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Sustained narrow-QRS tachycardia of three months duration and left ventricular systolic dysfunction were identified in a fifteen-year-old Quarter Horse. No underlying cause for the tachyarrhythmia was found and no predisposing structural cardiac lesions were evident by echocardiography. Intravenous diltiazem and lidocaine were administered without achieving successful conversion of the arrhythmia. Oral quinidine therapy converted the tachyarrhythmia to sinus rhythm. Ventricular systolic dysfunction and chamber dilatation subsequently resolved. As with other species, echocardiographic features of dilated cardiomyopathy can be tachycardia-induced and may resolve following successful control of heart rate and rhythm. Published by Elsevier B.V.


Joshua A Stern, Yamir R Doreste, Susan Barnett, Sunshine M Lahmers, Ryan D Baumwart, Kathy K Seino, John D Bonagura. Resolution of sustained narrow complex ventricular tachycardia and tachycardia-induced cardiomyopathy in a Quarter Horse following quinidine therapy. Journal of veterinary cardiology : the official journal of the European Society of Veterinary Cardiology. 2012 Sep;14(3):445-51

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PMID: 22841902

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