Expert health and behavior advice from the feline care professionals at Paws, Whiskers & Claws
The Feline Hospital

Your cat’s kidneys are essential to her health. Their main functions are to filter protein waste from
the blood, regulate the level of essential nutrients such as potassium and phosphorus, maintain
hydration, and produce urine. They also help to regulate the cat’s blood pressure, body
temperature, and the production of red blood cells.
What is Chronic Kidney Disease?
Chronic kidney disease (CKD) occurs when the kidneys slowly stop performing their main functions, leading to a buildup of toxic waste products in the cat’s blood. The kidneys are amazingly efficient, so your cat won’t show signs of illness until at least 75% of her kidney function has been lost to disease. For that reason, damage to the kidneys has probably been happening over a period of months or even years before signs of kidney disease become obvious. A cat with healthy kidneys can concentrate and eliminate the filtered waste products with a normal amount of water intake. In the early stages of kidney disease, the kidneys can no longer concentrate the waste products as efficiently, so they need to excrete them in a lower concentration with higher volume (more urine which is dilute). This is known as compensated renal failure. After approximately 75% of the kidney tissues are destroyed, there is a rapid rise in waste products in the bloodstream and you’ll see what appears to be the sudden onset of kidney disease. CKD is most commonly seen in older cats; only about 10% of cases occur in cats less than 3 years old. Often the early signs of disease, such as weight loss and poor coat quality, are dismissed as normal aging changes. Other signs, such as drinking and urinating a lot, mislead owners to think that their cat is well-hydrated and that her kidneys are functioning normally. In fact, the opposite is true. With CKD, your cat is simply unable to drink enough water to make up for the kidney disease. A cat with CKD is constantly dehydrated, which leads her to drink more and more frequently.
What causes CKD?

CKD is often the end stage of other illnesses. It can result from a number of reasons, including:  Congenital malformation of the kidneys;  Bacterial kidney infections (pyelonephritis); Paws, Whiskers & Claws, 736 Johnson Ferry Road, Suite A-5, Marietta, GA 30068  Glomerulonephritis - damage caused by toxins, drugs, inflammatory  Neoplasia - various cancers of the kidney, most commonly  Amyloidosis - the build-up of a type of protein that prevents the kidney  Viral infections such as feline leukemia or feline infectious peritonitis;  Aging – the most common cause of CKD and the most common geriatric How is CKD diagnosed?
Usually your vet will diagnose renal disease by checking the level of two waste products in your cat’s blood - blood urea nitrogen (BUN) and creatinine – as well as the urine specific gravity, which is the measurement of how concentrated the urine is. Additional tests for substances such as potassium and phosphorus, or to check for anemia, urinary tract infection and white blood cell (WBC) count may be required in order to determine the best treatment for your cat. Could the kidney disease have been diagnosed earlier?

Early diagnosis is difficult because signs of the disease usually aren’t evident until there has been significant loss of kidney function. PWC recommends a blood chemistry profile for all senior pets at least once (if not twice) each year in order to check BUN and creatinine, and a urinalysis to diagnose kidney disease at its earliest detectable level. You should always monitor your cat’s drinking and elimination habits. If you notice excessive thirst and urination, contact your vet right away. How does CKD affect my cat?

Because the kidneys perform a variety of different functions, the clinical signs of renal disease are not the same in every cat. The most common signs are increased thirst and urination, weight loss, poor coat quality, bad breath, variable appetite (which may be associated with ulcers of the mouth, esophagus and/or the stomach), vomiting, lethargy, and depression. Sometimes kidney disease is seen as sudden onset blindness that is secondary to high blood pressure. High blood pressure can cause cats to act in ways that you might refer to as cranky, easily agitated, or aggressive towards people and other animals. Illness, pain or discomfort often causes cats to behave in an unusual way. They may hide, be less social, and change their eating and elimination habits. They may also feel too weak to get to the litter box, food and water. What treatments are available?

Depending on the results of blood tests, your cat may be diagnosed with multiple conditions that require different treatments. Most cats with CKD can be effectively managed with diet change and one or two of the other treatments listed below. Paws, Whiskers & Claws, 736 Johnson Ferry Road, Suite A-5, Marietta, GA 30068 1. Diet
A diet of high-quality protein in lower amounts and low phosphorus will lower the
level of waste products in the blood. These prescription diets are only available at
a veterinarian’s office. PWC carries a variety of canned and dry kidney diet foods.
The canned diet is preferred because it adds more water to your cat’s diet, but
both can and dry should be offered daily. Your cat should be allowed to eat as
much of these diets as she wants.
However, it is most important that your cat eats a high-quality food regularly. If
your cat won’t eat the kidney diet, there is a dietary supplement that may be
added to your cat’s regular food. This supplement binds to the phosphorus in the
food and removes it from the body, which reduces the work required from the
kidneys. If you have multiple cats with different dietary needs, we can help
simplify feeding so that all of their nutritional requirements are met.
2. Subcutaneous (SQ or Sub Q) fluids
Your cat’s body may need help in removing the waste products from the blood.
Because dialysis is not readily available in veterinary medicine, your cat may
need SQ fluids. If this becomes necessary, we will teach you how to administer
these at home, or you can bring the cat in and wait while we administer the fluids
for you. The process takes only about 5 minutes.
It may seem daunting to think about inserting a needle into your cat to give
fluids, but it’s actually a simple procedure that gets easier with practice. There
are detailed steps available in a separate handout, and our staff will give you a
hands-on lesson. We have lots of tips to make it easy for you and your cat!
The amount and frequency of fluids will be determined by your vet, and may be
adjusted after periodic rechecks of your cat’s blood.
3. Antibiotics
If your cat has a urinary tract infection, antibiotics may be prescribed.
4. Potassium supplementation
Cats with renal disease tend to lose too much potassium in their urine, which
leads to muscle weakness, stiffness, poor hair quality, and decreased appetite.
This may not be evident initially in either the blood work or your cat’s behavior or
appearance. It may occur after SQ fluids are begun, so potassium levels will be
checked regularly when SQ fluids are given on a steady basis. There are a few
ways to supplement potassium: in the SQ fluids, as well as orally in gel or tablet
form, or a powder that can be mixed with food.
5. Anti-ulcer medications
Kidney disease may cause the blood and bodily fluids to be more acidic. This can
lead to nausea, vomiting, or ulcers in the GI tract. We may recommend Pepcid
AC as directed by the veterinarian. The generic of Pepcid AC, called famotadine,
is a less expensive, equally effective alternative. Pepcid AC and famotadine are
available without a prescription from any pharmacy. We will instruct you on how
much and how often to give this medication if needed.
Do not use any other variety of Pepcid except Pepcid AC; Pepcid Complete is not
Paws, Whiskers & Claws, 736 Johnson Ferry Road, Suite A-5, Marietta, GA 30068
6. Blood pressure medication
Many cats with kidney disease also have high blood pressure. In some cases, the
blood pressure may rise before the BUN or creatinine levels rise. Lowering the
cat’s blood pressure not only helps them feel better but also protects the kidneys
from the damage that high blood pressure can cause.
Alternatively, blood pressure may be low (due to dehydration) to normal at the
time of diagnosis. If SQ fluids are given, you are adding volume to the body and
re-hydrating your cat, so the blood pressure may rise too high. For these reasons
we will often recommend periodic rechecks of blood pressure, even if it was
normal initially.
Blood pressure in cats is treated with an inexpensive human medicine that can be
purchased from us or from any pharmacy.
7. Treatment of anemia
The kidneys initiate the production of red blood cells in the body. Many cats with
CKD are anemic. This can make them feel weak, lethargic and leads to loss of
appetite. Like low potassium, this is often not apparent until after the start of SQ
fluids. There is medicine that can help stimulate red blood cell (RBC) production if
your cat becomes anemic.
8. Treatment of low body temperature
Cats with advanced CKD can have difficulty maintaining their body temperature.
They’ll appreciate having soft bedding in a warm, sunny location. Consider giving
your cat a Snuggle Safe, which provides hours of warmth without electricity.
9. Treatment of high phosphorus
Blood levels of phosphorus can rise above normal in CKD and this makes cats feel
badly and cause other problems in the body. There are no medications to lower
the phosphorus in the blood. Subcutaneous fluids will help dilute and flush
phosphorus out. Prescription kidney diets are low in phosphorus. Additionally we
can use phosphorus binders which bind to phosphorus in food and escort it out of
the body in feces so that it never enters the bloodstream. These phosphorus
binders can sometimes decrease the palatability of food for a cat that already
may not want to eat, so we may not be able to use these phosphorus binders in
some cats.
10. Enteric (GI) Dialysis
Azodyl is a capsule supplement given by mouth 1-3 times a day. It is beneficial
bacteria that metabolize and flush out kidney toxins that have diffused from the
blood stream into the bowel. This helps slow down the buildup of kidney toxins in
the blood, helping your kitty feel better. Azodyl can be used in addition to or, in
some cases, instead of SQ fluids.

AVAILABLE AT ALL TIMES because they tend to urinate frequently and
dehydrate quickly.
Make sure that there’s fresh water available on every floor
of your home. It’s also a good idea to encourage them to eat by also providing
additional food bowls.
Paws, Whiskers & Claws, 736 Johnson Ferry Road, Suite A-5, Marietta, GA 30068 Because these cats must drink so much water, they will have an increased
urgency to pass large volumes of urine. You must provide additional large
litter boxes throughout your home.

How long can I expect my cat to live?

Most cases of CKD advance very slowly, especially when caught early. With treatment and regular rechecks as prescribed by your veterinarian, your cat can have many good, active years ahead. In some cases after approximately six months of SQ fluid treatment, the remaining normal kidney tissue can hypertrophy, or enlarge, and essentially compensate to some extent for the damaged kidney tissue. The best prognosis comes with early detection and intervention with treatments recommended by your veterinarian. We recommend screening all cats for kidney and other common geriatric diseases annually starting at 8 years of age. Paws, Whiskers & Claws, 736 Johnson Ferry Road, Suite A-5, Marietta, GA 30068


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