Atrioventricular Reentrant Tachycardia by ECG Finding

**Semantic type:** Finding

**Definition:** An electrocardiographic finding of a regular supraventricular tachycardia which utilizes an atrioventricular bypass tract as its retrograde limb (orthodromic tachycardia) or as its antegrade limb (antidromic tachycardia). QRS complexes during sinus rhythm may show preexcitation. During orthodromic tachycardia the preexcitation is not present and a retrograde P wave may appear after the QRS complex. During antidromic tachycardia the QRS complex is preexcited. (CDISC)

**Synonyms:** - AV RE-ENTRANT TACHYCARDIA - AV Reentrant Supraventricular Tachycardia - AV Reentrant Tachycardia - Atrioventricular Reentrant Tachycardia - Atrioventricular Reentrant Tachycardia by EKG Finding