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Comorbidity and bystander cardiopulmonary resuscitation in out-of-hospital cardiac arrest.

Journal article
Authors Geir Hirlekar
Martin Jonsson
Thomas Karlsson
Maria Bäck
Araz Rawshani
Jacob Hollenberg
Per Albertsson
Johan Herlitz
Published in Heart (British Cardiac Society)
ISSN 1468-201X
Publication year 2020
Published at Institute of Medicine, School of Public Health and Community Medicine
Institute of Medicine
Institute of Medicine, Department of Molecular and Clinical Medicine
Language en
Subject categories Cardiovascular medicine


​OBJECTIVE: Cardiopulmonary resuscitation (CPR) performed before the arrival of emergency medical services (EMS) is associated with increased survival after out-of-hospital cardiac arrest (OHCA). The aim of this study was to determine whether patients who receive bystander CPR have a different comorbidity compared with patients who do not, and to determine the association between bystander CPR and 30-day survival when adjusting for such a possible difference. ​METHODS: Patients with witnessed OHCA in the Swedish Registry for Cardiopulmonary Resuscitation between 2011 and 2015 were included, and merged with the National Patient Registry. The Charlson Comorbidity Index (CCI) was used to measure comorbidity. Multiple logistic regression was used to examine the effect of CCI on the association between bystander CPR and outcome. ​RESULTS: In total, 11 955 patients with OHCA were included, 71% of whom received bystander CPR. Patients who received bystander CPR had somewhat lower comorbidity (CCI) than those who did not (mean±SD: 2.2±2.3 vs 2.5±2.4; p<0.0001). However, this difference in comorbidity had no influence on the association between bystander CPR and 30-day survival in a multivariable model including other possible confounders (OR 2.34 (95% CI 2.01 to 2.74) without adjustment for CCI and OR 2.32 (95% CI 1.98 to 2.71) with adjustment for CCI). ​CONCLUSION: Patients who undergo CPR before the arrival of EMS have a somewhat lower degree of comorbidity than those who do not. Taking this difference into account, bystander CPR is still associated with a marked increase in 30-day survival after OHCA.

Page Manager: Webmaster|Last update: 9/11/2012

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