Diary of a Fourth-Year Vet Student: You Are Getting Very Sleepy

Anesthesiology is one of the more arcane aspects of human and animal medicine. When you do surgery, the animal is reduced to the square of tissue in your operating field. When you do anesthesia, the animal becomes patterns of breathing, heart rate, blood pressure, blood oxygenation…a bunch of numbers collected by machines and sensing devices, and sometimes the old fashioned way with your fingers on a big artery to count pulses or checking for eyelid reflexes or mucous membrane color (should be pink always!). By altering the amount of inhaled anesthetic gas, changing fluid rates, and starting and stopping drugs from the dozens we have available to us, we can affect all of these parameters. 

For me, being in charge of anesthesia for a procedure is super stressful—you are keeping the animal alive despite the terrible things being done to its body, and not just alive but keeping certain physical parameters within specific limits. Your attention cannot waiver. You have to keep one ear open to the chatter coming from the surgical team--they may initiate procedures that will have a dramatic effect on the status of the patient but they might forget to alert you in advance. You may have half a dozen different screens to monitor. And you are constantly recording things--physical parameters, when you give drugs and how much you give and where you give it...complicated but also very interesting from a physiological perspective.

I have been thinking pretty deeply about anesthesia for the past week as I completed the first week of my three-week anesthesia rotation. In one short week, I managed to rack up my "big four"--a cardio case (I ended up with two big ones), a cat, a horse, and giving an epidural injection to any species (I gave one to a dog).

Students are also responsible for placing IV catheters. I was pretty worried about that since I haven't had much success with small animals, but I have to say that I was rather successful this past week. I placed IV catheters in every one of my patients, and with the exception of one dog, I got the catheter placed correctly in a single needle stick (in that particular dog, I got it placed correctly with the second stick in the same leg). My tally includes a 12-year-old cat with chronic renal disease, a French bulldog, and an elderly long-haired doxie. Those particular dogs are difficult because they have short, deformed legs and veins with strange anatomical placements. Weird anatomy trivia: veins often vary from the ideal, arteries rarely do. The cat--well, it's a cat. You have a limited amount of time before any cat decides it is done with all of your nonsense. They have thin skin, fragile veins, and with renal disease they can also have low blood pressure. So my successes are a bit more meaningful because they include these difficult patients.

I also had to place a temporary venous catheter in a horse during a procedure so that we could give it some antibiotics. Horses are always trying to die so they nearly always require a dobutamine CRI (continuous rate infusion) added to their IV fluid line to keep their blood pressure up. All of that was going into the catheter placed in the horse's jugular vein so I had to use another location for the antibiotics (some drugs do not play well with others). The horse was in dorsal recumbancy (on his back) and the room lights were off since the procedure was laparoscopic and the surgeons needed to see their monitors. The anesthesiologist told me to palpate a particular vein on the bottom of the horse's jaw (which was fully exposed). I couldn't see the vein in the dark, and only vaguely recalled its position from first-year gross anatomy class, but I could feel it. And by golly, I put that catheter in the vein in one poke. In the dark. It was amazing and empowering to me for the anesthesiologist to act as if he was completely confident of my ability to do this, no matter what he may have been thinking.

I did not have the best experience with anesthesia during my junior small animal surgery lab although things got quite a bit better during my junior large animal surgery lab. And now I find that I am really enjoying a rotation that I was initially dreading. 

CircusK9 Update, Long Overdue

During September, I will be traveling for two back-to-back, poultry-related preceptorships. I hope to be able to write more about them later, but for now, I wanted to put up a brief post about the dogs.  I've been so focused on vet school recently that I haven't written much about the general mental and physical state of the pack.

In the past couple of months, I've interviewed 8 or 9 people to see how they would work out for pet-sitting. And as I introduce the dogs to these new people, I am reminded of origin stories that I have sort of forgotten, that have become buried in my other quotidian concerns.

Azza will be 8 years old at the end of this year (she was born near the end of December, 2010). Azza still acts like a puppy for the most part: playful and joyful. In large part, I credit this to the fact that she lives with fox terriers. She is so much more resilient at facing the random events that life throws at her. Not quite a normal dog, but I worry about her much less than I used to.

Mimi is rounding the corner on 13 years, and has lost most of her upper teeth, yet will play fetch with a tennis ball until she drops. She is going deaf, and has started vocalizing nearly continuously, a sort of low moaning sound. Her Parkinsonian-like tremors have become quite extreme, present even when she is at rest, and often while she is sleeping (they only disappear when she is in REM sleep). Despite my advanced training, I can't explain what is wrong with her. She is not ataxic, she knows exactly where her body is in space, she has no muscle weakness, and she has no pain from this disease. She does have two lumps that I plan to have my vet poke (technically, collect a fine-needle aspirate from them). I am fairly sure they are lipomas, but it is better to be sure. They have nothing at all to do with her tremors.

From the day that I brought Archie home, Azza has been convinced that I did so for her. Whenever I go looking for them inside or outside the house, I invariably find them together, touching paws or laying side by side. They are true partners in crime, always looking for trouble.

Archie is a spoiled little monster, and I love every second of it. It was a bittersweet email that I got from AKC telling me he was ranked the #11 smooth fox terrier in AKC agility this year. He doesn't even have a single double-Q to his name! And this entire year will be a holiday from both training and trialing. A fourth-year vet student has some downtime, but not that much. It was clear from our last few trials that he needed a bit more maturing, so this "gap year" may not be the worst thing that could happen to his agility career. I am focusing instead on building my relationship with him. I must admit that I ignored some basic training in favor of driving him forward in agility. Time for re-collection.

More Musings on Vermin

I ended up trapping four black rats, one male the first night, and three females over two more nights. They were identical to the male in appearance but slightly smaller. Then the trap remained empty for about a week even though I baited it each night with delicious, fresh vegan offerings. The depredations on Beast's sprouting grass seeds and my compost bin seem to be at an end for now.

I have recently tackled a new vermin problem: yellow jackets. The bastards are out in force in the PNW during this very dry summer. Archie is normally a fearless little fox terrier, but he is absolutely turned to jelly by yellow jackets ever since he was attacked by a swarm of them. They are so numerous that they are covering my hummingbird feeder ports and driving the birds away too. Time to reduce their numbers, at least locally.

Here is a picture of one of my traps taken this morning. I put this trap out, freshly baited, about 24 hours before this photo was taken.

Here is a picture of the trap taken just a few minutes ago. The blurry bits in the pic are more soon-to-be victims. The bodies mount up and it is so satisfying. Not quite the same level of satisfying as climbing into a freshly made bed, but very, very close.

Diary of A Fourth-Year Vet Student: Doing The Things!

Some rotations are significantly better than others with respect to doing actual vet things to real animals. In this photo, I am opening up an abscess on the left front leg of a piglet, probably caused by a bite wound from his pen mates as piglets are bitey little things with needle-sharp teeth. A nice pus fountain ensued. This little piglet was lucky--the abscess was outside the joint capsule so he got to keep the leg. I flushed the wound with saline and dilute iodine and we sent him on his way.

This pig is owned by the university. I have been somewhat reluctant to post photos of animals owned by clients. Issues of confidentiality come into play. Lots of clients are quite happy to have us take, and use, photos of their animals. But there is always that one person who will raise a stink.

During that same therio (reproduction) rotation, we had a very interesting surgery earlier in the week on another piglet. He had been castrated at the university swine center, but they could only find one testicle. So they carted him up to the hospital a few days later to see if we could find the other testicle. Everyone suspected it was still inside his belly, as it is fairly common for one or both testicles to not fully descend. Usually they are lurking near a structure called the inguinal ring. Surgery with general anesthesia is required to remove these testicles but it is a standard procedure. We ultrasounded his belly first but could not find a structure that we were sure was a testicle. We opened him up anyway, fully expecting to be in and out in 30-40 minutes tops.

Only one problem: we couldn't find the other testicle. We couldn't find anything that even looked testicle-ish.

After diligent searching for over an hour, all we could find was the structure in the picture below.

This tiny bifurcating structure is a uterus! The large red loops to the lower left are his small intestine, which we had to exteriorize so we could see inside better. They are red because they are getting dehydrated and a bit angry. They were stuffed back into the piglet a few minutes after this photos was taken.

The piglet had retained Müllerian tissues. This is a simplification, but the default state of developing mammalian embryos is female. For male gonads to develop, cascades of several key hormones have to be produced that suppress further development of the female (Müllerian) tissues, cause regression of those tissues, and begin development of male (Wolffian) tissues. The timing of these multiple hormonal cascades is pretty important too. If one of those cascades begins too early or too late, there can be some unusual developmental consequences. In this case, the result was a piglet with a single testicle and a tiny uterus. The piglet lacked the rest of the Müllerian duct (cervix and vagina) and if he had ovaries, they were really tiny. So these tissues weren't ever going to be functional in the sense that they could be used for reproduction. But these kinds of tissues are tricky--they can begin to produce hormones later in the life of the mammal that can lead to metabolic disorders and cancer. So we removed everything we could find.

Biology and physiology are certainly amazing.