Major monovalent ionic currents for the Purkinje cell ionic model. Top: Original PRd model is shown. Middle: Adjusted model with TRPM4 channel current and Ieqv subtracted is shown. Bottom: ITRPM4 is compared to IEqv and its constituent currents. The cell was stimulated at pacing cycle length (PCL) = 1000 ms. Kr, rapidly activating delayed rectifier K+ current; NCX, Na+-Ca2+ exchanger current; NaK, Na+-K+ pump current; NaL2, NaL3, late Na+ currents; to1, transient outward current type 1 carried by K+. To see this figure in color, go online.