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Laryngeal
Hemiplegia
*can be either left or
right (LLH or RLH), however the left arytenoid is
affected more commonly than the right (any grade)
*grading is performed both at rest and at speed
*You cannot make an accurate assessment without examining the horse’s
URT during high speed exercise
*The high speed exam is performed using a treadmill combined with
videoendoscopy.
Grading
of Laryngeal Function at Rest
*Grade I
– Normal abduction, symmetry and adduction of both arytenoids
*Grade II
– Asymmetric or asynchronous (slow) abduction of either arytenoid
*Grade
III – Asymmetric and asynchronous abduction of either arytenoid
*Grade IV
– Paralysis of one arytenoid.
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