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Background: The use of International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9) diagnostic codes can identify racial disparities in ischemic stroke hospitalizations; however, inclusion of revascularization procedure codes as acute stroke events may affect the magnitude of the risk difference. This study assesses the impact of excluding revascularization procedure codes in the ICD-9 definition of ischemic stroke, compared with the traditional inclusive definition, on racial disparity estimates for stroke incidence and recurrence.Methods: Patients discharged with a diagnosis of ischemic stroke (ICD-9 codes 433.00-434.91 and 436) were identified from a statewide inpatient discharge database from 2010 to 2012. Race-age specific disparity estimates of stroke incidence and recurrence and 1-year cumulative recurrent stroke rates were compared between the routinely used traditional classification and a modified classification of stroke that excluded primary ICD-9 cerebral revascularization procedures codes (38.12, 00.61, and 00.63).Results: The traditional classification identified 7878 stroke hospitalizations, whereas the modified classification resulted in 18% fewer hospitalizations (n = 6444). The age-specific black to white rate ratios were significantly higher in the modified than in the traditional classification for stroke incidence (rate ratio, 1.50; 95% confidence interval [CI], 1.43-1.58 vs. rate ratio, 1.24; 95% CI, 1.18-1.30, respectively). In whites, the 1-year cumulative recurrence rate was significantly reduced by 46% (45-64 years) and 49% (≥ 65 years) in the modified classification, largely explained by a higher rate of cerebral revascularization procedures among whites. There were nonsignificant reductions of 14% (45-64 years) and 19% (≥ 65 years) among blacks.Conclusions: Including cerebral revascularization procedure codes overestimates hospitalization rates for ischemic stroke and significantly underestimates the racial disparity estimates in stroke incidence and recurrence. [ABSTRACT FROM AUTHOR]

Background: The administration of thrombolysis to eligible patients is often limited to centers with expertise. This study was intended to report on the safety and efficacy (in increasing thrombolysis availability) of telemedicine in the acute assessment and treatment of stroke patients presenting to hospitals in distant locations from a designated stroke center. Methods: A web-based telestroke tool (remote evaluation of acute ischemic stroke at Medical University of South Carolina [REACH-MUSC]), was implemented to provide acute stroke care 24 hours per day, 7 days per week to 12 community hospitals in South Carolina. Results: Nine hundred sixty-five consults were performed. Among the 525 patients with a National Institutes of Health Stroke Score >3, 185 (35.7%) were treated with intravenous tissue plasminogen activator (t-PA) alone, 15 (2.9%) received combination of intravenous and intra-arterial thrombolysis/thrombectomy, and 11 (2.1%) were treated with intra-arterial therapy alone. Of those who received intravenous t-PA, 119 (64.3%) were transferred to the hub; the medians (interquartile range) for onset to treatment for the intravenous t-PA and the intravenous t-PA and intra-arterial groups were 152 (range 115-193) minutes and 147 (range 107-179) minutes, respectively. Three patients (1.6%) who received intravenous t-PA alone experienced symptomatic intracerebral hemorrhage. The most common reason for not receiving thrombolysis was patient presentation outside the time window for treatment. Conclusions: Telestroke can have a major impact in increasing thrombolysis rates in remote areas from specialized centers, and in particular in areas where t-PA is underutilized. [Copyright &y& Elsevier]

Study objective: The Institute of Medicine Committee on the Future of Emergency Care in the United States Health System (2003) identified a need to enhance the research base for emergency care. As a result, a National Institutes of Health (NIH) Task Force on Research in Emergency Medicine was formed to enhance NIH support for emergency care research. Members of the NIH Task Force and academic leaders in emergency care participated in 3 Roundtable discussions to prioritize current opportunities for enhancing and conducting emergency care research. We identify key research questions essential to advancing the science of emergency care and discuss the barriers and strategies to advance research by exploring the collaboration between NIH and the emergency care community. Methods: Experts from emergency medicine, neurology, psychiatry, and public health assembled to review critical areas in need of investigation, current gaps in knowledge, barriers, and opportunities. Neurologic emergencies included cerebral resuscitation, pain, stroke, syncope, traumatic brain injury, and pregnancy. Mental health topics included suicide, agitation and delirium, substances, posttraumatic stress, violence, and bereavement. Results: Presentations and group discussion firmly established the need for translational research to bring basic science concepts into the clinical arena. A coordinated continuum of the health care system that ensures rapid identification and stabilization and extends through discharge is necessary to maximize overall patient outcomes. There is a paucity of well-designed, focused research on diagnostic testing, clinical decisionmaking, and treatments in the emergency setting. Barriers include the limited number of experienced researchers in emergency medicine, limited dedicated research funding, and difficulties of conducting research in chaotic emergency environments stressed by crowding and limited resources. Several themes emerged during the course of the roundtable discussion, including the need for development of (1) a research infrastructure for the rapid identification, consent, and tracking of research subjects that incorporates innovative informatics technologies, essential for future research; (2) diagnostic strategies and tools necessary to understand key populations and the process of medical decisionmaking, including the investigation of the pathobiology of symptoms and symptom-oriented therapies; (3) collaborative research networks to provide unique opportunities to form partnerships, leverage patient cohorts and clinical and financial resources, and share data; (4) formal research training programs integral for creating new knowledge and advancing the science and practice of emergency medicine; and (5) recognition that emergency care is part of an integrated system from emergency medical services dispatch to discharge. The NIH Roundtable “Opportunities to Advance Research on Neurological and Psychiatric Emergencies” created a framework to guide future emergency medicine–based research initiatives. Conclusion: Emergency departments provide the portal of access to the health care system for most patients with acute neurologic and psychiatric illness. Emergency physicians and colleagues are primed to investigate neurologic and psychiatric emergencies that will directly improve the delivery of care and patient outcomes. [Copyright &y& Elsevier]

Abstract: Aim of the review: To review the epidemiology, pathophysiology, treatment and prognostication in relation to the post-cardiac arrest syndrome. Methods: Relevant articles were identified using PubMed, EMBASE and an American Heart Association EndNote master resuscitation reference library, supplemented by hand searches of key papers. Writing groups comprising international experts were assigned to each section. Drafts of the document were circulated to all authors for comment and amendment. Results: The 4 key components of post-cardiac arrest syndrome were identified as (1) post-cardiac arrest brain injury, (2) post-cardiac arrest myocardial dysfunction, (3) systemic ischaemia/reperfusion response, and (4) persistent precipitating pathology. Conclusions: A growing body of knowledge suggests that the individual components of the postcardiac arrest syndrome are potentially treatable. [Copyright &y& Elsevier]

Abstract: Aim of the review: To review the epidemiology, pathophysiology, treatment and prognostication in relation to the post-cardiac arrest syndrome. Methods: Relevant articles were identified using PubMed, EMBASE and an American Heart Association EndNote master resuscitation reference library, supplemented by hand searches of key papers. Writing groups comprising international experts were assigned to each section. Drafts of the document were circulated to all authors for comment and amendment. Results: The 4 key components of post-cardiac arrest syndrome were identified as (1) post-cardiac arrest brain injury, (2) post-cardiac arrest myocardial dysfunction, (3) systemic ischaemia/reperfusion response, and (4) persistent precipitating pathology. Conclusions: A growing body of knowledge suggests that the individual components of the postcardiac arrest syndrome are potentially treatable. [Copyright &y& Elsevier]

Abstract: Objectives: Emergency medical services (EMS) use by stroke patients varies from 38% to 65%. In an epidemiological study, we determined the proportion of stroke patients who used EMS, hypothesizing that demographics, stroke severity, stroke type, and location at stroke onset would be associated with EMS use. Methods: Stroke and transient ischemic attack patients were identified in a population of 1.3 million in the Cincinnati area in 1999. Patient charts and EMS records were abstracted by research nurses and reviewed by study physicians. The proportion of EMS users was computed. Logistic regression was used to test for associations with EMS use. Results: Of 3949 strokes, we excluded strokes/transient ischemic attacks that occurred in the hospital (n = 283), out of town (n = 10), during EMS transport (n = 2), and at unknown locations (n = 73). Patients with unknown EMS use (n = 301); those with missing estimated stroke severity (n = 174), prestroke disability (n = 78), race (n = 3), and stroke type (n = 3); and those younger than 18 years (n = 14) were also excluded. The remaining 3008 patients had a mean age of 74 years, 17% were black, and 45% were men. Emergency medical services was used by 1532 (50.9%) patients. Age, prestroke disability, stroke severity, hemorrhagic stroke, and stroke at work were associated with EMS use. Race, sex, and prior stroke were not associated with EMS use. Conclusion: Half of stroke patients used EMS in our population-based study. Older patients; those with greater prestroke disability, more severe stroke, and hemorrhagic stroke; and those having stroke at work were more likely to use EMS. [Copyright &y& Elsevier]

Abstract: Background: Sex is suggested to be an important determinant of ischemic stroke risk factors, etiology, and outcome. However, the basis for this remains unclear. The Y chromosome is unique in males. Genes expressed in males on the Y chromosome that are associated with stroke may be important genetic contributors to the unique features of males with ischemic stroke, which would be helpful for explaining sex differences observed between men and women. Objective: We compared Y chromosome gene expression in males with ischemic stroke and male controls. Methods: Blood samples were obtained from 40 male patients ≤3, 5, and 24 hours after ischemic stroke and from 41 male controls (July 2003–April 2007). RNA was isolated from blood and was processed using Affymetrix Human U133 Plus 2.0 expression arrays (Affymetrix Inc., Santa Clara, California). Y chromosome genes differentially expressed between male patients with stroke and male control subjects were identified using an ANCOVA adjusted for age and batch. A P < 0.05 and a fold change >1.2 were considered significant. Results: Seven genes on the Y chromosome were differentially expressed in males with ischemic stroke compared with controls. Five of these genes (VAMP7, CSF2RA, SPRY3, DHRSX, and PLCXD1) are located on pseudoautosomal regions of the human Y chromosome. The other 2 genes (EIF1AY and DDX3Y) are located on the nonrecombining region of the human Y chromosome. The identified genes were associated with immunology, RNA metabolism, vesicle fusion, and angiogenesis. Conclusions: Specific genes on the Y chromosome are differentially expressed in blood after ischemic stroke. These genes provide insight into potential molecular contributors to sex differences in ischemic stroke. [Copyright &y& Elsevier]

Summary: Background: The IMS III trial did not show a clinical benefit of endovascular treatment compared with intravenous alteplase (recombinant tissue plasminogen activator) alone for moderate or severe ischaemic strokes. Late reperfusion of tissue that was no longer salvageable could be one explanation, as suggested by previous exploratory studies that showed an association between time to reperfusion and good clinical outcome. We sought to validate this association in a preplanned analysis of data from the IMS III trial. Methods: We used data for patients with complete proximal arterial occlusions in the anterior circulation who received endovascular treatment and achieved angiographic reperfusion (score on Thrombolysis in Cerebral Infarction scale of grade 2–3) during the endovascular procedure (within 7 h of symptom onset). We used logistic regression to model good clinical outcome (defined as a modified Rankin Scale score of 0–2 at 3 months) as a function of the time to reperfusion. We prespecified variables to be considered for adjustment, including age, baseline National Institutes of Health Stroke Scale score, sex, and baseline blood glucose concentration. Findings: Of 240 patients who were otherwise eligible for inclusion in our analysis, 182 (76%) achieved angiographic reperfusion. Mean time from symptom onset to reperfusion (ie, procedure end) was 325 min (SD 52). Increased time to reperfusion was associated with a decreased likelihood of good clinical outcome (unadjusted relative risk for every 30-min delay 0·85 [95% CI 0·77–0·94]; adjusted relative risk 0·88 [0·80–0·98]). Interpretation: Delays in time to angiographic reperfusion lead to a decreased likelihood of good clinical outcome in patients after moderate to severe stroke. Rapid reperfusion could be crucial for the success of future acute endovascular trials. Funding: US National Institutes of Health and National Institute of Neurological Disorders and Stroke. [Copyright &y& Elsevier]

Abstract: Oftentimes valid statistical analyses for clinical trials involve adjustment for known influential covariates, regardless of imbalance observed in these covariates at baseline across treatment groups. Thus, it must be the case that valid interim analyses also properly adjust for these covariates. There are situations, however, in which covariate adjustment is not possible, not planned, or simply carries less merit as it makes inferences less generalizable and less intuitive. In this case, covariate imbalance between treatment groups can have a substantial effect on both interim and final primary outcome analyses. This paper illustrates the effect of influential continuous baseline covariate imbalance on unadjusted conditional power (CP), and thus, on trial decisions based on futility stopping bounds. The robustness of the relationship is illustrated for normal, skewed, and bimodal continuous baseline covariates that are related to a normally distributed primary outcome. Results suggest that unadjusted CP calculations in the presence of influential covariate imbalance require careful interpretation and evaluation. [Copyright &y& Elsevier]

Summary: Aim of the review: To review the epidemiology, pathophysiology, treatment and prognostication in relation to the post-cardiac arrest syndrome. Methods: Relevant articles were identified using PubMed, EMBASE and an American Heart Association EndNote master resuscitation reference library, supplemented by hand searches of key papers. Writing groups comprising international experts were assigned to each section. Drafts of the document were circulated to all authors for comment and amendment. Results: The 4 key components of post-cardiac arrest syndrome were identified as (1) post-cardiac arrest brain injury, (2) post-cardiac arrest myocardial dysfunction, (3) systemic ischaemia/reperfusion response, and (4) persistent precipitating pathology. Conclusions: A growing body of knowledge suggests that the individual components of the post-cardiac arrest syndrome are potentially treatable. [Copyright &y& Elsevier]