Idiopathic atrial fibrillation in a champion Standardbred racehorse [case study; heart disorder]
1990
Stewart, G.A. (Melbourne Univ., Parkville (Australia). School of Veterinary Science) | Fulton, L.J. | McKellar, C.D. (Ballarat Veterinary Practice, Ballarat (Australia))
Prior to conversion atrial fibrillation had been present for at least 6 weeks, during which the horse had not raced. Successful treatment was achieved with two 10g doses of quinidine sulphate per oesophageal tube, after slow digitalisation with intravenous digoxin over 4d. Four hours after commencement of quinidine therapy the arrhythmia had regressed to atrial flutter and converted to sinus rhythm 10 min later. The absence of abnormalities of atrial and atrio-ventricular conduction after the cessation of the arrhythmia, together with the horse's return to successful racing, indicate that this was a case of atrial fibrillation occuring as a functional disorder without persistent atrial pathology.
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