Tranq Seizure?! - The Horse Forum
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post #1 of 4 Old 07-12-2010, 02:51 PM Thread Starter
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Tranq Seizure?!

My friend's horses were just tranquilized to have their teeth floated. The vet gave the gelding a half dose, then another half dose when the first wasn't enough. I wasn't there, but this is the story I got: with the second half dose, the vet went THROUGH the vein that carries blood to the heart, instead depositing the tranq in the vein that goes to the brain. As a result, the half dose (I wasn't there so I don't know the exact measurement on what her 'half dose' was) went straight into his brain and resulted in a pretty bad seizure. After thrashing and smashing his head and running around literally on his chest (couldn't get his front legs under him I guess) he seems to be ok. The vet says there are no side effects to this. Has anyone had any experience with this / some input?
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post #2 of 4 Old 07-12-2010, 05:38 PM
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Oh my god that's terrifying! My horse is getting his teeth floated/ sedated next week

I'm glad your friend's horse seems to have come through OK but oh boy I would not be a happy camper :(

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post #3 of 4 Old 07-12-2010, 05:57 PM
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What was he being sedated with?
I know sometimes when horses are tranqed with Ace they have what appears to be the "opposite effect". Instead, it happens if the horse isn't sedated heavily enough and is exposed to the stimulus. The horse is "with it" enough t understand that something is loud/scary/whatever but not enough to understand that the stimulus isn't a big threat. This often leads to disasterous reactions... people think it's an opposite effect of the drug, but it's the horse not knowing what is really going on - they just know they don't like something and want to get away RIGHT NOW!

So, my thinking is if they tried to float the horse's teeth and it wasn't cooperative and added more sedative, the horse was already exposed to enough of the stimulus before the 2nd half kicked in to have the above happen... if the horse was sedated with ace.

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post #4 of 4 Old 07-12-2010, 10:05 PM
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Yes, this can happen and it can happen with any drug that is accidentally injected into the artery rather than into the vein. Even a very experienced vet can do this accidentally because the artery and vein in the neck run right along together and the difference in the color of the blood is not great.

A second dose of Ace wouldn't cause this type of reaction just because it was a second dose of ace or even if the horse was hyped up and fought through the sedative effect.

She should watch her horse carefully as there could be damage related to the trauma of the seizure.

Cindy D.
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