If your dog or cat is losing their bark or meow do not put off a visit to your vet. If methimazole is discontinued, thyroid hormone levels will return to high levels over a few weeks. This cat is showing weight loss and poor coat – typical signs of hyperthyroidism. surgical removal of affected thyroid glands. Frequency of administration is determined by your veterinarian and usually based on T4 blood levels. One might say T3 determines how hard or how fast each cell works to do its job. Thyroid hormones affect nearly all the organs in the body; therefore, thyroid disease often causes secondary problems i, There are many clinical signs associated with feline hyperthyroidism. About: Feline hyperthyroidism is a common disease caused by a benign hormone-secreting tumour of the thyroid gland.It is the most common endocrine disorder in cats and occurs most often in cats over ten years of age. Surgical removal of the thyroid gland(s) can usually be performed without complications. Both thyroid glands are abnormal in this cat and take up the radioactive compound. A specific prescription diet can be fed to hyperthyroid cats to control the disease. While T3 is the active hormone, it turns out that more meaningful information is gained by measuring T4. These elevated values could be related to the increased metabolism, malnutrition, infection, congestive heart failure or direct toxic effects of the elevated T4 hormone. Rarely they are associated with malignant thyroid neoplasia. Hyperthyroidism is the most common hormone imbalance in cats. Enlarged thyroid glands can be surgically removed. This is called “sick” euthyroid syndrome. This disease emerged in the 1980s but has become so common that a wealth of information is available. Low blood calcium is treated with calcium or vitamin D. Nerve damage causes abnormal size of the pupils of the eyes and droopy eyelids. Radioactive iodine will also accumulate in ectopic thyroid tissue. This disease emerged in the 1980s but has become so common that a wealth of information is available. increased amount of stool or diarrhea – from overeating and hypermotility (increased movement of the intestine). The cats do not have to be placed under anesthesia for the procedure. The elevated T4 causes skeletal bone resorption which causes changes in the minerals and possible uremic gastritis which can lead to ulcerated stomachs and intestines. If the diagnosis is not obvious by blood tests, a nuclear medicine scan of the thyroid glands can be performed at certain specialty veterinary practices. Heart disease, hypertension (high blood pressure), kidney disease, rapid weight loss, neurologic problems are common diseases seen in cats. The prognosis for this disease depends on type of treatment selected, progression of the disease when first diagnosed and any underlying diseases that may be present. A CBC may also be needed to monitor for adverse effects of the thyroid treatment. In fact, 95% of cats with hyperthyroid disease are 10 years old or older. Cats afflicted with hyperthyroidism usually develop a variety of signs that may be subtle at first but that become more severe as the disease progresses. Older cats with hyperthyroidism often also have kidney disease. Dysphonia is hoarseness of voice, which can be associated with a damaged trachea, often in the case of hyperthyroidism, due to a mass or tumor on the thyroid. Perhaps they have been left in the vets or in a boarding facility and are voicing their indignation, or maybe there is a new cat that has moved in next door and they are … The frequency of revisits will depend on your cat’s clinical response. An ECG may be needed every 6 months based on the severity of the heart disease, if present. Often there is a malabsorption and maldigestion syndrome associated with these changes in the gastrointestinal tract that can cause diarrhea. hyperthyroid cat. Hyperthyroid cats will have an increased uptake in the thyroid glands making them easier to measure size and function. Very little research has been done on hypothyroidism and how it affects the voice, how frequently myxedema/ Reinke’s edema occurs, or best treatment options. Hyperthyroidism occurs most commonly in older cats and is rare in dogs. Not all cats experience these signs at the time of diagnosis but they can be present as invisible diseases resulting in heart failure, kidney failure, liver disease, sudden blindness, or sudden death and all can be prevented with timely treatment for thyroid disease. Home Care of Animal with Splints of Casts. occasionally weakness – may be caused by generalized weakness in the muscles and muscle wasting. Hyperthyroid cats are also extra thirsty and are sometimes brought to the vet because they are drinking so much water. Cats with heart disease may be too sick and fragile to anesthetize for surgery in which case methimazole can be given until the heart improves and the cat is stronger. This extra thyroid tissue is called ectopic thyroid. a fast heart rate – is related to increased metabolism and changes to the heart muscle (hypertrophic cardiomyopathy – thickening of the heart walls) due to overwork and inefficiency of blood movement through the heart and lungs. Doctors will readily make references to T3 and T4. One or both of the glands can enlarge and overproduce thyroid hormone. Felimazole or Methimazole may produce side effects in cats including depression, vomiting and lack of appetite. Clean Houses are Possible, Even With Pets! Hyperthyroidism is caused by a benign growth in the thyroid gland that is over-producing T4. Radioactive iodine treatment is very effective and rarely causes hypothyroidism. Your veterinarian will try to minimize the stress of your cat’s physical exam. Cats that have had surgery may have recurrence of hyperthyroidism. The cat is given a small dose of a radioactive compound that travels by the blood to the thyroid glands. How Does My Veterinarian Make a Diagnosis? occasionally difficulty breathing – panting and respiratory distress can be due to respiratory muscle weakness and increased carbon dioxide production. hyperthyroid cats are high risk anaesthetic cases • if one gland is affected and removed, the other side may become affected at a later date, causing symptoms to recur – ... Each cat and owner is different, so it is important to discuss the different treatment options with your vet to decide what is Also called thyrotoxicosis, hyperthyroidism is caused by an increase in production of thyroid hormones (known as T3 and T4) from an enlarged thyroid gland in a cats neck. Your veterinarian will refer you to one close by. Neurologic changes due to thiamine deficiency, potassium deficiency, and other vitamin and mineral deficiencies. If your cat displays any of these symptoms, contact your veterinarian. In fact, hyperthyroid kitties are sometimes so high-strung, it can seem as if they’ve had a few too many cups of coffee! The heart may appear enlarged on x-ray or ultrasound and may show abnormal electrical activity on an ECG (electrocardiogram). How does hyperthyroidism affect my cat? Urinalysis and/or urine culture and sensitivity – may be done to rule out a kidney or bladder infection that may be artificially decreasing the thyroid level in a hyperthyroid cat. Some rare cases of hyperthyroid disease are caused by malignant tumors known as thyroid adenocarcinomas. This diet is lower in salt and iodine and limits the amount of thyroid hormone that is produced. Treatment with radioactive iodine is only performed at selected specialty veterinary practices. Talk to your veterinarian about monitoring kidney function in hyperthyroid cats. Damage to the voice box causes a change in voice. is a common disease in cats, and mostly afflicts cats middle-aged and older. It's a condition that makes stomach acid wash back up into the esophagus, a tube that leads into your throat. This information is not meant to be a substitute for veterinary care. This is a disease seen most commonly in the cat. Radioactive iodine treatment is very effective and rarely causes hypothyroidism. If both glands are enlarged, they can both be removed, and most cats will still produce enough thyroid hormone by a few thyroid cells scattered throughout the body to prevent hypothyroidism (abnormally low thyroid hormone levels). The diet is not recommended for cats without the disease; and it does not satisfy the AAFCO nutrient profiles for cat food (a food does not have to meet those standards if it passed a feeding test). Methimazole may be used to reduce thyroid hormone levels to normal before surgically removing the thyroid gland(s). Methimazole is given for 1 to 2 months before surgery so that thyroid hormone levels are normal at the time of surgery. Hill’s claims that this diet, fed exclusively, will normalize a hyperthyroid cat’s hormone levels within 3 weeks. If something like this happens, let us discuss what you should do to help treat your cat with lost voice. Giving a cat a tablet can be tricky, some cats tolerate it well and others find it stressful. It is applied to bare skin once or twice a day. a poor hair coat – this can be a patchy, matted haircoat with excessive shedding. If your cat does not have elevated T4 levels but your veterinarian still suspects your cat has hyperthyroidism, additional tests may be recommended. Some cats with kidney disease will show a worsening of kidney function after treatment for hyperthyroidism. 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