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  • Resuscitation · Oct 2021

    Observational Study

    Title: Electrical rhythm degeneration in adults with out-of-hospital cardiac arrest according to the no-flow and bystander low-flow time.

    • Alexis Cournoyer, Jean-Marc Chauny, Jean Paquet, Brian Potter, Yoan Lamarche, Luc de Montigny, Eli Segal, CavayasYiorgios AlexandrosYAFaculty of Medicine, Department of Medicine, Université de Montréal, Montréal, Québec, Canada; Department of Medicine, Service of Intensive Care Medicine, Hôpital du Sacré-Cœur de Montréal, CIUSSS-NIM, Montréal, Québec, Canada;, Martin Albert, Judy Morris, Justine Lessard, Martin Marquis, Sylvie Cossette, Véronique Castonguay, and Raoul Daoust.
    • Faculty of Medicine, Department of Family Medicine and Emergency Medicine, Université de Montréal, Montréal, Québec, Canada; Centre de Recherche de l'Hôpital du Sacré-Cœur de Montréal, Montréal, Québec, Canada; Department of Emergency Medicine, Hôpital du Sacré-Cœur de Montréal, CIUSSS-NIM, Montréal, Québec, Canada; Department of Emergency Medicine, Hôpital Maisonneuve-Rosemont, CIUSSS-EIM, Montréal, Québec, Canada; Corporation d'Urgences-santé, Montréal, Québec, Canada. Electronic address: alexis.cournoyer@umontreal.ca.
    • Resuscitation. 2021 Oct 1; 167: 355-361.

    AimsFor out-of-hospital cardiac arrest (OHCA) patients, the influence of the delay before the initiation of resuscitation, termed the no-flow time (NFT), and duration of bystander-only resuscitation low-flow time (BLFT) on the type of electrical rhythm observed has not been well described. The objective of this study is to determine the relationship between NFT, BLFT and the likelihood of a shockable rhythm over time.MethodsUsing a North American prospective registry (2005-2015; mostly urban settings), we selected adult (18 years and over) patients who experienced a witnessed OHCA from a suspected cardiac etiology. Patients with an emergency medical services witnessed OHCA were only included in sensitivity analyses. The association between the NFT, BLFT and the presence of a shockable rhythm was evaluated using a multivariable logistic regression adjusting for the registry version, age, sex, and public location.ResultsA total of 229,632 patients were logged in the registry, 50,957 of whom were included. Of these, 17,704 (34.7%) had an initial shockable rhythm. After the first minute, a significant decrease over time in the occurrence of shockable rhythm is observed but is slower when bystander cardiopulmonary resuscitation (CPR) is provided (each supplemental minute of BLFT: adjusted odds ratio = 0.95, 95 %CI = 0.94-0.95; each supplemental minute of NFT: adjusted odds ratio = 0.91, 95 %CI = 0.90-0.91]).ConclusionsIn this large observational study, we were able to demonstrate that longer NFT were associated with lower odds of shockable presenting rhythms. Bystander CPR significantly mitigates the degradation of shockable rhythms over time, strengthening the need to improve bystander CPR rates around the world.Copyright © 2021 Elsevier B.V. All rights reserved.

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