Barakzai Safia Z, Boden Lisa A, Dixon Padraic M
Division of Veterinary Clinical Science, Royal (Dick) School of Veterinary Studies, Easter Bush Veterinary Centre, University of Edinburgh, Easter Bush, Roslin, UK.
Vet Surg. 2009 Dec;38(8):934-40. doi: 10.1111/j.1532-950X.2009.00605.x.
To (1) assess the degree of arytenoid cartilage abduction lost after laryngoplasty (LP) in Thoroughbred National Hunt racehorses and (2) to correlate postoperative racing performance with degree of arytenoid abduction after LP.
Case series.
National Hunt Thoroughbred racehorses (n=68).
Grade of postoperative arytenoid abduction for National Hunt racehorses that had LP with ventriculocordectomy was assessed at 1 day, 6 days, and 6 weeks after LP. Race records were analyzed to ascertain if there was correlation between the degree of arytenoid cartilage abduction and various measures of race performance (return to racing postoperatively, total earnings in 5 races immediately postoperatively, and lifetime number of starts postoperatively).
Median postoperative arytenoid abduction was grade 2 on day 1 but had decreased to grade 3 by 6 weeks. Horses with grades 1, 2, and 3 abduction 1 day after surgery had median losses of 1, 1, and 0.5 abduction grades, respectively, at 6 weeks. Horses with grade 1 abduction on day 1 were significantly more likely to lose abduction by day 6 after surgery than horses with grade 3 abduction on day 1. There was no statistically significant correlation between the postoperative grade of arytenoid abduction at any time point and earnings in 5 races after surgery, likelihood of racing postoperatively, or total number of lifetime race starts postoperatively.
Horses with maximal (grade 1) surgical arytenoid abduction are significantly more likely to suffer postoperative loss of abduction than those with grade 3 abduction. Postoperative grade of abduction does not appear significantly correlated with markers of racing performance in National Hunt racehorses; however, very few horses with poor (grade 4 or 5) abduction were included and thus conclusions regarding racing performance in such horses cannot be drawn from this study.
Seemingly, most horses with grade 3 laryngeal abduction can race successfully and perhaps surgeons should not be disillusioned by the appearance of only moderate (grade 3) abduction in the long term after LP in racehorses.
（1）评估纯种国家狩猎赛马行喉成形术（LP）后杓状软骨外展丧失的程度，（2）将术后比赛成绩与LP后杓状软骨外展程度相关联。
病例系列。
国家狩猎纯种赛马（n = 68）。
对行LP联合心室声带切除术的国家狩猎赛马，在LP后1天、6天和6周评估术后杓状软骨外展分级。分析比赛记录，以确定杓状软骨外展程度与各种比赛成绩指标（术后恢复比赛情况、术后立即进行的5场比赛的总收入以及术后终身参赛次数）之间是否存在相关性。
术后第1天杓状软骨外展的中位数为2级，但到6周时已降至3级。术后1天杓状软骨外展为1级、2级和3级的马，在6周时杓状软骨外展分级的中位数分别下降了1级、1级和0.5级。术后1天杓状软骨外展为1级的马比术后1天杓状软骨外展为3级的马在术后第6天更有可能丧失外展功能。在任何时间点，术后杓状软骨外展分级与术后5场比赛的收入、术后参赛可能性或术后终身参赛总次数之间均无统计学上的显著相关性。
手术时杓状软骨外展最大（1级）的马比外展为3级的马术后更有可能出现外展功能丧失。在国家狩猎赛马中，术后外展分级似乎与比赛成绩指标无显著相关性；然而，纳入的杓状软骨外展较差（4级或5级）的马很少，因此无法从本研究得出此类马比赛成绩的结论。
显然，大多数杓状软骨外展为3级的马能够成功参赛，或许外科医生不应因赛马行LP后长期仅出现中度（3级）外展而感到失望。
