To determine the accuracy of end-tidal carbon dioxide monitoring during cardiopulmonary resuscitation as a predictor of survival, 18 patients who were admitted at the Philippine Heart Center were included in the study. The end-tidal carbon dioxide levels taken at baseline, 5 min., 10 min., 15 min., and 20 min. were taken while resuscitation was being instituted. Of the 18 patients studied, 9 survived, and 9 had failed resuscitation. The p values of the end-tidal carbon dioxide level at baseline, 5 min., 10 min., 15 min., and 20 min. were significant in identifying survivors from non-survivors. Using a cut-off value of 15 mmHg. The sensitivity, specificity, positive predictive value and negative predictive value was 89%. Reports in animal studies and in out-of-hospital CPR have indeed proven the predictive value of end-tidal carbon dioxide value as an easy and non-invasive tool in determining survival. This study has reproduced such findings in in-hospital settings, despite the fact that the number of subjects did not meet the calculated sample size.