Synchronous Diaphragmatic Flutter in a Lactating Mare

The mare presented subdued, lethargic and with a lowered head. There was little clinical evidence of sweating and the mare was assessed as not being markedly dehydrated. The mare walked into the hospital and was steady on its feet, but exhibited breathing difficulties. On physical examination, the mare was observed to have very rapid abdominal respiration and on auscultation of the chest, was found to have synchronous heart and respiratory rates of nearly 60 per minute, causing the mare considerable respiratory distress and an exaggerated respiratory sound.