After adjusting for Utstein predictors of survival as well as CPR quality measures , the odds of survival to hospital discharge were significantly higher for patients with pre-shock pause < 10s ( OR : 1.52 , 95 % CI : 1.09 , 2.11 ) and peri-shock pause < 20s ( OR : 1.82 , 95 % CI : 1.17 , 2.85 ) when compared to patients with pre-shock pause 20s and peri-shock pause 40s .