Michael G. Klein et al. JACEP 2016;2:

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Michael G. Klein et al. JACEP 2016;2:784-789 Loperamide Inhibition of hERG Potassium Ion Current (A) Human ether-à-go-go-related gene (hERG) ionic currents in control (0 nmol/l) and during exposure to loperamide (10, 100, and 1,000 nmol/l). All records are from the same cell exposed to increasing concentrations of loperamide. The lower (black) record shows the timing of the voltage pulse protocol. (B) Concentration dependence of loperamide blockade of hERG currents. Data points represent mean ± SEM for the number of cells indicated. Inhibition was determined as the percentage block of tail currents at −50 mV following an activating pulse to +10 mV. The solid line is a single-site binding curve with KD = 37.2 nmol/l. The dashed lines and arrowhead depict the loperamide concentration resulting in 50% block of hERG currents. Michael G. Klein et al. JACEP 2016;2:784-789 American College of Cardiology Foundation