ICA prevents electrically induced runs of atrial fibrillation in the isolated right atrium and induces atrial postrepolarization refractoriness and depolarizes resting membrane potential. SK channel inhibition by ICA (10-30 μM) demonstrates prominent depression of other sodium channel-dependent parameters, at increased pacing frequencies. The SK channel inhibitor ICA shows antiarrhythmic effects. ICA at 1 to 10 μM displays conduction velocity[2].