Definitions for "Thumps"
See synchronous diaphragmatic flutter.
Cardio-synchronous diaphragmatic flutter, or SDF. Thumps occur when the heart's electrical signals leak back down the phrenic nerve and stimulate the vagus nerve. The aberrant signals then stimulate contractions of the diaphragm in sychrony with the heart rate. Thumps is generally related to severe electrolyte imbalance. A horse with thumps should be eliminated from further competition.