FP7.8 - Perioperative risk prediction for Emergency Laparotomy in Adults, using the National Emergency Laparotomy Audit (NELA) and the American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) risk prediction tools – an E

Abstract Background Worldwide, emergency laparotomy (EL) is one of the most common procedures. Having an actual 30-day mortality (30-dm) of 10 to 15%, EL has a high mortality rate, particularly in patients >70 years old. Preoperative risk assessment and stratification can improve outcomes. The American-College-of-Surgeons-National Surgical Quality Improvement Program (ACS-NSQIP) and the National Emergency Laparotomy Audit (NELA) risk prediction tools are the most used risk calculators, but both can under or overpredict. Methods This is a single-center, retrospective, cohort study that looked at the correlation between actual and predicted 30-dm using NELA and ACS-NSQIP in adults ≥18, following EL, over 2 years, in a single-tertiary-center from Romania. The primary outcome was defined as the correlation between actual 30-dm and NELA or ACS-NSQIP predicted 30-dm. Statistical analysis was performed using GraphPad-Prism 10.1.1. and Stata18. Results 207 cases were analyzed. Male/female ratio was 1.49; age 65 years (50;77); BMI 26.25kg/m² (23.01;28.35); preoperative lactate 1.8 mmol/L (1.5;3.4); ASA grade 3 (2;4) clinical frailty score 4 (3;4); and Charlson Comorbidity Index 5 (3;8). Actual 30-dm was 31.4% with NELA and ACS-NSQIP predicted 30-dm of 5.78% (1.84;21.48) and 5.5% (1.2;24.2) respectively. NELA and ACS-NSQIP predicted 30-dm expressed a strong positive correlation, R²=0.88; p<0.0001. Both NELA and ACS-NSQIP predicted 30-dm showed a significant positive correlation with actual 30-dm: R²=0.33, p<0.0001; and R²=0.41, p<0.0001 respectively. All data is presented as Median + IQR. Conclusion In a Romanian setting both ACS-NSQIP and NELA risk calculators underpredicted 30-dm, despite expressing a strong positive correlation with actual 30-dm.