Disease

Cats’ eyes are complex arrangements of delicate structural components that need to operate harmoniously in a normal, healthy animal to enable keen vision. Unfortunately, things sometimes go wrong with one or more of these components as a result of disease, aging, traumatic injury or genetically acquired defects. Cataracts can seriously impair a cat’s vision and even cause blindness. Compared to the frequency of its occurrence in humans and dogs, however, this ocular disorder is rarely seen in cats, says Thomas Kern, DVM, associate professor of ophthalmology at Cornell University’s College of Veterinary Medicine. Nevertheless, all cat owners should be able to recognize the physical and behavioral signs of this disorder and understand the special needs of a visually impaired feline.

Each year, numerous cats are brought into to veterinary clinics throughout the U.S. showing the telltale signs of respiratory distress: labored breathing, chest constriction, wheezing and coughing. In most cases, the animal will be diagnosed with asthma, a mechanical constriction of the airways, or bronchi, the narrow network of tubes that lead directly from the trachea to the lungs. The narrowing of the airways occurs when a cat’s immune system overreacts to the presence of an allergy-producing substance, such as cigarette smoke, dusty kitty litter or pollen and responds to the presence of the allergen by releasing stimulants that cause a swelling of the tissue (mucous membrane) lining the bronchi. But while asthma is by far the most common cause of feline respiratory difficulty, veterinarians will often refrain from diagnosing it definitively until they have reviewed the results of a microscopic examination of the patient’s feces. Why? Because such a procedure could reveal the presence of lungworms in the animal’s respiratory tract — a situation that would produce asthmalike clinical signs but would require a significantly different approach to treatment.

Whether happily playing with its favorite toy, vigorously pursuing a tiny mouse, or frantically fleeing from a dangerous predator, all of your cats activities rely on the controlled transmission of electrical signals among the billions of nerve cells (neurons) that are jammed into its little brain. In a normal cat, the transmission - or firing - of these signals is well controlled within the central nervous system. These neurons either fire or are inhibited from firing according to an animals shifting needs and desires. In the brains of cats affected with the disorder known as epilepsy, however, this elegant process goes awry.

Urethral obstruction (UO) is a relatively common medical condition in male cats that usually requires emergency treatment (see related article on page 3 of this issue). Standard treatment - which involves medical stabilization of cardiovascular and metabolic derangements, correction of electrolyte abnormalities with IV fluid administration, and relief of the obstruction by urethral catheterization - may require a number of days in the hospital at considerable expense. The study ("A protocol for managing urethral obstruction in male cats without urethral catheterization," Journal of the American Veterinary Medical Association, 2010) involved a clinical trial involving 15 male cats with UO where standard treatment had been declined by owners due to cost issues.

While youre watching your favorite television show in the family room, you hear a familiar retching sound from the kitchen. Boomer is vomiting up his dinner again. As you clean up the mess, you wonder if its just hair balls - or something more serious that requires a trip to the veterinarians office. Cats vomit for numerous reasons, ranging from benign dietary indiscretion to potentially fatal systemic diseases such as renal failure or hyperthyroidism. The experts say that cat owners should pay close attention to a cat that becomes sick to his or her stomach.

Chronic renal failure is a progressive, irreversible disease that slowly leads to impaired kidney function and serious consequences. The kidneys contain nephrons which are responsible for filtering the blood, removing waste products and regulating electrolytes. In CRF, the nephrons die, and waste products begin to accumulate in the body. Electrolytes may become imbalanced in CRF, leading to problems such as hypertension, seizures, muscle weakness and heart problems.

According to a recent Ohio State University, our pets can get sick from stress - just like us. The study found that otherwise healthy cats show signs of illness when stressed. And cats diagnosed with feline interstitial cystitis (FIC) became healthier when stress levels were reduced, the study showed. Twelve of the 32 cats in the three-year study were healthy, while 20 had FIC, a chronic pain syndrome that affects the cats bladder. According to researchers, lower urinary tract diseases occur in about 1.5 percent of house cats, and many pet owners cant tolerate the mess that accompanies it. As a result, millions of sick cats are put down or relinquished to shelters every year.

Among all acquired feline ear disorders, the most common by far is otitis externa, an infection of the outer ear canal that, if untreated, can progress to the inner ear, damage the ear drum and seriously compromise an animal’s hearing as well as its sense of balance. The most common cause of this unpleasant condition and its potentially deafening consequences is an assault on the ear by an outside invader, the ear mite. In some cases, however, the culprit is an organism that normally resides harmlessly within a cat’s ear — a one-celled fungus, or yeast, known as Malessezia.

As you cope with the frigid temperatures that come with winter, you may make it a habit of adding antifreeze to the radiator of your automobile. This substance-a bright green, syrupy chemical called ethylene glycol-serves to lower the freezing point of water and will certainly help to keep your car running smoothly throughout the colder months. Keep in mind, however, that ethylene glycol, if ingested by your cat, can prove deadly within a matter of days if the animal does not undergo prompt and expert veterinary treatment to get it out of its system.

Diabetes mellitus (DM) is one of the most common endocrine diseases found in cats, and insulin therapy has become the most effective means to achieve blood glucose control. Clinical remission is not an uncommon finding in cats with well-controlled diabetes, though few studies have explored predictors of remission. In this study ("Predictors of clinical remission in cats with diabetes mellitus," Journal of Veterinary Internal Medicine, 2010), data was retrieved from the medical records of 90 cats with newly-diagnosed diabetes. The data collected included history, signalment, physical examination findings, hematology, biochemical profile and the occurrence and duration of remission. Remission was defined as normoglycemia without insulin longer than four consecutive weeks.

Any surgical procedure that will be painful to your cat will require that the animals pain perception be dulled, if not totally blocked, by an anesthetic of some sort. Understandably, some cat owners find the notion that a pet will be placed under anesthesia a frightening prospect. "Theres always a risk," acknowledges James Flanders, DVM, an associate professor of surgery at Cornell Universitys College of Veterinary Medicine. "But if the cat is known to be in generally good health and if the anesthetic drugs are used properly, the chance that something will go wrong is very slim."

Intestinal disorders rank among those most frequently treated by veterinarians at local clinics and large referral hospitals throughout the U.S. According to Melanie Craven, BVM, an internist and researcher in gastroenterology at Cornell Universitys College of Veterinary Medicine, vomiting, diarrhea and dramatic weight loss are the most common signs of feline intestinal disease in cats. However, she notes, subtler signs such as lethargy and appetite fluctuations can also suggest the presence of an intestinal disorder. Some of these disorders may be secondary to conditions originating in other organs, such as the thyroid gland, liver, kidneys and pancreas. But according to Dr. Craven, the problems usually originate in either the upper or lower segments of a cats intestines.