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Can an external device prevent dorsal displacement of the soft palate during strenuous exercise?
Equine Vet J. 2005 Sep; 37(5):425-9.EV

Abstract

REASONS FOR PERFORMING STUDY

Dorsal displacement of the soft palate (DDSP) is a common condition in racehorses for which various surgical treatments are often performed. In light of recent findings that suggested the position of the larynx may influence the occurrence of DDSP, we investigated whether a noninvasive mean of affecting the position of the larynx could be effective in the management of DDSP.

HYPOTHESIS

An external device (laryngohyoid support; LHS) positioning the larynx in a more rostral and dorsal location and preventing caudal displacement of the basihyoid bone would be effective in preventing DDSP during strenuous exercise.

METHODS

Ten horses were exercised on a high-speed treadmill under 4 different treatment conditions: control (n = 10); control with external device (n = 10); after bilateral resection of thyrohyoid (TH) muscles (n = 7); and after bilateral resection of TH muscles with external device (n = 7). Two trials were performed randomly for each of the 4 conditions. In Trial 1, videoendoscopic images of the upper airway, pharyngeal and tracheal static pressures, and arterial blood gases were collected. In Trial 2, airflow measurement combined with mask and tracheal static pressure was obtained, and upper airway impedance calculated. The trials allowed calculation of airway impedance and respiratory frequency, and assessment of ventilation using arterial PO2 and PCO2.

RESULTS

Under control conditions, none of the 10 horses developed DDSP. There was no statistically significant effect from the LHS on airway impedance or respiratory frequency, nor on arterial PO2 and PCO2. Seven of the 10 horses developed DDSP during exercise after resection of the TH muscles. None of these 7 horses continued to experience DDSP during exercise with the external device. In the latter group and condition, the LHS significantly improved inspiratory and expiratory flow and impedance.

CONCLUSIONS

The LHS helped prevent experimentally induced DDSP at exercise, probably by statically positioning the larynx in a more rostral and dorsal position.

POTENTIAL RELEVANCE

Field studies are required to investigate whether the LHS can successfully prevent DDSP in horses with naturally occurring disease.

Authors+Show Affiliations

Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16163944

Citation

Woodie, J B., et al. "Can an External Device Prevent Dorsal Displacement of the Soft Palate During Strenuous Exercise?" Equine Veterinary Journal, vol. 37, no. 5, 2005, pp. 425-9.
Woodie JB, Ducharme NG, Hackett RP, et al. Can an external device prevent dorsal displacement of the soft palate during strenuous exercise? Equine Vet J. 2005;37(5):425-9.
Woodie, J. B., Ducharme, N. G., Hackett, R. P., Erb, H. N., Mitchell, L. M., & Soderholm, L. V. (2005). Can an external device prevent dorsal displacement of the soft palate during strenuous exercise? Equine Veterinary Journal, 37(5), 425-9.
Woodie JB, et al. Can an External Device Prevent Dorsal Displacement of the Soft Palate During Strenuous Exercise. Equine Vet J. 2005;37(5):425-9. PubMed PMID: 16163944.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Can an external device prevent dorsal displacement of the soft palate during strenuous exercise? AU - Woodie,J B, AU - Ducharme,N G, AU - Hackett,R P, AU - Erb,H N, AU - Mitchell,L M, AU - Soderholm,L V, PY - 2005/9/17/pubmed PY - 2005/12/24/medline PY - 2005/9/17/entrez SP - 425 EP - 9 JF - Equine veterinary journal JO - Equine Vet J VL - 37 IS - 5 N2 - REASONS FOR PERFORMING STUDY: Dorsal displacement of the soft palate (DDSP) is a common condition in racehorses for which various surgical treatments are often performed. In light of recent findings that suggested the position of the larynx may influence the occurrence of DDSP, we investigated whether a noninvasive mean of affecting the position of the larynx could be effective in the management of DDSP. HYPOTHESIS: An external device (laryngohyoid support; LHS) positioning the larynx in a more rostral and dorsal location and preventing caudal displacement of the basihyoid bone would be effective in preventing DDSP during strenuous exercise. METHODS: Ten horses were exercised on a high-speed treadmill under 4 different treatment conditions: control (n = 10); control with external device (n = 10); after bilateral resection of thyrohyoid (TH) muscles (n = 7); and after bilateral resection of TH muscles with external device (n = 7). Two trials were performed randomly for each of the 4 conditions. In Trial 1, videoendoscopic images of the upper airway, pharyngeal and tracheal static pressures, and arterial blood gases were collected. In Trial 2, airflow measurement combined with mask and tracheal static pressure was obtained, and upper airway impedance calculated. The trials allowed calculation of airway impedance and respiratory frequency, and assessment of ventilation using arterial PO2 and PCO2. RESULTS: Under control conditions, none of the 10 horses developed DDSP. There was no statistically significant effect from the LHS on airway impedance or respiratory frequency, nor on arterial PO2 and PCO2. Seven of the 10 horses developed DDSP during exercise after resection of the TH muscles. None of these 7 horses continued to experience DDSP during exercise with the external device. In the latter group and condition, the LHS significantly improved inspiratory and expiratory flow and impedance. CONCLUSIONS: The LHS helped prevent experimentally induced DDSP at exercise, probably by statically positioning the larynx in a more rostral and dorsal position. POTENTIAL RELEVANCE: Field studies are required to investigate whether the LHS can successfully prevent DDSP in horses with naturally occurring disease. SN - 0425-1644 UR - https://www.unboundmedicine.com/medline/citation/16163944/Can_an_external_device_prevent_dorsal_displacement_of_the_soft_palate_during_strenuous_exercise L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0425-1644&date=2005&volume=37&issue=5&spage=425 DB - PRIME DP - Unbound Medicine ER -