Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA.
Equine Vet J. 2010 Jan;42(1):23-9. doi: 10.2746/042516409X464113.
Caudal descent of the larynx has been proposed to be associated with intermittent dorsal displacement of the soft palate (DDSP) as it leads to a loss of the seal between the epiglottis and soft palate but further investigation of this theory is required.
To evaluate laryngohyoid position of horses with persistent DDSP in comparison to horses with intermittent DDSP and evaluate the outcome of treatment.
Horses with persistent DDSP have a different laryngohyoid position compared to those with intermittent DDSP. Horses with persistent DDSP can be returned successfully to racing with a laryngeal tie-forward procedure.
Medical records of 15 racehorses presented for persistent DDSP between 2002 and 2007 were reviewed. Age, sex and breed matched horses diagnosed with intermittent DDSP were used as a comparison group. Treatment of all horses was performed by laryngeal tie-forward, 8/15 horses with persistent DDSP had a subsequent laser staphylectomy. Preoperative laryngohyoid position was compared between the 2 groups using a radiographic reference system. Surgical effect on position was assessed by comparing pre- and post operative radiographic measurements. Outcome was assessed by return to racing and comparison of pre- and post operative race earnings ($).
Thirteen of 15 horses with persistent DDSP returned to racing. Seven of 15 horses were treated with laryngeal tie-forward alone while 8/15 horses were also treated with a laser staphylectomy. Horses with persistent DDSP had a more caudal larynx (ossification of the thyroid cartilage) (13 mm, P = 0.014), a more caudal (10 mm, P = 0.044) and dorsal (7 mm, P = 0.01) basihyoid bone, and a more dorsal thyrohyoid-thyroid articulation (10 mm, P = 0.002) than horses with intermittent DDSP.
Racehorses with persistent DDSP can be treated successfully by laryngeal tie-forward or by laryngeal tie-forward followed by laser staphylectomy. Horses with persistent DDSP have a more caudal larynx and more caudal and dorsal basihyoid bone than horses with intermittent DDSP.
喉下降被认为与软腭的间歇性后向移位（DDSP）有关，因为它导致会厌和软腭之间的密封丢失，但需要进一步研究该理论。
评估持续性 DDSP 马的喉舌骨位置与间歇性 DDSP 马的喉舌骨位置，并评估治疗效果。
持续性 DDSP 马的喉舌骨位置与间歇性 DDSP 马不同。通过喉舌骨前置术可成功治疗持续性 DDSP 马并使其重返比赛。
回顾了 2002 年至 2007 年期间因持续性 DDSP 就诊的 15 匹赛马的病历。选择年龄、性别和品种匹配的间歇性 DDSP 马作为对照组。所有马均采用喉舌骨前置术治疗，15 匹马中有 8 匹马随后进行了激光悬雍垂切除术。使用放射学参考系统比较两组术前喉舌骨位置。通过比较术前和术后的放射学测量值来评估手术对位置的影响。通过重返比赛和比较术前和术后的比赛收入（$）来评估结果。
15 匹持续性 DDSP 马中有 13 匹重返比赛。15 匹马中有 7 匹马仅接受了喉舌骨前置术治疗，8 匹马还接受了激光悬雍垂切除术治疗。持续性 DDSP 马的喉骨（甲状腺软骨）更靠后（13mm，P=0.014），舌骨更靠后（10mm，P=0.044）和更靠上（7mm，P=0.01），舌骨和甲状软骨的连接更靠后（10mm，P=0.002），与间歇性 DDSP 马相比。
持续性 DDSP 马可通过喉舌骨前置术或喉舌骨前置术联合激光悬雍垂切除术成功治疗。与间歇性 DDSP 马相比，持续性 DDSP 马的喉骨更靠后，舌骨更靠后和更靠上。
