HYPERTHYROIDISM IN CATS

Hyperthyroidism is a disease that effects older cats, and is caused by the excessive production of thyroid hormones -  usually as a result of tumor formation in the thyroid gland.

SYMPTOMS:

¨        weight loss despite a ravenous appetite

¨        increased thirst and urination

¨        restlessness

¨        frequent crying or vocalizing

¨        rapid heart beat

The effects of  untreated hyperthyroidism on the heart may be severe and can cause congestive heart failure.

DIAGNOSIS:

Often the thyroid gland will be enlarged and the doctor will suspect disease after feeling your cat’s neck.

Diagnosis is confirmed by the blood test detecting abnormally high levels of thyroid hormone in the circulating blood

(T4 levels).

TREATMENT OPTIONS:

1.      Radioactive Iodine Treatment: Available in Vancouver by referral at North West Nuclear Medicine for Animals Inc. Radioactive iodine is injected subcutaneously (under the skin) and over a period of time destroys cancerous cells which are producing an excess of hormone. During this time cats have to remain hospitalized. Usually patients are able to go home after 7 days.

2.      Tapazole medication: tablets or gel (applied to the inner skin of the ear). Usually has to be given twice a day.

3.      The affected thyroid gland can be surgically removed.

MANAGEMENT:

Many cats are well managed with medications for years. A properly managed cat is happy, eats well and maintains a stable body weight. At Mission Veterinary Hospital, we manage these cats through regular, complimentary nurse exams every 1 to 3 months. Your cat will need to see the veterinarian twice a year and thyroid levels and blood urine tests are done annually.