The accuracy of NEWS-2 in the emergency prehospital setting in Saudi Arabia

Introduction: Various early warning score tools have been developed to identify clinical deterioration in patients. This study assessed the predictive capacity of the National Early Warning Score 2 (NEWS-2) in the prehospital setting to predict death within 24 hours and 30-day intensive care unit admission. Methods: A single-center observational retrospective study was conducted in the emergency medical services (EMS) of King Abdulaziz Medical City, Riyadh, Saudi Arabia. We included adult patients (> 18 years) who attended the emergency medical service. The primary outcome was 24-hour death and 30-day intensive care unit admission. Sensitivity, specificity, and negative/positive predictive values (NPV/PPV) were determined. Results: The study comprised 1,343 eligible patients. NEWS-2 exhibited a sensitivity of 20% and a specificity of 80% for predicting 24-hour death and a sensitivity of 10% and a specificity of 80% for predicting 30-day intensive care unit admission. The area under the curve for predicting death was 0.529, and for intensive care unit admission was 0.456. Conclusion: Our study underscores the limited utility of NEWS-2 as a predictor of 24-hour death and 30-day intensive care unit admission in adult patients utilizing the emergency medical service. Further extensive studies are warranted to corroborate this study’s findings.