## Overview Synchronous diaphragmatic flutter, or thumps, is involuntary rhythmic contraction of the diaphragm synchronized with the heartbeat. It is often associated with low blood calcium or other electrolyte imbalances, classically in endurance horses after prolonged exercise and heavy sweating. Visible flank twitching matches the heart rate. It can accompany electrolyte disturbances or other illness and needs veterinary assessment; treatment depends on the cause. ## Causes Hypocalcemia and electrolyte losses from sweating, or other causes of low calcium. ## Diagnosis Observation of flank twitching synchronous with the heartbeat, plus blood electrolyte measurement. ## Treatment Intravenous calcium and fluids when indicated by the veterinarian. Rest. Response depends on the underlying cause. ## Recovery and Prognosis Often good with prompt treatment, but outcome depends on any underlying disease. ## Prevention Electrolyte supplementation during prolonged exercise and attention to calcium balance.
visible rhythmic flank twitching synchronized with the heartbeat; occurs during or after prolonged exercise; indicates electrolyte depletion
## Overview Synchronous diaphragmatic flutter, or thumps, is involuntary rhythmic contraction of the diaphragm synchronized with the heartbeat. It is often associated with low blood calcium or other electrolyte imbalances, classically in endurance horses after prolonged exercise and heavy sweating. Visible flank twitching matches the heart rate. It can accompany electrolyte disturbances or other illness and needs veterinary assessment; treatment depends on the cause. ## Causes Hypocalcemia and electrolyte losses from sweating, or other causes of low calcium. ## Diagnosis Observation of flank twitching synchronous with the heartbeat, plus blood electrolyte measurement. ## Treatment Intravenous calcium and fluids when indicated by the veterinarian. Rest. Response depends on the underlying cause. ## Recovery and Prognosis Often good with prompt treatment, but outcome depends on any underlying disease. ## Prevention Electrolyte supplementation during prolonged exercise and attention to calcium balance.
visible rhythmic flank twitching synchronized with the heartbeat; occurs during or after prolonged exercise; indicates electrolyte depletion