The influence of excluding patients with bystander return of spontaneous circulation in the current OHCA database
Abstract Background The effect of bystander interventions has been extensively evaluated by cerebral function after 1 month post-resuscitation. However, patients who received bystander cardiopulmonary resuscitation (BCPR) and achieved the return of spontaneous circulation (ROSC) before the arrival o...
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doaj-41d7179df9e24e1da825acd758b78fef2020-11-24T22:16:35ZengBMCInternational Journal of Emergency Medicine1865-13721865-13802018-09-011111810.1186/s12245-018-0197-4The influence of excluding patients with bystander return of spontaneous circulation in the current OHCA databaseHiroshi Otani0Ryo Sagisaka1Hideharu Tanaka2Hiroshi Takyu3Takahiro Hara4Toru Shirakawa5Shota Tanaka6Akira Maki7Graduate School of Emergency Medical System, Kokushikan UniversityGraduate School of Emergency Medical System, Kokushikan UniversityGraduate School of Emergency Medical System, Kokushikan UniversityGraduate School of Emergency Medical System, Kokushikan UniversityGraduate School of Emergency Medical System, Kokushikan UniversityGraduate School of Emergency Medical System, Kokushikan UniversityResearch Institute of Disaster Management and EMS, Kokushikan UniversityGraduate School of Emergency Medical System, Kokushikan UniversityAbstract Background The effect of bystander interventions has been extensively evaluated by cerebral function after 1 month post-resuscitation. However, patients who received bystander cardiopulmonary resuscitation (BCPR) and achieved the return of spontaneous circulation (ROSC) before the arrival of the emergency medical system (EMS) are routinely defined with an unknown electrocardiogram (ECG) and are usually excluded before analysis. The aim is to determine the influence of excluding patients with unknown first monitored rhythm, which includes cases of bystander ROSC, from the out-of-hospital cardiac arrest (OHCA) database. Methods This nationwide population-based observational study was conducted in Japan using Utstein data from 2011 to 2014. In total, 91,995 patients with bystander-witnessed cardiogenic OHCA received resuscitation attempts in the pre-hospital setting. These patients were divided into three groups by the first monitored rhythm upon EMS arrival. We analysed the differences of datasets that included and excluded the unknown group and determined the effect on outcomes by multivariate logistic regression and odds ratios (ORs) with 95% confidence intervals (95% CIs). Results When the unknown group was excluded from the data, the adjusted odds ratio (AOR) of cardiopulmonary resuscitation (CPR) to favourable cerebral performance category (CPC) 1 or 2 was decreased (conventional CPR: AOR, 1.90 to 1.58; chest-compression-only CPR: AOR, 2.08 to 1.69) compared to the unknown group’s inclusion. Conversely, the AOR of public-access defibrillation (PAD) was increased (AOR, 4.51 to 6.13). Conclusions The exclusion of unknown ECGs from a dataset may lose ROSC patients by bystander CPR, causing selection bias to affect outcomes.http://link.springer.com/article/10.1186/s12245-018-0197-4First monitored rhythmBystander interventionPublic-access defibrillationCardiopulmonary resuscitationOut-of-hospital cardiac arrest |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hiroshi Otani Ryo Sagisaka Hideharu Tanaka Hiroshi Takyu Takahiro Hara Toru Shirakawa Shota Tanaka Akira Maki |
spellingShingle |
Hiroshi Otani Ryo Sagisaka Hideharu Tanaka Hiroshi Takyu Takahiro Hara Toru Shirakawa Shota Tanaka Akira Maki The influence of excluding patients with bystander return of spontaneous circulation in the current OHCA database International Journal of Emergency Medicine First monitored rhythm Bystander intervention Public-access defibrillation Cardiopulmonary resuscitation Out-of-hospital cardiac arrest |
author_facet |
Hiroshi Otani Ryo Sagisaka Hideharu Tanaka Hiroshi Takyu Takahiro Hara Toru Shirakawa Shota Tanaka Akira Maki |
author_sort |
Hiroshi Otani |
title |
The influence of excluding patients with bystander return of spontaneous circulation in the current OHCA database |
title_short |
The influence of excluding patients with bystander return of spontaneous circulation in the current OHCA database |
title_full |
The influence of excluding patients with bystander return of spontaneous circulation in the current OHCA database |
title_fullStr |
The influence of excluding patients with bystander return of spontaneous circulation in the current OHCA database |
title_full_unstemmed |
The influence of excluding patients with bystander return of spontaneous circulation in the current OHCA database |
title_sort |
influence of excluding patients with bystander return of spontaneous circulation in the current ohca database |
publisher |
BMC |
series |
International Journal of Emergency Medicine |
issn |
1865-1372 1865-1380 |
publishDate |
2018-09-01 |
description |
Abstract Background The effect of bystander interventions has been extensively evaluated by cerebral function after 1 month post-resuscitation. However, patients who received bystander cardiopulmonary resuscitation (BCPR) and achieved the return of spontaneous circulation (ROSC) before the arrival of the emergency medical system (EMS) are routinely defined with an unknown electrocardiogram (ECG) and are usually excluded before analysis. The aim is to determine the influence of excluding patients with unknown first monitored rhythm, which includes cases of bystander ROSC, from the out-of-hospital cardiac arrest (OHCA) database. Methods This nationwide population-based observational study was conducted in Japan using Utstein data from 2011 to 2014. In total, 91,995 patients with bystander-witnessed cardiogenic OHCA received resuscitation attempts in the pre-hospital setting. These patients were divided into three groups by the first monitored rhythm upon EMS arrival. We analysed the differences of datasets that included and excluded the unknown group and determined the effect on outcomes by multivariate logistic regression and odds ratios (ORs) with 95% confidence intervals (95% CIs). Results When the unknown group was excluded from the data, the adjusted odds ratio (AOR) of cardiopulmonary resuscitation (CPR) to favourable cerebral performance category (CPC) 1 or 2 was decreased (conventional CPR: AOR, 1.90 to 1.58; chest-compression-only CPR: AOR, 2.08 to 1.69) compared to the unknown group’s inclusion. Conversely, the AOR of public-access defibrillation (PAD) was increased (AOR, 4.51 to 6.13). Conclusions The exclusion of unknown ECGs from a dataset may lose ROSC patients by bystander CPR, causing selection bias to affect outcomes. |
topic |
First monitored rhythm Bystander intervention Public-access defibrillation Cardiopulmonary resuscitation Out-of-hospital cardiac arrest |
url |
http://link.springer.com/article/10.1186/s12245-018-0197-4 |
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