not so sure. When I called to voice concern, I got a defensive posture from the receptionist, who immediately wanted to spin the disappointing results into something positve. All I want is some useful advice as to what I do next. The numbers used to chart the level of thyroid in a cat are confusing, and if anyone can guide me here, I would appreciate it. But it seems for more than a thousand bucks, the doctor could talk to me when the results are less than terrific. d. > I am still waiting. My personal vet said I should call radio cat > vetinary hospital, but the doctor in 24 hours hasn't returned my call. > This is in northern > Virginia. My initial impression was that this was a professional > outfit. Now I am not so sure. When he finally returns your call, ask him what was the dose of I-131. When a cat develops permanent hypothyroidism (longer than 3-4 months after tx) its usually because the cat received a large (too large) dose. The rational behind large doses is to destroy all the hyperplastic (adenomatous) thyroid tissue in one shot. Large doses are necessary in cats with thyroid carcinomas- only about 2% of hyperthyroid cats have malignant thyroid carcinomas. The large doses certainly cures hyperthyroidism and destroys hyperplastic and cancerous thyroid tissue anywhere in the body- but they also greatly increase the risk of hypothyroidism. Since you paid for the I-131, you have a right to know how much was used. > When I called to voice concern, I got a defensive posture from the > receptionist, who immediately wanted to spin the disappointing results [quoted text clipped - 3 lines] > The numbers used to chart the level of thyroid in a cat are confusing, > and if anyone can guide me here, I would appreciate it. "Normal" T4 can be confusing! The reference range for T4 in our lab is 0.8 - 2.0 mcg/dl- but we've had normal cats with serum T4 over 2.0- but always less than 5.0 mcg/dl. What is your lab's reference range and what is your cat's level? Phil > I am still waiting. My personal vet said I should call radio cat > vetinary hospital, but the doctor in 24 hours hasn't returned my call. > This is in northern > Virginia. My initial impression was that this was a professional > outfit. Now I am not so sure. When he finally returns your call, ask him what was the dose of I-131. When a cat develops permanent hypothyroidism (longer than 3-4 months after tx) its usually because the cat received a large (too large) dose. The rational behind large doses is to destroy all the hyperplastic (adenomatous) thyroid tissue in one shot. Large doses are necessary in cats with thyroid carcinomas- only about 2% of hyperthyroid cats have malignant thyroid carcinomas. The large doses certainly cures hyperthyroidism and destroys hyperplastic and cancerous thyroid tissue anywhere in the body- but they also greatly increase the risk of hypothyroidism. Since you paid for the I-131, you have a right to know how much was used. > When I called to voice concern, I got a defensive posture from the > receptionist, who immediately wanted to spin the disappointing results [quoted text clipped - 3 lines] > The numbers used to chart the level of thyroid in a cat are confusing, > and if anyone can guide me here, I would appreciate it. "Normal" T4 can be confusing! The reference range for T4 in our lab is 0.8 - 2.0 mcg/dl- but we've had normal cats with serum T4 over 2.0- but always less than 5.0 mcg/dl. What is your lab's reference range and what is your cat's level? Phil > >From too much thyroid to too little. > [quoted text clipped - 7 lines] > > d. Thanks; interesting data point. One of my cats had thyroid surgery, since it was her only real option at the time. There was no radioactive iodine treatment avaialble within a reasonable distance from here then, & remaining on Tapazole was contraindicated for her, since she had chronic liver disease. She eventually went hypo-T post-surgery, & then took thyroxine - which did work & produced normal results on her thyroid bloodwork. Cathy |
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