Equine veterinary journal · 2010
Incidence of swallowing during exercise in horses with dorsal displacement of the soft palate.
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Pigott J H, Ducharme N G, Mitchell L M, Soderholm L V, Cheetham J
Аннотация
REASONS FOR PERFORMING STUDY: The relationship between dorsal displacement of the soft palate (DDSP) and swallowing is unclear.
OBJECTIVE: To quantify the relationship between DDSP and swallowing in horses at exercise.
HYPOTHESES: The frequency of swallowing increases immediately prior to DDSP in horses at exercise.
METHODS: Videoendoscopic and upper airway pressure data were collated from horses with a definitive diagnosis of DDSP at exercise. Horses with no upper airway abnormalities were matched by age, breed and sex and used as controls. Sixty-nine horses were identified with a definitive diagnosis of DDSP during the study interval. Airway pressure data were available for 42 horses.
RESULTS: The majority of horses displaced at high exercising speeds while accelerating; a smaller number displaced during deceleration after peak speed had been reached. Horses swallowed significantly more frequently in the 1 min immediately preceding DDSP than in the control horses at equivalent speeds. DDSP at exercise results in a significant increase in tracheal expiratory pressure, a significant decrease in pharyngeal expiratory pressure and a significantly less negative pharyngeal inspiratory pressure compared to matched controls and compared to the pressures during the 1 min interval prior to DDSP. There was no significant difference between any measure of airway pressure before or after a swallow when examined at each time interval in the DDSP population.
CONCLUSIONS: The frequency of swallowing decreases with increasing speed in normal horses. In contrast, the frequency of swallowing increases immediately prior to onset of DDSP. This is not a result of pharyngeal and tracheal pressure changes.
POTENTIAL RELEVANCE: The increased frequency of swallowing observed prior to DDSP may be related to the aetiology of the disease.
OBJECTIVE: To quantify the relationship between DDSP and swallowing in horses at exercise.
HYPOTHESES: The frequency of swallowing increases immediately prior to DDSP in horses at exercise.
METHODS: Videoendoscopic and upper airway pressure data were collated from horses with a definitive diagnosis of DDSP at exercise. Horses with no upper airway abnormalities were matched by age, breed and sex and used as controls. Sixty-nine horses were identified with a definitive diagnosis of DDSP during the study interval. Airway pressure data were available for 42 horses.
RESULTS: The majority of horses displaced at high exercising speeds while accelerating; a smaller number displaced during deceleration after peak speed had been reached. Horses swallowed significantly more frequently in the 1 min immediately preceding DDSP than in the control horses at equivalent speeds. DDSP at exercise results in a significant increase in tracheal expiratory pressure, a significant decrease in pharyngeal expiratory pressure and a significantly less negative pharyngeal inspiratory pressure compared to matched controls and compared to the pressures during the 1 min interval prior to DDSP. There was no significant difference between any measure of airway pressure before or after a swallow when examined at each time interval in the DDSP population.
CONCLUSIONS: The frequency of swallowing decreases with increasing speed in normal horses. In contrast, the frequency of swallowing increases immediately prior to onset of DDSP. This is not a result of pharyngeal and tracheal pressure changes.
POTENTIAL RELEVANCE: The increased frequency of swallowing observed prior to DDSP may be related to the aetiology of the disease.