Single ventricular premature complexes (VPCs), as well as pairs and ... Prematurity of an ectopy is determined by the intrinsic escape rhythm of the ectopic focus. For ventricular ectopy, an ...

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 ...