Hello again from
Littleton!
I hope everyone
is having as great of a summer as I am!
I have been learning so much here as always and have been getting to
spend some time with family in Boulder doing fun outdoor activities. There have been a lot of neat cases here
lately, and I’m excited to share some of what I’ve been learning here with you.
Things have been
going pretty much as usual around here lately with a lot of colic and lameness
work. There have been a few horses that
have come in with septic joints or that have been suspected to have them, so I
have been able to watch and help with several regional limb perfusions. Regional limb perfusions are great because
they utilize a tourniquet proximally and infusion of a concentration-dependent
antibiotic such as amikacin distal to the tourniquet to achieve a high
concentration of antibiotic in the area of concern. This is also favorable because you can avoid
some potential complications that could result from systemic use of
antibiotics.
One interesting
case that came in was a 4-month old foal that was referred in because it had
had seizures over the few days prior.
The owner started noticing the seizures occurring after it ran into a
fence and was treated for head lacerations.
Luckily for me, I was working in the ICU the day that the foal was
admitted so I was able to follow its case and observe it very closely for a few
days. Initially, the foal was somewhat
obtunded mentally and was suspected to be blind, but upon ophthalmic exam was
seen to have pupillary light reflexes and a dazzle response. Its menace responses were absent, but those
are a learned behavior so they may not have been developed yet in this
foal. Radiographs of the head were
unremarkable, and the owner declined to have an MRI performed.
The foal also
had some concerning lacerations over two of its fetlock joints, so it was
sedated and Dr. Hill distended the joints with sterile saline to see if the
lacerations communicated with the joints.
One had a small communication and was flushed and infused with amikacin,
but the other joint was intact. The foal
did not have any seizures over the next few days, but over the weekend started
having them daily. Dr. Mullen made a
great point by suggesting that either the foal could have had seizures because
of the head trauma from running into the fence, or could have run into the
fence because it was having a seizure.
She was more inclined to believe that due to the fact that two weeks
after the traumatic event that the foal was still having seizures, that it was
more likely to have idiopathic juvenile epilepsy rather than being simply
trauma-induced. Initially, the foal was
treated with an IV fluid cocktail that included DMSO to help with any potential
edema in the brain and later was medicated with phenobarbital and gabapentin to
control the seizures. Once the dose was
adjusted, the owner elected to take the foal home.
Speaking of
neurologic cases, there was a horse that came in that the owners said appeared
to have acutely developed neurologic signs when ambulating. We had a slow afternoon in the ICU, so I was
able to observe Dr. Hill and Dr. Kurkowski work up its case. When the mare arrived, she was hypermetric in
all of her limbs and really hesitated to set down her feet when moving
forward. When she was moved in circles,
she didn’t appear to be particularly neurologic—she wasn’t circumducting her
hind limbs (swinging them outward when moving) too much and didn’t seem to have
any proprioceptive deficits (she appeared to know where her feet were). On physical exam, the vets noted that she had
increased digital pulses in all four limbs, and increased digital pulses
indicate pain in those distal limbs that have the stronger pulses. She also had a positive response to hoof
testers in all four limbs, particularly over the toe region. Due to the quick onset of her signs and the
clear indications of foot pain, she was most likely laminitic. To further assess whether her odd movement
was due to pain instead of being neurologic in origin, the vets then did an
abaxial sesamoid nerve block with carbocaine in both front feet to block any
pain that might be originating from the foot, as would be expected with
laminitis. The difference in her
movement was very dramatic, and she moved almost normally after the nerve
blocks. Radiographs were then taken and
did show early indications of some rotation, so the mare was treated for
laminitis with ice boots and anti-inflammatories. She did well, and was sent home a few days
ago.
As always with
veterinary medicine, not all cases have a happy ending. Fortunately, the vast majority of the colic
cases (and all cases in general) that I have seen here have been successfully
treated, but some horses that require surgery to correct their colic
unfortunately do not have that option due to owner constraints. Other times, horses are not able to arrive
until it is too late and some part of their GI tract has ruptured, which is
beyond repair. Last night, two emergency
colic cases arrived late in the evening.
One was a horse in its early 30’s that had been seen in the field and
was suspected to have a strangulating lipoma but needed further evaluation to
be sure. This horse did not have a
surgical option. Ultrasonography
revealed some even distention of the small intestine but good motility and
passage of digesta rather than it “settling out”, or rather seeing the digesta
sitting in the bottom on the intestine and not filling it and moving
through. An abdominocentesis was
performed (in other words, a belly tap) and lactate was evaluated, which was
not significantly elevated. These were
good findings for the horse, because a high lactate (should normally be below
2) indicates poor perfusion (lack of blood supply), and a very high lactate
suggests that there is likely dead bowel somewhere in the abdomen. So, what was expected to be a bad case ended
up going pretty well, and the mare was instead treated with IV fluids and
monitored closely because she did have a number of signs of dehydration.
Sadly, the other
colic that came in was not expected to be as severe as it turned out to be, and
the lactate on that horse’s abdominocentesis was 17. Combined with the other findings on her workup,
the owner elected to euthanize her. I
observed and helped take part in the necropsy, which helps the vets and the
owner to know definitively what went wrong.
This is helpful, as sometimes a horse’s cause of death is preventable,
otherwise can help assure an owner that they made the correct decision, and is
a good learning tool for the veterinarians involved as well. This horse did in fact have a strangulating lipoma (a growth of fat that can
tighten down over a loop of intestine, block food from passing through it, and
cut off its blood supply) and as a result had several feet of very dead
ileum. The owner definitely made the
correct decision for the circumstances involved in this case. Other cases have been highly rewarding, such
as a horse that survived colic surgery that had a 720 degree torsion at the
base of her cecum, and two year old that did not have a surgical option and
survived medical management for a suspected right dorsal displacement. Although such cases are highly rewarding and
others are very sad, I am so appreciative that as veterinarians we are able to
alleviate suffering in either situation.
I wish I could
share all of the other neat things I’ve been seeing here lately but seriously,
I’d be writing a novel. I saw an OCD the
size of a golf ball removed from a hock, a horse that was referred in to have a
vaginal cyst removed but here was found on pre-surgical exam to be an intact
hymen, a “sidewinder” horse (a neurologic horse that moves sideways everywhere
it goes), and a mare that fractured her coffin bone while playing in the
pasture. This weekend they’re having an
open house here, and I’m very excited for my family to see where I’ve been
working. Also, they’re having pony rides
and face painting so my 2 and 5-year old nieces will be happy campers. J
Although I love vet school, I am truly not excited for my time to be
dwindling down to my final two weeks here.
I’ll save the sappy goodbyes for next week, and I’ll give you all one
more post after my final week.
-Calli
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