Favorable Neurological Outcome Research Articles

Abstract 186: Regional Cerebral Oxygen Saturation to Predict Neurologic Outcome During Out-of-Hospital-Cardiac -Arrest: An Ancillary Analysis of a Prospective Interventional Study

Background: Very few prognosis markers are available to help emergency medical services decide whether to continue or terminate cardiopulmonary resuscitation (CPR). ETCO 2 has been described to predict return of spontaneous circulation (ROSC) but its ability to predict neurologic outcome is poor. Cerebral tissue oxygen saturation (RSO 2 ) during CPR, as measured by near-infrared spectroscopy (NIRS) represents hemoglobin oxygenation within the cerebral tissue. The measure is feasible during CPR. It has been associated with the probability of ROSC. The aim of this study was to assess the predictive value of RSO2 regarding 30 days favorable neurologic outcome after out-of-hospital cardiac arrest (OHCA). Method: Data were collected during a prospective single center before-after interventional study comparing conventional CPR (C-CPR) with Automated head and thorax elevation CPR (AHUP). C-CPR was performed manually and AHUP-CPR was delivered using a LUCAS Active Decompression (Stryker Medical, USA), an EleGARD Patient Positioning System (AdvancedCPR Solutions, USA), and an impedance threshold device (ResQPOD-16, Zoll, USA). The study was carried out in four fire stations and one physician staffed advanced life support emergency medical services in France. ETCO2 (using an EMMA, Massimo or Lifepack 15, Stryker, USA) and RSO2 (H500, Nonin, USA) were collected as soon as possible during CPR. Favorable neurologic outcome was defined as MRS score of 0 to 3 at 30 days. Results are presented as mean ± standard deviation. Results: ETCO 2 was collected in 118 patients (11 with good neurologic outcome) and RSO 2 in 69 patients (6 with good neurologic outcome). Maximum ETCO 2 during CPR was 43±19mmHg in favorable neurologic outcome patients vs. 35±16mmHg (p=0.13). ETCO 2 alone had an AUC of 0,63 (IC95% 0.46-0.79). Maximum RSO2 during CPR was 68±13% for favorable neurologic outcome patients vs. 49±13% (p<0.001). For survival with favorable neurologic outcome, rSO 2 alone had an AUC of 0.85 (IC95% 0.71-0.99). With a maximum RSO 2 value below 51% there was no patient with favorable neurologic outcome. Conclusion: In this prospective interventional study, unlike EtCO 2 , RSO 2 values were significantly associated with favorable neurological survival at 30 days.

Abstract 390: Pre-Hospital Administered Adrenaline in the Presence of a Physician and Neurological Status of Patients With Out-of-Hospital Cardiac Arrest: A Multi-Center Prospective Cohort Study

Background: Little is known about whether pre-hospital administered adrenaline with a physician present could improve the outcome of patients with cardiac arrest. Hypothesis and Aim: We aimed to test the hypothesis that pre-hospital administered adrenaline provided in the presence of a physician could improve neurological survival of patients with a specific type of first-confirmed cardiac rhythm following cardiac arrest compared with pre-hospital administered adrenaline provided in the absence of a physician. Methods: This prospective multi-center cohort study enrolled consecutive patients who were transported to 95 participating hospitals in Japan after out-of-hospital cardiac arrest and later underwent resuscitation at a hospital between June 1 2014 and December 31 2020. We included patients who were administered pre-hospital adrenaline under the presence or absence of a physician, and who were ≥18 years of age with cardiac arrest of a medical etiology. Primary outcome was a favorable neurological outcome (Cerebral Performance Category score of 1 or 2) one month after cardiac arrest. Whether the carotid artery was pulsating and 3-lead electrocardiogram monitor confirmed the first cardiac rhythm. Based on previous findings, those with the first-confirmed cardiac rhythm were subdivided into the non-shockable and shockable groups. Multivariable logistic regression analysis was performed on propensity score-matched patients. Results: We analyzed 11,711 patients. Among the 10,113 patients in the non-shockable group, 0.6% (N = 64) had a favorable neurological outcome. The adjusted odds ratio for a favorable neurologic outcome of pre-hospital administered adrenaline under the presence of a physician was 3.94 (95% confidence interval (CI): 1.58-11.4), compared with the absence of a physician. Of 1,598 patients in the shockable group, 10.3% (N = 164) had a favorable neurological outcome with an adjusted odds ratio of 1.30 (95% CI: 0.73-2.35). Conclusion: This prospective multi-center cohort study showed that pre-hospital administered adrenaline in the presence of a physician was significantly associated with a higher favorable neurological outcome in non-shockable patients with cardiac arrest.

Abstract 417: Advanced vs. Basic Life Support Outcome Variation in the Treatment of Out-of-Hospital-Cardiac-Arrest in Detroit

Background: Out-of-Hospital-Cardiac-Arrest (OHCA) may be treated with Advanced Life Support (ALS) and Basic Life Support (BLS). Previous literature has indicated that ALS provides no additional benefit to OHCA patients. This study compared OHCA outcomes between prehospital ALS or BLS care in a city with a preponderance of BLS only care. Study Objectives: To test for associations between prehospital ALS or BLS care stratified by initial cardiac rhythm on ROSC, discharged alive from the hospital, and on favorable neurological outcome at hospital discharge in OHCA of a presumed cardiac origin. Methods: A retrospective cohort of 6746 patients with non-traumatic OHCA who received CPR from a transporting EMS agency was collected using the Cardiac Arrest Registry to Enhance Survival (CARES) database. Patients were sorted into 4 cohorts based on ALS vs BLS care and initial shockable vs non-shockable cardiac rhythms. Cohorts were compared utilizing chi-squared and multivariable logistic regression analysis against the outcome variables of sustained ROSC, discharged alive from the hospital, and a favorable neurological outcome at hospital discharge. Results: After controlling for covariates, the odds of sustained ROSC were statistically significantly higher for S-ALS vs. NS-BLS (OR=4.4, p.001), S-BLS vs. NS-BLS (OR=1.8, p.001), and NS-ALS vs. NS-BLS (OR=2.2, p.001). The association between cohort and discharged alive from the hospital was also statistically significant (p.001), and discharged alive rates were S-ALS (17.9%); S-BLS (11.8%); NS-ALS (3.7%); NS-BLS (4.0%). The association between cohort and favorable neurological outcome was also statistically significant (p.001), and outcome rates were S-ALS (74.6%); S-BLS (58.2%); NS-ALS (36.5%); NS-BLS (41.6%). The odds of favorable neurological outcome were higher for S-ALS vs. NS-BLS (OR=2.6, p.001). Conclusion: In contrast to previous literature, ALS care in the study was superior to BLS care. ALS care was associated with higher rates of ROSC in OHCA patients regardless of rhythm. Further, ALS care was associated with higher rates of being discharged alive from the hospital and favorable neurological outcomes among patients with a shockable rhythm.

How effective is extracorporeal life support for patients with out-of-hospital cardiac arrest initiated at the emergency department? A systematic review and meta-analysis.

Extracorporeal cardiopulmonary resuscitation (ECPR) is commonly initiated for adults experiencing cardiac arrest within the cardiac catheterization lab or the intensive care unit. However, the potential benefit of ECPR for these patients in the emergency department (ED) remains undocumented. This study aims to assess the benefit of ECPR initiated in the ED for patients with out-of-hospital cardiac arrest (OHCA). We conducted a systematic review and meta-analysis of studies comparing ECPR initiated in the ED versus conventional CPR. Relevant articles were identified by searching several databases including PubMed, EMBASE, Web of Science, and Cochrane collaborations up to July 31, 2022. Pooled estimates were calculated using the inverse variance heterogeneity method, while heterogeneity was evaluated using Q and I2 statistics. The risk of bias in included studies was evaluated using validated bias assessment tools. The primary outcome was a favorable neurological outcome at hospital discharge, and the secondary outcome was survival to hospital discharge or 30-day survival. Sensitivity analyses were performed to explore the benefits of ED-initiated ECPR in studies utilizing propensity score (PPS) analysis. Publication bias was assessed using Doi plots and the Luis Furuya-Kanamori (LFK) index. The meta-analysis included a total of eight studies comprising 51,173 patients. ED-initiated ECPR may not be associated with a significant increase in favorable neurological outcomes (odds ratio [OR] 1.43, 95% confidence interval [CI] 0.30-6.70, I2 = 96%). However, this intervention may be linked to improved survival to hospital discharge (OR 3.34, 95% CI 2.23-5.01, I2 = 17%). Notably, when analyzing only PPS data, ED-initiated ECPR demonstrated efficacy for both favorable neurological outcomes (OR 1.89, 95% CI 1.26-2.83, I2 = 21%) and survival to hospital discharge (OR 3.37, 95% CI 1.52-7.49, I2 = 57%). Publication bias was detected for primary (LFK index 2.50) and secondary (LFK index 2.14) outcomes. The results of this study indicate that ED-initiated ECPR may not offer significant benefits in terms of favorable neurological outcomes for OHCA patients. However, it may be associated with increased survival to hospital discharge. Future studies should prioritize randomized trials with larger sample sizes and strive for homogeneity in patient populations to obtain more robust evidence in this area.

Abstract 391: Association Between Defibrillation to Epinephrine Interval and Short-Term Outcomes in Out-of-Hospital Cardiac Arrest Patients With Shockable Rhythm

Background: The optimal timing of epinephrine administration after defibrillation in out-of-hospital cardiac arrest (OHCA) patients with shockable rhythm is unknown. Aim: We evaluated the association between defibrillation to epinephrine interval and short-term outcomes. Methods: Between 2011 and 2020, we enrolled 1,259,960 OHCA patients from a nationwide prospective population-based registry in Japan. After applying exclusion criteria, 20,905 patients with shockable rhythm as the first documented rhythm at emergency medical services (EMS) arrival who received epinephrine after defibrillation were eligible for the study. Clinical outcomes included prehospital return of spontaneous circulation (ROSC), survival, and favorable neurological outcome at 30 days. To examine whether each variable predicted a good short-term outcome, multivariable logistic regression models were constructed using age, gender, year, district, origin of cardiac arrest, witnessed arrest, bystander-initiated cardiopulmonary resuscitation, call to EMS arrival interval, EMS arrival to defibrillation interval, and defibrillation to epinephrine interval. Results: At 30 days, 1,618 patients (8%) had a favorable neurological outcome. The defibrillation to epinephrine interval in these patients was significantly shorter than the interval in patients with an unfavorable neurological outcome [8 (5-12) vs 11 (7-16) min; P<0.001]. The proportion of patients who achieved prehospital ROSC, survived, or had a favorable neurological outcome at 30 days decreased as time to epinephrine after defibrillation increased (P<0.001 for trend). Multivariable analysis showed that shorter defibrillation to epinephrine interval independently predicted good outcomes ( Table ). Conclusion: A shorter defibrillation to epinephrine interval is significantly associated with good short-term outcomes in OHCA patients with shockable rhythm.

Abstract 254: Patients With Signs of Life on Hospital Arrival Have a Higher Chance of Survival and Favorable Neurological Outcomes Following Traumatic Cardiac Arrest

Introduction: The clinical impact of signs of life (SOL) in traumatic cardiac arrest (TCA) remain to be elucidated. A previous study compared TCA patients with pulseless electrical activity (PEA) to those with asystole, but survival was not significantly different between the groups. Other obvious SOL (i.e., fine extremity/eye movement, light reflection, agonal respiration) have not yet been examined in TCA. Hypothesis: We hypothesized that TCA patients with SOL on hospital arrival have a higher chance of survival and good neurological outcomes. Aim: To examine survival and neurological outcomes in TCA patients with or without SOL. Methods: Retrospective review of data from the Japan Trauma Data Bank (2019-2021). The inclusion criteria were patients with TCA on arrival. The exclusion criteria were patients with burns, abbreviated injury scale score> 6 in any region, and missing survival or SOL data. SOL was defined as follows: extremity or eye movement, light reflex, gasping, pulseless electrical activity with electrical heart activity > 40 beats per minute. The primary outcome was survival at discharge. The secondary outcome was favorable neurological outcome (Glasgow Outcome Scale score of 4 or 5) at hospital discharge. Patients with and without SOL were compared using univariable analysis. Results were described with odds ratio (ORs) and 95% confidence intervals (CI). Results: A total of 2,136 patients (121 with SOL and 2,015 without SOL) were included. The characteristics of patients with or without SOL were as follows: age (median age 60.5 years old [interquartile range: 42-80 years] vs. 55.2 [38-75]), gender (male: 83/121 (68.6%) vs. 1,321/2,015 (65.9%), Injury Severity Score (32.9 [22-43] vs. 33.7 [22-41]), blunt trauma (97/121 (82.2%) vs. 1,711/2,015 (84.9%)), and transportation time (15.1 min [7-18] vs. 13.3 [7-16]). The patients with SOL showed higher survival compared with the patients without SOL (11/121 (8.5%) vs. 24/2015 (1.2%), OR 1.9 [CI 1.38-2.85]). A similar trend was observed for favorable neurological outcomes (5/95 (5.3%) vs. 7/1,440 (0.5%), OR 2.41 [CI 1.26-3.60]). Conclusions: TCA patients with SOL at arrival showed higher survival and favorable neurological outcomes at hospital discharge compared with TCA patients without SOL.

Abstract 266: Texas Out of Hospital Cardiac Arrest Gender Disparities From Statewide Out-of-Hospital Cardiac Arrest Data Registry - The Texas Cares Project

Introduction: Female out-of-hospital cardiac arrest (OHCA) victims experience differences in care and worse rates of survival compared to male victims. Gender differences in time spent by prehospital care teams on scene with patients has not been studied. Hypothesis: There are gender disparities in scene time and outcomes. Increased scene time is associated with worse outcomes for Males and Females. Methods: We performed a retrospective, cohort study of the Texas Cardiac Arrest Registry to Enhance Survival (CARES) from 2014-201. We included adult OHCAs not witnessed by prehospital personnel that included scene time data and did not result in return of spontaneous circulation in the field that were transferred to emergency departments for ongoing resuscitation. We described OHCA demographics. We evaluated the association between gender and scene time. Using multivariable logistic regression, we evaluated the association of scene time with favorable neurologic outcome, (cerebral performance category (CPC) of 1 or 2). Results: We include 11,782 encounters with OHCA not witnessed by prehospital personnel, of these 7,185 were male and 4,597 female. Female OHCAs were older than male (mean 63.7 vs 61.3, p < 0.01). Female patients had slightly longer scene times than males (mean 29.2 vs 27.9). Female patients were less likely to have favorable neurologic outcomes (12.5% women vs 17.3% men, p < 0.01 by chi2). Adjusting for age, gender, race, initial rhythm and bystander CPR in the multivariable model, increased scene time remained associated with a lower odds of favorable neurologic outcome (OR 0.96, 95%CI 0.95-0.96). Conclusions: OHCAs with longer duration scene time were associated with a lower likelihood of favorable neurologic outcome. Female patients were likely to have longer scene time duration and worse rate of favorable neurologic outcome.

Abstract 236: Agency Factors Associated With First Response Systems That Improve Out-of-Hospital Cardiac Arrest Outcomes

Background: Data are conflicting regarding the association between first responder (FR) cardiopulmonary resuscitation (CPR) and automated external defibrillator (AED) with improved outcomes after out-of-hospital cardiac arrest (OHCA). Additionally, little is known about why this association varies between EMS agencies, with FR interventions being associated with better survival for only some agencies. Hypothesis: Agency characteristic differ between agencies that do a do not successfully implement FR CPR/AED for OHCA. Methods: We studied the 2016-2021 national cardiac arrest registry to enhance survival (CARES) database. We defined the exposures as FR CPR and FR AED. The outcome was survival with favorable neurologic status. We used logistic regression models to evaluate the association between FR CPR/AED and OHCA outcome for each individual agency. Based on each agency’s association between FR AED/CPR and outcomes, we stratified agencies into positive association (95% confidence interval falling entirely above 1) and no association (95% confidence below or including 1). Agencies with poor model fit were excluded. We then compared characteristics between strata. Results: For the association between FR CPR and outcomes, 21 agencies caring for 42,856 patients had a positive association; 371 agencies caring for 449,824 OHCAs had no association. For FR AED, 47 agencies caring for 103,120 OHCAs had a positive association;262 agencies caring for 327,761 OHCAs had no association. For FR CPR and compared to the no association strata, agencies with a positive association had more annual OHCAs (+300), a lower rate of FR CPR (-11.3%), and a lower rate of FR AED (-10.8%). For FR AED and compared to the no association strata, agencies with a positive association FR AED and outcomes had more OHCAs per year (+150.5), a lower rate of FR CPR (-6.8%), a lower rate of FR AED (-13.3%), lower response times (-0.6 minutes), and more OHCAs from high-income neighborhoods (+3.7%). Conclusion: More agencies had a positive association between FR AED and survival with favorable neurologic outcome than between FR CPR and survival with favorable neurologic outcome. Agencies with better outcomes from FR interventions treated more OHCAs and had lower rates of FR intervention.

Abstract 159: Long-Term Survival and Neurological Follow-Up of Cardiac Arrest Survivors: Results From the French Multicentric Prospective Cohort the DESAC Study

Background: While short-term prognosis of cardiac arrest (CA) patients has been extensively studied, less is known regarding the mid- and long-term outcome of survivors. Aims: The aim of the DESAC study was to describe mid- and long-term survival and neurological status of CA survivors, and to assess the influence of pre- and intra-hospital therapeutic strategies on these outcomes. Methods: Between Jul 2015 and Oct 2018, patients over 18 years who were discharged alive from intensive care units in Paris and suburbs (France) after a non-traumatic CA were included and interviewed every 6 months during at least 24 months and up to 48 months in this multicentric study. Factors associated with Cerebral Performance Category (CPC) scale at 24 months were assessed with logistic regression, with CPC 1 or 2 level considered as a favorable neurological outcome. Trajectories of CPC were derived by mixed linear model in survivors with at least 3 evaluations. Results: Out of 593 survivors, 525 had a 24 months follow-up (mean age 57.6 +/-15.3, 79% men). CA occurred in public location in 251/525, with an initial shockable rhythm in 392/525. Prognostic factors independently associated with a favorable neurological outcome at 24 months were initial shockable rhythm (OR= 3.53 (1.65; 7.58)) and previous practice of sport (OR= 3.12 (1.20 ; 8.11)), whereas older age (OR per 10 years= 0.52 (0.40; 0.68)) and previous ischemic cardiomyopathy (OR= 0.34 (0.15 ; 0.77)) were poor prognostic factors. Therapeutic hypothermia or coronary procedures were not related to prognosis. Five trajectories of CPC could be derived among the 514 patients. Overall, 64% remained in CPC1, 13% in CPC2, 11% improved from CPC2 to CPC 12% died either early or lately (Figure 1). Conclusions: In this multicentric and prospective study, practice of sport and shockable rhythm were strongly associated with a favorable neurological recovery at 24 months. Furthermore, two thirds of the survivors remained in CPC 1 over time.

Abstract 102: Early Bolus Epinephrine Administration During Pediatric Cardiopulmonary Resuscitation for Bradycardia With Poor Perfusion

Introduction: Though epinephrine is recommended during CPR for children with bradycardia with poor perfusion, a registry study identified an association between epinephrine administration and worse outcomes. Our objective was to use granular data from the ICU-RESUScitation (ICU-RESUS) trial, including markers of illness severity not available in registries, to further investigate epinephrine use in this population. We hypothesized that when controlling for patient characteristics, early epinephrine administration would be associated with superior outcomes in children receiving CPR for bradycardia with poor perfusion. Methods: Prespecified secondary analysis of ICU-RESUS, a multicenter cluster randomized trial of pediatric (<19 years) IHCA in 18 PICUs. Index events (October 2016 to March 2021) lasting 2 minutes with an initial rhythm of bradycardia with poor perfusion were included. Early administration of bolus epinephrine (first 2 minutes of CPR) was chosen as the exposure since pulselessness during CPR for bradycardia with poor perfusion develops at a median of 3 minutes. The association between early epinephrine and outcomes was evaluated with Poisson multivariable regression controlling for a priori pre-arrest characteristics including Pediatric Risk of Mortality (PRISM) score and vasoactive inotropic score (VIS). Results: Of 452 patients, 322 (71.2%) received early epinephrine. The early epinephrine group had higher PRISM and VIS and more frequently received calcium and sodium bicarbonate. On univariate analysis, the early epinephrine group had lower, but not statistically significantly, rates of survival to discharge (174/322 [54%] vs 82/130 [63%], p=0.093) and survival with favorable neurologic outcome (164/322 [51%] vs 75/130 [58%], p=0.212). In multivariable analysis, early epinephrine was not associated with survival to discharge (RR 0.97, 95% CI 0.82, 1.14) or survival with favorable neurologic outcome (RR 0.99, 95% CI 0.82, 1.18). Conclusion: In this cohort of pediatric IHCA with an initial rhythm of bradycardia with poor perfusion, early bolus epinephrine was not associated with outcomes when controlling for illness severity. Further work should focus on which patients with this rhythm benefit from epinephrine.

Abstract 246: Consumptive Coagulopathy is Associated With Poor Neurological Outcome in Patients With Refractory VT/VF Cardiac Arrest Requiring Extracorporeal Cardiopulmonary Resuscitation

Introduction: Post cardiac arrest syndrome is associated with altered hemostasis. This is aggravated further by the foreign surface in the extracorporeal circuit leading to a coagulofibrinolytic imbalance. Aim: We examined the serial changes of consumptive coagulopathy markers and their association with neurologic outcomes. Methods: A single-center, retrospective cohort study of consecutive patients with VT/VF cardiac arrest meeting criteria for ECMO-facilitated resuscitation (ECPR) between December 2015 and January 2023 were included. Consumptive coagulopathy markers (INR, D-dimer, platelet count, antithrombin III and fibrinogen) were obtained after VA ECMO cannulation and serially on day 1, 2 and 3. We compared the coagulation profiles of patients who had a neurologically favorable outcome (defined as Cerebral Performance Categories (CPC) 1-2) and those with a neurologically unfavorable outcome (CPC 3-5). Results: Of 258 patients, 82 (32%) survived to hospital discharge. Of these, 87% (71/82) survived with favorable neurological outcome. Prolonged INR, elevated D-dimer levels and decreased ATIII levels were associated (p<0.05) with neurologically unfavorable survival and decreased over time (p<0.05)(Figure1). Platelet count and fibrinogen levels were not associated with neurological outcomes. In adjusted analysis (including age, lactate, CPR time and use of dual antiplatelet therapy), each point increase in the INR on day 1, 2 and 3 was associated with neurologically unfavorable survival (OR 4.4, p=0.01; OR 7.14, p=0.04; OR 8.5, p=0.03 respectively). Conclusion: Markers of consumptive coagulopathy with a prolonged INR are associated with unfavorable neurological outcome.

Abstract 245: A Validated Score to Predict Poor Neurological Outcome After 72 Hours of Refractory VF/VT in Out of Hospital Cardiac Arrest Patients Requiring Extracorporeal Cardiopulmonary Resuscitation

Introduction: The challenge with neuroprognostication is finding a multimodal prediction model that yields the lowest false positive rate for a poor outcome. Objectives: To develop and validate a score that accurately predicts poor neurological outcome after 72 hours of ECPR initiation. Methods: Single-center, retrospective cohort study included 361 OHCA patients who underwent ECPR at the University of Minnesota between December 2015-January 2023. In a 50% random modeling sample, we obtained a derivation (n=180) and validation sample (n=181). The primary outcome was poor neurological outcome (defined as CPC 3-5) at hospital discharge. Neurological predictors were neuro specific enolase (NSE)>3ULN on day 1, myoclonus status epilepticus on day 1-3, neurological pupillary index (NPI)<2 on day 3-6, Glasgow motor=3 on day 3-6, highly malignant pattern on EEG (hmEEG) on day 3-6, CT with anoxic brain injury on day 3, and absent of brainstem reflexes on day 3-6. Univariate and multivariate analysis were performed on each predictor. A simple prediction score tool was constructed and evaluated through ROC analysis. A youden index was used for optimal cut-off. Results: Of 361 patients, 170 (47%) survived to hospital discharge. Of these, 85% (145/170) survived with favorable neurological outcome. The final multivariate logistic regression model in the derivation sample retained eight predictors: Absence of witnessed status and bystander CPR; downtime≥ 7min, lactate≥ 9mmol, low flow≥ 55min, NSE>3ULN, hmEEG, CT with anoxic brain injury and absence of brainstem reflexes, which were combined to develop an 8-point risk scoring model Minnesota OHCA using ECPR (MECPR). Model discrimination had an AUC of 0.87 [95%CI 0.82-0.92] in the derivation sample and 0.86 [95% CI 0.85-0.92] in the validation sample, and calibration (goodness of fit p=0.04). MECPR≥6 predicted poor neurological outcome with a sensitivity ~21%, specificity 100% and a FPR 0%. A MECPR ≥4 and ≥6 had an 89% and 97% probability of poor neurological outcome, respectively. Conclusions: A simple, accurate prediction scoring tool (MECPR) based on a multimodal approach after 72hrs of refractory cardiac arrest provides estimates of probability of poor neurological outcome among patients treated with ECPR.

Abstract 264: Impact of Receiving Hospital on Disparities in Out-of-Hospital Cardiac Arrest

Background: Minority out-of-hospital cardiac arrest (OHCA) victims suffer from worse outcomes. The factors contributing to these disparities are not completely understood, and little is known about the impact of receiving hospital on OHCA. Hypothesis: Receiving hospital plays an important role in OHCA outcome disparities. Methods: We performed a retrospective, cohort study of the national Cardiac Arrest Registry to Enhance Survival (CARES). We included OHCAs from 2014- 2021 that survived to hospital admission. Based on census tract data, we stratified OHCAs based on majority race/ethnicity: >50% White, >50% Black, and >50% Hispanic/Latino. We stratified hospitals into quartiles based on hospital rate of the outcome, survival with favorable neurologic outcome, cerebral performance category of 1 of 2. We evaluated the association between race/ethnicity and care at increasing hospital performance quartile. We compared four models evaluating the association between race/ethnicity and outcome: 1) omitting receiving hospital and bystander CPR (B-CPR), 2) adjusting for B-CPR, 2) additionally adjusting for receiving hospital as a random intercept, and 3) adjusting for hospital performance quartile. We adjusted all models for possible confounders. Results: We include 124,908 OHCAs that survived to hospital admission; 90,034 majority White, 20,600 majority Black, and 14,338 majority Hispanic. Compared to White, Black (OR 0.1, 95% CI 0.1-0.1) and Hispanic OHCAs were less likely to be cared for at high performing hospitals. Ignoring receiving hospital, outcomes were worse for Black (19.7%, aOR 0.43, 95% CI 0.40-0.46) and Hispanic (22.1%, aOR 0.49, 95% CI 0.45-0.54) than White (33.5%). While adjusting for B-CPR did not change survival odds, adjusting for receiving hospital as a random intercept improved outcome odds for Black (aOR 0.60, 95% CI 0.54-0.67) and Hispanic (aOR 0.61, 95% CI 0.53-0.69). Adjusting for hospital performance quartile also improved outcome odds for Black (aOR 0.79, 95% CI 0.73-0.85) and Hispanic/Latino (aOR 0.78, 95% CI 0.70-0.86). Conclusion: OHCAs from minority communities were less likely to be cared for at higher performing hospitals, and adjusting for receiving hospital significantly diminished OHCA outcome disparities.

Abstract 13514: Unfavorable Neurological Outcomes With Incremental Cardiopulmonary Resuscitation Duration in Cardiac Arrest Brain Injury: A Systematic Review and Meta-Analysis

Introduction: Duration of Cardiopulmonary resuscitation (CPR) affects neurological outcomes. Data on its decremental effect on neurological outcomes haven’t been explored before Methods: PubMed, Scopus and Google Scholar were searched for relevant studies until May 2023 using relevant keywords. Odds of good neurological outcomes were studied. Binary random-effects models were used to estimate pooled odds ratios (OR) and 95% confidence intervals (CI). Leave one out sensitivity analysis was performed. Heterogeneity was assessed using I2 statistics. For outcomes showing moderate or high heterogeneity, subgroup analyses were performed for follow-up duration or type of study. A p<0.05 was considered statistically significant. Results: A total of 349,027 cardiac arrest patients (mean age: 70.2 years; males: 56.5%) from four studies were included in the meta-analysis. Of them the initial rhythm was shockable in 11% (38,465/349,027) and non-shockable in 88.97% (310,562/349,027) of the population. Odds of having favorable neurologic outcomes were OR 0.32 (95% CI 0.10-1.01, p=0.05) for 6-10-minute(n=14,118), OR 0.10 (95 %CI 0.02-0.64,p=0.02) for 11-15 min(n=43885), OR 0.05 (95% CI 0.01-0.36, p<0.01) for 16-20 minutes(n=66,174), OR 0.04 (95% CI 0.01-0.21, p< 0.01) for > 20 min(n=181,262) and OR 0.03 (95% CI 0.00-1.55, p=0.08) for > 30 minutes (n=66,461) when compared to patients receiving CPR for < 5 mins (n=6420).(Fig.1) Conclusions: Steady decremental odds of favorable neurological outcomes were seen with every five minutes of increase in CPR duration with a statistically significant decline seen in CPR duration of 11-15 mins onwards

Abstract 295: Predicting Outcomes in Adult Patients With Out-of-Hospital Cardiac Arrest; Results From the All-Japan Utstein Registry

Background: The recent cardiopulmonary resuscitation (CPR) Guideline addressed that there was no evidence to clearly define what should constitute selected patients in case of performing invasive CPR, such as extracorporeal CPR, for patients with cardiac arrest (CA). However, emergency physicians often need to determine the treatment strategy immediately upon arrival in emergency departments. The present study aimed to clarify the helpful factor of prehospital care to predict adult CA patients' prognosis using the All-Japan Utstein Registry data, a prospective, nationwide, population-based registry of out-of-hospital CA (OHCA). Methods: From the data of this registry, between 2005 and 2020, we included adult OHCA patients due to cardiac etiology. The endpoint was the favorable neurological outcome at 30 days after OHCA. The multivariable logistic regression analysis included potential confounding factors based on biological plausibility and previous studies. We scored based on the odds ratio. Receiver operating characteristic analysis was performed, and the area under the curve (AUC) was calculated for factors of the total score in order to assess the 30-day neurological outcome. Results: Of the 1,930,273 patients registered in this Registry, the data of 1,099,908 patients were included in this analysis. The table showed the adjusted odds ratio for 30-day favorable neurological outcomes in OHCA patients in the multivariate analysis, and the score based on the odds ratio. The AUC of the total scores was 0.956 (p < 0.001) with a cutoff value of 7, a sensitivity of 92%, and a specificity of 88%. In the case of this total score of less than 7, the 30-day favorable neurological outcome in CA patients was significantly low (total score < 7 vs. total score > 7 = 0.3% vs. 18.7%: p<0.001). Conclusion: This score might be a helpful factor in prehospital care information in CA patients to determine the treatment strategy upon arrival in emergency departments.

Abstract 406: Texas Out of Hospital Cardiac Arrest Disparities for Rural Patient Care From Statewide Out-of-Hospital Cardiac Arrest Data Registry - The Texas Cares Project

Introduction: Out-of-hospital cardiac (OHCA) arrest victims from rural settings suffer worse outcomes. We evaluated the association between rural setting and post-arrest care and outcomes. Hypothesis: Receiving treatment for OHCA at a rural hospital will be associated with a lower rate of post OHCA care and lower rate of favorable neurologic outcomes (cerebral performance score 1 or 2). Methods: We performed a retrospective analysis of the Texas Cardiac Arrest Registry to Enhance Survival (CARES) from 2014-2021. We included adult OHCAs not listed as DNR. We defined hospital urbanicity as the proportion of OHCAs originating from rural census tracts. We defined hospitals as rural if more than 25% of included OHCAs were rural. We evaluated the association between rural hospital status and patient and prehospital care characteristics - age, race, initial rhythm, response time, bystander CPR - and hospital care characteristics - targeted temperature management (TTM) and percutaneous coronary intervention (PCI) rates. We evaluated the association between rural hospital status and favorable neurological outcomes with logistic regression, adjusted for patient and prehospital factors, hospital care, and census tract median household income. Results: We included 31,569 encounters with OHCA at 161 unique hospitals. The rural hospital group included 1,213 OHCA encounters (3.8%) at 25 hospitals (15.5%). Patient factors between groups were similar other than a higher rate of white patients in the rural group. Rates of angiography (16.1% non rural, 17.1% rural), PCI (8.2%, 8.7%), and TTM (30.6%,34.7%) were not statistically different. Treatment at rural hospitals was not associated with a statistically significant decreased odds of good neurological outcome (aOR 1.02, 95%ci 0.83-1.24). Conclusion: Treatment for OHCA at rural hospitals was not associated with a lower rate of post OHCA care or lower rate of favorable neurologic outcome

Abstract 217: Chest Compression on Aortic Valve Decreases Chance of Return of Spontaneous Circulation for Patients Experiencing Out-of-Hospital Cardiac Arrest

Background: Current CPR guidelines recommend applying chest compression at "the center of the chest" for patients undergoing out-of-hospital cardiac arrest (OHCA). However, studies revealed that following this recommendation, around half of OHCA patients would receive compressions on the aortic valve (AV), potentially obstructing blood flow and worsening prognosis. Hypothesis and Aim: We aimed to use transesophageal echocardiography (TEE) during cardiopulmonary resuscitation (CPR) to test the hypothesis of the impact of AV compression vs AV non-compression on adult OHCA patients' outcomes. Methods: This prospective cohort study included OHCA patients receiving TEE exams during CPR. Exclusion criteria were the return of spontaneous circulation (ROSC) before TEE, unidentifiable compression site, or unqualified TEE image. Patients were divided into AV-compressed or non-compressed groups based on initial TEE findings. Patient characteristics, TEE recordings, resuscitation data, and critical time points were analyzed. Primary outcome was sustained ROSC. Secondary outcomes included any ROSC, survival to admission, survival to discharge, and favorable neurological outcomes upon discharge defined by MRS ≤ 2. The sample size was pre-estimated as 37 patients per group. Results: A total of 76 patients from October 2020 to January 2023 were enrolled for analysis, with 39 in the AV non-compressed group and 37 in the AV-compressed group. Baseline characteristics were similar between groups. Compared to the compressed group, the non-compressed group had a better chance of sustained ROSC [adjusted odds ratio (aOR) 4.72, p=0.010], any ROSC (aOR 3.30, p=0.033), and survival to admission (aOR 6.74, p=0.010). The main results were tabulated as below. Conclusions: CPR with compressed AV decreased the chances of ROSC among OHCA patients.

Abstract 262: Mediating Factors Between Community Race/Ethnicity and Initial Shockable Rhythm

Background: Initial shockable rhythm is an important predictor of favorable out-of-hospital cardiac arrest (OHCA) outcomes. While patients from minoritized communities suffer from lower rates of initial shockable rhythm, the reason for this disparity is not known. Hypothesis: OHCA characteristics contribute to disparities in initial shockable rhythm. Methods: We performed a retrospective study of the 2014-2021 Texas Cardiac Arrest Registry to Enhance Survival, including adult, non-traumatic OHCAs. Linked to census tract data, we stratified OHCAs based on having a majority of a race/ethnicity: >50% White, >50% Black, and >50% Hispanic/Latino. To evaluate if initial shockable rhythm impacts outcome disparities, we compared logistic regression models between race and OHCA outcomes: 1) unadjusted, 2) adjusted for bystander CPR (bCPR), and 3) adjusted for initial rhythm. Using structural equation modeling, we then performed a mediation analysis between race/ethnicity, OHCA characteristics, and shockable rhythm, reporting the mediations proportions. Results: We included 39,596 OHCAs, 16,702 White, 5,461 Black, and 17,433 Hispanic. The rate of shockable rhythm was 19.0% for White, 14.3% for Black, and 14.6% for Hispanic. Odds of favorable neurologic outcome were lower for Black (OR 0.5, 95% CI 0.4-0.6) and Hispanic (OR 0.6, 95% CI 0.6-0.7). While adjusting for bCPR did not change these odds, adjusting for shockable rhythm increased odds for Black (OR 0.6, 95% CI 0.5-0.7) and Hispanic (OR 0.7, 95% CI 0.6-0.8). On mediation analysis, the proportion of initial shockable rhythm mediated for Black census tract were: age>65 (-7.3%), male gender (6.8%), public location (6.9%), healthcare facility location (-17.2%), bystander witnessed (19.2%), bCPR (4.3%), and bystander AED (6.4%). The proportion mediated for Hispanic census tract were: age>65 (-4.8%), male gender (0.5%), public location (-4.0%), healthcare location (-13.5%), bystander witnessed (20.8%), bCPR (8.7%), and bystander AED (6.2%). Conclusion: Bystander witnessed arrest was the most significant mediator of shockable rhythm for OHCA in Black and Hispanic communities, while bCPR was a modest mediator of shockable rhythm for Hispanic OHCA victims.

The association of tibial vs. humeral intraosseous vascular access with patient outcomes in adult out-of-hospital cardiac arrests

AimHumeral and tibial intraosseous (IO) vascular access can deliver resuscitative medications for out-of-hospital cardiac arrest (OHCA), however the optimal site is unclear. We examined the association between IO tibia vs. humerus as the first-attempted vascular access site with OHCA outcomes. MethodsWe used prospectively-collected data from the British Columbia Cardiac Arrest registry, including adult OHCAs treated with IO humerus or IO tibia as the first-attempted intra-arrest vascular access. We fit logistic regression models on the full study cohort and a propensity-matched cohort, to estimate the association between IO site and both favorable neurological outcomes (Cerebral Performance Category 1–2) and survival at hospital discharge. ResultsWe included 1041 (43%) and 1404 (57%) OHCAs for whom IO humerus and tibia, respectively, were the first-attempted intra-arrest vascular access. Among humerus and tibia cases, 1010 (97%) and 1369 (98%) had first-attempt success, and the median paramedic arrival-to-successful access interval was 6.7 minutes (IQR 4.4–9.4) and 6.1 minutes (IQR 4.1–8.9), respectively. In the propensity-matched cohort (n = 2052), 31 (3.0%) and 44 (4.3%) cases had favourable neurological outcomes in the IO humerus and IO tibia groups, respectively; compared to IO humerus, we did not detect an association between IO tibia with favorable neurological outcomes (OR 1.44; 95% CI 0.90–2.29) or survival to hospital discharge (OR 1.29; 95% CI 0.83–2.01). Results using the full cohort were similar. ConclusionsWe did not detect an association between the first-attempted intra-arrest IO site (tibia vs. humerus) and clinical outcomes. Clinical trials are warranted to test differences between vascular access strategies.

Invasive Multimodality Neuromonitoring to Manage Cerebral Edema in Pediatric Myelin Oligodendrocyte Glycoprotein Antibody-Associated Disease

Background: Myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD) is an inflammatory disorder of the CNS with a variety of clinical manifestations, including cerebral edema. Case Summary: A 7-year-old boy presented with headaches, nausea, and somnolence. He was found to have cerebral edema that progressed to brainstem herniation. Invasive multimodality neuromonitoring was initiated to guide management of intracranial hypertension and cerebral hypoxia while he received empiric therapies for neuroinflammation. Workup revealed serum myelin oligodendrocyte glycoprotein antibodies. He survived with a favorable neurologic outcome. Conclusion: We describe a child who presented with cerebral edema and was ultimately diagnosed with MOGAD. Much of his management was guided using data from invasive multimodality neuromonitoring. Invasive multimodality neuromonitoring may have utility in managing life-threatening cerebral edema due to neuroinflammation.