Termination of atrio-ventricular nodal reentrant tachycardia

Patient

Young woman 24 years of age with frequent, regular tachycardias ceasing spontaneously after about 30 seconds;

Trace

Regular tachycardia, with narrow QRS, of 200 bpm; 1:1 atrioventricular conduction; probable atrial activity at the end of the QRS, negative in inferior leads and positive in V1 and aVR;

Trace

Termination of the tachycardia after injection of verapamil; the modification of the QRS pattern on the sinus complexes confirms that it was indeed a retrograde atrial conduction;

Exergue

The typical electrocardiographic pattern of intranodal tachycardia corresponds to a regular narrow QRS tachycardia, with 1:1 atrioventricular conduction and an indistinguishable atrial activity since superimposed on the QRS complex.