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• W1992634291 abstract "Electrophysiological effects of sematilide, a novel class III antiarrhythmic agent, were examined and compared with those of (±)sotalol in guinea pig left atrium by a conventional microelectrode technique. Application of 0.1-1000 μM sematilide or 1-1000 μM (±)sotalol concentration-dependently prolonged the duration of action potentials (APD) that were elicited by electrical stimulation at 1 Hz. Other parameters of action potentials such as the maximum upstroke velocity of phase 0 depolarization, action potential amplitude and resting membrane potential were not affected significantly by these drugs in the concentration ranges employed. The prolongation of APD by sematilide or (±)sotalol was accompanied by a corresponding increase in the effective refractory period (ERP). Approximately a 30% increase in ERP was obtained by the treatment with 5 μM sematilide or 100 μM (±)sotalol, suggesting that sematilide as a class III antiarrhythmic agent is approximately 20 times more potent than (±)sotalol on a molecular basis. When the stimulation rate was increased stepwise from 0.2 to 2 Hz, the relative increase in APD at 90% repolarization by the treatment with sematilide and (±)sotalol was slightly larger at 2 Hz than at 0.2 Hz, indicating that “reverse rate-dependence” was not observed under these conditions. These results may suggest a possibility that sematilide effectively blocks atrial arrhythmia." @default.
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• W1992634291 date "1995-01-01" @default.
• W1992634291 modified "2023-10-18" @default.
• W1992634291 title "Effects of Sematilide, a Novel Class III Antiarrhythmic Agent, on Action Potential in Guinea Pig Atrium" @default.
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• W1992634291 doi "https://doi.org/10.1254/jjp.68.175" @default.
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