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Inhibition of cardiac K channels by local anesthetic may contribute to QTc interval prolongation of the electrocardiogram and induction of ventricular arrhythmia. The transient outward current Ito has been identified as a toxicologically relevant target of bupivacaine. S(-)-ropivacaine has been developed as a safer alternative to bupivacaine. The effects of S(-)-ropivacaine on Ito have not been investigated. In human ventricular myocardium, Ito is formed by Kv4.3 and KChIP2.2 subunits. Therefore, the aim of this study was to establish the effects of S(-)-ropivacaine on human Kv4.3/KChIP2.2 channels.

Interaction of Ropivacaine with Cloned Cardiac Kv4.3/KChIP2.2 Complexes