Table 1. Steady-state activation of I Na in NZPCs and IZPCs.
| Peak density(pA/pF) | V0.5(mV) | k(mV) | Erev(mV) | |
|---|---|---|---|---|
| NZPCs(n=19) | 14.6±1.3 | -32.4±1.3 | 6.2±0.2 | 0.55±1.3 |
| IZPCs(n=11) | 14.7±1.9 | -30.4±1.3 | 6.4±0.4 | 0.27±1.5 |
NZPCs indicate Purkinje myocytes dispersed from subendocardium the left ventricle of non-infarcted hearts. IZPCs indicate Purkinje myocytes from subendocardium of 48-hour infarcted hearts. Values for the half-maximum voltage, V0.5, and the slope factor, k, were obtained by best-fitting the data from each cell to a Boltzmann function. Erev indicates reversal potential of I-V curves of I Na. All data are presented as mean ± SE.