As our feline friends become older there are a number of problems that may arise with their health. Unfortunately, we cannot stop the ageing process but there are some conditions of the older cat we can treat.
In this article we will discuss one particular condition, hyperthyroidism.
WHAT CAUSES THIS?
This is a condition caused by an excessive amount of thyroid hormone in the body. This arises because the thyroid glands located in the neck start to overproduce the hormone, we do not understand why this happens.
In a small number of cases it is due to cancer of the gland but in most the gland seems to switch itself into overdrive. It is most common in cats over 12 years old but can also occur in younger cats.
WHAT SIGNS SHOULD YOU LOOK FOR?·
- Weight loss·
- Normal or increased appetite·
- Excessive drinking·
- Changes in behaviour·
- Vomiting and diarrhoea
Thyroid hormone regulates the body's metabolic rate (speed of energy use). The effects seen are wide ranging as the metabolic rate is pushed abnormally high.
Most often we see weight loss but still a good appetite and the cat may even be eating more than before. He will probably be drinking more and if he has a litter tray you will notice more wetting. Vomiting and diarrhoea are also common signs but these may come and go.
Cats with this condition often have changes in their behaviour. They can become more excitable and nervous. They are often noted to become more aggressive although some previously aloof cats suddenly become friendlier.
Many of these signs happen gradually over time and are thought of as just being part of 'normal ageing' by owners.
WHAT HAPPENS WHEN YOU GO TO THE VET?
When taken to a vet, a cat with this condition will be found to have a faster heartbeat than normal and perhaps other abnormal sounds on listening to the heart. This is because of the stress put on the heart due to the high metabolic rate.
If treated early the heart can return to normal, but over time this disease will cause permanent damage to the heart. The vet can also usually feel one or both of the thyroid glands enlarged in the neck. Sometimes the gland slips down the neck as it enlarges and falls into the chest.
Your vet may want to turn the cat upside down to see if the gland will pop out again but if the cat is very irritable he may not allow this! Kidneys are also affected by hyperthyroidism and can start to fail if this condition is not treated soon enough. To confirm this condition a blood test to check the level of thyroid hormone is required. It will be abnormally high in this disease.
HOW CAN THIS BE TREATED?
There are three treatment options for hyperthyroidism and you and your vet need to decide which is best for your cat. They are:
- tablets (lifelong)·
- surgery to remove the gland·
- radioactive iodine therapy
The tablets stop the thyroid gland from taking up the iodine it needs to produce thyroid hormone. It only works whilst your cat is taking the tablets which need to be given every day. Surgery to remove the gland may be undertaken.
Radioactive iodine therapy is also available at some specialist centres. The cat is admitted to hospital and then sedated before giving an injection of radioactive iodine. The iodine concentrates in high amounts in the thyroid glands and the radioactivity kills the thyroid cells.
Unfortunately the cat is then radioactive so has to be kept isolated in the hospital for four weeks, no visiting is allowed and handling of the patients is kept to a minimum. After four weeks there is negligible risk to humans and the cat can return home.
Each of these treatments has advantages and disadvantages. Each owner/cat combination needs to be treated individually and your vet must help decide which option is best. The good news is that if picked up early and treated promptly this condition can be successfully managed.
The most important thing to remember is that old cats need regular check ups. Even if the signs you see seem to be gradual and minor it is always worth taking your cat to the vet for an examination. |