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  1. AVNRT (atrioventricular nodal reentry tachycardia)

This is a narrow QRS complex tachycardia with a very fast heart rate (about 250 beats per minute). It is quite difficult to indentify any P wave activity to determine the exact etiology. Most commonly, a narrow complex tachycardia in a healthy person of abrupt onset is AVNRT (atrioventricular nodal reentry tachycardia). Alternatively, AVRT (atrioventricular reentry tachycardia) could be the diagnosis. Interestingly, this patient did indeed have Wolff-Parkinson-White syndrome, however this rhythm was thought to be AVNRT and not AVRT (which occurs with WPW) and terminated with adenosine.

Related Topic Reviews: AVNRT ECG Review