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.

This ECG (Figure 1), recorded in the emergency room, shows a wide complex tachycardia at 205 bpm. Wide complex tachycardias are more likely to be ventricular tachycardia (VT) than supraventricular ...

CLINICAL PEARL: A narrow complex tachycardia at a ventricular rate of ... and has a variable appearance on ECG in regards to the flutter waves.

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 ...