Ken Crump, AHT, Animal Cancer Center Colorado State University
Chemotherapy is a word that creates an instant emotional response in everyone.
Chances are that you, or someone you know, has experienced chemotherapy for
the treatment of cancer. The reality of chemotherapy for animals is generally
different from that for human cancer patients. Most people are pleasantly surprised
at how well their pets feel while undergoing chemotherapy.
Adriamycin® (doxorubicin) is a broadspectrum chemotherapy drug used to fight
many forms of cancer and has been used for decades. Adriamycin® is an orange-red
liquid, which is diluted and painlessly administered directly into a vein. The
slow intravenous administration of Adriamycin® usually takes about 15 to 20
minutes. The patient lies quietly on a padded table during administration and
rarely needs any form of sedation.
Practically all anticancer drugs have side effects. However, their potential
effect against the cancer generally outweighs the possible side effects. Although
serious adverse effects can occur with any chemotherapy, there is less than
a 5% chance that your pet will be hospitalized with side effects and less than
a 1% chance of fatality. Below are listed the potential side effects of Adriamycin®.
Our goal is to make you as aware of the possible side effects as possible. Please
consult your pet's doctor with any questions you may have about chemotherapy.
Hair Loss (Alopecia)
When a person loses hair as a result of chemotherapy, it can be devastating.
Pets rarely lose their hair, and if they do, they are not bothered by it as
much as people are. In most pet animals, hair does not grow continually throughout
their lives like it does in people. Therefore, hair loss in pets is rare. Exceptions
are certain breeds of dogs, such as poodles, Old English Sheepdogs and other
breeds whose hair grows continually. In general, if your pet needs to visit
a groomer periodically to be clipped, then your pet may experience some degree
of hair loss as a result of chemotherapy. Cats may, however, lose all or most
of their whiskers. Please ask your pet's doctor about the possibility of hair
loss in your pet.
Reduction in the Number of White Blood Cells (Neutropenia)
There are various types of cells in the blood. The decrease in the number of
infection fighting white blood cells is known as neutropenia. Many chemotherapeutic
agents impair the bone marrow's ability to produce cells. As a result, neutropenia
may occur seven to ten days after chemotherapy. Neutropenia, alone, is not a
danger to your pet. However, your pet's ability to fight off infection is impaired
by neutropenia. Your pet is given a complete physical, and a blood test called
a complete blood count (CBC) is performed prior to each Adriamycin® administration.
Should your pet have a significant reduction in the number of white blood cells,
your veterinarian may wish to perform periodic blood tests, and/or prescribe
antibiotics to protect your pet from infection.
Stomach or Intestinal (Gastrointestinal) Discomfort
Many patients experience some form of stomach or intestinal discomfort two to
seven days after a chemotherapy treatment. Your veterinarian will prescribe
medication to try to prevent or treat the discomfort. Below are listed some
steps you can take at home.
· Upset stomach (Nausea)
1. If your pet begins to show any signs of upset stomach (drooling, 'smacking'
lips) or loss of appetite, administer the medicine your doctor prescribed
for nausea.
2. Offer ice cubes every few hours.
3. After 12 hours, feed your pet small, frequent meals instead of one large
meal.
4. Call your veterinarian if you have concerns, or if the condition persists
for more than 24 hours.
· Vomiting
1. Do not give your pet any food or water for 12 hours.
2. After 12 hours, offer your pet ice cubes, then water, then small bland
meals.
3. Call your veterinarian if you have concerns, or if the condition persists
for more than 24 hours
· Loss of Appetite
1. If your pet begins to show any signs of upset stomach or loss of appetite,
administer the medicine your doctor prescribed for nausea.
2. Offer your pet four small meals a day.
3. Add warm broth, animal fats, and favorite foods to increase flavor and
appeal.
· Diarrhea
1. If your pet begins to show signs of diarrhea, administer the medicine
your doctor prescribed for diarrhea.
2. Keep water available at all times.
3. If your pet is also not eating, offer chicken or beef broth.
4. Give Pepto Bismol® (dogs only), 1 tablespoon per 10 pounds of body weight
every 4 to 6 hours.
5. Call your veterinarian if you have concerns, or if the condition persists
for more than 24 hours.
Tissue Damage
If Adriamycin®, is accidentally given outside the vein, severe tissue reactions
can result. Therefore, Adriamycin is handled with the utmost care, and is only
administered by highly trained professionals. If irritation of the injection
site develops in the form of pain or redness, apply ice packs for 15 minutes
every three hours. Call your veterinarian if you have concerns, and certainly
if the condition persists for more than 24 hours.
Allergic Reactions
Allergic reaction to chemotherapeutic agents is rare, and not a problem you
will have to treat at home. Should your pet have an allergic reaction to Adriamycin®,
it would develop upon administration, and your veterinarian and the hospital
staff are trained to treat patients for allergic reaction.
Heart Damage
Adriamycin®, in some rare cases, can irreversibly damage the heart muscle. The
dose of Adriamycin® prescribed for your pet is below the dose that usually causes
heart disease. Less than 10% of our patients develop heart disease as a result
of Adriamycin® chemotherapy. Your veterinarian will discontinue the use of Adriamycin®
if heart disease is detected at any time.
Each Visit
It is important to make an appointment for each chemotherapy administration.
At each visit, a doctor or an oncology nurse will admit your pet. We work as
a team to minimize the time you and your pet will spend at the hospital. This
team approach maximizes quality care. This may mean you might not see the same
veterinarian or nurse each time, but the intent is to provide the most comprehensive
and compassionate care possible.
You will be asked how your pet has been doing since the last visit. This
is a good time to express concerns you have about your pet's condition and let
us know if you need refills of any medications. Your pet will receive a
complete physical examination by a doctor, and blood will be drawn for a complete
blood count.
Once the blood values have been reviewed, and are determined to be within normal
limits, your pet will receive an Adriamycin® treatment. This entire process
takes two to three hours. You may wait in the lobby during this time, or you
may leave your pet in our care and return later in the day. Stop by the Business
Office at the completion of each visit to keep your account current.
|
|