Atrial tachycardia and other ectopic atrial rhythms occur when a site outside of the sinus node, but within the atria, creates action potentials faster than the sinus node. This ectopic focus ...

Multifocal atrial tachycardia occurs when multiple areas, or ectopic foci, within the atrium generate consecutive action potentials that are all conducted to the ventricles. Thus, each QRS complex ...