Background: The identification and early assessment of peritonitis patient is often required in surgical emergency to select the high risk patients for intensive management for better outcome. This is a comparative study of efficacy between Mannheim peritonitis index and APACHE II in predicting the outcome in patients of peritonitis due to hollow viscous perforation.Methods: Comparative and prospective study in 50 patients of hollow viscous perforation admitted and operated in surgical emergency, Patna Medical College and Hospital from year April 2014 to April 2016 was done. Mannheim peritonitis index and APACHE II score of each case was calculated and the prediction of outcome was compared with the final outcome.Results: In this study with MPI score >25, 22.8% patients expired. MPI score between 25-15, 6.6% patients expired and with score ≤14 none of the patient expired. According to APACHE II system with APACHE II score less than 10, 8.6% patients expired. Between score 11 -20, 36% expired and With APACHE II score above 20, none of the patients survived I.e. 100% mortality.Conclusions: MPI score is easy to apply and easy to calculate but APACHE II score obviously shows more accurate prediction of mortality.

No abstract