Slow inactivation steady state. Slow inactivation steady state curves are shown at pH 7.4 control (filled circles, n = 12), 10 μM ranolazine (filled squares, n = 9), and 100 μM ranolazine (filled diamonds, n = 5) in A. Slow inactivation steady state curves are shown at pH 6.0 control (open circles, n = 8), 10 μM ranolazine (open squares, n = 7) and 100 μM ranolazine (open diamonds, n = 7) in B. Boltzmann curve parameters are in Table 5.