Table 1.

Parameters for Na⁺-current density, activation, and inactivation

	Current density (pA/pF)		Steady-state activation (SSA)			Steady-state inactivation (SSI)
	n		n	V1/2 (mV)	k	n	V1/2 (mV)	k
Nav1.5 alone	10	−57.94 ± 19.34	13	−22.70 ± 0.77	5.43 ± 0.17	12	−68.06 ± 0.65	4.90 ± 0.19
Nav1.5 + β1 WT	19	−67.11 ± 10.04	12	−23.90 ± 1.37	5.64 ± 0.19	14	−68.94 ± 0.59	4.78 ± 0.11
Nav1.5 + β1B WT	17	−106.21 ± 11.71∗	10	−23.83 ± 1.29	5.08 ± 0.17	13	−65.50 ± 0.54∗	4.59 ± 0.14
Nav1.5 + β1B R225C	23	−111.41 ± 9.04∗	5	−24.19 ± 0.69	5.32 ± 0.13	20	−68.52 ± 0.52	4.77 ± 0.15

k = slope; n = number of recordings; V_1/2 = voltage of half-maximal activation/inactivation.

^∗P < .05 vs Na_v1.5 alone, compared by paired 2-tailed Student t test.