Table 1.

Parameters of activation and inactivation from Boltzmann fits (millivolts) to the curves produced from I_Na in myocytes from the LV and RV of WT and Scn5a+/− hearts (n = 17 for activation; n = 12 for inactivation for each group).

	activation		inactivation
	V1/2	k	V1/2	k
WT LV	−58.88 ± 2.85	3.65 ± 0.66	−74.64 ± 1.83	7.95 ± 0.62
WT RV	−60.42 ± 3.04	4.14 ± 0.42	−75.35 ± 1.72	7.21 ± 0.60
Scn5a+/− LV	−64.61 ± 2.96	3.44 ± 0.78	−84.16 ± 1.53a	6.56 ± 0.71
Scn5a+/− RV	−63.69 ± 3.40	5.46 ± 0.93	−91.12 ± 1.64a,b	6.61 ± 0.74

^aSignificant effect of genotype.

^bSignificant effect of cardiac ventricle.