Summaryo1.Exercise-induced pulmonary hemorrhage (EIPH) has occurred when evidence of hemorrhage into an airway is found post-exercise and no other cause can be found. It is likely that all horses have evidence of EIPH after intense exercise.2.EIPH in the horse is a normal response of horses to strenuous exercise. The blood originates primarily from the pulmonary circulation.3.In general, EIPH has little effect on racing performance unless the bleeding is severe. Horses that bleed and suffer a substantial reduction in performance may be suffering from other problems, both intrinsic or extrinsic.4.Many horses with a history of bleeding have lesions in the dorsal portion of the caudal lobes of the lung.
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