The most common cause of a pathologic narrow complex tachycardia that is regular and not atrial fibrillation or atrial flutter is AVNRT or atrioventricular reentrant tachycardia.

In this situation, the ventricular (QRS) rate will be exactly 150 bpm and regular. CLINICAL PEARL: A narrow complex tachycardia at a ventricular rate of exactly 150 bpm is very commonly atrial ...

ii While this review focuses on differentiating between AT, AVNRT, and AVRT there are other less common narrow complex tachycardias that one must consider. Examples include nodofasciular ...

None of the patients with AVNRT had a history of regular palpitations or regular narrow complex tachycardia. Patients with AVNRT tended to be younger than those without. In 13 patients ...