Siu Chung Leung1, Ling Pong Leung2, Kit Ling Fan2, Wai Lam Yip1. 1. Accident and Emergency Department, Queen Mary Hospital, Hong Kong SAR, China. 2. Emergency Medicine Unit, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.
Abstract
OBJECTIVE: We aim to investigate whether prehospital Modified Early Warning Score (MEWS) can identify non-trauma patients requiring life-saving intervention (LSI) within 4 h of presentation to the ED. METHODS: It was a prospective study of non-trauma ED patients by ambulance who were 16 years or older from 1 to 27 November 2013. Prehospital MEWS was calculated according to vital signs measured by the ambulance crew. Data on patients' demographics, triage category, LSI within 4 h of ED presentation and 24 h mortality were retrieved. LSI was defined as emergency interventions to airway, breathing and circulation, emergency procedures and medications administered. The performance of prehospital MEWS was analysed with sensitivity, specificity, predictive values (PV), likelihood ratios (LR) and the receiver operating characteristic curve. RESULTS: Recruited during the study period were 1493 patients. The median age was 78 years. Of the patients, 49.9% belonged to critical, emergent or urgent triage categories. LSI was required in 321 patients (21.5%). Thirteen died within 24 h of ED presentation. The area under the receiver operating characteristic curve of prehospital MEWS relating to LSI was 0.72 (95% confidence interval 0.69 to 0.75). The sensitivity, specificity, positive PV, negative PV, positive LR and negative LR were 0.57, 0.76, 0.40, 0.87, 2.43 and 0.56, respectively, when prehospital MEWS ≥3 was chosen as the cut-off value. CONCLUSIONS: Prehospital MEWS is useful in identifying non-trauma patients requiring LSI within 4 h of ED presentation. This may in turn enhance the triage accuracy in the ED in addition to clinical assessment.
OBJECTIVE: We aim to investigate whether prehospital Modified Early Warning Score (MEWS) can identify non-traumapatients requiring life-saving intervention (LSI) within 4 h of presentation to the ED. METHODS: It was a prospective study of non-trauma EDpatients by ambulance who were 16 years or older from 1 to 27 November 2013. Prehospital MEWS was calculated according to vital signs measured by the ambulance crew. Data on patients' demographics, triage category, LSI within 4 h of ED presentation and 24 h mortality were retrieved. LSI was defined as emergency interventions to airway, breathing and circulation, emergency procedures and medications administered. The performance of prehospital MEWS was analysed with sensitivity, specificity, predictive values (PV), likelihood ratios (LR) and the receiver operating characteristic curve. RESULTS: Recruited during the study period were 1493 patients. The median age was 78 years. Of the patients, 49.9% belonged to critical, emergent or urgent triage categories. LSI was required in 321 patients (21.5%). Thirteen died within 24 h of ED presentation. The area under the receiver operating characteristic curve of prehospital MEWS relating to LSI was 0.72 (95% confidence interval 0.69 to 0.75). The sensitivity, specificity, positive PV, negative PV, positive LR and negative LR were 0.57, 0.76, 0.40, 0.87, 2.43 and 0.56, respectively, when prehospital MEWS ≥3 was chosen as the cut-off value. CONCLUSIONS: Prehospital MEWS is useful in identifying non-traumapatients requiring LSI within 4 h of ED presentation. This may in turn enhance the triage accuracy in the ED in addition to clinical assessment.
Authors: Ali Yazdanyar; Megan R Greenberg; Zhe Chen; Shuisen Li; Marna Rayl Greenberg; Anthony P Buonanno; David B Burmeister; Shadi Jarjous Journal: J Am Coll Emerg Physicians Open Date: 2022-07-30