Hart Samantha K, Southwood Louise L, Aceto Helen W
Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348.
J Am Vet Med Assoc. 2014 Jan 15;244(2):205-11. doi: 10.2460/javma.244.2.205.
To determine the effect of colic surgery on return to function in Thoroughbred racehorses, identify clinical variables associated with successful return to racing, and compare racing performance between horses undergoing colic surgery and an untreated cohort.
Retrospective cohort study.
59 Thoroughbred racehorses 2 to 5 years of age that underwent colic surgery and survived to hospital discharge and 90 untreated Thoroughbred racehorses equivalent in class.
Medical records of patients evaluated for colic between January 1996 and July 2009 were reviewed, and horses with a Jockey Club Information Systems record were included. Physical examination and laboratory findings on hospital admission, lesion location and type, duration of surgery, duration of hospitalization, and any postoperative complications were recorded. The untreated cohort comprised 2 untreated horses randomly selected from runners in each treated horse's last race immediately prior to the date of colic surgery. Records were obtained from the Jockey Club Information Systems in April 2011. Only horses that raced at least once before and after surgery were included in the performance analysis. Number of starts, earnings per start, and total earnings were determined from race records for all horses. Quarterly earnings and number of starts for 12 quarters following the date of surgery were compared between treated and untreated horses via a Wilcoxon rank sum test. Longevity of racing was assessed by means of survival analysis. Poisson regression was used to compare rates of return to racing and active quarters aggregated across the first 12 quarters after surgery and for the available follow-up period for treated and untreated horses.
45 of 59 (76%) horses that raced prior to surgery returned to racing. Return to racing was significantly associated with admission heart rate and blood lactate concentration. From quarters 3 to 12, treated and untreated horses had slight differences in the number of starts but no difference in earnings per quarter. Treated and untreated horses had no difference in total number of quarters raced, number of starts, or earnings after surgery. Treated horses had higher earnings per start, compared with untreated horses.
In the present study, racing Thoroughbreds that underwent colic surgery and successfully returned to racing had no differences in performance variables, compared with their untreated cohorts.
确定绞痛手术对纯种赛马恢复功能的影响，识别与成功恢复比赛相关的临床变量，并比较接受绞痛手术的马匹与未治疗队列马匹的比赛表现。
回顾性队列研究。
59匹2至5岁接受绞痛手术且存活至出院的纯种赛马以及90匹同等水平的未治疗纯种赛马。
回顾1996年1月至2009年7月间因绞痛接受评估的患者的病历，纳入有赛马俱乐部信息系统记录的马匹。记录入院时的体格检查和实验室检查结果、病变位置和类型、手术持续时间、住院时间以及任何术后并发症。未治疗队列包括在绞痛手术日期前，从每匹治疗马匹最后一场比赛的参赛马匹中随机选取的2匹未治疗马匹。记录于2011年4月从赛马俱乐部信息系统获取。仅将手术前后至少比赛一次的马匹纳入表现分析。根据所有马匹的比赛记录确定参赛次数、每次参赛收入和总收入。通过Wilcoxon秩和检验比较治疗组和未治疗组马匹在手术后12个季度的季度收入和参赛次数。通过生存分析评估比赛寿命。使用泊松回归比较治疗组和未治疗组马匹在手术后前12个季度以及可用随访期内恢复比赛的比率和活跃季度数。
59匹术前参赛的马匹中有45匹（76%）恢复比赛。恢复比赛与入院心率和血乳酸浓度显著相关。从第3季度到第12季度，治疗组和未治疗组马匹的参赛次数略有差异，但季度收入无差异。治疗组和未治疗组马匹术后比赛的总季度数、参赛次数或收入无差异。与未治疗组马匹相比，治疗组马匹每次参赛的收入更高。
在本研究中，接受绞痛手术并成功恢复比赛的纯种赛马与未治疗队列相比，在表现变量方面无差异。
