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Hyperthyroidism Info
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Hyperthyroidism Blog Topics
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Dr. Michael Dym
Holistic & Conventional Veterinarian
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"Over 19 years of caring for
the well-being of pets"
Visit his Ask the Vet blog.
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Hyperthyroidism Treatment for Cats
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Hyperthyroidism Treatment: Surgery
Surgery to remove the thyroid is an effective cure; however, this surgery is very delicate. The parathyroid glands, which regulate calcium, are located on the thyroid gland. If the parathyroid glands are accidentally removed, your pet will develop a life-threatening drop in calcium. The remedy is to provide calcium supplements daily.
Hyperthyroidism Treatment: Raditation
Radiation or radioiodine treatment targets the thyroid only, and spares the parathyroid glands. After treatment, your pet remains in the hospital for a week so that all the radioactive material is eliminated from your pet's body. No surgery is necessary, and it is relatively rare for the disease to reoccur.
Is Hyperthyroidism Treatment Linked to Kidney Failure?
As cats age, their kidneys often become less able to clear wastes from the body. When the hyperactive thyroid is pumping up the blood pressure, the amount of blood passing through the kidneys is higher than normal. With high blood pressure, even if the kidneys are not functioning well, wastes have ample opportunity to be cleared.
If a pet is treated for hyperthyroidism, his or her blood pressure returns to normal. Compared with the hyperthyroid state, the blood will no longer be moving through the kidneys as often, and gradually the amount of waste not cleared from the blood will increase. It is not that the kidney disease occurred after the thyroid problem was treated, but that the kidney disease was unmasked as the blood pressure returned to normal.
To predict whether your pet has the potential for kidney failure if his or her hyperthyroidism is treated, most veterinarians require that the pet receive oral Methimazole for several weeks before either surgery or radioiodine treatment. If your pet remains healthy and no kidney wastes collect in the blood as the thyroid levels normalize as the result of Methimazole, it is usually safe to consider permanent medication, surgery or radioiodine therapy. If your pet does show signs of kidney failure, many veterinarians recommend not treating the thyroid disease.
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