March 27, 2007

Big horsey day at KVC

Twins_2_2 Since we're mostly a dog and cat practice at KVC, it's not every day that we see several horses.  This picture is one you wouldn't see every day, no matter how big a horsey practice you were in.  Twin foals are quite the rare occurrence.  Most mares pregnant with twins undergo spontaneous abortions.  Valuable breeding mares with twin pregnancies are often aborted as a medical procedure.  This is because twins that go to full term are rarely born alive and with no serious complications. It is not uncommon for both twins to die, and the mother may be lost as well.  These foals are five days old.  One is doing great, but the mother is not so happy about number two, and a lot of bottle feeding is going on to supplement her growth.

Janet_face_2_3 Then, just as I'm getting ready to close shop and go to my  C.A.S.A. training session,  my brother's favorite horse, "Janet", is found with a foot-long laceration across his chest.  Fortunately, it's not deep, it's not dirty, it's fresh, and (very important) no pieces are missing.    The camera was low on battery, so no "before" picture (which would have been pretty gross anyway; there was a flap a foot long and six inches wide hanging down like an apron: lots of raw meat).

Janet_wound_2 Here's a close-up of my handiwork.  There are big "tension sutures" about every 3 cm to pull the skin edges fairly close to one another without the stitch material cutting through the skin.  Then I placed simple interrupted sutures about every 1cm to appose the skin edges nicely.   The white thing at the bottom is a penrose drain, to let the tissue fluids out so the skin can stick down. Of course, we had lots of sedative, local anesthetic, and antibiotics and pain medicine to go home.  Horses need pain control, too, just like the rest of our pets (and us).

March 11, 2007

Coggins Testing

Horse_fest__2_ We see mostly dogs and cats at good old KVC, so this is an unusual picture.  Saturday afternoon we had 22 horses on the lot at one time.  The trailers are scrambled around, so I couldn't really get everybody lined up for the group picture (althought the short horses are in front).  They were all here for their spring Coggins Test.

The test is named for Dr.Leroy Coggins, who developed it.  It tests for the presence of the virus that causes Equine Infectious Anemia (aka, E.I.A., "Swamp Fever").  The virus often affects horses in much the same way that HIV affects people.  The horse is unthrifty, won't hold weight, doesn't shed his winter hair, has trouble healing, and just generally ADR (technical abbreviation for "Ain't doin' right").  As you might expect from the name, they frequently become anemic (low on red blood cells).  Sometimes this is so pronounced that the animal becomes weak and disoriented from a lack of oxygen (not enough red blood cells to carry it around the body).  I have taken a blood sample from one horse (in the advanced stages of the disease) who was so anemic that his blood looked like Kool-aid: you could read through it.

There is no preventive vaccine for the disease and no effective treatment to cure it.  Infected horses can remain carriers for years before they show outward signs (sort of like Magic Johnson's dating career before his HIV diagnosis went public).  The disease is transmitted by the bite of large, blood-feeding flies, such as horse-flies and deer-flies (the tabanid family).

As you can imagine, wherever large numbers of horses congregate, so do large numbers of horse-flies.   If your horse is nice and healthy, you really wouldn't want someone to bring in a carrier of E.I.A.  It would be no time before they would want to share your horse-flies, and the next thing you know, your horse becomes a carrier, condemned to an ugly and  premature death.

Since we can't prevent this disease or cure it, the best we can do is to identify the carriers and be sure that they are quarantined away from other horses.  That's why you have to have your "I passed my Coggins Test" paper with your horse's picture on it when you arrive at a horse-show, trail-ride, or horse-sale (also when you sell your horse, even to the guy next door).  That's why lots of horses show up for blood-tests as soon as spring is in the air.

There's one weak point in the program, though.  The incubation period (time from getting exposed to the germ until it shows up in the blood test) is two weeks.  Most events ask for a blood test in the last six to twelve months.  It becomes obvious that an old, moldy blood-test result may not reflect the horse's current disease (or disease-free) status.  If I were buying a horse, I'd have to make the purchase conditional on his passing a fresh, new blood-test, preferably after fly season, in the winter.

October 01, 2006

Sand Colic

"Sandy and the Giant Slime Ball" refers to:

A. The sequel to "James and the Giant Peach"

B. The cleaned up version of "Sandy and the Giant Booger" (too much time around 12-year-old Boy Scouts)

C. The story of how I became covered with Metamucil, among other substances

The correct answer, I regret to say, is : Both B and C.    And now, the prologue...

The horse evolved (or was created, or some combination of both) to be constantly moving and constantly grazing.  His natural diet is grass, or a reasonable facsimile thereof.  It doesn't have a super-high nutritional content, so he has to eat a lot of it.  Therefore he is constantly moving along to find more, and he gets a LOT of roughage.  If you want low fat and high fiber, grass is definitely the way to go, but you have to work at it to get enough to survive.  It takes five to ten acres of pasture per horse if he's going to live on it.

Of course, if you want to be able to find your horse, and catch him and take a little ride, you're probably going to put him in a smaller pen than ten acres.  If you live in an area where farm real estate commands a premium price to buy or rent, your horse is probably in a pretty small enclosure, because that's all you can afford.  We call it a "dry lot" instead of a pasture because a pasture implies grass.  When you have a thousand pound animal constantly walking and eating, the grass goes away pretty fast.  What you're left with here in our part of the country is nothing but sand.

Despite the fact that there is no pasture for your horse to roam and eat, he still has a desire and need to roam and eat constantly, and to take in lots of roughage  in order for his digestive system to work properly.  Hay is troublesome to acquire and bulky to store, so many horse-owners do not feed enough of it, with the horse's nutrition relying heavily on grain (a high-energy concentrate, which is NOT the horse's natural food).  Lack of excercise and inadequate roughage are frequent causes of colic (a non-specific term meaning "belly-ache" when we're talking about horses).

In a small enclosure, the horse is also bored.  In a stall or small dry-lot, there's not much intellectual stimulation, and no opportunity to run like the wind.  So, he needs to "do something" and he wants to eat constantly, but he finished breakfast a long time ago.  Some horses develop little nervous habits.  Some destroy their enclosure by chewing up the wood, in lieu of chewing up grass all day.  An occasional horse looks around and sees that there is a nearly unlimited supply of sand, which could correspond to his nearly unlimited desire to graze.  Fortunately, not many horses make this connection, as sand is NOT good for your gut.  Imagine applying sandpaper to your intestinal lining.  Okay, you can stop now.  I know that didn't feel good.  Now imagine filling your intestine half full of sand from one end to the other.  Feeling a little full? 

When the sand gets to a certain level, the irritation often causes a severe diarrhea.  Abdominal pain can occur, and if it gets bad enough, sand ingestion can even be fatal.  Fortunately, it usually is pretty treatable.

First, the diagnosis.  Aside from colicky signs, plus or minus diarrhea, it's pretty simple to put a handful of manure in a plastic bag, mix with water, and see how much sand settles to the bottom.  Zero sand would be normal.  Visible amounts of sand are always significant.  Since the horse's gut contains bushels of volume, there has to be one heck of a lot of sand in the middle for you to see it coming out the back end.   Getting the sample is generally pretty easy:  you'll find that most horses drop a pile as soon as you load them in a trailer. Sometimes you have to "go fishing".

Usually, if a horse has explosive, profuse, watery diarrhea, the owners mention that in the history... but not always.  Not long ago, I performed a rectal examination on a colicky horse as part of the diagnostic process.  Most of the time, even with diarrhea, the BM comes after you withdraw your arm.  My assistant came into our horse treatment area just as an explosion drenched me from shoulder to toe, but only on my right side.  All he could see was my  perfectly dry) left side from his angle of view, so the noise prompted him to ask, "Did you get any on you?"  I laughed hysterically to keep from crying hysterically.

Peanut the pony came in with colicky behavior and watery diarrhea, and sure enough his stool was full of sand.  The treatment consists of medicine to control pain and cramping, plus a generous (half pound) portion of Metamucil orally, which has to go via stomach tube since they feel too bad to eat or drink.  This stuff is a powder that forms a lubricating gel when mixed with water.  This gel picks up the sand as well as sliding it on through. 

Pumping it through a stomach tube requires a slapstick comedy routine.  One (or more) person restrains the horse, while one holds the stomach tube so it doesn't back out.  Still another person mans the stomach pump, while yet another alternately pours water and powder into the bucket.  The person pumping stirs and pumps at the same time in order to get it through the tube before it turns into un-pumpable jello.   It is easy to make a mess during this process.  If you're treating a tiny pony like Peanut, you have to use a tiny stomach tube.  That means you have to pump really fast.  On Peanut's second treatment, I didn't pump fast enough, and my smallest stomach tube became completely clogged with a six-foot long gelatinous plug (a giant booger, if you will).  We went up to the next bigger tube and finished the treatment, though a rather large amount of slippery goo managed to get in my pockets, shoes, and just all over.  Ponys are generally pretty poorly trained, and Peanut was happy to rear up on his hind legs and step on us while knocking over a bucket or two.   

He only knocked over the bucket, he didn't "kick the bucket".  I became a giant slime-ball, and we changed his name to Sandy.  And now you know...the rest of the story.

September 18, 2006

Consulting with Specialists

We had a horse come in with a runny eye on one side.  He didn't seem to be bothered much by it, but his face was wet and a little gooky (scientific term: things with gook on them are gooky).  Now it just so happens that your tears are made in glands around your eye, they wash over your eye and they then drain into your nose and throat.  If you were a horse (Why the long face, buddy?), they would drain through a long tube (the nasolacrimal duct) that exits in the nostril.  You can actually see the hole about the size of a pencil lead.  When the tube gets stopped up, tears and mucus spill out of the eyelids instead, resulting in "gookiness" of the face.

Usually, you can put a little tube in the hole in the nostril and back-flush the duct to remove the blockage, thereby ending the gooky condition.  This horse was different, though.  I used different tubes and more pressure and nothing was working.  This is NOT a "use a bigger hammer" situation.  Now, admittedly I'm mostly a dog and cat repairman, but horses were once my primary interest and I've done this quite a few times in the last twenty-eight years.  Things were not going according to plan, so I decided to call a specialist at the University teaching hospital. 

See, I'm a general practitioner.  I've got to be a little bit of everything: eye doctor, dentist, pharmacist, surgeon, radiologist, dermatologist, internist, lab technician, groomer, janitor, baby-sitter, you name it.  This means that I can't be a specialist expert in every one of those fields, to say nothing of being an expert in every field and every species.  That's why it's great to have access to people who are highly specialized, who see nothing but the weird, difficult cases in their narrow field of interest and expertise.  Few of my clients can afford to take their dog out of town to a veterinary oncologist (cancer specialist), but that doesn't mean they don't want the best possible treatment that they can afford.

I spend a fair amount of time on the phone with the faculty at the College of Veterinary Medicine.  In the last four years, we have had a specialty group in Memphis, Tennessee.  This group has an eye specialist, two internal medicine specialists, a top-notch surgeon, and a cancer specialist.  I also make use of top specialists across the country through the resources of VIN (Veterinary Information Network).  For a pretty significant fee, I post my cases over the internet with their history and labwork and pictures, and several nationally known specialists help me out when I need it.

In the early years, there were many things that I just hadn't seen yet.  They really weren't that tough. I'd get the consultation and they would tell me the answer that was so simple for them and so elusive for me.  I'd feel dumb, but happy that I had the answer to fix my patient.  That doesn't happen so much anymore.  Oh, I still have lots of questions, but now they aren't so easy to answer.  My signature line on VIN is "I'm lost, but I'm making good time."  By this I mean that I've done lots of diagnostic testing and investigation, but I still don't have the answer.  This means that there are no simple answers for my case.   The specialists often compliment me on the thoroughness of my workup, and comment on what a challenging case it is.  I'd much rather have them  make me feel dumb and fix things for me. At least things would be fixed instead of "challenging".  (You don't want to be a "challenging" case when you go to the doctor.  You want to be boring, dull, every-day ordinary.)

Back to the gooky-faced horse.  I told the Equine Center receptionist the general nature of my problem and they put an intern on to speak with me. Interns are very sharp young veterinarians who have graduated in the past year and are at the vet school for intensive training to become specialists.  I told her all that I had done and she replied, a little crestfallen, "I thought this would be an easier question... I'll have one of the ophthalmologists get back to you." 

Twenty-eight years or one year twenty-eight times: I can do the simple stuff (and some not so simple).  It is nice to have specialists available when I need them.