Bacterial small RNAs may mediate immune response differences seen in respiratory syncytial virus versus rhinovirus bronchiolitis.

Bronchiolitis, a viral lower respiratory infection, is the leading cause of infant hospitalization, which is associated with an increased risk for developing asthma later in life. Bronchiolitis can be caused by several respiratory viruses, such as respiratory syncytial virus (RSV), rhinovirus (RV), and others. It can also be caused by a solo infection (e.g., RSV- or RV-only bronchiolitis) or co-infection with two or more viruses. Studies have shown viral etiology-related differences between RSV- and RV-only bronchiolitis in the immune response, human microRNA (miRNA) profiles, and dominance of certain airway microbiome constituents. Here, we identified bacterial small RNAs (sRNAs), the prokaryotic equivalent to eukaryotic miRNAs, that differ between infants of the 35th Multicenter Airway Research Collaboration (MARC-35) cohort with RSV- versus RV-only bronchiolitis. We first derived reference sRNA datasets from cultures of four bacteria known to be associated with bronchiolitis (i.e., Haemophilus influenzae, Moraxella catarrhalis, Moraxella nonliquefaciens, and Streptococcus pneumoniae). Using these reference sRNA datasets, we found several sRNAs associated with RSV- and RV-only bronchiolitis in our human nasal RNA-Seq MARC-35 data. We also determined potential human transcript targets of the bacterial sRNAs and compared expression of the sRNAs between RSV- and RV-only cases. sRNAs are known to downregulate their mRNA target, we found that, compared to those associated with RV-only bronchiolitis, sRNAs associated with RSV-only bronchiolitis may relatively activate the IL-6 and IL-8 pathways and relatively inhibit the IL-17A pathway. These data support that bacteria may be contributing to inflammation differences seen in RSV- and RV-only bronchiolitis, and for the first time indicate that the potential mechanism in doing so may be through bacterial sRNAs.

A Comparison of State-Specific Pediatric Emergency Medical Facility Recognition Programs, 2020.

OBJECTIVES: Prior research suggests that the presence of state-specific pediatric emergency medical facility recognition programs (PFRPs) is associated with high emergency department (ED) pediatric readiness. The PFRPs aim to improve the quality of pediatric emergency care, but individual state programs differ. We aimed to describe the variation in PFRP characteristics and verification requirements and to describe the availability of pediatric emergency care coordinators (PECCs) in states with PFRPs. METHODS: In mid-2020, we collected information about each PFRP from 3 sources: the state Emergency Medical Services for Children (EMSC) website, the EMSC Innovation and Improvement Center website, or via communication with the state's EMSC program manager. For each state with a PFRP, we documented program characteristics, including program start date, number of tiers, whether participation was required/optional, and requirements for verification. RESULTS: Overall, we identified 17 states with active PFRPs. Five states had only 1 tier or level of recognition whereas the others had multiple. All programs did require presence of a PECC for verification. However, some PRFPs with multiple verification tiers did not require presence of a PECC to achieve each level of verification. In states with PFRPs, EDs with higher total visit volumes, a separate pediatric ED area, located in the Northeast, and earlier program start date were all more likely to have a PECC. CONCLUSIONS: There is variation in state PFRPs, although all prioritize the presence of a PECC. We encourage further research on the effect of different aspects of PFRPs on patient outcomes.

Comparison of US emergency departments by HIV priority jurisdiction designation: A case for geographically targeted screening in teaching hospitals.

The Ending the HIV Epidemic (EHE) Initiative targets a subset of United States (US) priority jurisdictions hardest hit by HIV. It remains unclear which emergency departments (EDs) are the most appropriate targets for EHE-related efforts. To explore this, we used the 2001-2019 National Emergency Department Inventories (NEDI)-USA as a framework to characterize all US EDs, focusing on those in priority jurisdictions and those affiliated with a teaching hospital. We then incorporate multivariable regression to explore the association between ED characteristics and location in an HIV priority jurisdiction. Further, to provide context on the communities these EDs serve, demographic and socioeconomic information and sexually transmitted infection case rate data were included. This reflected 2019 US Census Bureau data on age, race, ethnicity, and proportion uninsured and living in poverty along with 2001-2019 Centers for Disease Control and Prevention case rate data on chlamydia, gonorrhea, and syphilis. We found that EDs in priority jurisdictions (compared to EDs not in priority jurisdictions) more often served populations emphasized in HIV-related efforts (i.e., Black or African American or Hispanic or Latino populations), communities with higher proportions uninsured and living in poverty, and counties with higher rates of chlamydia, gonorrhea, and syphilis. Further, of the groups studied, EDs with teaching hospital affiliations had the highest visit volumes and had steady visit volume growth. In regression, ED annual visit volume was associated with an increased odds of an ED being located in a priority jurisdiction. Our results suggest that geographically targeted screening for HIV in a subset of US priority jurisdiction EDs with a teaching hospital affiliation could be an efficient means to reach vulnerable populations and reduce the burden of undiagnosed HIV in the US.

Epigenome-wide association analysis of infant bronchiolitis severity: a multicenter prospective cohort study.

Bronchiolitis is the most common lower respiratory infection in infants, yet its pathobiology remains unclear. Here we present blood DNA methylation data from 625 infants hospitalized with bronchiolitis in a 17-center prospective study, and associate them with disease severity. We investigate differentially methylated CpGs (DMCs) for disease severity. We characterize the DMCs based on their association with cell and tissues types, biological pathways, and gene expression. Lastly, we also examine the relationships of severity-related DMCs with respiratory and immune traits in independent cohorts. We identify 33 DMCs associated with severity. These DMCs are differentially methylated in blood immune cells. These DMCs are also significantly enriched in multiple tissues (e.g., lung) and cells (e.g., small airway epithelial cells), and biological pathways (e.g., interleukin-1-mediated signaling). Additionally, these DMCs are associated with respiratory and immune traits (e.g., asthma, lung function, IgE levels). Our study suggests the role of DNA methylation in bronchiolitis severity.

Association between severe bronchiolitis in infancy and age 6-year lung function.

BACKGROUND AND OBJECTIVES: Understanding early life risk factors for decreased lung function could guide prevention efforts and improve lung health throughout the lifespan. Our objective was to investigate the association between history of severe (hospitalized) bronchiolitis in infancy and age 6-year lung function. METHODS: We analyzed data from two prospective cohort studies: infants hospitalized with bronchiolitis and a parallel cohort of healthy infants. Children were followed longitudinally, and spirometry was performed at age 6 years. To examine the relationship between history of severe bronchiolitis and primary outcomes - FEV1% predicted (pp) and FEV1/FVCpp - we used multivariable linear regression models adjusted for insurance status, perterm birth, secondhand smoke exposure, breastfeeding status, traffic-related air pollution and polygenic risk score. Secondary outcomes included FVCpp and bronchodilator responsiveness (BDR). RESULTS: Age 6-year spirometry was available for 425 children with history of severe bronchiolitis in infancy and 48 controls. Unadjusted analysis revealed that while most children had normal range lung function, children with a history of severe bronchiolitis had lower FEV1pp and FEV1/FVCpp. In adjusted analyses, the same findings were observed: FEV1pp was 8% lower (p = 0.004) and FEV1/FVCpp was 4% lower (p = 0.007) in children with history of severe bronchiolitis versus controls. FVC and BDR did not differ between groups. CONCLUSIONS: Children with severe bronchiolitis in infancy have decreased FEV1 and FEV1/FVC at age 6 years, compared to controls. These children may be at increased risk for chronic respiratory illness later in life.

Application of Asthma Prediction Tools in a Cohort of Infants with Severe Bronchiolitis.

Background: Severe bronchiolitis is a strong childhood asthma risk factor. Early and accurate asthma prediction is key. We applied the Asthma Predictive Index (API), the modified Asthma Predictive Index (mAPI), and the Pediatric Asthma Risk Score (PARS) in a cohort of high-risk infants to predict asthma at age 6 years. Methods: We conducted a 17-center cohort of infants (age <1 year) hospitalized with severe bronchiolitis during 2011-2014. We used only infancy data to predict asthma at age 6 years. Results: The prevalence of parent-reported asthma at age 6 years was 328/880 (37%). The prevalences of a positive index/score for stringent and loose API, mAPI, and PARS were 21%, 51%, 11%, and 34%, respectively. Area under the receiver operating characteristic curves [95% confidence interval (CI)] ranged from 0.57 (95% CI 0.55-0.60) for mAPI to 0.66 (95% CI 0.63-0.70) for PARS. Conclusions: An asthma prediction tool for high-risk infants is needed to identify those who would benefit most from asthma prevention interventions.

Factors associated with mild bronchiolitis in young infants.

Objective: Bronchiolitis within the first 3 months of life is a risk factor for more severe illness. We aimed to identify characteristics associated with mild bronchiolitis in infants ≤90 days old presenting to the emergency department (ED). Methods: We conducted a secondary analysis of infants ≤90 days old with clinically diagnosed bronchiolitis using data from the 25th Multicenter Airway Research Collaboration prospective cohort study. We excluded infants with direct intensive care unit admissions. Mild bronchiolitis was defined as (1) sent home after the index ED visit and did not have a return ED visit or had a return ED visit without hospitalization, or (2) were hospitalized from the index ED visit to the inpatient floor for <24 hours. Multivariable logistic regression, adjusting for potential clustering by hospital site, was used to identify factors associated with mild bronchiolitis. Results: Of 373 infants aged ≤90 days, 333 were eligible for analysis. Of these, 155 (47%) infants had mild bronchiolitis, and none required mechanical ventilation. Adjusting for infant characteristics, clinical factors associated with mild bronchiolitis included older age (61-90 days vs 0-60 days) (odds ratio [OR] 2.72, 95% confidence interval [CI] 1.52-4.87), adequate oral intake (OR 4.48, 95% CI 2.08-9.66), and lowest ED oxygen saturation ≥94% (OR 3.12, 95% CI 1.55-6.30). Conclusions: Among infants aged ≤90 days presenting to the ED with bronchiolitis, about half had mild bronchiolitis. Mild illness was associated with older age (61-90 days), adequate oral intake, and oxygen saturation ≥94%. These predictors may help in the development of strategies to limit unnecessary hospitalization in young infants with bronchiolitis.

Recurrent wheezing phenotypes after severe bronchiolitis and progression to asthma.

Background: Recurrent wheezing, a common diagnosis after severe bronchiolitis, has multiple phenotypes of uncertain relation to childhood asthma. Objective: Among infants hospitalized for bronchiolitis, we investigated the relation of three 2020 recurrent wheezing phenotypes by age 4 years to asthma by age 6 years. Methods: In a 17-center cohort study of infants hospitalized with bronchiolitis, we investigated the National Heart, Lung, and Blood Institute (NHLBI) 2020-defined recurrent wheezing phenotype and 2 additional phenotypes based on this definition: multitrigger and severe. As a sensitivity analysis, we examined the NHLBI 2007 recurrent wheezing phenotype. We calculated the proportion of study subjects who developed asthma by age 6 years and used multivariable logistic regression to examine characteristics associated with the highest-risk 2020 phenotype. Results: Of 921 infants, 632 (69%) developed NHLBI 2020 recurrent wheezing, 734 (80%) developed multitrigger wheezing, and 165 (18%) developed severe wheezing by age 4 years; in addition, 296 (32%) developed NHLBI 2007-defined recurrent wheezing by age 3 years. Of 862 children with sufficient data (94%), 239 (28%) developed asthma by age 6 years. The proportions of children who progressed to asthma were as follows: 33% of those with NHLBI 2020-defined wheezing, 33% of those with multitrigger wheezing, 54% of those with severe wheezing, and 52% of those with NHLBI 2007-defined recurrent wheezing. The children with the severe phenotype who developed asthma had the associated characteristics preterm birth, child eczema, maternal asthma, and non-respiratory syncytial virus infection. Conclusion: Most infants with severe bronchiolitis developed the NHLBI 2020-defined recurrent wheezing phenotype by age 4 years. Depending on the phenotype, 33% to 54% will develop asthma by age 6 years. Future research will examine whether earlier treatment of high-risk phenotypes will improve wheezing symptoms and potentially prevent childhood asthma. (J Allergy Clin Immunol Global 2023;2:84-7.).

Availability of Pediatric Emergency Care Coordinators in US Emergency Departments in 2018.

OBJECTIVES: In 2007, the US Institute of Medicine recommended that every emergency department (ED) appoint pediatric emergency care coordinators (PECCs). Despite this recommendation, our national surveys showed that few (17%) US EDs reported at least 1 PECC in 2015. This number increased slightly to 19% in 2016 and 20% in 2017. The current study objectives were to determine the following: percent of US EDs with at least 1 PECC in 2018, factors associated with availability of at least 1 PECC in 2018, and factors associated with addition of at least 1 PECC between 2015 and 2018. METHODS: In 2019, we conducted a survey of all US EDs to characterize emergency care in 2018. Using the National ED Inventory-USA database, we identified 5514 EDs open in 2018. This survey collected availability of at least 1 PECC in 2018. A similar survey was administered in 2016 and identified availability of at least 1 PECC in 2015. RESULTS: Overall, 4781 (87%) EDs responded to the 2018 survey. Among 4764 EDs with PECC data, 1037 (22%) reported having at least 1 PECC. Three states (Connecticut, Massachusetts, and Rhode Island) had PECCs in 100% of EDs. The EDs in the Northeast and with higher visit volumes were more likely to have at least 1 PECC in 2018 (all P < 0.001). Similarly, EDs in the Northeast and with higher visit volumes were more likely to add a PECC between 2015 and 2018 (all P < 0.05). CONCLUSIONS: The availability of PECCs in EDs remains low (22%), with a small increase in national prevalence between 2015 and 2018. Northeast states report a high PECC prevalence, but more work is needed to appoint PECCs in all other regions.

Case-control study of exclusive breast feeding and severe bronchiolitis in the United States.

BACKGROUND: Bronchiolitis is a major cause of infant illness, with few known modifiable risk factors. Breast feeding may reduce risk of severe bronchiolitis, but the association of exclusive vs. partial breast feeding with severe bronchiolitis is unclear. OBJECTIVE: To estimate the association of exclusive vs. partial breast feeding during ages 0-2.9 months with bronchiolitis hospitalisation during infancy. METHODS: We conducted a case-control study as a secondary analysis of two prospective US cohorts in the Multicenter Airway Research Collaboration. Cases were enrolled in a 17-centre study of infants hospitalised for bronchiolitis during 2011-2014 (n = 921). Controls were enrolled in a five-centre study of healthy infants during 2013-2014 and 2017 (n = 719). Breast feeding history during ages 0-2.9 months was collected by parent interview. Among breastfed infants, the association of exclusive vs. partial breast feeding with odds of bronchiolitis hospitalisation was estimated using a multivariable logistic regression model adjusted for demographic variables, parental asthma history, and early-life exposures. As a secondary analysis, we estimated the associations of exclusive, predominant, and occasional breast feeding vs. no breast feeding with the odds of bronchiolitis hospitalisation. RESULTS: Among 1640 infants, the prevalence of exclusive breast feeding was 187/921 (20.3%) among cases and 275/719 (38.3%) among controls. Exclusive vs. partial breast feeding was associated with 48% reduced odds of bronchiolitis hospitalisation (adjusted odds ratio [OR] 0.52, 95% confidence interval [CI] 0.39, 0.69). In the secondary analysis, exclusive vs. no breast feeding was associated with 58% reduced odds of bronchiolitis hospitalisation (OR 0.42, 95% CI 0.23, 0.77), whereas predominant breast feeding (OR 0.77, 95% CI 0.37, 1.57) and occasional breast feeding (OR 0.98, 95% CI 0.57, 1.69) were not associated with meaningfully reduced odds of bronchiolitis hospitalisation. CONCLUSION: Exclusive breast feeding had a strong protective association against bronchiolitis hospitalisation.

Pregnancy- and birth-related risk factors for the development of childhood celiac disease.

AIM: To evaluate whether pregnancy and birth-related factors are associated with celiac disease (CD) in a large, United States (US)-based mother-child cohort. METHODS: We analysed data gathering from the Massachusetts General Hospital Maternal Child Cohort (MMCC) of children born between 1998 and 2016. Data included the mode of delivery, maternal pregnancy and their offspring characteristics. We searched for CD cases by using diagnosis billing codes. Cox proportional hazard regression models were created to identify variables associated with CD. RESULTS: We identified 44 539 mother-child pairs who had at least one encounter by 5 years old and identified 173 children (0.4%) with CD diagnosis; median age at the diagnosis was 6 years. Overall, the adjusted hazard ratio (aHR) of caesarean delivery for CD was 1.39 (95% CI: 0.99, 1.96, p = 0.06) when compared to children born vaginally. After stratifying for the presence of labour, children born by Caesarean delivery without labour had a higher risk of CD (aHR 1.56; 95%CI: 1.01, 2.41; p = 0.046) while infants born by Caesarean delivery with labour did not (aHR 1.26; 95% CI: 0.83, 1.93; p = 0.28). CONCLUSION: Being born by Caesarean delivery without labour may be associated with an increased risk for CD in the US children.

Development of a unified national trauma center database, 2018.

OBJECTIVE: Trauma center certifications across the United States (U.S.) are not unified. Participation in the national trauma certification program established through the American College of Surgeons (ACS) is not universal, and many states maintain unique trauma certification systems with varying criteria. We investigated degree of similarity between the ACS national trauma certification program and state trauma certifications, then combined these distinct certifications into a unified national trauma center database. METHODS: We performed a cross-sectional study of all non-specialty, non-federal emergency U.S. departments (EDs) open in 2018 to determine availability and levels of trauma centers. We created a "Standard" definition of trauma levels using ACS criteria as a benchmark. ACS similar trauma levels were then assigned to state levels I-III by comparing trauma receiving protocol, maximum response times, and general surgical coverage; through this process, levels across distinct systems established through different criteria were standardized. RESULTS: In 2018, ACS certifications spanned 47 states and DC; 3 states did not participate in ACS (Mississippi, Pennsylvania, and Washington). A distinct, non-ACS state certification system was present in 47 states and DC; 3 states had no ongoing state certification system in 2018 (Maine, Rhode Island, and Vermont). Among 5,514 US EDs open in 2018, we identified 2,132 associated with adult and pediatric trauma centers (39%) holding certification (ACS, state, or both); 1,083 (51%) were certified levels I-III, and the rest (1,049, 49%) were levels IV-V. Of the 1,083 centers with any level I-III certification, 498 (46%) held ACS certification, and 1,059 (98%) held state certification. Applying ACS-similar criteria to centers with state levels I-III (n=1,059) resulted in a level change for 124 centers (12%). Using our "Standard" definition of a trauma level based on ACS criteria, our unified level I-III database included 959 (89%) adult and pediatric centers, with 24 (3%) ACS-certified only, 461 (48%) state-certified only, and 474 (49%) certified by both. CONCLUSIONS: Discrepancies exist between ACS and state trauma certification systems. The differences in level I-III state criteria confirm discrepant standards for a given trauma "level" across the U.S. We combined these certifications into a unified national trauma center database available to researchers and the public.

Development of a unified national database of primary percutaneous coronary intervention centers with co-located emergency departments, 2020.

BACKGROUND: Although primary percutaneous coronary intervention (pPCI) is the preferred intervention for ST-elevation myocardial infarction (STEMI), not all patients are admitted directly to an emergency department (ED) with 24/7/365 pPCI capabilities. This is partly due to a lack of a national system of known pPCI-capable EDs. Our objective was to create a unified, national database of confirmed 24/7/365 pPCI centers co-located in hospitals with EDs. METHODS: We compiled all hospitals designated as Chest Pain Centers with Primary PCI by the American College of Cardiology's (ACC) National Clinical Data Registry (NCDR), all STEMI Receiving Centers designated by the American Heart Association's (AHA) Mission: Lifeline registry, and all state-designated pPCI-capable hospitals and designation criteria from state departments of health. We matched ACC, AHA, and state-designated facilities to those in the 2019 National ED Inventory (NEDI)-USA database to identify all EDs in pPCI-capable hospitals. RESULTS: Overall, 467 hospitals were recognized as Chest Pain Centers with Primary PCI by ACC, 293 hospitals were recognized as being STEMI Receiving Centers by AHA, and 827 hospitals were confirmed to be pPCI-capable by state designations and operated 24/7/365. Together, there were 1,178 EDs (21% of 5,587 total) co-located in pPCI-capable hospitals operating 24/7/365. CONCLUSIONS: There is substantial heterogeneity in cardiac systems of care, with large regional systems existing alongside local state-led initiatives. We created a unified national database of confirmed 24/7/365 pPCI centers co-located in hospitals with EDs. This data set will be valuable for future cardiac systems research and improving access to pPCI.

United States 2020 Emergency Medicine Resident Workforce Analysis.

STUDY OBJECTIVE: To characterize the emergency medicine resident physician workforce and the residency programs training them. METHODS: We identified emergency medicine residents in the 2020 American Medical Association (AMA) Physician Masterfile, analyzed demographic information, mapped both county-level population-adjusted and hospital referral region densities, and compared 2020 versus 2008 resident physician densities. We also analyzed all Accreditation Council for Graduate Medical Education (ACGME)-accredited emergency medicine residency programs from 2013 to 2020, mapped state-level population-adjusted densities, and identified temporal trends in program location and state-level program densities. All population-adjusted densities were calculated using the US Census Bureau resident population estimates. RESULTS: There were 6,993 emergency medicine residents in the 2020 AMA dataset with complete information. Most of them (98%) were in urban areas. Compared with 2008, per 100,000 US population, this represents disproportionate increases in urban areas (total [0.5], urban [0.5], large rural [0.2] and small rural [0.05]). We further identified 160 (2013) to 265 (2020) residency programs using the ACGME data. The new programs were 3-year training programs that were disproportionately added to states with an already higher number of programs (Florida [5 to 19], Michigan [11 to 25], New York [21 to 31], Ohio [9 to 18], Pennsylvania [12 to 21], California [14 to 22]). CONCLUSION: The number of emergency medicine residency programs has increased; most new programs were added to the states that already had emergency medicine residency programs. There is an emergency physician "desert" in the rural United States, lacking both residents and residency training programs. This analysis provides essential context to the ongoing conversation about the future of the emergency physician workforce.

Evaluation of the American Hospital Association Annual Survey for health services research in emergency medicine.

Objectives: Emergency department (ED) data are often used to address questions about access to and quality of emergency care. Our objective was to compare one of the most commonly used data sources for national ED information, the American Hospital Association (AHA) Annual Survey, with a criterion database: the National Emergency Department Inventory (NEDI)-USA data set. Methods: We compared the 2015 and 2016 AHA surveys to the following 3 criterion standards: (1) the 2015 and 2016 NEDI-USA databases, which have information about all US EDs, including merged data from (2) Council of Teaching Hospitals (COTH) and (3) the Critical Access Hospital (CAH) program. We present descriptive results about the number of EDs in each data set; total and median visit volumes; locations in rural areas; and COTH, CAH, and freestanding ED (FSED) status. Results: The AHA survey identified 3893 US EDs in 2015. These EDs had a total annual visit volume of 129,197,493 visits, with a median of 22,772 visits (interquartile range, 8311-47,938). Compared with the NEDI-USA, the AHA included 1433 fewer EDs (-27%; 95% confidence interval [CI], -28% to -26%) and 23,615,163 (-15%) fewer visits. Specifically, AHA was missing 245 (-22%; 95% CI, -24% to -19%) of those located in rural areas, 268 (-20%; 95% CI, -22% to -18%) in a CAH, and 240 (-47%; 95% CI, -51% to -42%) FSEDs. We saw similar results using 2016 data. Conclusions: Although several aggregated results were similar between the compared data sources, the AHA data set excluded many US EDs, including many rural EDs and FSEDs. Consequently, the AHA underreported total ED visits by 15%. We encourage data users to be cautious when interpreting results from any 1 ED data source, including the AHA.

An inventory of stroke centers in the United States.

OBJECTIVES: Stroke centers are essential for the optimal care of patients with acute stroke. However, there is no universally applied standard for stroke center certification/designation and no unified list of confirmed US stroke centers. Multiple national organizations, and some state governments, certify/designate hospitals as stroke centers of various levels, but discrepancies exist between these systems. We aimed to create a unified, easily accessible, national stroke center database. METHODS: Lists of confirmed stroke centers were obtained from national certifying bodies (The Joint Commission [TJC], Det Norske Veritas, and Healthcare Facilities Accreditation Program) and each state government. Lists were reconciled to a common standard based on TJC requirements and incorporated into the 2018 National Emergency Department Inventory-USA database, which includes all emergency departments (EDs). RESULTS: Among 5533 US EDs, we confirmed 2446 (44%) as stroke centers, including 297 Comprehensive Stroke Centers, 14 Thrombectomy-capable Stroke Centers, 1459 Primary Stroke Centers, and 678 Acute Stroke Ready Hospitals. Compared with EDs without stroke centers, EDs with stroke centers had higher annual visit volumes, were more often academic, and were more often located in hospitals that had trauma or burn centers. CONCLUSION: We report the consolidation of multiple stroke center designation groups with varying criteria into a unified list of all confirmed US stroke centers linked to a comprehensive, national ED database. This data set will be valuable for future stroke systems research and improving access to emergency stroke care for patients. These data have the potential to further optimize the emergency care of patients with stroke.