Conventional Cardiopulmonary Resuscitation Group Research Articles

Extracorporeal cardiopulmonary resuscitation for patients with refractory out-of-hospital cardiac arrest: a propensity score matching, observational study.

Extracorporeal cardiopulmonary resuscitation (ECPR) is increasingly performed as an adjunct to conventional cardiopulmonary resuscitation (CCPR) for refractory out-of-hospital cardiac arrest (OHCA). However, the specific benefits of ECPR concerning survival with favorable neurological outcomes remain uncertain. This study aimed to investigate the potential advantages of ECPR in the management of refractory OHCA. We conducted a retrospective cohort study involved OHCA patients between January 2016 and May 2021. Patients were categorized into ECPR or CCPR groups. The primary endpoint assessed was survival with favorable neurological outcomes, and the secondary outcome was survival rate. Multivariate logistic regression analyses, with and without 1:2 propensity score matching, were employed to assess ECPR's effect. In total, 1193 patients were included: 85underwent ECPR, and 1108 received CCPR. Compared to the CCPR group, the ECPR group exhibited notably higher survival rate (29.4% vs. 2.4%; p < 0.001). The ECPR group also exhibited a higher proportion of survival with favorable neurological outcome than CCPR group (17.6% vs. 0.7%; p < 0.001). Multivariate logistic regression analysis demonstrated that ECPR correlated with increased odds of survival with favorable neurological outcome (adjusted odds ratio: 13.57; 95% confidence interval (CI) 4.60-40.06). Following propensity score matching, the ECPR group showed significantly elevated odds of survival with favorable neurological outcomes (adjusted odds ratio: 13.31; 95% CI 1.61-109.9). This study demonstrated that in comparison to CCPR, ECPR may provide survival benefit and increase the odds of favorable neurological outcomes in selected OHCA patients.

Cost-effectiveness of extracorporeal cardiopulmonary resuscitation vs. conventional cardiopulmonary resuscitation in out-of-hospital cardiac arrest: a pre-planned, trial-based economic evaluation.

When out-of-hospital cardiac arrest (OHCA) becomes refractory, extracorporeal cardiopulmonary resuscitation (ECPR) is a potential option to restore circulation and improve the patient's outcome. However, ECPR requires specific materials and highly skilled personnel, and it is unclear whether increased survival and health-related quality of life (HRQOL) justify these costs. This cost-effectiveness study was part of the INCEPTION study, a multi-centre, pragmatic randomized trial comparing hospital-based ECPR to conventional CPR (CCPR) in patients with refractory OHCA in 10 cardiosurgical centres in the Netherlands. We analysed healthcare costs in the first year and measured HRQOL using the EQ-5D-5L at 1, 3, 6, and 12 months. Incremental cost-effectiveness ratios (ICERs), cost-effectiveness planes, and acceptability curves were calculated. Sensitivity analyses were performed for per-protocol and as-treated subgroups as well as imputed productivity loss in deceased patients. In total, 132 patients were enrolled: 62 in the CCPR and 70 in the ECPR group. The difference in mean costs after 1 year was €5109 (95% confidence interval -7264 to 15 764). Mean quality-adjusted life year (QALY) after 1 year was 0.15 in the ECPR group and 0.11 in the CCPR group, resulting in an ICER of €121 643 per additional QALY gained. The acceptability curve shows that at a willingness-to-pay threshold of €80.000, the probability of ECPR being cost-effective compared with CCPR is 36%. Sensitivity analysis showed increasing ICER in the per-protocol and as-treated groups and lower probabilities of acceptance. Hospital-based ECPR in refractory OHCA has a low probability of being cost-effective in a trial-based economic evaluation.

Extracorporeal Versus Conventional Cardiopulmonary Resuscitation for In-Hospital Cardiac Arrest: A Propensity Score Matching Cohort Study.

Comparing the effects of extracorporeal cardiopulmonary resuscitation (ECPR) and conventional cardiopulmonary resuscitation (CCPR) on outcomes in patients with in-hospital cardiac arrest (IHCA) in China. The benefits of ECPR over CCPR in patients with IHCA remain controversial. This article analyzed data from the BASeline Investigation of In-hospital Cardiac Arrest (BASIC-IHCA) study, which consecutively enrolled patients with IHCA from July 1, 2019, to December 31, 2020. Patients who received ECPR were selected as the case group and matched with patients who received CCPR as the control group by propensity score at a ratio of 1:4. A parallel questionnaire survey of participating hospitals was conducted, to collect data on ECPR cases from January 1, 2021 to November 30, 2021. The primary outcome was survival to discharge or 30-day survival. We included 39 hospitals across 31 provinces in China. Patients receiving cardiopulmonary resuscitation and without contraindications to ECPR were selected from the BASIC-IHCA database. Patients older than 75 years, not witnessed, or with cardiopulmonary resuscitation duration less than 10 min were excluded. None. A total of 4853 patients met the inclusion criteria before matching, with 34 undergoing ECPR (median age, 56.5 yr; 67.65% male) and 4819 underwent CCPR (median age, 59 yr; 64.52% male). There were 132 patients receiving CCPR and 33 patients receiving ECPR who were eventually matched. The ECPR group had significantly higher survival rates at discharge or 30-day survival (21.21% vs. 7.58%, p = 0.048). The ECPR group had significantly lower mortality rates (hazard ratio 0.57; 95% CI, 0.38-0.91) than the CCPR group at discharge or 30 days. Besides the BASIC-IHCA study, the volume of ECPR implementations and the survival rate of patients with ECPR (29.4% vs. 10.4%. p = 0.004) in participating hospitals significantly improved. ECPR may be beneficial compared with CCPR for patient survival after IHCA and should be considered for eligible patients with IHCA.

Extracorporeal cardiopulmonary resuscitation versus conventional cardiopulmonary resuscitation for patients with refractory out-of-hospital cardiac arrest: A retrospective propensity matching analysis.

The incidence of out-of-hospital cardiac arrest (OHCA) is high. Though extracorporeal cardiopulmonary resuscitation (ECPR) has been considered a potential treatment for refractory cardiac arrest after failure of conventional cardiopulmonary resuscitation (CCPR), the benefit of ECPR in refractory OHCA remains uncertain. In this retrospective cohort study, we included patients with refractory OHCA who visited the Emergency Department of the Aerospace Center Hospital between January 2018 and April 2023. We divided the patients into the ECPR Group and the CCPR Group. The primary endpoint of the study was the neurological function of the patients in both groups 3months after the cardiac arrest. We used propensity score matching to reduce selection bias and identified factors associated with good neurological function when OHCA was treated with ECPR by performing univariate and multivariate correlation analyses on surviving patients with good neurological function in the ECPR group. During the study period, we enrolled 133 patients, consisting of 33 in the ECPR group and 100 in the CCPR group. The survival rate of patients with good neurological function at discharge was 18.2% (6/33 cases) in the ECPR group and 9% (9/100 cases) in the CCPR group, p = .20. Three months after discharge, the survival rate of patients with good neurological function was 15.2% (5/33 cases) in the ECPR group and 8% (8/100 cases) in the CCPR group, p = .31. Using propensity score matching, we identified 22 pairs of patients for further analysis. Among these, 3months after discharge, the survival rate of patients with good neurological function was 13.6% (3/22 cases) in the ECPR group and 4.5% (1/22 cases) in the CCPR group, p = .61, and the survival rate at discharge was 18.2% (4/22 cases) in the ECPR group and 4.5% (1/22 cases) in the CCPR group, p = .34. The univariate analysis of patients with good neurological function in the ECPR group showed that time without perfusion, hypoperfusion time, and PCI treatment were associated factors affecting the prognosis of neurological function in patients, while multivariate analysis showed that hypoperfusion time was independently associated with good neurological function, with an OR (95% CI) of 1.06 (1.00-1.14) and p = .05. Our findings suggested that ECPR failed to significantly improve neurological outcome in patients with refractory OHCA; however, the small sample size in this study may be insufficient to detect clinically relevant differences. In addition, hypoperfusion time may be a key predictive factor in identifying candidates for ECPR.

Abstract 243: Comparing the Effectiveness of Extracorporeal and Conventional Cardiopulmonary Resuscitation for Out-of-Hospital Cardiac Arrest: An Updated Systematic Review and Meta-Analysis

Background: Cardiac arrest is a leading cause of death worldwide, with out-of-hospital cardiac arrest (OHCA) presenting unique challenges in terms of timely and effective treatment. Conventional Cardiopulmonary Resuscitation (CPR) remains the standard intervention; however, the emerging use of Extracorporeal Cardiopulmonary Resuscitation (ECPR) and its potential for superior hemodynamic support necessitates a comprehensive comparison of these interventions in the context of OHCA to guide resuscitation practices. Aim: This study aims to compare ECPR and conventional CPR in patients experiencing OHCA. Methods: We searched several databases, including MEDLINE, EMBASE, and the Cochrane Central Register of Controlled Trials (CENTRAL) until May 2023. Studies that compared ECPR and conventional CPR in OHCA were included in the analysis. The outcomes assessed included in-hospital mortality following admission, return of spontaneous circulation (ROSC), 30-day mortality, and positive neurological recovery at discharge. Data analysis was performed using a random-effects model, with Relative Risk (RR) computed for each outcome. All statistical analyses were performed using R software (version 4.0.3) with metafor and meta packages. Results: We included a total of 5 studies totaling 8,632 patients (4,315 in the ECPR group and 4,317 in the conventional CPR group). The analysis revealed no significant difference between ECPR and conventional CPR in terms of in-hospital mortality (RR 0.95, 95% Confidence Interval (CI) 0.88 to 1.03, P=0.19, I2=60%) and ROSC (RR 1.01, 95% CI 0.97 to 1.05, P=0.58, I2=0%). However, ECPR was associated with a significant reduction in 30-day mortality (RR 0.93, 95% CI 0.91 to 0.95, P&lt;0.01, I2=0%). No significant improvement was found in positive neurological recovery at discharge with ECPR compared to conventional CPR (RR 1.25, 95% CI 0.80 to 1.93, P=0.33, I2=16%). Conclusion: This study highlights the potential of ECPR in reducing 30-day mortality compared to conventional CPR in OHCA cases, although its effectiveness in other outcomes, such as in-hospital mortality and neurological recovery, remains inconclusive. Given the observed heterogeneity among the studies, further high-quality studies are needed.

Early extracorporeal CPR for refractory out-of-hospital cardiac arrest – A pre-planned per-protocol analysis of the INCEPTION-trial

BackgroundEvidence for extracorporeal cardiopulmonary resuscitation (CPR) in refractory out-of-hospital cardiac arrest (OHCA) remains inconclusive. Recently, the INCEPTION-trial, comparing extracorporeal with conventional CPR, found no statistically significant difference in neurologically favorable survival. Since protocol deviations were anticipated, a pre-specified per-protocol analysis was foreseen. MethodsThe per-protocol analysis of the INCEPTION trial excluded patients not meeting inclusion or exclusion criteria, amongst which time-to-cannulation of >60 minutes, and achieving a return of spontaneous circulation before hospital arrival. Crossovers were excluded as well. The primary outcome (30-day survival in a neurologically favorable condition; cerebral performance category [CPC] 1–2) was primarily analyzed under a frequentist statistical framework. In addition, Bayesian analysis under a minimally informative prior was performed. ResultsEighty-one patients were included in the per-protocol analysis (extracorporeal CPR n = 33, conventional CPR n = 48). Thirty-day survival with CPC1-2 was 15% in the extracorporeal CPR group versus 9% in the conventional CPR group (adjusted OR 1.9; 95% CI 0.4–9.3; p-value 0.393). Bayesian analysis showed an 84% posterior probability of any ECPR benefit and a 61% posterior probability of a 5% absolute risk reduction for the primary outcome. ConclusionA pre-planned, pre-specified per-protocol analysis of the INCEPTION-trial, found a higher survival with favorable neurological in patients undergoing ECPR versus CCPR for refractory shockable OHCA. This difference did not reach statistical significance, but results should be interpreted with care, in the light of the small remaining sample size.

Development of an automatic device performing chest compression and external defibrillation: An animal-based pilot study.

Automatic chest compression devices (ACCDs) can promote high-quality cardiopulmonary resuscitation (CPR) and are widely used worldwide. Early application of automated external defibrillators (AEDs) along with high-quality CPR is crucial for favorable outcomes in patients with cardiac arrest. Here, we developed an automated CPR (A-CPR) apparatus that combines ACCD and AED and evaluated its performance in a pilot animal-based study. Eleven pigs (n = 5, A-CPR group; n = 6, ACCD CPR and AED [conventional CPR (C-CPR)] group) were enrolled in this study. After 2 min observation without any treatment following ventricular fibrillation induction, CPR with a 30:2 compression/ventilation ratio was performed for 6 min, mimicking basic life support (BLS). A-CPR or C-CPR was applied immediately after BLS, and resuscitation including chest compression and defibrillation, was performed following a voice prompt from the A-CPR device or AED. Hemodynamic parameters, including aortic pressure, right atrial pressure, coronary perfusion pressure, carotid blood flow, and end-tidal carbon dioxide, were monitored during resuscitation. Time variables, including time to start rhythm analysis, time to charge, time to defibrillate, and time to subsequent chest compression, were also measured. There were no differences in baseline characteristics, except for arterial carbon dioxide pressure (39 in A-CPR vs. 33 in C-CPR, p = 0.034), between the two groups. There were no differences in hemodynamic parameters between the groups. However, time to charge (28.9 ± 5.6 s, A-CPR group; 47.2 ± 12.4 s, C-CPR group), time to defibrillate (29.1 ± 7.2 s, A-CPR group; 50.5 ± 12.3 s, C-CPR group), and time to subsequent chest compression (32.4 ± 6.3 s, A-CPR group; 56.3 ± 10.7 s, C-CPR group) were shorter in the A-CPR group than in the C-CPR group (p = 0.015, 0.034 and 0.02 respectively). A-CPR can provide effective chest compressions and defibrillation, thereby shortening the time required for defibrillation.

EXTRACORPOREAL CARDIOPULMONARY RESUSCITATION WITH THERAPEUTIC HYPOTHERMIA MITIGATES KIDNEY INJURY AFTER CARDIAC ARREST IN RATS.

Many patients with cardiac arrest (CA) experience severe kidney injury after the return of spontaneous circulation. This study aimed to compare the renal protective effect of conventional cardiopulmonary resuscitation (CCPR), extracorporeal cardiopulmonary resuscitation (ECPR), and ECPR with therapeutic hypothermia (ECPR+T) in a CA rat model. Twenty-four adult male Sprague-Dawley rats were randomly and equally allocated into the sham, CCPR, ECPR, and ECPR+T groups. The sham group underwent basic surgical procedures without asphyxia-induced CA. The other three groups were treated with asphyxiation to establish the CA model. Subsequently, they were rescued using three different therapeutic methods. The end points were 1 h after return of spontaneous circulation or death. Renal injury was evaluated by histopathology. Oxidative stress, endoplasmic reticulum stress, necroptosis, inflammatory, and apoptosis-related genes, and proteins were detected using western blotting, ELISA, and assay kit. Compared with CCPR, ECPR and ECPR+T alleviated oxidative stress by upregulating nuclear factor erythroid 2-related factor 2, superoxide dismutase, glutathione and downregulating heme oxygenase-1, and malondialdehyde. Expression of endoplasmic reticulum stress-related proteins, glucose-regulated protein 78, and CCAAT/enhancer-binding protein homologous protein was lower in ECPR and ECPR+T groups than that in the CCPR group, along with levels of TNF-α, IL-6, and IL-β, and necroptosis proteins (receptor-interacting serine/threonine kinases 1 and 3). Furthermore, the ECPR and ECPR+T groups had significantly increased B-cell lymphoma 2 and decreased B-cell lymphoma 2-associated X levels compared with the CCPR group. Extracorporeal cardiopulmonary resuscitation and ECPR+T alleviate kidney damage after CA in rats compared with CCPR. Furthermore, ECPR+T had a better renal protective effect.

Early Extracorporeal CPR for Refractory Out-of-Hospital Cardiac Arrest

BackgroundExtracorporeal cardiopulmonary resuscitation (CPR) restores perfusion and oxygenation in a patient who does not have spontaneous circulation. The evidence with regard to the effect of extracorporeal CPR on survival with a favorable neurologic outcome in refractory out-of-hospital cardiac arrest is inconclusive.MethodsIn this multicenter, randomized, controlled trial conducted in the Netherlands, we assigned patients with an out-of-hospital cardiac arrest to receive extracorporeal CPR or conventional CPR (standard advanced cardiac life support). Eligible patients were between 18 and 70 years of age, had received bystander CPR, had an initial ventricular arrhythmia, and did not have a return of spontaneous circulation within 15 minutes after CPR had been initiated. The primary outcome was survival with a favorable neurologic outcome, defined as a Cerebral Performance Category score of 1 or 2 (range, 1 to 5, with higher scores indicating more severe disability) at 30 days. Analyses were performed on an intention-to-treat basis.ResultsOf the 160 patients who underwent randomization, 70 were assigned to receive extracorporeal CPR and 64 to receive conventional CPR; 26 patients who did not meet the inclusion criteria at hospital admission were excluded. At 30 days, 14 patients (20%) in the extracorporeal-CPR group were alive with a favorable neurologic outcome, as compared with 10 patients (16%) in the conventional-CPR group (odds ratio, 1.4; 95% confidence interval, 0.5 to 3.5; P=0.52). The number of serious adverse events per patient was similar in the two groups.ConclusionsIn patients with refractory out-of-hospital cardiac arrest, extracorporeal CPR and conventional CPR had similar effects on survival with a favorable neurologic outcome. (Funded by the Netherlands Organization for Health Research and Development and Maquet Cardiopulmonary [Getinge]; INCEPTION ClinicalTrials.gov number, NCT03101787.)

Abstract 271: The Time Dependence Of The Effect Of Extracorporeal Cpr For Out-of-hospital Cardiac Arrest Patients

Background: Extracorporeal cardiopulmonary resuscitation (ECPR) has been considered as a rescue therapy for refractory cardiac arrest patients. However, little is known about who is refractory to conventional CPR and when to judge the initiation of ECPR. Method: We performed a secondary analysis of the nationwide hospital-based prospective observational study (The JAAM-OHCA registry) in Japan. This study included adult OHCA patients aged ≥18 years who had an initial shockable rhythm between June, 2014 and December, 2019. We classified the included patients into the ECPR group or the conventional CPR group based on whether to receive ECPR or not. Low flow duration (LFD) was defined as the time from call to the initiation of ECPR or to the time of return of spontaneous circulation or termination of resuscitation. The primary outcome was 1-month survival with favorable neurological outcomes defined by cerebral performance category 1 or 2. We visually described the nonlinear relationship between LFD and the predictive probability of favorable neurological outcome using a restricted cubic spline by each group. Results: Of 57,754 patients registered in the JAAM-OHCA registry, 3807 patients were included in analyses (ECPR group, n = 865 and Conventional CPR group, n = 2942). In both groups, shorter LFD was associated with favorable neurological outcome. For first 30 minutes, the overall proportion of favorable neurological was higher in the Conventional CPR group, but due to the rapid decrease in Conventional CPR, it dropped down to almost the same probability before 20 min as that of shortest LFD around 25 min in the ECPR group. After that, the probability of favorable neurological outcome was constantly higher in the ECPR group. Conclusion: The judgement of refractory cardiac arrests and decision for ECPR should be delivered before 20 min from call to maximize the probability of favorable neurological outcome for those with an initial shockable rhythm.

Abstract 280: Extracorporeal Cardiopulmonary Resuscitation Outcomes In Children Without Underlying Cardiac Disease

Introduction: Extracorporeal cardiopulmonary resuscitation (ECPR) has been associated with improved outcomes compared to conventional CPR (CCPR) in children with underlying cardiac disease. There are limited data on ECPR survival outcomes in the non-cardiac population. Hypothesis: ECPR will be associated with improved survival to discharge in children without underlying cardiac disease with prolonged CPR. Methods: Retrospective cohort study using the AHA Get With The Guidelines® - Resuscitation registry of children (&lt;18 years) without cardiac disease who received ≥30 minutes of CPR for in-hospital cardiac arrest between 2000-2020. Weighted propensity scores were used to balance ECPR and CCPR groups based on hospital and patient characteristics. Multivariable logistic regression incorporating these scores tested the association of ECPR with survival to discharge. A Bayesian logistic regression model was used to estimate the probability of a positive effect from ECPR. A secondary analysis explored temporal trends in ECPR relative to the index year of 2000. Results: Of 875 patients, 159 received ECPR and 716 received CCPR (median age 1 year, primary diagnosis respiratory insufficiency, median CPR duration 45 minutes for full cohort). Survival to discharge was similar between the ECPR group (21.4%) compared to the CCPR group (16.2%) in both the univariable analysis (p= 0.13) and the propensity-weighted multivariable logistic regression (aOR 1.44 [CI 0.85-2.44, p= 0.173]. The Bayesian model estimated an 85.1% probability of a positive effect of ECPR on survival to discharge. ECPR use increased over time (test for trend p&lt;0.001). Conclusion: In children without cardiac disease who required ≥30 minutes of CPR, ECPR usage significantly increased in the last 20 years. Compared to CCPR, ECPR was not associated with a statistically significant increase in survival to discharge. However, a Bayesian model estimated weak evidence of a positive survival effect of ECPR.

Neurological intact survival with rescue mechanical circulatory support for refractory out-of-hospital cardiac arrest despite long low-flow times

Abstract Funding Acknowledgements Type of funding sources: None. Background The potential window for using mechanical circulatory support (MCS) for refractory out-of-hospital cardiac arrest (OHCA) remain unsettled. It has been proposed that a cut-off limit defined as the golden hour may produce higher survival with good neurological outcome. Purpose The present study analyzed the association of low-flow time and neurological intact survival (Cerebral Performance Categories 1-2) at discharge between patients receiving conventional cardiopulmonary resuscitation (CCPR) and MCS. Methods The present retrospective, observational, single centre study from 2015-2019 included all consecutive OHCA patients, who were treated with MCS for refractory OHCA or received CCPR. Low-flow time was defined as the time from CPR to deployment of either veno-arterial extracorporeal membrane oxygenation or Impella support for the MCS group. Time from CPR to return of spontaneous circulation or termination of treatment was recorded for the CCPR group. Rate of neurological intact survival at discharge were analyzed for both groups. Results A total of 101 patients were treated with MCS and 914 patients received CCPR. The MCS group was significantly younger with a median age of 56 (IQR, 46-62) years compared to 67 (IQR, 57-74) years, p &amp;lt; 0.001. In the CCPR group, short low-flow times (0-20 minutes) were associated with high survival with good neurological outcome at discharge. There were no survivors with low-flow times exceeding 70 minutes. All patients receiving MCS survived at low-flow times 31-60 minutes, however neurological intact survival dropped to 21% at low-flow times &amp;gt; 80 minutes. Conclusion Patients treated with MCS with low-flow time 70-80 minutes did show similar favorable neurological outcome at discharge as patients receiving CCPR with low-flow &amp;lt; 10 minutes. Despite, low-flow times exceeding 80 minutes, patients treated with MCS still presented high survival rate of 21%. Hence, the data in this study does not support a golden hour for MCS.

The Effects of Extracorporeal Cardiopulmonary Resuscitation According to Covariate Adjustment.

This study compared the effects of extracorporeal cardiopulmonary resuscitation (ECPR) using propensity-score matching (PSM) analyses. A nationwide registry of out-of-hospital cardiac arrest (OHCA) patients in Korea between 2013 and 2016 was used. Patients with OHCA aged ≥15 years with cardiac etiology and resuscitation time >30 minutes were enrolled. Resuscitation-related variables before the initiation of ECPR were included. Two PSM analyses were performed separately, with and without post-ECPR variables. The primary outcome (PO) was a favorable neurologic outcome at hospital discharge. The rate of PO was 8.1% (13/161) in the ECPR group and 1.5% (247/16,489) in the conventional CPR (CCPR) group. In the matched cohort with post-ECPR variables, there was no significant difference in the rate of PO between the ECPR and CCPR groups (7.9% vs. 7.9%; p = 0.982). In the matched cohort without post-ECPR variables, the rate of PO was higher in the ECPR group than that in the CCPR group (8.3% vs. 3.6%; p = 0.012). PSM analysis without post-ECPR variables compared outcomes of all patients experiencing OHCA and treated with ECPR versus CCPR, which showed better neurologic outcomes for ECPR. PSM analysis with post-ECPR variables compared outcomes between ECPR survivors and CCPR survivors, which exhibited similar neurologic outcomes.

Extracorporeal Life-support for Out-of-hospital Cardiac Arrest: A Nationwide Multicenter Study.

Despite potential clinical roles of extracorporeal life support (ECLS) for out-of-hospital cardiac arrest (OHCA) compared to that of conventional cardiopulmonary resuscitation (CCPR), use of ECLS for OHCA is not strongly endorsed by current clinical guidelines. The purpose of this study is to investigate the clinical roles of extracorporeal life support (ECLS) compared with that of conventional cardiopulmonary resuscitation (CCPR) for out-of-hospital cardiac arrest (OHCA) patients. The outcomes of OHCA between 2015 and 2020, enrolled in the Korean Cardiac Arrest Research Consortium (KoCARC), a multicenter OHCA patient registry including 65 participating hospitals throughout the Republic of Korea (ClinicalTrials.gov, number NCT03222999). Differences in clinical features were adjusted by matching the propensity for ECLS. The primary outcome was 30-day neurologically favorable survival with cerebral performance category of 1 or 2. Restricted mean survival time (RMST) was used to compare outcomes between groups. Of 12,006 patients included, ECLS was applied to 272 patients (2.2%). The frequency of neurologically favorable survival was higher in the ECLS group than the CCPR group (RMST difference, 5.5 days [95% CI, 4.1-7.0 days], P < 0.001). In propensity score-matched 271 pairs, the clinical outcome of ECLS and CCPR did not differ to a statistically significant extent (RMST difference, 0.4 days [95% CI -1.6 to 2.5 days], P = 0.67). Subgroup analyses revealed that the clinical roles of ECLS was evident in patients with nonshockable rhythm or CPR time ≥20 min (RMST difference, 2.7 days [95% CI 0.5-4.8 days], P = 0.015), but not in patients without these features (RMST difference, -3.7 days [95% CI -7.6 to 0.2 days], P = 0.07). In this real-world data analysis, ECLS compared to CCPR did not result in better overall clinical outcomes of OHCA. The clinical efficacy of ECLS may be limited to a subgroup of high-risk patients.

Abstract 9588: Higher Survival With the Use of Extracorporeal Cardiopulmonary Resuscitation Compared With Conventional Cardiopulmonary Resuscitation in Children Undergoing Cardiac Surgery: Analysis of the Get With the Guidelines Registry©

Introduction: Extracorporeal cardiopulmonary resuscitation (E-CPR) has been increasingly utilized during in-hospital arrest in postoperative pediatric cardiac surgical patients. Despite this and the significant associated mortality, few pediatric multicenter analyses have evaluated if E-CPR increases survival for in-hospital cardiac arrest compared with conventional cardiopulmonary resuscitation (C-CPR). Methods: Children &lt;18 years in the Get with the Guidelines-Resuscitation Registry© suffering in-hospital cardiac arrest following cardiac surgery who received ≥10 minutes of CPR between January 2008 and December 2020 were included. We compared patient factors, pre-arrest comorbid conditions, and survival to hospital discharge for E-CPR and C-CPR groups. Results: Among 1219 patients from 56 institutions, 483 patients (39.6%) received E-CPR. Nearly 75% (910/1219) of patients were &lt;1 year of age with 39% (477/1219) under 1 month. Older patients were more likely to receive E-CPR (p=0.004). E-CPR utilization increased over the study period (p&lt;0.001). Non-Hispanic White patients accounted for almost half of the population (575/1219) and were also more likely to receive E-CPR (p=0.044) compared to other races/ethnicities. Patients with cyanotic cardiac malformations (p=0.005), congestive heart failure prior to admission (p=0.007), and hypotension prior to arrest (p=0.014) were also more likely to receive E-CPR. Unadjusted survival of the index CPR event (98% vs. 63%, p&lt;0.001) and to hospital discharge (47% vs 39%, p=0.007) were both higher in the E-CPR compared to C-CPR group. Conclusions: In a large, multicenter study of pediatric cardiac surgical patients suffering in-hospital arrest, we found that E-CPR is commonly used and had significantly higher survival to hospital discharge compared with C-CPR. E-CPR is an important rescue strategy for children with heart disease and centers performing cardiac surgery should develop E-CPR programs.

Dispatcher-assisted conventional cardiopulmonary resuscitation and outcomes for paediatric out-of-hospital cardiac arrests

AimAs asphyxial cardiac arrest is more common than cardiac arrest from a primary cardiac event in paediatric cardiac arrest, effective ventilation is important during paediatric cardiopulmonary resuscitation (CPR). We aimed to determine optimal dispatcher-assisted CPR instructions for bystanders after paediatric out-of-hospital cardiac arrest (OHCA). MethodsWe analysed the records of 8172 children who received bystander dispatcher-assisted CPR. Data were obtained from an All-Japan Utstein-style registry from 2005 to 2017. Patients were divided into conventional CPR and compression-only CPR groups. The primary study endpoint was 1-month neurologically intact survival, defined as a Cerebral Performance Category score of 1 or 2 (CPC 1–2). ResultsThe 1-month CPC 1–2 rate was significantly higher in the dispatcher-assisted conventional CPR group than in the dispatcher-assisted compression-only CPR group (before propensity score matching, 5.7% [175/3077] vs. 3.1% [160/5095], p < 0.0001, adjusted odds ratio 2.48, 95% confidence interval 1.19–3.22; after propensity score matching, 6.0% [156/2618] vs. 2.6% [69/2618], p < 0.0001, adjusted odds ratio 2.42, 95% confidence interval 1.76–3.32). In most subgroup analyses after matching, dispatcher-assisted conventional CPR had a higher CPC 1–2 rate than dispatcher-assisted compression-only CPR; however, CPC 1–2 rates were similar between the two groups for patients with an initial shockable rhythm, those with total prehospital CPR time ≥ 20 min, those receiving public access defibrillation, advanced airway management, or adrenaline administration. ConclusionWithin the limitations of this retrospective observational study, dispatcher-assisted conventional CPR was preferable to dispatcher-assisted compression-only CPR as optimal CPR instructions for coaching callers to perform bystander CPR.

Comparison of Long-Term Effects between Chest Compression-Only CPR Training and Conventional CPR Training on CPR Skills among Police Officers.

Despite of the changes of out-of-hospital cardiac arrest (OHCA) survival rise when bystander CPR is provided, this was only conducted in about 23% of OHCA patients in Korea in 2018. Police officers acting as first responders have a high chance of witnessing situations requiring CPR. We investigated long-term effects on CPR quality between chest compression-only CPR training and conventional CPR training in police officers to find an efficient CPR training method in a prospective, randomized, controlled trial. Police officers underwent randomization and received different CPR training. With the Brayden Pro application, we compared the accuracy of CPR skills immediately after training and the one after 3 months. Right after training, the conventional CPR group presented the accuracy of the CPR skills (compression rate: 74.6%, compression depth: 66.0%, recoil: 78.0%, compression position: 96.1%) and chest compression-only CPR group presented the accuracy of the CPR skills (compression rate: 74.5%, compression depth: 71.6%, recoil: 79.2%, compression position: 99.0%). Overall, both groups showed the good quality of CPR skills and had no meaningful difference right after the training. However, three months after training, overall accuracy of CPR skills decreased, a significant difference between two groups was observed for compression position (conventional CPR: 80.0%, chest compression only CPR: 95.0%). In multiple linear regression analysis, three months after CPR training, chest compression-only CPR training made CPR skills accuracy 28.5% higher. In conclusion, police officers showed good-quality CPR right after CPR training in both groups. But three months later, chest compression-only CPR training group had better retention of CPR skills. Therefore, chest compression-only CPR training is better to be a standard training method for police officers as first responders.

Protective effect of extracorporeal membrane pulmonary oxygenation combined with cardiopulmonary resuscitation on post-resuscitation lung injury.

Cardiac arrest (CA) is a critical condition that is a concern to healthcare workers. Comparative studies on extracorporeal cardiopulmonary resuscitation (ECPR) and conventional cardiopulmonary resuscitation (CCPR) technologies have shown that ECPR is superior to CCPR. However, there is a lack of studies that compare the protective effects of these two resuscitative methods on organs. Therefore, we aim to perform experiments in swine models of ventricular fibrillation-induced CA to study whether the early application of ECPR has advantages over CCPR in the lung injury and to explore the protective mechanism of ECPR on the post-resuscitation pulmonary injury. Sixteen male swine were randomized to CCPR (CCPR; n=8; CCPR alone) and ECPR (ECPR; n=8; extracorporeal membrane oxygenation with CCPR) groups, with the restoration of spontaneous circulation at 6 hours as an endpoint. For the two groups, the survival rates between the two groups were not statistically significant (P>0.05), the blood and lung biomarkers were statistically significant (P<0.05), and the extravascular lung water and pulmonary vascular permeability index were statistically significant (P<0.01). Compared with the ECPR group, electron microscopy revealed mostly vacuolated intracellular alveolar type II lamellar bodies and a fuzzy lamellar structure with widening and blurring of the blood-gas barrier in the CCPR group. ECPR may have pulmonary protective effects, possibly related to the regulation of alveolar surface-active proteins and mitigated oxidative stress response post-resuscitation.

Abstract 101: Effect of Extracorporeal Membrane Oxygenation for Accidental Hypothermia With Absent Vital Signs: A Nationwide Observational Study

Introduction: Patients with accidental hypothermia and absent vital signs are increasingly receiving venoarterial extracorporeal membrane oxygenation (VA-ECMO). However, there is limited knowledge on the efficacy of this advanced rewarming method. Despite the limited evidence, the resuscitation guidelines from the European Resuscitation Council and the American Heart Association both recommended the use of extracorporeal life support in patients with accidental hypothermia and absent vital signs. Hypothesis: We hypothesized that VA-ECMO is associated with lower in-hospital mortality compared with cardiopulmonary resuscitation (CPR) only in patients with accidental hypothermia and absent vital signs. Methods: Using the Japanese Diagnosis Procedure Combination inpatient database from July 2010 to March 2017, we identified patients diagnosed with accidental hypothermia (International Classification of Diseases Tenth Revision code T68) who received closed-chest cardiac massage in hospital on admission day. Patients who received VA-ECMO on admission day were allocated to the VA-ECMO group, and those who received CPR only were allocated to the conventional CPR group. The primary outcome was in-hospital mortality. The secondary outcome was alert consciousness for Japan Coma Scale status at discharge. Propensity score analyses were performed to compare the outcomes between the two groups. Results: We identified 1,624 eligible patients during the 81-month study period. Of these, 19% (314 of 1,624) received VA-ECMO on admission day. Crude in-hospital mortality was 65.3% (205 of 314) and 84.1% (1,102 of 1,310) in the VA-ECMO and conventional CPR groups, respectively. Propensity score-matching analyses demonstrated significantly lower in-hospital mortality (risk difference, –14.1%; 95% confidence interval, –21.9% to –6.3%) and higher proportion of alert consciousness at discharge (risk difference, 8.5%; 95% confidence interval, 2.1% to 15.0%) in the VA-ECMO group compared with the conventional CPR group. Conclusions: VA-ECMO was significantly associated with decreased in-hospital mortality and favorable neurologic outcome compared with conventional CPR in patients with accidental hypothermia and absent vital signs.

Bystander-initiated conventional vs compression-only cardiopulmonary resuscitation and outcomes after out-of-hospital cardiac arrest due to drowning

BackgroundGreat emphasis has been placed on rescue breathing in out-of-hospital cardiac arrest (OHCA) due to drowning. However, there is no evidence about the effect of rescue breathing on neurologically favorable survival after OHCA due to drowning. The aim of this study is to examine the effect of bystander-initiated conventional (with rescue breathing) versus compression-only (without rescue breathing) cardiopulmonary resuscitation (CPR) in OHCA due to drowning. MethodsThis nationwide population-based observational study using prospectively collected government-led registry data included patients with OHCA due to drowning who were transported to an emergency hospital in Japan between 2013 and 2016. The primary outcome was one-month neurologically favorable survival. ResultsThe full cohort (n = 5121) comprised 2486 (48.5%) male patients, and the mean age was 72.4 years (standard deviation, 21.6). Of these, 968 (18.9%) received conventional CPR, and 4153 (81.1%) received compression-only CPR. 928 patients receiving conventional CPR were propensity-matched with 928 patients receiving compression-only CPR. In the propensity score-matched cohort, one-month neurologically favorable survival was not significantly different between the two groups (7.5% in the conventional CPR group vs. 6.6% in the compression-only CPR group; risk ratio, 1.15; 95% confidence interval, 0.82–1.60; P = 0.4147). This association was consistent across a variety of subgroup analyses. ConclusionsAmong patients with OHCA due to drowning, there were no differences in one-month neurologically favorable survival between bystander-initiated conventional and compression-only CPR groups, although several important data (e.g., water temperature, submersion duration, or body of water) could not be addressed. Further study is warranted to confirm our findings.