Before revision:  We then perform  single cell and tissue simulations in presence of various combination of the mechanisms and applied stretch , in order to assess the relative significance of each mechanism in determining action potential duration, conduction velocity and rotor stability.
After revision:  We then perform computational simulations using single cell and tissue simulations in presence of various combination of the mechanisms and applied stretch , in order to assess the relative significance of each mechanism in determining action potential duration, conduction velocity and rotor stability.