The Barts Health Nhs Trust Covid-19 Cohort: Characteristics, Outcomes And Risk Scoring Of Patients In East London

T Crocker-Buque,S Williams,A R Brentnall,R Gabe, S Duffy,J R Prowle,C Orkin,H Kunst, T Cutino-Moguel,D Zenner,B Bloom,M Melzer, S de Freitas,M Darmalingam,K McCafferty,V Kapil,P Pfeffer,J Martin, Y Gourtsoyannis, S Chandran, A Dhariwal, R Rachman,I Milligan, D Mabayoje, E Adobah, J Falconer, H Nugent,M Yaqoob,D Collier,R Pearse,M Caulfield,S Tiberi

INTERNATIONAL JOURNAL OF TUBERCULOSIS AND LUNG DISEASE(2021)

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Abstract
BACKGROUND: Barts Health National Health Service Trust (BHNHST) serves a diverse population of 2.5 million people in London, UK. We undertook a health services assessment of factors used to evaluate the risk of severe acute respiratory coronavirus 2 (SARS-CoV-2) infection. METHODS: Patients with confirmed polymerase chain reaction (PCR) test results admitted between 1 March and 1 August 2020 were included, alongwith clinician diagnosed suspected cases. Prognostic factors from the 4C Mortality score and 4C Deterioration scores were extracted from electronic health records and logistic regression was used to quantify the strength of association with 28-day mortality and clinical deterioration using national death registry linkage. RESULTS: Of 2783 patients, 1621 had a confirmed diagnosis, of whom 61% were male and 54% were from Black and Minority Ethnic groups; 26% died within 28 days of admission. Mortality was strongly associated with older age. The 4C mortality score had good stratification of risk with a calibration slope of 1.14 (95% CI 1.01-1.27). It may have under-estimated mortality risk in those with a high respiratory rate or requiring oxygen. CONCLUSION: Patients in this diverse patient cohort had similar mortality associated with prognostic factors to the 4C score derivation sample, but survival might be poorer in those with respiratory failure.
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KEY WORDS, COVID-19, SARS-CoV-2, cohort study, mortality, clinical risk
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