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Table 2.

Comparison of the INa in atrial and ventricular myocytes of the rainbow trout heart

Atrial myocytesNVentricular myocytesN
Gmax (pS pF−10.42±0.03 14 0.39±0.02 13 
Steady-state activation     
V0.5 (mV) −39.48±1.00* 14 −33.94±2.56 12 
Slope 7.02±0.53 14 6.20±0.23 12 
Steady-state inactivation     
V0.5 (mV) −84.88±1.01* 13 −79.61±1.37 12 
Slope 5.66±0.43 13 5.79±0.29 12 
Rested-state inactivation, τ (ms) 65.90±8.24* 13 73.50±5.03 12 
Recovery from inactivation, τ (ms) 46.53±7.24 60.72±13.12 
Atrial myocytesNVentricular myocytesN
Gmax (pS pF−10.42±0.03 14 0.39±0.02 13 
Steady-state activation     
V0.5 (mV) −39.48±1.00* 14 −33.94±2.56 12 
Slope 7.02±0.53 14 6.20±0.23 12 
Steady-state inactivation     
V0.5 (mV) −84.88±1.01* 13 −79.61±1.37 12 
Slope 5.66±0.43 13 5.79±0.29 12 
Rested-state inactivation, τ (ms) 65.90±8.24* 13 73.50±5.03 12 
Recovery from inactivation, τ (ms) 46.53±7.24 60.72±13.12 

A statistically significant difference (P<0.05) between atrial and ventricular myocytes is indicated by an asterisk. Gmax, the maximal conductance of INa.

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