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Roarers and Laryngeal Hemiplegia in Horses and Equines
by Robert N. Oglesby DVM
Introduction
Introduction
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Clinical Signs
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The Cause
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Diagnosis
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Treatment and Prognosis
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More Info
A frequent problem with horses is respiratory noise during exercise. The possible causes for this noise are: dorsal displacement of the soft palate, collapse of the pharyngeal walls, and laryngeal hemiparesis. For more information on other causes of noise and exercise intolerance see:
Respiratory Noise.
The larynx is a cartilaginous box located at the back of the throat that leads to the trachea (windpipe). It is responsible for keeping food out of the trachea and vocalization. With laryngeal hemiparesis (LH) one of the two flaps responsible for closing the trachea when food is swallowed, becomes weak or even paralyzed and stuck in the closed position. At rest there is plenty of room for air to get through. As the horse's exercise level goes up he reaches a point where the flap impedes breathing. This is the cause of the noise and if severe, exercise intolerance. The degree of paralysis is variable and some horses have noise without exercise intolerance.
This article concerns itself with the cause, diagnosis, treatment options, and prognosis of this condition.
~Word Count: 2835 words (The average magazine page contains about 600 words);
~Last Updated: May 28, 2008;
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Discussions on Laryngeal Hemiplegia
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Subtopics |
Posts |
Updated |
 | Research Summary: Sedation influences laryngeal function | 1 | 1 | Feb 18, 08 |
| Research Summary: Endoscopic laser ventriculocordectomy for larynge... | 1 | 1 | Jan 31, 08 |
| Cornell collar | 1 | 2 | Jan 15, 08 |
| Roaring and Coughing are they related? | 1 | 3 | Mar 29, 07 |
| Prevalence of laryngeal disease in draft horses | 1 | 2 | Sep 17, 06 |
| Diagnosis left laryngeal hemiplagia | 1 | 9 | Mar 9, 05 |
| Right sided roarer | 1 | 2 | Mar 18, 04 |
| Bleeding/Tie Back Surgery connected? | 1 | 2 | Jun 4, 02 |
| Long-term success of tie-back surgery | 1 | 3 | Jun 3, 02 |
| Conditions effecting tie-back surgery | 1 | 2 | Jul 29, 01 |
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