Atrioventricular (AV) nodal reentrant tachycardia, or AVNRT, is a condition in which the heart’s rhythm is too fast. It is one of several types of tachycardia (fast rhythm) of the heart. It also is a type of supraventricular tachycardia (SVT), meaning that it originates from a location within the heart above the bundle of heart muscle cells that help control […]