Possible Narcolepsy, SD or?

Vintage

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Hi everyone.

My 36 year old veteran tonight displayed some very unusual behaviour. He had previously been mooching around his stable while the OH and I were skipping out, he will happily pass back and forth checking you out and generally being friendly. I had my back to him when my OH pointed out something was wrong.
Pony had his eyes shut, and his head was rapidly lowering. I went to reach for his head when I saw his back end dropping and his legs buckling and he staggered. He opened his eyes briefly when I had hold of his head, he almost paused and then all 4 legs buckled again sinking lower and he staggered against the wall. It was very much like he had been given a GA and was slowly sinking back ready to lay down. He had several slaps on the nose and seemed to wake up and right himself on all 4, paused for a minute and went over to my OH wondering if he had food.

Pulse was 34, 10 mins later was 40.

He is a PPID pony and is treated with prascend and a low sugar diet, he is also mostly blind in his right eye and his left isn't overly clever. He does 'nap' but has never displayed such a sudden thing before.

His energy levels have dropped recently as he was no longer on oil, which he is now back on, and though it was lateish, he was still active right up to this point where he suddenly seemed to drop off. There had also been no fireworks going off to cause a lack of sleep, so I am unsure. He seemed fine and ate his dinner afterwards with no problem.

Any thoughts?
 
Has he been laying down ok? No pain to stop him doing so? My girl has something - my vet thinks narcolepsy, another thinks SD. I'm still not sure! She falls asleep, her head drops to the floor and she gradually gets more and more wobbly until she wakes herself up. She looks sedated. I have videos if you want to compare.
 
Tarrsteps what was the cause in the cases you've seen do you know?

Off the top of my head, one had undiagnosed arthritic changes in the ankles, one had an advancing neurological deficit. In both cases the thought was they were not lying down enough and sleeping soundly enough to get REM sleep - horses need very little relative to us but they can't hold out forever. Some of it seems to be mechanical - the horse can't get up and down easily so stops trying - but I believe there is also the feeling that, as prey animals, horses are very sensitive to the stress of feeling vulnerable. Apparently it can happen in horses that are being bullied, too.

I did have another that used to fall asleep when I was on him, which seemed to be the only time he really relaxed as he was a very stressy horse on his own time. He did, in the end, get diagnosed with a systemic herpes infection though (!!) so I don't know if that contributed.

I've known a couple of horses with seizure disorders but not one I know for sure has been diagnosed with narcolepsy so can't comment on how a case might present.
 
Yeah mine definately lays down. I did a sleep study years ago and she would lay down every night and get just enough sleep the vets considered her relatively normal. REM was hard to tell because the camera i had wasn't that sophisticated in the dark but she was certainly laying flat out for short periods. I have witnessed her in what i think was REM sleep sitting up int he field (she looked like a dogs - legs running etc) but she woke herself up when she flopped over sideways. I have considered that she could be uncomfortable when she's actually laying flat out so gets less REM sleep than normal.

I was worried recently that she could go 3 days without a spot of mud on her (living out) so i have brought her in and i think from her bed she is laying down every other night on average. She's 21 but rolls beautifully side to side and has no real problems getting up. I work where she's stabled so i watch her a lot. She also still moves nicely ridden and i get her checked with a physio regularly. I did a bute trial and it didn't make a difference to her. I know she's been doing her espisodes for many years and also i've never seen her go right down, no unexplained injuries etc so me and the vet have now said there's nothing more that can be done for her. She is a herd leader mare though and i do often wonder if she chooses to protect her herd (currently one gelding) rather than sleep properly.
 
It does sound like she has a good situation. There have been studies that suggested some horses don't sleep properly if they don't have a horse to watch over them (even stabled horses take turns sleeping, apparently) but if she's in when the others are in that seems unlikely.

I'm sure there are horses that have proper seizures, I just haven't seen ones like that. The two I did know, one used to just stagger a bit and then come to, then started to stagger and collapse. She never had one under saddle but had a spectacular one in the cross ties on day and nearly flattened someone so that was that. The other used to sort of vibrate and blank out - I guess the horse equivalent of a petit mal - but it was just as likely to happen when he was excited as quiet. I saw him have one trotting across a field once! They did try medication for him but it was a struggle getting him to eat it and it did make him very dopey. I rode him for my boss for awhile - lovely horse, very talented jumper - until his vet took me aside one day and said he had severe reservations.
 
GinaGem, I'd be very interested to see them!

He is on bute as and when he needs it, which luckily isn't often. He has known stifle problems which though he isn't a spring chicken anymore, he's still pretty nimble and has had no issues in the stables so far other than this one episode - he can get up and down quicker than my 7 year old.

I am currently debating if it is SD due to the fact he can be a very stressed horse at times - the week around the 5th of Nov often has him stressed out but his reaction that night was very very different - He does roll and lay down in the stable, though has previously been cast in stables which has put him off being down for long periods of time.

The testing for Narcolepsy is not something I'm prepared to do with him - so far there has been no other problems, I stayed with them until half 10 tonight due to the fireworks which caused him a lot of upset so I will be checking tomorrow to see if he appears tired as I doubt he will get much sleep tonight.
 
This is probably the most recent i've filmed:
http://www.youtube.com/watch?v=Ll-TO8sPe5M

This is what i see most commonly:
http://www.youtube.com/watch?v=HucdcCOQxFc
http://www.youtube.com/watch?v=hWcdrMqn6Ow

This one is interesting as she'd had a small episode standing and actually laid straight down:
http://www.youtube.com/watch?v=sWddLfWd-vA

And this is after she's laid down which i think is REM sleep (at about the mintue mark) but wakes herself up quite quickly:
http://www.youtube.com/watch?v=E-8LbMPUo8g
 
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