Parker County Today November 2017 - Page 79

the entire upper airway is examined. Examination should not stop at confirmation of the suspected lesion because some horses have more than one problem. The examiner should ascertain whether the lesion in question is compatible with the history and the signs that the horse is exhibiting. Some conditions are not apparent at rest. Exercising the horse under tack or harness under the conditions in which the owner or trainer reports the problem is helpful. Endoscopic examination is then performed at the conclusion of exercise. Racehorses may be examined on the track during training by waiting near the finish line to hear any noise generated and to perform an endoscopic exam at the termination of work. The following list is not all inclusive; rather, it covers the most common upper respiratory causes of exercise intolerance in performance horses in descending order of frequency. Differences in clinical presentation and response to therapy in horses engaging in different activities can create some overlap in diagnostic perception. • Laryngeal Hemiplegia • Dorsal Displacement of the Soft Palate • Epiglottic Entrapment • Epiglottic Hypoplasia • • • • • • Arytenoid Chondritis Ethmoid Hematomas Pharyngeal Cysts Hyperkalemic Periodic Paralysis Maxillary Sinus Cysts Guttural Pouch Empyema Retropharyngeal Abscesses • Alar Fold Obstruction • Nasal Collapse and The respiratory system is a frequent cause of exercise intolerance in performance horses. Labored breathing, fatigue during performance and prolonged recovery after exercise are common complaints. Inadequate fitness level and diseases of the cardiovascular system are differential diagnoses that share these complaints and should be investigated. Generation of increased airway noise is a clinical sign that implicates the upper respiratory system. A careful history from the owner, trainer, and endoscopy of the upper airway are the most useful tools. Endoscopy during exercise on a treadmill is indicated when the airway lesion is not apparent with endoscopy at rest. Treatment of the respiratory obstruction may differ with the level of performance required. Dr. Craig Sweatt • Dr. Tom Hutchins • Dr. Stacy McLeod 8283 FM 920 • Weatherford, Texas • 817-458-3355 Small Animal •Equine •Livestock •Ambulatory Services 77