Safe and Efficacious Dosage of Flecainide Acetate for Treating Equine Atrial Fibrillation.
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概要
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To determine a safe and efficacious dose of flecainide acetate for treating equine atrial fibrillation (Af), the safe dosage level was determined by injecting 1, 2, or 3 mg/kg i.v. of 1% flecainide acetate solution at a rate of 0.2 mg/kg/min to five clinically healthy horses. Clinical signs and the ECG were monitored (HR, PR, QRS, and QT intervals) and blood was taken to measure the plasma flecainide concentration pre- and post-administration. No abnormal signs were observed in the 1- or 2-mg/kg groups, while agitation was observed in three of five horses in the 3-mg/kg group. The QRS, and QT intervals for the 3-mg/kg group increased significantly. The peak plasma flecainide concentrations were 1,316 ± 358 (SD) ng/ml, 1,904 ± 314 ng/ml, and 2,251 ± 387 ng/ml for the 1-, 2-, and 3-mg/kg groups, respectively. To evaluate the efficacy of flecainide, Af was induced by right atrial pacing in six clinically healthy horses, and 1 0.000000lecainide acetate solution was then administered until they converted to sinus rhythm. All horses with induced Af converted. For the conversion, a total dose of 1.40 ± 0.63 mg/kg flecainide was required, the duration of administration was 7.00 ± 3.15 min and plasma flecainide concentration at conversion was 1,303 ± 566 ng/ml. In conclusion, flecainide acetate is a safe and effective antiarrhythmic agent for equine Af, and the clinically effective dosage is 1 to 2 mg/kg.
- 公益社団法人 日本獣医学会の論文
著者
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OHMURA Hajime
Racehorse Clinic, Miho Training Center, Japan Racing Association
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Amada Akio
Blood Horse Training Center
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Mizuno Yutaka
Racehorse Clinic Japan Racing Association Miho Training Center
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Nakayama Toshio
Department Of Cardiology Jichi Medical School
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Nakayama Toshio
Department of Cardiology, Jichi Medical School
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YAMAYA Yoshiki
Laboratory of Comprehensive Veterinary Clinical Studies, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University
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YAMAYA Yoshiki
Laboratory of Veterinary Surgery, College of Bioresourse Sciences, Nihon University
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NUKADA Toshio
Racehorse Clinic, Japan Racing Association Miho Training Center
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OHMURA Hajime
Racehorse Clinic, Japan Racing Association Miho Training Center
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