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Case
History
Inflammatory Bowel Disease (IBD)
Cauda Equina Syndrome
(also known as Spinal Stenosis, Lumbosacral Stenosis,
CES)
UKC GSD/WS
GRCH U-AGII BISS RBIMBS AWSA WSCC FORB RBCSWO
CH CRYSTALS LADY IN RED KYRA HC (S/D) HT PT HCT WETT
PDX O-VCCX RB/ASCA CD NA CPEL1 FDCH DSA AM/CN CGC TDI TT
DSA
OFA (H&E) CA TH VWF 65% CERF (02) UKC DNA-P
Date of Birth:
September 20, 1995
Owner: Judy Huston
Breeder: Pam and Larry Koons |
Sire: AWSA UKC
WGSDCI WSCC CH U-CD REEVES ROYAL ANGUS VON TASZ, CDX TT HC CGC OFA
H&E (Excellent)
Date of Birth: October 28, 1992 - May 8, 1999 (Bloat)
Owner Jean Reeves
Breeder Diana Updike
Dam: WGSDCI CH
Hoofprint Emerald Ashlee CGC, TDI, TT, CD, FDCH, OFA(H&E)
Date of Birth: February 27, 1991 March 14, 1998 (Inoperable
tumor on spine)
Owner Pam & Larry Koons
Breeder Joanne Chanyi
The two
diseases are covered in this same case history because 1) they
were both diagnosed the same week, and 2) the symptoms of the
IBD critically delayed the diagnosis of the CES.
Kyras history
leading up to the diagnosis of IBD: Kyras history will include
possible relevant information beginning when she was a puppy.
Keep in mind that at no time up to the diagnosis did I believe
that Kyra had any significant problems with diarrhea. Since she
was so healthy until she turned 6, I can remember saying that
if Kyra had an Achilles heel; it was diarrhea simply because
if she showed any symptoms of anything, it was occasional soft
stools or diarrhea. I, like so many shepherd owners, was told
that a lot of our dogs had this and basically, not to worry
about it. Since it happened relatively few times over the course
of her life, I wasnt concerned. Becky Joyce and I used to have
similar problems -- often at the same time, with Kyra and her
littermate, Star. While they were still quite young, we changed
their food not only because we were so into the healthy
alternatives, but because we needed to find a food that did not
result in soft stools. Star, unlike Kyra, seemed to move away
from manifesting symptoms of diarrhea or soft stools to having
her problems show up as allergies. Kyra, too, has allergies, but
nothing she was ever treated for or that gave her obvious
problems. Remember, however, that there is a school of thought
that says IBD is an allergy and this is why she is on a
hypoallergenic diet.
November, 1995
Changed food from Eukanuba Puppy to Wysong
February 28, 1996 Diarrhea 24 hour fast, Metronidazole &
Centrine
November 29, 1996 Diarrhea/Giardia Treatment Metronidazole
January 14, 1996 Changed food to Global Best Breed German Dog
diet
April 18, 1997 Changed food to BARF Bones and Raw Food
August 19, 1997 Fecal test/Giardia Moderate
April 7, 1998 Fecal test/Giardia Mild
November 1998 Changed food to Wendy Volhards Natural Raw Diet
September 2001 Anal Gland Infection Antibiotics
November 2001 Straining to defecate Impacted stool
Dec. Jan. 2002 Alternated between constipation and diarrhea
with considerable straining, but the bloody mucus was the final
straw. Vets tried her on a variety of medications none of which
helped. They tried Bethanehol, Sulfasalazine, and more. She was
vomiting and had blood in her stools.
January, 2002 Bloodwork, urinalysis, x-ray, ultrasound showed
she had a very enlarged bladder they called it Bladder Atony.
She had lost her ability to urinate more than tiny amounts and
her bladder got larger and larger. She was put on
Phenoxybenzamine (Dibenyline) 3X day.
January 18, 2002 Bowel Biopsy
January 23, 2002 Confirmed diagnosis from Colorado State of
Severe Eosinophilic ulcerative colitis/proctitis.
Kyras history
leading up to the diagnosis of CES: Keep in mind that Im
mentioning the incidents that occurred in Kyras life simply
because they may have been signs of weakness and in some way
related to the spinal stenosis. Anyone that knows Kyra
personally knows that she is a highly energetic, non-stop, throw
herself around, charging kind of dog so Im somewhat surprised
she didnt have more injuries. But, you guys will be the
ultimate judge of symptoms as you keep your own dogs history.
Maybe these are relevant maybe not, but this is part of the
whole tracking process. By tracking, we can learn!
September 26,
1997 Lifting back left leg Possible sprain kept her quiet 10
days
April 22, 2000 Swollen painful left hind dewclaw MSU thought
it might be a soft-tissue injury, while my holistic vet thought
it was the result of a wasp sting. Either way, they said rest
her.
August, 2000 Door slammed on her tail yelped
October, 2000 Herding judge and handler commented about her
broken tail
November, 2000 Chiropractor confirmed break and said it wouldnt
regenerate
March, 2001 Slammed into a log in our log home, extreme pain,
had:
3 neurological exams found nothing wrong except tail
2 x-rays found a touch of Spondylosis
Bloodwork normal
Urinalysis normal
Acupuncture
Chiropractic treatment
Occasionally,
over the years, she would ask for help to get in the Expedition
(big vehicle), the Explorer, or on the bed after a full day of
activities. She never limped or cried out from pain or showed
any other indication of a problem. I, and those people who knew
my relationship with Kyra, figured it was just one more way I
babied her. She would sometimes put her front legs on the
vehicle and look over her shoulder at me as if to say, Ill
take a boost please. She would sometimes do the same thing to
get on the bed, but five minutes after I helped her up, she
would get down and then get up again by herself, so I never knew
if there was a real problem or not. With her diagnosis of spinal
stenosis, it looks like there could have been discomfort.
Now, the
symptoms begin to blur into the same signs and symptoms I gave
above for the IBD. Im sure she was straining because she had
IBD, but Im also sure she was straining because of the nerve
damage that had already occurred and was gradually taking away
her ability to urinate or defecate on her own.
Also, sometime
during the year 2002, Kyra began to urinate more often and
smaller amounts. NOW, we know that this is a manifestation of
the nerve damage that was taking away her ability to urinate at
all on her own. Then, no matter how often I asked vets and
breeders and friends about whether females marked territory like
males do, or said that I wanted her to have another
urinalysis, no vet picked up her bladder problem until January
2002 when an x-ray showed the large bladder and she was given
the diagnosis of Bladder Atony. The pressure on the disc was the
problem.
January 21,
2002 Neurological exam at Oakland Veterinary Referral Services
Remarks taken from Kyras records at OVRS: Bleeding from rectum
(fresh blood), there is a flaccid anus and there is no rectal
tone on rectal examination; there is flaccid tail paralysis, the
urinary bladder palpates large, and there is moderate to high
resistance to bladder expression.
Neurological
examination:
Mentation: alert and responsive
Cranial nerves: normal
Gait: normal coordinated gait, no weakness or ataxia noted
Postural reactions: normal conscious proprioception & hopping
responses
Spinal reflexes: normal femoral and sciatic reflexes, no
vulva-anal reflex
Pain perception: no spinal hyperesthesia, there is decreased
pain perception to tail, Perianal sensation is intact
Rectal examination: flaccid anus and rectum, fecal impaction
Lesion localization: pelvic and Cd nerve/nerve root lesion (cauda
equina) vs. lesion affecting sacral and Cd cord segments
Main differential diagnoses: chronic intervertebral disc
disease L7-S1, spinal canal stenosis (L7-S1, neoplasia
Diagnostic
Tests
Abdominal ultrasound showed mild generalized bowel thickening
compatible with possible inflammatory bowel disease or bacterial
overgrowth
CT of lumbo-sacral spine; findings were compatible with Type
II disc disease (there is soft tissue opacity in the spinal
canal over L7-S1 instead of dural sac, nerve roots and epidural
fat).
Treatment on January 23, 2002: Nerve route decompression, Dorsal
laminectomy L7-S1 confirmed disc protrusion. A discetomy and
nucleotomy of the L7-S1 disc were performed.
BOTTOM LINE:
The primary indicator for Kyra of Cauda Equina Syndrome (spinal
stenosis) was her decreased tail movement. Three weeks before
her surgery she competed in agility and completed requirements
for four titles. She jumped and moved beautifully. I was very
pleased with her level of performance. In other words, unlike
some other dogs with this condition, she was not affected in any
obvious way with pain, or anything that affected activity or
performance level. We can only look back over her history and
wonder if each of the individual symptoms and incidents
throughout her life was in some way connected to the spinal
stenosis.
There should
NEVER be another White Shepherd owner on this list or related to
anyones dog on this list to go undiagnosed as long as it took
for Kyra. We have had dogs with both Cauda Equina Syndrome
(Spinal Stenosis, etc.), and Degenerative Myleopathy (some
earlier cases of spinal stenosis may have been mistaken for DM).
Anyone with any dog with any of the symptoms Kyra expressed or
that other dogs with this condition exhibited, needs to ask
their breeders or their breeders breeder, if there was ever a
diagnosis in their line. They also need to know that, contrary
to feedback I got from my chiropractor and a couple of vets,
dogs do not break and lose the use of their tail. Dogs may break
their tail, but breaks heal.
And, in Kyras
case, her two overt symptoms in retrospect, were the frequent
urination and the paralyzed tail. Now I would know enough to
say: all the tests performed so far were not enough, she needs
to have a CT scan, she needs to have an ultrasound and x-ray,
and I need to do some diet trials. Maybe, as a result of my
experience with Kyra, you can help your dog sooner than I could
help mine. Here is a place where I have much regret. I was so
convinced that the raw diet was the only healthy way to go. I
was put off by the commercial dog food industry and by the very
idea of feeding a dog dry kibble versus fresh meat and
vegetables that I could not hear anyone who told me otherwise. I
listened to the raw food experts and the alternative specialists
and felt that if I gave my dogs that dry processed food I would
be condemning them to poor health. Please keep in mind that this
happens to be my personal opinion about processed food and Im
sure it stems from earlier in my life when I was interested
enough in nutrition to earn a degree in it.
I still believe
that processed food whether for our dogs or for ourselves is not
the healthiest way to go, but I also understand that if a dogs
system cannot take the food being offered in the raw diet, then
it is ridiculous to continue to feed them that way. In the case
of a dog like Kyra with a predisposition to IBD, did the raw
diet exacerbate her problems? Would she have been diagnosed
severe if she had not had bones and raw food when her system
couldnt handle it? I dont know. So, after years of feeding my
dogs raw, Kyra is now on a Hypoallergenic diet -- Hills Ultra
ZD. My other three dogs are on the commercial Wellness Fish and
Sweet Potato diet by Old Mother Hubbard. I still give the other
three marrow bones to help keep their teeth clean and then let
Kyra have the bone to chew after all the fat is out of it, and I
still sneak Zeus, the Malamute, turkey necks or chicken wings as
a treat once in a while.
Just like there
are humans who believe the only way to eat a healthy diet is for
it to be natural, fresh, and organic, there are people who feel
the only way to feed their dogs is the same way. Obviously,
there is a huge range to pick from and more than one method that
can work for us and for our dogs. Dog food companies have become
very aware of the consumers desire for better food for their
dogs and they are responding. There are more alternatives out
there than ever before.
Kyras
treatment plan since the diagnosis and surgery. The first few
months were spent trying to keep her elimination going. She
could not urinate on her own and so I had to manually express
her bladder many times each day. This was truly the hardest
thing I had to do physically since it took a great deal of
strength and the aches and pains I experienced almost stopped me
a number of times. She needed exercise in order to get her
bladder going so although the winter of 2002 was a very cold
one, we spent a lot of time outside. This was a time to reach
out to friends because I found myself up against a wall when I
was told Kyra could not be catherized any more and I could not
express her, nor could my vets. Debbie Martin came over from
Canada accompanied by Joanne Chanyi and Lynda Proulx to help me
learn how to manage Kyra. By the end of the day, as I watched my
friends drive off, I was relieved that we had expressed her
twice and I was ready to handle it on my own. It was never easy,
but anything can be handled one day at a time and the feedback
and encouragement I received that day helped me keep on going.
The rest of my
attention was in trying to get her bowels regulated by food,
medication, exercise, monthly acupuncture and chiropractic (no,
not the same chiropractor who assured me not to worry about
Kyras tail), body balancing with QXCI machine (up to 3 times
per week for 3 months) and anything else I could think of (homeopathic
remedies, consultations, herbal drops). The foods and drugs we
tried and/or are trying include:
Best Breed German Dog Diet (I started with this after her
surgery lots of stools and diarrhea)
Hills Ultra ZD (In August, after a bad flare-up, we switched
her to this food and it worked great)
Select-Care, Sensitive (Nerve damage caused Megacolon and we
decided to try a new food)
Hills Ultra ZD again since the Select-Care didnt work.
Valium for her bladder
Amoxicillin post op
Phenyoxbenzamine (Dibenyline) for Bladder Atony ($7 each in U.S,
$222/180 pills from U.K.)
Sulfasalazine for the IBD
Prednisone for the IBD
Propulsid/Cisapride for the IBD
Metamucil for IBD
Aloe-Vera for digestion
Spectrobiotics to keep gut balanced
Bethenachol (for bowels although more commonly used for bladder)
Herb Lax A Shaklee product made up of herbs.
Other medications for bladder infection and e-coli infection
Oct. to January
she had many enemas, The nerve damage caused Megacolon so were
been trying new food, IV drips, and finally a colon cleanse
under anesthesia.
Her coat has
grown back.
She has
attended 3 herding clinics since this is obviously an outdoor
activity and her bowel problems can be overlooked. Her attitude,
energy, drive, and overall zest for life has not diminished one
iota. My other three dogs cant keep up with her.
White Shepherds
with a diagnosis of Inflammatory Bowel Disease and Cauda Equina
Syndrome:
Day's All That Jazz, OFA H/E, TT, HC, CD. Born May 25, 1993,
died November 3, 2001. Sire, Hoofprint Sundance. Dam Hoofprint
Day Light Star. Sibling: Day's I.Q. Breeder: Debbie Martin
Crystals Lady in Red Kyra (See above)
White Shepherds
with a diagnosis of Inflammatory Bowel Disease and Perianal
Fistulas:
Royal Mason Dixon Lilly White. Owner: Donald Dobbs. Breeder
Jean Reeves. Sire: Reeves Royal Angus Von Tasz, Dam: Moonshadows
Royal Starburst. Date of birth: April 2, 1997. Treatment:
surgery for the PF.
Royal Dinah of Willow Wood. Owner: Jacki Wheeler, Breeder Jean
Reeves. Sire: Royal Sir Isaacs IQ, Dam: Moonshadows Royal
Starburst. Currently, as of 2/4/03, she is undergoing the
treatment with Cyclasporin. This is an expensive drug with a
treatment time of 2 months.
Crystals Chancellor. Owner: Dave & Linda May, Breeder: Pam &
Larry Koons Reeves Sire: Reeves Royal Angus Von Tasz, Dam:
Hoofprint Emerald. Treatment with food and antibiotics. The
diagnosis of PF is uncertain at this point.
Other White Shepherds with a diagnosis of Lumbosacral Stenosis
Braeheads Bow Wow Samantha, Sire: Lyndons Angus, Dam:
Braeheads Alexis Special, Owner: Jeff Marks, Breeder, Susan
Ewart, As of Christmas 2002, Samantha is still walking a mile
each day at the age of 9.
Crystals Lil Pistol Von Tasz. Owner: Michelle Koons.
Breeder: Pam and Larry Koons. Sire: Moses Lacsar Von Tasz, Dam:
Hoofprint Emerald. Luger has no symptoms from this condition
which was discovered when tests were performed for other
reasons. He is already 10 years old and is one of our top
performance dogs and is still going strong.
Kyras progress
as of September 3, 2003, just 17 days before her 8th birthday
She maintains a
weight between 72 and 75#. She is energetic and as driven to
play and be involved as she always was. She urinates totally on
her own. She has four meals each day. Her medication still
includes 10 mg. of Prednisone every other day, 1 Dibenyline (for
bladder), and 2 Bethanacol in the morning and 2 Bethanacol at
bedtime to help motility of her bowels. She has a bowel movement
about every three days. Her coat is still plush and is white
again she had a lot of staining from the diarrhea, bleeding,
etc. She has monthly chiropractic and acupuncture treatments.
She is competing in agility and in herding but at a much slower
and easy-going pace. Were having a lot of fun and Im thankful
to have a second chance with her.
Comments from
Debbie Martin
Having been responsible for breeding a dog that was affected
with both Inflammatory Bowel Disease and Cauda Equina Syndrome,
I have had to learn much more about these diseases than I ever
wanted to.
CES is a
malformation of the spine. It is often referred to as an
instability of the spine. This instability can cause discs to
protrude and compress the spinal cord. It may cause swelling
within the spinal column that will also compress the spinal cord
or it may be a narrowing of the spinal cord (spinal stenosis)
that also puts undue pressure on the spinal cord.
Initially, CES,
may or may not cause neurological symptoms of the hind legs,
anus or urinary system, but the malformation will lead to
eventual loss of control of the bladder, bowel and often the
hind legs.
This
instability can be extreme, as in Kyra and Jazz's case, or may
be mild enough that obvious symptoms are not exhibited until the
dog is much older. Many German Shepherds have been diagnosed as
having Degenerative Myelopathy in their older years, when in
fact, they may actually have CES. CES is now believed the number
one cause for German Shepherds that lose control of their hind
end as they age.
In extreme
cases, the first symptom of CES is the tail. The tail will be
painful and the dog may lose the use of their tail. As in Kyra's
case, her accident with the door may have been because she
already could not control her tail enough to get it through the
door before it was closed.
The reason for
the confusion in obtaining a diagnosis, is that the only way CES
can be diagnosed is by MRI or CT scans. Normal x-rays do not
reveal the malformation of the spine.
The only
correction possible in the extreme manifestations of this
disease, is spinal surgery to relieve the pressure on the Caudal
Equina Nerve bundle. If surgical correction is not done, there
will be loss of bowel and bladder control. Surgical intervention
has a 100% success rate if it is done before the nerves
controlling the bowel and bladder are affected. Once the bowel
and bladder have been affected, the improvement from surgery is
greatly decreased because the nerves have already suffered
extensive damage from being compressed.
Inflammatory
Bowel Disease is often found in dogs that have CES, not always,
but often enough to be noted. No one knows what the connection
is.
In Jazz's case,
she did not have chronic diarrhea or difficulty defacating, but,
any change of diet would cause her to have explosive diarrhea.
This reaction to food was extreme enough, that when Jazz was
eventually euthanized due to injuries sustained in a car
accident, I asked for permission to have bowel biopsies
performed post-mortem. It was confirmed that Jazz had
Eosinophilic Enteritis.
IBD is another
disease that is difficult to diagnose. It is also a disease that
differs in severity from dog to dog and is a disease that is not
commonly seen by the veterinarian. The only sure method of
diagnosis is a bowel biopsy, which is an invasive and expensive
procedure. German Shepherds are noted for their "touchy"
digestive system. I suspect that this disease is more common in
our dogs than we would like to think. It is also a disease that
has varying degrees of severity. It is also a disease that will
worsen with repeated flare-ups. The damage to the bowel is
cumulative. In most cases, the simplest way of confirming the
presence of this disease, is by doing a food trial. If changing
the food relieves the symptoms, then the assumption can be made
that there is an inflammatory process in the bowel.
IBD is commonly
controlled with a combination of diet and medication. This
disease is never cured.
Both of these
diseases require early intervention to minimize damage.
As Judy has
said, it is important that we all understand these diseases.
These diseases are not common in the general dog population and
our veterinarians may need our guidance and knowledge of the
diseases that affect our dogs, to be able to obtain a correct
diagnosis and develop a treatment plan.
Description of
IBD and links to websites and help lists
VETERINARY INFORMATION SERVICE
Inflammatory
bowel disease (IBD) usually refers to a chronic inflammatory
disease anywhere in the gastrointestinal (GI) tract, including
the stomach, small intestine (duodenum, jejunum, ileum), and
large intestine (colon) The term implies a process of long
duration as opposed to sudden onset. Because IBD affects many
areas of the GI tract it probably has many different causes.
More traditionally, IBD has referred to chronic inflammation of
the small or large bowel excluding the stomach. The disease is
classified by the predominant inflammatory cell found invading
the wall of the bowel. Such classification may allude to its
cause.
However, this
method of grouping is not always possible and location of the
lesion will help its classification.
IBD is usually
found in younger dogs but, it can extend to middle age dogs.
There is no strong relationship by breed however, IBD does seem
to affect some breeds more often than others. The most common
form of IBD is lymphocytic-plasmacytic IBD (LPIBD). This term
describes the cells that are found microscopically when a biopsy
of the leison is examined. Most biopsies are obtained by
abdominal surgery or by endoscopy if available. Biopsies are
important to rule out other causes such as: dietary
hypersensitivity, lymphoma, histoplasmosis (a fungus), bacterial
infection or overgrowth, and malassimilation problems. The
predominant cell type, lymphocytes and plasma cells represent a
chronic stimulation of the immune system.
Because of this
response, IBD is typically thought of as an immune mediated
disease and therefore treated with the various immunomodulating
therapies. Current thoughts are that the GI tract has been
sensitized by some bacteria or food antigens that determines the
ongoing immune response. Complexes are formed from antibodies
against food antigens, bacteria or bacterial byproducts. These
antigen-antibody complexes (ABC) induce the release of
destructive chemicals into the area and tissue destruction
results. The destruction is indiscriminant. The quantity of
ABC's produced may influence the long standing nature of the
disease.
Signs of IBD
are dependent on the location of the problem. Disease in the
stomach or upper small intestine are frequently associated with
chronic vomiting and weight loss. Diseases of the jejunum,
ileum, and colon are associated with chronic diarrhea, weight
loss and infrequent vomiting. Small bowel diarrhea is often
watery with a large volume of feces and the patient acts sick.
Large bowel diarrhea is associated with straining, some blood,
mucus, small volume of feces and frequent attempts to defecate.
Once IBD is
suspected, strict dietary changes are fundamental for long term
results. Often diet will control the disease but in the majority
of cases anti-inflammatory drugs are added to quiet the immune
system. Often, the use of anti-inflammatory drugs at the
beginning is enough with controlled diet to stabilize the
chronic inflammation. However, the disease in most cases goes
into periods of remission with repeated flare ups. Certain
breeds (Wheaton Terriers and Basenjis) are more predisposed to
progressive disease.
Diet is chosen
to produce the least amount of ABC stimulation. A true
hypoallergenic diet should contain a very good single protein
source that is highly digestible, so as not to be available for
immune stimulation. There are now commercial diets available
through veterinarians and some knowledgeable pet food stores
that contain only one source of a hypoallergenic protein such as
lamb, rabbit, turkey, venison, fish or duck. Many diets listed
as hypoallergenic contain other ingredients and caution is
order. These are usually combined with a good source of
carbohydrates such as rice or potatoes. Commercial diets insure
that essential vitamins, minerals and fatty acids are included.
Fiber is often a vital component of long term care. Quality
fiber aids in the development of beneficial colonic flora and
enhances the digestive process. In addition, diets free from
preservatives and food additives may provide relief for some
patients that are sensitive to these chemicals.
Anti-inflammatory therapy involves immunosuppressive drugs,
metronidazole, or Salycilates. The mainstay of anti-inflammatory
drugs are corticosteroids. Prednisone and methylprednisolone
are powerful anti-inflammatory drugs that can produce impressive
results. They have minor short term side effects that include
increased drinking, eating and urinating. Long term, these drugs
can cause Cushing disease if alternative therapy can not be
achieved for control of IBD. Sulfasalazine is commonly used to
control large bowel IBD. It has no long term side effects,
however it can cause a dry eye syndrome and occasionally will
cause salicylate toxicity. Metronidazole is used because it is
anti-inflammatory, anti-protozoan, and is a good antibacterial
for the small bowel. The only side effect is vomiting. Other
drugs that are being tried include cyclosporine and
eicosapentanoic acid, a fatty acid found in fish oil.
Eicosapentanoic acid(Derm Caps) is a drug often used in
veterinary medicine to decrease the inflammatory response of
inhaled allergies. The only side effects are a shiny coat.
IBD involves a
great deal of patience by the dog owner but most dog will gain
relief with some variation of therapies. The disease is life
long and will require regular attention.
1/16/97
Veterinary Information Services
DISCLAIMER:
THIS ARTICLE IN NO WAY ESTABLISHES A CLIENT-VETERINARIAN
RELATIONSHIP. THE INTENT OF THE ARTICLE IS TO COMPLIMENT THE
USERS CURRENT VETERINARY EDUCATION. NO CLAIMS ARE MADE AS TO
CONTENT. THIS ARTICLE IN NO WAY REPLACES THE CLIENT-VETERINARIAN
RELATIONSHIP.
Description of
CES with links to websites and help lists
Lumbosacral Stenosis (Cauda Equina Syndrome)
by Holly Frisby, DVM
Drs. Foster & Smith, Inc.
Veterinary Services Department
Lumbosacral
stenosis has also been termed lumbosacral instability,
lumbosacral malformation, lumbosacral malarticulation, lumbar
spinal stenosis, lumbosacral spondylolisthesis, lumbosacral
nerve root compression and cauda equina syndrome. All these
terms describe arthritis of the joint between the last lumbar
vertebra and the sacrum, which is one of the bones that makes up
the pelvis. This arthritis narrows the canal through which the
spinal cord and nerves pass through. The intervertebral disc
between the vertebra and the sacrum is often abnormal as well,
further narrowing the canal. The arthritis and disc disease put
pressure on the nerves coming off the spinal cord. The symptoms
of lumbosacral stenosis, then, are a result of nerve injury.
What are the
symptoms of lumbosacral stenosis?
The most common
sign of cauda equina syndrome is pain. The pain may occur in the
back, in one or both hind legs or the tail. The dog usually has
difficulty rising from lying down but once he begins to walk
about he works out of the stiffness. There may be muscle loss in
one or both rear legs. The dog may have difficulty urinating or
defecating because of the pain, may become incontinent, or may
be unable to urinate. Some dogs are unable to move their tail,
or have severe pain if the tail is moved. Often dogs will have a
shuffling gait, and scuff their toes. Some dogs will chew on
their pelvic area, hind limbs or tail, sometimes creating
considerable damage by this self-mutilation. Many of the signs
seen with lumbosacral stenosis can mimic those of hip dysplasia,
and the two conditions need to be differentiated.
Which animals
are at risk of having lumbosacral stenosis?
Lumbosacral
stenosis occurs most commonly in large breed dogs. German
Shepherds appear to be more likely to develop this condition.
The condition can be acquired, meaning the dog started out
normal and then developed this condition. Or lumbosacral
stenosis can be a congenital condition, meaning the dog was born
with the abnormality. Either way, the symptoms generally do not
occur until the dog is between 3 and 7 years of age.
Lumbosacral
stenosis is rarely seen in cats.
How is
lumbosacral stenosis diagnosed?
The
veterinarian will ask the owner for a history of when the
symptoms developed, etc. A physical exam will then be performed.
The hind limbs will be manipulated in various ways to determine
which positions are painful. The veterinarian will also do a
neurological exam, including testing the reflexes, to determine
which nerves may be injured.
Radiographs (x-rays) are taken to
evaluate the spine and pelvis. The findings can be very
suggestive of lumbosacral stenosis, but are not sufficient to
make the diagnosis. To achieve a diagnosis, special procedures
must be performed by injecting dye into the affected area and
re-radiographing. Depending on where the dye is placed, the
procedure is called myelography, epidurography, or diskography.
These procedures must be done under anesthesia. Displacement of
the dye by the abnormalities in the bones and intervertebral
disc confirms the diagnosis of lumbosacral stenosis.
How is
lumbosacral stenosis treated?
Depending on
the severity of the condition, amount of pain the animal is
experiencing, overall health of the animal, financial
restrictions, and other factors, lumbosacral stenosis is treated
surgically or nonsurgically.
Nonsurgical
treatment: If the condition is mild, dogs may be treated with
strict rest for 6 to 8 weeks. Anti-inflammatory medications such
as prednisolone are given. In many cases this can relieve the
symptoms. However, when the dog becomes more active, the
symptoms can return.
Surgical
treatment: There are two different surgical techniques used to
treat lumbosacral stenosis. In the first, the bones are fused
together in as normal a position as possible. This prevents
abnormal motion between them, and reduces the risk of further
arthritis. In the second technique, part of the bone and the
intervertebral disc are removed to reduce pressure on the spinal
cord and nerves.
In either case,
dogs must be confined for 2 to 4 weeks after surgery, and may
also be placed on Prednisone therapy. For dogs who have
difficulty or are unable to urinate, the bladder must be
manually expressed several times a day.
What is the
prognosis for dogs with lumbosacral stenosis?
The outlook for
dogs with lumbosacral stenosis is dependent on the severity of
symptoms before treatment. Dogs who are mildly affected may be
able to return to normal function. For those who are incontinent
or unable to urinate prior to treatment, the prognosis is much
poorer.
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