Digging Deeper into Breeders’ Cup Lasix Study

Study shows horses who previously had not raced on furosemide fared well in Breeders’ Cup juvenile races.
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A follow-up look at some of the racing statistics of juveniles involved in the furosemide observational study results released Dec. 16 by Breeders’ Cup from this year’s World Championships and two California-bred stakes races for 2-year-olds at Santa Anita Park provides some interesting additional information.

The observational study found that 2-year-olds racing without race-day furosemide (commonly called Lasix or Salix) at the 2013 Breeders’ Cup—the four World Championship races plus the Juvenile Turf Sprinthad fewer and less severe instances of exercise-induced pulmonary hemorrhage than juveniles who raced with the diuretic that same weekend at Santa Anita in a pair of stakes for California-breds.

In the voluntary study that saw connections of 70.5% of the horses participate, 71% of the horses who raced with Salix (10 of 14) were observed to have some level of EIPH while just 37% of the non-treated horses (15 of 41) showed some level of EIPH.

The severity of EIPH was determined on a four-grade (four being most severe) scale. The Salix-treated horses again showed significantly higher numbers of severe bleeding, as 36% (five of 14) showed grade three or grade four EIPH, compared with only 7% (three of 41) at those grade levels in the non-treated group

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Frank Angst is a staff writer for The Blood-Horse magazine. An American Horse Publications three-time winner in best news story category, Angst has covered horse racing for more than a decade. Angst spent ten years at Thoroughbred Times, where he earned awards as that magazine’s senior writer and helped launch Thoroughbred Times TODAY. Besides covering horse racing, Angst enjoys handicapping. Angst has written about sports for more than 20 years, including several seasons covering a nationally ranked Marshall Thundering Herd football team.

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