Effect of Terfenadine and KW-4679, a Novel Antiallergic Compound, on Action Potential of Guinea Pig Ventricular Myocytes.

  • Ohmori Kenji
    Pharmaceutical Research Laboratories, Kyowa Hakko Kogyo Co., Ltd.
  • Ichimura Michio
    Pharmaceutical Research Laboratories, Kyowa Hakko Kogyo Co., Ltd.

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It has been reported that terfenadine caused torsade de pointes ventricular arrhythmias. The prolongation of action potential duration (APD) in ventricles is considered to be one of the mechanisms of this adverse effect. We examined the effect of antiallergic drugs, terfenadine and KW-4679 ((Z)-11[3-(dimethylamino)propylidene]-6, 11-dihydrodibenz[b, e]oxepin-2-acetic acid hydrochloride), on action potentials in isolated guinea pig ventricular myocytes. Terfenadine (30 nM-1 μM) increased APD in a concentration-dependent manner. On the other hand, KW-4679 (0.1 μM-100 μM) exerted no significant effects on action potential parameters. These results present no evidence that KW-4679 has the possibility to cause ventricular arrhythmias.

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  • Jpn.J.Pharmacol.

    Jpn.J.Pharmacol. 70 (2), 199-202, 1996

    公益社団法人 日本薬理学会

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