If a racehorse is not performing well or showing signs of acute exercise intolerance, it suggests that the animal is suffering from atrial fibrillation, or abnormal heart rhythm, said veterinarian Kelsey A. Hart. "If the horse needs to go back to doing its job, and it is not performing at the desired level, then a veterinarian may attempt to convert that horse back to a sinus rhythm either pharmacologically or electrically," Hart said at AVMA's meeting in Atlanta.

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