National Early Warning Score 2 Lactate (News2-L) In Predicting Early Clinical Deterioration In Patients With Dyspnoea In Prehospital Care

Abstract

Objective. To evaluate the ability of the NEWS2-L (NationalEarly Warning Score 2 Lactate) scale to predict the risk ofearly clinical deterioration (mortality within 48 hours) inpatients with dyspnoea treated by the Medical EmergencyServices compared with NEWS2 and lactate in isolation.Methods. Prospective, multi-centre study of a cohort of638 patients with dyspnoea treated in the ambulance andpriority-transferred to a hospital emergency service in thecities of Valladolid, Salamanca, Segovia or Burgos (Spain).We collected clinical, analytical and demographic data.The main outcome measure was all-cause mortality within48 hours. The recommendations of the Royal College ofPhysicians were followed to calculate NEWS2. WhenNEWS2 and LA prehospital values were obtained, thetwo values were added together to obtain the NEWS2-L Results. Mortality within 48 hours was fifty-six patients (8.8%). The NEWS2-L scale obtained an area under the curve (AUC) of the receiver operating characteristics (ROC) for mortality within 48 hours of 0.854 (CI 95% 0.790–0.917), at seven days of 0.788 (CI 95% 0.729–0.848) and at 30 days of 0.744 (CI 95% 0.692–0.796); in all cases p<0.001, with a significant decrease between the value at 48 hours and at 30 days. Conclusion. The NEWS2-L scale was found to be significantly superior to the NEWS2 scale and similar to lactate in predicting early clinical deterioration in patients with dyspnoea. This scale can help a nurse detect these patients early, as part of their regular practice, and thus guide therapeutic efforts