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- W2040511157 abstract "Ibutilide, Sotalol, and Atrial Flutter. Introduction: Atrial arrhythmias are a frequent clinical complication following open heart surgery. We compared the Class III agents d,I-sotalol and ibutilide fumarate in an intravenous cross-over study using the canine atrial sterile pericarditis model. Methods and Results: We studied pacing-induced sustained atrial flutter over a 7-day post-surgical period in conscious dogs, alternating analysis of ibutilide (1.0 to 30.0 μg/kg) and d,I-sotalol (0.1 to 3.0 mg/kg). Ibutilide significantly increased atrial flutter cycle length (AFL CL) II ± 2 msec and atrial effective refractory period (AERP) 13 ± 2 msec, and terminated atrial flutter in all cases (n = 12) following a mean dose of 6 ± 2 μg/kg. Plasma concentrations of ibutilide were 53 ± 13 ng/mL. Ventricular effective refractory period (VERP) was not signiflcantly affected (4 ± 2 msec). Following termination with ibutilide, atrial flutter could he reinitiated in 1 of 12 trials, and was nonsustained (40-sec duration). Sotalol significantly increased AFL CL 23 ± 3 msec and terminated atrial flutter in 8 of 12 trials following a mean dose of 1.5 ± 0.4 mg/kg. AERP and VERP were significantly increased 20 ± 6 and 12 ± 2 msec, respectively. The incidence of reinduced atrial flutter was 9 of 12 trials (P ≥ 0.05 vs ibutilide) (7 nonsustained 57 ± 7 sec duration, and 2 sustained). Sotalol failed to terminate atrial flutter in two dogs on days 1 and 5, despite increases in AFL CL (21 ± 8 msec) and AERP (16 ± 9 msec), whereas on day 3, ibutilide (20 ± 7 μg/kg) terminated atrial flutter in those two dogs while increasing AFL CL and AERP 18 ± 6 and 15 ± 0 msec, respectively. Conclusion: Both sotalol and ibutilide terminate atrial flutter in this model. Ibutilide converted atrial flutter in dogs in which sotalol was not successful. Following atrial flutter termination, ibutilide had a lower incidence of reinduced arrhythmias compared to sotalol. Ibutilide produced atrial antiarrhythmic effects while having no significant electrophysiologic effects on the ventricle." @default.
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- W2040511157 date "1996-02-01" @default.
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- W2040511157 title "Antiarrhythmic and Electrophysiologic Effects of Intravenous Ibutilide and Sotaloi in the Canine Sterile Pericarditis Model" @default.
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- W2040511157 doi "https://doi.org/10.1111/j.1540-8167.1996.tb00506.x" @default.
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