Table 1.

SF_VB under normal and impaired conduction

	Control		20% gNa
x (mm)	2.5	3.5	2.5	3.5
CmΔVm + Qion	56.72	59.65	45.35	50.98
tA (ms)	1.12	0.86	2.26	3.82
Qthr	34.11	33.67	38.90	41.98
SFVB	1.66	1.77	1.17	1.21

Numerical examples from two points along horizontal axis in the myocardial region, where Q_s = 0, for 120-μm strand with normal and impaired g_Na. In both cases, SF_VB increases with distance along preparation (x). SF_VB decreases with impaired g_Na due to reduced Q_ion and increased Q_thr. Units for C_mΔV_m + Q_ion and Q_thr are nC/cm².