Because the normal ventricular conduction system (His-Purkinje) is used, the QRS complex is frequently narrow. A junctional rhythm is normally slow — less than 60 beats per minute. When faster ...

This is a type of narrow complex tachycardia, with a narrow QRS in the ECG. Ventricle pacemaker cells have a normal rate between 20 and 40 bpm. A faster rhythm is known as accelerated ...

Now, look at the rhythm strip at the bottom in lead V1 to see the AV dissociation. This ECG also meets the Brugada Criteria for concordance. In this LBBB pattern, all the QRS complexes are ...

Lead II is frequently unrepresentative of QRS configurations, especially for arrhythmias. Here, there is atrial bigeminy due to premature atrial complexes. Although the last QRS in lead II is ...

Congenital third-degree AV block with wide QRS rhythm, complex ventricular ectopy, or ventricular dysfunction. Congenital third-degree AV block in infant with HR <55 beats/min, or HR <70 beats/min ...