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Synchronous Diaphragmatic FlutterBy Kentucky Equine Research Staff · December 1, 2005
Synchronous diaphragmatic flutter (SDF), more commonly known as “thumps,” is a condition characterized by hiccup-like contractions of the horse's diaphragm. It is most commonly seen as a sign of dehydration and electrolyte depletion among horses performing in endurance races. SDF can also result from a horse ingesting cantharadin, a toxin found in blister beetles, insects that are sometimes harvested in alfalfa hay.
