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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: J Mol Cell Cardiol. 2009 Aug 7;48(1):172. doi: 10.1016/j.yjmcc.2009.07.028

Figure 7. Effect of membrane hyperpolarization on INa in the newborn model.

Figure 7

A. Simulated spontaneous action potentials under control conditions (gray) and with 4x (broken black) and 5x (solid black) background K conductance. B. Calculated Na current flowing during spontaneous activity depicted in panel A. There is an absence of significant current flow during control conditions. When background K conductance is increased, Na current flows during both diastole and the AP upstroke.