Any tachycardic rhythm with a left or right bundle branch block that is NOT ventricular tachycardia is considered "supraventricular tachycardia with aberrancy". This would even include sinus ...

Atrioventricular nodal reentry tachycardia, a form of supraventricular tachycardia ... Diagnosis is made on the 12-lead ECG. Findings include a narrow complex tachycardia, a P wave that occurs ...