Diabetes in cats


Diabetes mellitus is a chronic disease in cats whereby either insufficient insulin response or insulin resistance leads to persistently high blood glucose concentrations. Diabetes affects up to 1 in 230 cats, and may be becoming increasingly common. Diabetes mellitus is less common in cats than in dogs. Eighty to ninety-five percent of diabetic cats experience something similar to type 2 diabetes but are generally severely insulin dependent by the time symptoms are diagnosed. The condition is treatable, and if treated properly the cat can experience a normal life expectancy. In type 2 cats, prompt effective treatment may lead to [|diabetic remission], in which the cat no longer needs injected insulin. Untreated, the condition leads to increasingly weak legs in cats and eventually to malnutrition, ketoacidosis and/or dehydration, and death.

Symptoms

Cats will generally show a gradual onset of the disease over a few weeks or months, and it may escape notice for even longer.
The first outward symptoms are a sudden weight loss accompanied by excessive drinking and urination; for example, cats can appear to develop an obsession with water and lurk around faucets or water bowls. Appetite is suddenly either ravenous or absent. These symptoms arise from the body's inability to use glucose as an energy source.
A fasting glucose blood test will normally be suggestive of diabetes at this point. The same home blood test monitors used in humans are used on cats, usually by obtaining blood from the ear edges or paw pads. As the disease progresses, ketone bodies will be present in the urine, which can be detected with the same urine strips as in humans.
In the final stages, the cat starts wasting, with the body breaking down its own fat and muscle to survive. Lethargy/limpness and acetone-smelling breath are acute symptoms of ketoacidosis and/or dehydration and constitute a medical emergency.
Untreated, diabetes leads to coma and then death.

Diabetic emergencies

Too little insulin over time can cause tissue starvation, as glucose cannot reach the brain or body. In combination with dehydration, fasting, infection, or other body stresses, the condition may progress to diabetic ketoacidosis, a medical emergency with a high fatality rate that cannot be treated at home. Symptoms include lethargy, a fruit-like smell of the breath or urine, shortness of breath, and an increase in thirst. Emergency care includes fluid therapy, insulin, management of presenting symptoms and 24-hour hospitalization.

Complications

The back legs may become weak and the gait may become stilted or wobbly owing to diabetic neuropathy, which is caused by damage to the myelin sheath of the peripheral nerves due to glucose toxicity and cell starvation, which are in turn caused by chronic hyperglycemia. Most common in cats, the back legs become weaker until the cat displays a plantigrade stance, standing on its hocks instead of on its toes as normal. The cat may also have trouble walking and jumping and may need to sit down after a few steps. Neuropathy sometimes heals on its own within 6–10 weeks once blood sugar is regulated.

Causes

The signs of diabetes mellitus are caused by a persistently high blood glucose concentration, which may be caused by either insufficient insulin or by a lack of response to insulin. Most cats have a type of diabetes mellitus similar to human diabetes mellitus type 2, with β-cell dysfunction and insulin resistance. Factors which contribute to insulin resistance include obesity and endocrine diseases such as acromegaly. Acromegaly affects 20–30% of diabetic cats; it can be diagnosed by measuring the concentration of insulin-like growth factor-1 in the blood.

Management

Diabetes can be treated but is life-threatening if left alone. Early diagnosis and treatment by a qualified veterinarian can help in preventing nerve damage, and, in rare cases, lead to remission. Cats do best with long-lasting insulin and low carbohydrate diets. Because diabetes is a disease of carbohydrate metabolism, a move to a primarily protein and fat diet reduces the occurrence of hyperglycemia.

Diet

Diet is a critical component of treatment and is in many cases effective on its own. For example, a recent mini-study showed that many diabetic cats stopped needing insulin after changing to a low carbohydrate diet. The rationale is that a low-carbohydrate diet reduces the amount of insulin needed and keeps the variation in blood sugar low and easier to predict. Also, fats and proteins are metabolized slower than carbohydrates, reducing dangerous blood sugar peaks right after meals.
Recent recommended diets are trending towards a low-carbohydrate diet for cats rather than the formerly recommended high-fiber diet. Carbohydrate levels are highest in dry cat foods made out of grains, so cats are better off with a canned diet that is protein and fat focused. Both prescription canned foods made for diabetic cats and regular brand foods are effective. Owners should aim to supply no more than 10% of the daily energy requirement of cats with carbohydrates.

Medications

Oral medications like Glipizide that stimulate the pancreas, promoting insulin release, are less and less used in cats, and these drugs may be completely ineffective if the pancreas is not working. These drugs have also been shown in some studies to damage the pancreas further or to cause liver damage. Some owners are reluctant to switch from pills to insulin injections, but the fear is unjustified; the difference in cost and convenience is minor, and injections are more effective at treating the disease.

Insulin

The method usually employed is a dose of slow-acting insulin twice daily to keep the blood sugar within a recommended range for the entire day. With this method, it is important for the cat to avoid large meals or high-carbohydrate food. Meals may also be timed to coincide with peak insulin activity. Once-daily doses are not recommended, since insulin usually metabolizes faster in cats than in humans or dogs. For example, an insulin brand that lasts 24 hours in people may only be effective for about 12 in a cat.
Cats may be treated with animal insulin or with human synthetic insulin. The best choice of insulin brand and type varies from animal to animal and may require some trial and error. The human synthetic insulin, Humulin N /Novolin N/ NPH, is usually a poor choice for cats, since cats metabolize insulin about twice as fast. The Lente and Ultralente versions were popular for feline use until summer 2005, when they were discontinued.
Until the early 1990s, the most recommended type for pets was bovine/porcine-derived PZI, but that type was phased out over the 1990s and is now difficult to find in many countries. There are sources in the US and UK, and many vets are now starting to recommend them again for pets, but they have been discontinued by most manufacturers as of 2007-2008. A new synthetic PZI analogue called ProZinc is now available.
Caninsulin is a brand of porcine-based insulin approved for cats which is available with a veterinarian's prescription. According to the manufacturer's website, the insulin's action profile in cats was similar to that of NPH insulin, and it lowered blood sugar quickly, but for only about 6–8 hours. Vetsulin was recalled in the US in November 2009 due to inconsistent strength; it was available again as of 2013.
Two ultra-slow time-release synthetic human insulins became available in 2004 and 2005, generically known as insulin detemir and insulin glargine. Studies have had good results with insulin glargine in cats. Follow-up research shows that Levemir can be used with a similar protocol and that either insulin on this protocol can lead uncomplicated feline cases to remission, with the most success being in cats who start on these protocols as soon as possible after diagnosis.

Dosage and regulation

Cats may have their mealtimes strictly scheduled and planned to match with injection times, especially when on insulin with a pronounced peak action like Caninsulin/Vetsulin or Humulin N. If the cat free-feeds and normally eats little bits all day or night, it may be best to use a very slow-acting insulin to keep a constant level of blood glucose. Some veterinarians still use the outdated recommendation of using Humulin "N" or NPH insulin for cats, which is very fast-acting for most cats. The slower-acting Lente and Ultralente, so most cats are treated with either the veterinary PZI insulins or the new full-day analogs glargine and detemir.
The first goal is to regulate the cat's blood glucose by keeping the blood glucose values in a comfortable range for the cat during most of the day. This may take a few weeks to achieve.
The most successful documented method is tight regulation with Lantus or Levemir.
Typical obstacles to regulation include:
Absolute numbers vary between pets, and with meter calibrations. Glucometers made for humans are generally accurate using feline blood except when reading lower ranges of blood glucose. At this point the size difference in human and animal red blood cells can create inaccurate readings.

Somogyi rebound

Too much insulin may result in a contradictory increase of blood glucose. This "Somogyi effect" is often noted by cat owners who monitor their cat's blood glucose at home.Any time the blood glucose level drops too far to hypoglycemia, the body may defensively dump glucose, as well as hormones epinephrine and cortisol, into the bloodstream. The glycogen raises the blood glucose, while the other hormones may make the cat insulin-resistant for a time. If the body has no glycogen reserves, there will be no rebound effect and the cat will just be hypoglycemic.
Even a small overdose can trigger a rebound effect.
Rebound hyperglycemia occurs rarely in cats treated with glargine in a protocol aiming for tight control of blood glucose concentrations.

Hypoglycemia

An acute hypoglycemic episode can happen to even careful pet owners, since cats' insulin requirements sometimes change without warning. The symptoms include depression/lethargy, confusion/dizziness, loss of excretory/bladder control, vomiting, and then loss of consciousness and/or seizures. Immediate treatment includes administering honey or corn syrup by rubbing on the gums of the cat. Symptomatic hypoglycemia in cats is a medical emergency and the cat will require professional medical attention. The honey/corn syrup should continue to be administered on the way to the vet, as every minute without blood sugar causes brain damage.
A cat with hypoglycemia according to a blood glucose meter, but with no symptoms, should be fed as soon as possible. Hypoglycemic cats that refuse to eat can be force-fed honey or corn syrup until they stabilize.
Mild hypoglycemic episodes can go unnoticed or leave evidence such as urine pools outside the litter box. In these cases the blood sugar will probably appear paradoxically high upon the next test hours later, since the cat's body will react to the low blood sugar by stimulating the liver to release stored glycogen.

Remission

Remission occurs when a cat no longer requires treatment for diabetes mellitus and has normal blood glucose concentrations for at least a month.
Approximately one in four cats with type 2-like diabetes achieves remission. Some studies have reported a higher remission rate than this, which may in part be due to intensive monitoring that is impractical outside of a research environment. Research studies have implicated a variety of factors in successful remission; in general, the following factors increase the likelihood of remission:
Cats may present with type 2 diabetes, at least at first, but hyperglycemia and amyloidosis, left untreated, will damage the pancreas over time and progress to insulin-dependent diabetes.
Glipizide and similar oral diabetic medicines designed for type 2 diabetic humans have been shown to increase amyloid production and amyloidosis and therefore may reduce likelihood of remission.
Approximately one-third of cats who achieve remission will later relapse.

Epidemiology

Diabetes mellitus is rare in cats younger than five years old. Typically, affected cats are obese. Burmese cats in Europe and Australia have increased risk of developing diabetes mellitus; American Burmese cats do not have this increased risk due to genetic differences between American Burmese and Burmese in other parts of the world.