Cardiac modeling requires knowledge of biology, physiology, physics, and mathematics.
This section contains close to 100
interactive applets useful in understanding cardiac dynamics.
They range from diffusion of ions and the generation of an action potential
to scroll waves (three-dimensional spiral waves).
The applet on the left uses a simple cell model to
display electrical waves in the heart during simulated normal sinus rhythm,
ventricular tachycardia, and ventricular fibrillation.
Click the buttons to select a rhythm or to apply
a defibrillating pulse to one of the arrhythmias.
It is also possible to induce electrical activations by clicking directly
over the heart surface.
The size of the stimulus is controlled by changing the size in
the "stimulus size" window and pressing return.
At startup the heart is in ventricular fibrillation.