Supernormal conduction: 2nd degree AV block with rare captures; accelerated ventricular rhythm

This complicated rhythm strip illustrates 'supernormal' conduction... a situation where conduction is better than expected. The ladder diagram shows that the accelerated ventricular rhythm prevents most of the sinus impulses from reaching the ventricles. Only appropriately timed sinus impulses reach the ventricle - indicated by the C or capture beats. Supernormal conduction doesn't mean better than normal, just the appearance of conducted beats when not expected.