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The slow component of the delayed rectifier K+ current (IKs) is believed to be important in cardiac repolarization, and may be a potential target for antiarrhythmic drugs, but its study has been limited by a lack of specific blockers. The chromanol derivate 293B blocks currents expressed by minK and not HERG in Xenopus oocytes, but little is known about its effects on native currents and action potentials. We aimed to establish the effects of 293B on K+, Na+ and Ca2+ currents and action potentials in human and guinea pig cardiomyocytes.

cardiovascular research

Effects of the chromanol 293B, a selective blocker of the slow, component of the delayed rectifier K+ current, on repolarization in human and guinea pig ventricular myocytes