http://www.elarasystems.com This 3D animation shows the inner working of the heart. Blood flow is animated through the atria and ventricles, electrical pathways are show in healthy cardiac anatomy as well as a hear with an arrhythmia. Heart diseases may cause a tachycardia, bradycardia, ventricular tachycardia (VT), right ventricular nodal tachycardia and others.