Abstract:arrhythmogenic early afterdepolarizations (EADs) characteristic of LQT2 myocytes under b-adrenergic stimulation. Parameters of Ca handling were measured in ventricular myocytes isolated from normal and LQT2 hearts using confocal Ca imaging and whole-cell patch clamp. Ca imaging revealed no LQT2-mediated changes in amplitude of Ca transients and SR Ca content under basal conditions. Experiments in saponin-permeabilized cells using SRentrapped low-affinity Ca indicator revealed enhanced RyR-mediated SR Ca leak a… Show more
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