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Background  The effects of the body mass index (BMI) on outcomes of patients resuscitated from cardiac arrest are controversial. Therefore, the current study investigated the association between the BMI and the favourable neurologic outcomes and survival to discharge of patients resuscitated from out-of-hospital cardiac arrest (OHCA).    Methods  This multicentre, prospective, nationwide OHCA registry-based study was conducted using data from the Korean Cardiac Arrest Resuscitation Consortium (KoCARC). We enrolled hospitals willing to collect patient height and weight and included patients who survived to the hospital between October 2015 and June 2018. The included patients were categorised into the underweight (< 18.5 kg/m 2 ), normal weight (≥18.5 to < 25 kg/m 2 ), overweight (≥25 to < 30 kg/m 2 ), and obese groups (≥30 kg/m 2 ) according to the BMI per the World Health Organization (WHO) criteria. The primary outcome was a favourable neurologic outcome; the secondary outcome was survival to discharge. Univariate and multivariate analyses were performed to investigate the association between BMI and outcomes.    Results  Nine hospitals were enrolled; finally, 605 patients were included in our analysis and categorised per the WHO BMI classification. Favourable neurologic outcomes were less frequent in the underweight BMI group than in the other groups ( p  = 0.002); survival to discharge was not significantly different among the BMI groups ( p  = 0.110). However, the BMI classification was not associated with favourable neurologic outcomes or survival to discharge after adjustment in the multivariate model.    Conclusion  The BMI was not independently associated with favourable neurologic and survival outcomes of patients surviving from OHCA.    Supplementary Information  The online version contains supplementary material available at 10.1186/s13049-021-00837-x.

scandinavian journal of trauma, resuscitation and emergency medicine

Association between the body mass index and outcomes of patients resuscitated from out-of-hospital cardiac arrest: a prospective multicentre registry study