Puschino

A piecewise linear model devised to match cardiac restitution properties

$$F(v,w) = f(v) -w$$ (9)

$$G(v,w) = {1\over \tau(v)}(v-w)$$ (10)

where

$$f(v) = \left\{\begin{array}{cl}-30v,&v<v_1\\ \gamma v-0.12,&... ...\left\{\begin{array}{cl}2&v<v1\\ 16.6&v>v1\end{array}\right.,$$ (11)

with $v_1={0.12\over 30+\gamma}$, $v_2 = {30.12\over 30+\gamma}$.