In the new STAT!Ref resource A 1st Book on ECGs, the goal is to review the basics so that any provider can attain a basic understanding of what an ECG is without any prior knowledge. That said, those who have had brief exposure to ECG interpretation can rapidly progress through the early parts of this resource.
If the ventricles are continuously activated by a ventricular focus whose rhythm is under 40/min, the rhythm is called idioventricular rhythm. The ventricular activity may also be formed from short (less than 20 s) bursts of ventricular activity at higher rates (between 40 and 120/min). This situation is called accelerated idioventricular rhythm.