Evaluation of P-Possum and O-Possum scores in prediction of 30 day mortality rate in patients undergoing resection for Oesophageal cancer

Abstract

Background In the last two decades, P- POSSUM has been used for the prediction of post operative mortality rates in general surgery based on certain clinical parameters. The speciality based O-POSSUM uses, by and large, the same parameters with some modification in predicting mortality in upper gastrointestinal surgery. These clinical parameters are available in our referral hospitals where oesophagectomy is likely to be performed. Studies to assess the efficacy of these models in oesophagectomy have been published but literature on this in our setup is lacking. 1,2,3. The aim of this study was to determine the accuracy of P-POSSUM and O-POSSUM in predicting the risk of 30- day mortality amongst patients undergoing resection for oesophageal cancer. Objective: To determine the accuracy of P-POSSU~ and O-POSSUM scores in predicting mortality rates in patients undergoing resection for oesophageal cancer at KNH and Nyeri PGH. Study design: A combined prospective and retrospective ., month study based at KNH, cardiothoracic surgery unit and Nyeri PGH. Material and method: Physiological and operative details of the selected patients were taken based on the parameters set out in the formulae. The predicted mortality was calculated by a preset formula and compared with the actual observed mortality rates.