Reentrant tachycardias are a type of cardiac arrhythmia characterized by a rapid heart rate caused by a reentry circuit within the heart. This circuit allows electrical impulses to circulate repeatedly, leading to the rapid contraction of the heart muscles. These tachycardias can be classified into different types, including atrioventricular nodal reentrant tachycardia (AVNRT) and atrioventricular reentrant tachycardia (AVRT).
