By M. S. Spach, P. Dolber, J. F. Heidlage (auth.), S. Sideman D.Sc., R. Beyar M.D., D.Sc. (eds.)
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Additional info for Activation, Metabolism and Perfusion of the Heart: Simulation and experimental models
Akademisk Forlag, Copenhagen. 10. Hodgkin AL, Huxley AF (1952): A quantitative description of the I)lembrane current and its application to conduction and excitation in nerve. J Physiol (Lond) 117: 500-544. 11. Ebihara L, Johnson EA (1980): Fast sodium current in cardiac muscle. A quantitative description. Biophys J 32: 779-790. 12. Fozzard HA, January CT, Makielski JC (1985): New studies of the excitatory sodium currents in heart muscle. Circ Res 56: 475-485. 13. Liiuger P (1985): Ionic channels with conformational substrates.
The absolute values of the derivative peaks associated with the smallest potential deflections during interval 2 became progressively larger than the other derivatives (arising from larger potential deflections) in going to the first derivative and then to the second derivative. In the middle panel (Figure SA), the negative peak of the first derivative of deflection 3 and the negative peaks during interval 2 have a similar amplitude. However, the negative peaks of the derivative during interval 2 represented a marked relative increase compared to the very low amplitude of the original potential deflections and, conversely, the negative peak of the derivative of 3 represented considerable relative decrease compared to the 21 A ¢e (mV) B ..
In Figure SA (1) the transmembrane potential rises faster and the amplitude is greater during slow (8 T ) propagation than during fast longitudinal (8 L ) propagation. The directionally dependent differences in shape were equally marked, or accentuated, when the action potential was initiated at less negative take-off potentials by early premature stimuli (Figure SA (2)). However, the derivatives in each case (Figure 5B) confirmed the theoretical prediction that the maximum negative slope of the extracellular potential occurs at the same time as Vmox of the transmembrane potential (time difference <50 J)-sec).