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Fig. 4. Voltage dependence of inactivation and activation kinetics of
INa in atrial and ventricular myocytes of the rainbow
trout heart. (A) Representative tracings of INa at -20 mV.
(B) Mean (± s.e.m.) time constant of inactivation (
) and (C)
time-to-peak current at different voltages. The results are means (±
s.e.m.) of 12-14 myocytes. Asterisks show a significant difference
(P<0.05) between atrial and ventricular myocytes.