RT Journal Article SR Electronic T1 Shock Index in the early assessment of febrile children at the emergency department: a prospective multicentre study JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP archdischild-2020-320992 DO 10.1136/archdischild-2020-320992 A1 Nienke N Hagedoorn A1 Joany M Zachariasse A1 Dorine Borensztajn A1 Elise Adriaansens A1 Ulrich von Both A1 Enitan D Carrol A1 Irini Eleftheriou A1 Marieke Emonts A1 Michiel van der Flier A1 Ronald de Groot A1 Jethro Adam Herberg A1 Benno Kohlmaier A1 Emma Lim A1 Ian Maconochie A1 Federico Martinón-Torres A1 Ruud Gerard Nijman A1 Marko Pokorn A1 Irene Rivero-Calle A1 Maria Tsolia A1 Dace Zavadska A1 Werner Zenz A1 Michael Levin A1 Clementien Vermont A1 Henriette A Moll A1 , YR 2021 UL http://adc.bmj.com/content/early/2021/06/28/archdischild-2020-320992.abstract AB Objective (1) To derive reference values for the Shock Index (heart rate/systolic blood pressure) based on a large emergency department (ED) population of febrile children and (2) to determine the diagnostic value of the Shock Index for serious illness in febrile children.Design/setting Observational study in 11 European EDs (2017–2018).Patients Febrile children with measured blood pressure.Main outcome measures Serious bacterial infection (SBI), invasive bacterial infection (IBI), immediate life-saving interventions (ILSIs) and intensive care unit (ICU) admission. The association between high Shock Index (>95th centile) and each outcome was determined by logistic regression adjusted for age, sex, referral, comorbidity and temperature. Additionally, we calculated sensitivity, specificity and negative/positive likelihood ratios (LRs).Results Of 5622 children, 461 (8.2%) had SBI, 46 (0.8%) had IBI, 203 (3.6%) were treated with ILSI and 69 (1.2%) were ICU admitted. High Shock Index was associated with SBI (adjusted OR (aOR) 1.6 (95% CI 1.3 to 1.9)), ILSI (aOR 2.5 (95% CI 2.0 to 2.9)), ICU admission (aOR 2.2 (95% CI 1.4 to 2.9)) but not with IBI (aOR: 1.5 (95% CI 0.6 to 2.4)). For the different outcomes, sensitivity for high Shock Index ranged from 0.10 to 0.15, specificity ranged from 0.95 to 0.95, negative LRs ranged from 0.90 to 0.95 and positive LRs ranged from 1.8 to 2.8.Conclusions High Shock Index is associated with serious illness in febrile children. However, its rule-out value is insufficient which suggests that the Shock Index is not valuable as a screening tool for all febrile children at the ED.Data are available in a public, open access repository. A data set containing individual participant data will be made available in a public data repository containing a specific DOI. The data will be anonymised and will not contain any identifiable data. The data manager of the PERFORM consortium can be contacted for inquiries (Tisham.de@imperial.ac.uk).