ridecamp@endurance.net: Re: AV block

Re: AV block

C.M.Newell (reshan@deyr.ultranet.com)
Sat, 22 Feb 1997 12:00:37 -0500 (EST)

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>I'm not sure that this is related, but my horse (7 year old arab) has also
>been identified as having a second degree AV blockage. I discovered this
>after he won his first 60 mile ride; so I am hoping that it really isn't as
>serious as it sounds.

2nd degree AV block is not necessarily a pathologic condition in the
horse. It is often found in normal animals at rest, and in my experience,
more frequently in fit horses.
What it is, is a P wave not followed by a QRS complex, or
simplified, a lub without the dub.
In most horses with 2nd degree block, this is found in resting
horses with a normal HR, and is abolished with exercise.
--CMNewell, DVM

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