Effect of furosemide and furosemide-carbazochrome combination on exercise-induced pulmonary hemorrhage in Standardbred racehorses.

Cecilia I Perez-Moreno, Laurent L Couëtil, Suzanne M Pratt, Hugo G Ochoa-Acuña, Rose E Raskin, Mark A Russell

Index: Can. Vet. J. 50(8) , 821-7, (2009)

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Abstract

The objective was to quantify the effect of furosemide and carbazochrome on exercise-induced pulmonary hemorrhage (EIPH) in Standardbred horses using red blood cell count and hemoglobin concentration in bronchoalveolar lavage (BAL) fluid. Six healthy Standardbred horses with prior evidence of EIPH performed a standardized treadmill test 4 h after administration of placebo, furosemide, or furosemide-carbazochrome combination. Red blood cell (RBC) counts and hemoglobin concentrations were determined on the BAL fluid. The RBC count in BAL ranges were (2903-26,025 cells/microL), (45-24,060 cells/microL), and (905-3045 cells/microL) for placebo, furosemide, and furosemide-carbazochrome, respectively. Hemoglobin concentration ranges were (0.03-0.59 mg/mL), (0.01-0.55 mg/mL), and (0.007-0.16 mg/mL) for placebo, furosemide, and furosemide-carbazochrome groups, respectively. No significant differences were detected among treatments. However, there was great variability among horses, suggesting that a larger sample size or better selection of horses was needed.