In this first part of our 2-part series on Cardiac Arrest Controversies Rob Simard, Bourke Tillman, Sara Gray and Scott Weingart discuss with Anton how best to ensure high quality chest compressions, the pros and cons of mechanical CPR, the literature on dual sequential defibrillation and optimizing pad placement, epinephrine vs vasopressin, amiodarone vs lidocaine, when to consider IV calcium and sodium bicarbonate, esmolol, airway considerations, sedation in cardiac arrest, the pros and cons of end-tidal CO2 and more...