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Constipation is a relatively common
problem in older and overweight cats. The predisposition to a nerve-muscle
breakdown in obese and geriatric cats that leads to a slowing or
retention of fecal matter in the colon is the most popular theory
for the mechanical cause of constipation. This can be a life-threatening
problem at any age but especially in the older cat.
As the transit time of fecal matter
decreases due to the inadequate strength of muscular contractions
more and more water is absorbed from the colon resulting in dehydration
of the stool. This loss of lubrication in turn makes it more difficult
for the cat to evacuate the fecal material. In addition, as the
stool collects the size of the colon increases and stretches the
muscles causing fatigue. All of the toxic waste products that are
normally eliminated on a regular basis begin building up in the
bloodstream.
If this process happens slowly or
intermittently you may not notice anything wrong with your cat until
the process has advanced to a serious degree. In most cases the
cat will initially strain to defecate in the litter box and later
go off its feed, become depressed and even vomit as the condition
progresses with time. A chronic and /or recurrent condition will
result in weight loss. Clinically, the diagnosis of constipation
is made by palpating the abdomen and discovering an enlarged colon.
The goal of treatment is to remove
the obstruction without releasing an "avalanche" of toxic
products to the rest of the body. Often the cat must be anesthetized
so that the stool can be re-hydrated by a warm water enema in order
to remove the fecal balls. Supportive care such as lactated Ringers
solution, steroids, antibiotics and a heating blanket are often
necessary as well.
Prevention focuses on trying to discover
an underlying cause. Changing to a high fiber diet that will retain
water in the colon for a longer period of time is a common approach
to managing this problem. In some cases changing to a diet with
a higher digestibility and thus lower the volume of stool may be
more effective. Supplementing with oral medication such as Lactulose
to help lubricate the colon and slow the absorption of toxic waste
is often given. Nerve-muscle stimulants such as Propulcid are needed
in the more severe cases. As a last resort some cats will only respond
to surgery rather than to manipulating the diet and dispensing medication.
In most cases the problem gets worse
with time and the constipation episodes become more frequent. Constant
vigilance is needed in these cases along with consistent use of
medication and strict adherence to the prescribed diet.
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