379. What is the Ashman phenomenon? / Define pre-excitation / Describe 3 mechanisms for dysrhythmia formation July 6th, 2008 by reuben in pharmacology/physiology Back Top Tags: card 378. Which artery supplies the AV node? / Pacemaker rates at three different sites / Describe the conduction pathway / Which conduction defects are associated with RCA and LAD occlusion? 380. Vaughan Williams Class IA / Class IB Leave a Reply Cancel reply Please post any discussion to the emupdates Reddit page.