Evidence for CPR before defibrillation Cobb JAMA 1999 –Prospective observational trial, N=1117 –Pre-intervention = defibrillate ASAP –Post-intervention = 90 sec CPR before defib –Survival to d/c Defib First CPR FirstPNNT Overall24% 30%.0416 Response < 4min31% 32%.87 Response > 4min17% 27%.007 10