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  • Ovid Technologies (Wolters Kluwer Health)  (65)
  • Kang, Kyusik  (65)
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  • Ovid Technologies (Wolters Kluwer Health)  (65)
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  • 1
    Online Resource
    Online Resource
    Leptomeningeal Collaterals and Infarct Progression in Patients With Acute Large‐Vessel Occlusion and Low NIHSS
    Ovid Technologies (Wolters Kluwer Health) ; 2023
    In:  Stroke: Vascular and Interventional Neurology Vol. 3, No. 5 ( 2023-09)
    Details
    In: Stroke: Vascular and Interventional Neurology, Ovid Technologies (Wolters Kluwer Health), Vol. 3, No. 5 ( 2023-09)
    Abstract: Approximately 10% of patients with acute ischemic stroke with large‐vessel occlusion (LVO) have mild neurological deficits. Although leptomeningeal collaterals (LMCs) are the major determinant of clinical outcomes for patients with acute ischemic stroke with LVO, the contribution of baseline LMC status to subsequent infarct progression in patients with mild stroke with LVO is poorly defined. Methods This observational study included patients with acute anterior circulation LVO and mild stroke symptoms (National Institutes of Health Stroke Scale 〈 6) from a prospectively collected, multicenter, national stroke registry. The Alberta Stroke Program Early Computed Tomography Score was quantified on the initial and follow‐up images. An infarct progression, defined as any Alberta Stroke Program Early Computed Tomography Score decrease between the initial versus follow‐up scans, was categorized as either 0/1/2+. The LMCs on the baseline images were graded as good, fair, or poor. Results Of the 623 included patients (mean age, 67.6±13.4 years; 380 [61.0%] men; 186 [29.9%] with reperfusion treatment), the baseline LMC was graded as good in 331 (53.1%), fair in 219 (35.2%), and poor in 73 (11.7%). The Alberta Stroke Program Early Computed Tomography Score decrement was noted as 0 in 288 (46%) patients, 1 in 154 (24%), and 2+ in 181 (29%). A poor LMC was associated with an infarct progression (adjusted odds ratio, 2.05 [95% CI, 1.22–3.47]). Conclusions Poor collateral blood flow was associated with infarct progression in patients with acute ischemic stroke with LVO and mild symptoms. In this selective population, early assessment of collateral blood flow status can help in early detection of patients susceptible to infarct progression.
    Type of Medium: Online Resource
    ISSN: 2694-5746
    URL: Article
    DOI: 10.1161/SVIN.122.000819
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2023
    detail.hit.zdb_id: 3144224-9
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  • 2
    Online Resource
    Online Resource
    Abstract WP98: Utilization Of Perfusion Imaging For Acute Ischemic Stroke: Secular Trends And Effects On Outcomes Of Endovascular Treatment
    Ovid Technologies (Wolters Kluwer Health) ; 2023
    In:  Stroke Vol. 54, No. Suppl_1 ( 2023-02)
    Details
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 54, No. Suppl_1 ( 2023-02)
    Abstract: Introduction: Perfusion imaging (PI) could guide decision-making for endovascular treatment (EVT) of acute ischemic stroke (AIS). However, PI was underused even in the US before the pivotal EVT trials proved its usefulness in 2018. This study aimed to describe the secular trends of PI utilization and investigate the effectiveness of PI-based EVT in real-world practice. Methods: Using a prospective multicenter (n=17) stroke registry in South Korea, we identified patients with AIS who presented within 24 hours from onset between 2011 and 2021. The study period was divided into 3 epochs: 2011-2014, 2015-2017, and 2018-2021. The study population was divided into the early (arrival within 6 hours) and late window (6-24 hours) groups. Results: A total of 51,650 patients (15,654 patients in 2011-2014, 14,432 patients in 2015-2017, and 21,564 patients in 2018-2021) were analyzed. Utilization of PI decreased in the overall population and early window group ( P trend 〈 0.001); 43.3% and 54.1% in 2011-2014, 40.1% and 44.1% in 2015-2017, and 38.4% and 40.2% in 2018-2021, respectively; but increased in the late window group ( P trend 〈 0.001); 31.3% in 2011-2014, 35.7% in 2015-2017, and 36.5% in 2018-2021. Of 10,872 patients with anterior large-vessel occlusion (aLVO), the EVT rate was not different between patients with and without PI (48.7% vs. 46.6%, P =0.08) in the early window but higher in those with PI than without PI in the late window (29.8% vs. 18.7%, P 〈 0.001). The EVT outcome (3-month mRS 0-2) was not different between patients with and without PI in the early window (44.1% vs. 41.8%, P =0.21) and late window (38.4% vs. 39.2%, P =0.81). Propensity score analysis and instrumental variable analysis with PI rate per center as an instrument will be performed to adjust imbalances between patients with and without PI. Conclusion: Between 2011 and 2021 in South Korea, PI utilization has decreased in patients arriving within 6 hours from onset but has increased in those arriving between 6 and 24 hours. Among patients with aLVO, PI likely increased the EVT rate in the late window but did not in the early window. PI utilization did not seem to affect the EVT outcomes, but in-depth analysis is required.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    URL: Article
    DOI: 10.1161/str.54.suppl_1.WP98
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2023
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  • 3
    Online Resource
    Online Resource
    Abstract WMP97: Symptomatic Steno-occlusion Of Major Cerebral Arteries And Stroke Recurrence In Acute Ischemic Stroke Patients With Atrial Fibrillation
    Ovid Technologies (Wolters Kluwer Health) ; 2023
    In:  Stroke Vol. 54, No. Suppl_1 ( 2023-02)
    Details
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 54, No. Suppl_1 ( 2023-02)
    Abstract: Introduction: There is lack of knowledge on whether symptomatic steno-occlusion (SYSO), common in acute ischemic stroke (AIS) patients with atrial fibrillation (AF), could increase the long-term risk of stroke recurrence in these patients. Methods: From a prospective cohort of patients with AIS and AF enrolled in 14 centers between Oct 2017 and Dec 2018, we identified patients who underwent MR angiography during hospitalization and completed 3-year follow-up including death during follow-up. SYSO was defined as (1) ≥ 50% stenosis or occlusion of cerebral arteries relevant to acute infarction or (2) any residual stenosis after endovascular treatment. Using cause-specific hazard models with non-stroke death as a competing risk, the risk of any recurrent stroke and recurrent ischemic stroke was estimated according to SYSO, respectively. Results: A total of 889 patients (mean age, 74.4 years; men, 54.6 %; median NIHSS, 6) were analyzed for this study. During the median 1096 days of follow-up, 152 any recurrent strokes, 142 recurrent ischemic strokes, and 208 deaths were observed. Patients with SYSO, compared to those without, were more likely to be older, be female, have hypertension, diabetes and history of stroke/TIA, and be on antiplatelets at discharge and were less likely to be on anticoagulants at discharge ( p 〈 .05). The cumulative incidence of recurrent stroke in patients with and without SYSO was 25.2% and 8.3% at 1 month, 33.1% and 9.9% at 1 year, and 41.8% and 13.1% at 3 years, respectively ( p 〈 .001). With adjusting age, sex, hypertension, diabetes, history of stroke/TIA, discharge antiplatelets, and discharge anticoagulants, SYSO increased the risk of any stroke recurrence (adjusted hazard ratio [95% confidence interval]; 3.02 [2.18-4.20] ; p 〈 .001) and ischemic stroke recurrence (3.20 [2.28-4.51]; p 〈 .001). Conclusions: SYSO in AIS patients with AF substantially increased the risk of recurrent stroke by a 3-fold or more. Accordingly, SYSO should be considered in stratifying the risk of recurrence in AIS patients with AF.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    URL: Article
    DOI: 10.1161/str.54.suppl_1.WMP97
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2023
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  • 4
    Online Resource
    Online Resource
    David G. Sherman Lecture Award: 15-Year Experience of the Nationwide Multicenter Stroke Registry in Korea
    Ovid Technologies (Wolters Kluwer Health) ; 2022
    In:  Stroke Vol. 53, No. 9 ( 2022-09), p. 2976-2987
    Details
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 53, No. 9 ( 2022-09), p. 2976-2987
    Abstract: The expected growth of stroke burden in Korea in early 2000s led to the initiation of a government-funded clinical research project with the goal of development and implementation of national stroke guidelines. The CRCS-K (Clinical Research Collaboration for Stroke in Korea) began as a part of this project. For stroke epidemiology and quality of care research, the CRCS-K developed a multicenter, prospective, stroke registry and began collection of data in 2008. Now, about 100 000 cases have been registered at 17 university hospitals or regional stroke centers and about 200 articles have been published based on the registry experience. The analysis of the 10-year secular trends showed overall improvement of stroke care and outcomes and areas for improvement. This large-scale, high-quality dataset provides opportunities to explore and compare treatment disparities using the comparative effectiveness research methods, design and conduct a registry-based randomized clinical trial, connect the registry data with other data sources including the national claims data and neuroimaging or genetic data, and collaborate with other international researchers. An international stroke registry consortium may be a viable future direction.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    URL: Article
    DOI: 10.1161/STROKEAHA.122.039212
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2022
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  • 5
    Online Resource
    Online Resource
    Abstract WP100: Trends in the Utilization of Intravenous Thrombolysis for Ischemic Stroke in Korea From 2013 to 2022
    Ovid Technologies (Wolters Kluwer Health) ; 2024
    In:  Stroke Vol. 55, No. Suppl_1 ( 2024-02)
    Details
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 55, No. Suppl_1 ( 2024-02)
    Abstract: Introduction: IV thrombolysis is a proven treatment for acute ischemic stroke (AIS), but it is still underutilized in real-world clinical practice. Using a nationwide multicenter stroke registry, we aimed to determine whether there are significant trends in the rate of IV thrombolysis in different patient populations. Methods: This study assessed patients with AIS or transient ischemic attack (TIA) registered prospectively in the Clinical Research Center for Stroke-Korea (CRCS-K) registry between 2013 and 2022. Trends in IV thrombolysis rate were respectively analyzed for all patients (cohort 1), patients who arrived at the hospital within 4.5 hours of onset (cohort 2), and patients potentially eligible for IV thrombolysis (cohort 3), using joinpoint regression analysis. Trends in IV thrombolysis rates in cohorts 1-3 were further investigated using generalized linear mixed-effects models adjusted for patient characteristics and accounting for hospital heterogeneity. Results: A total of 76535 patients were included in the analysis. The mean age of the patients increased from 67.3 to 69.8 years, and the median time from onset to hospital arrival increased over the 10-year period. During the study period, proportion of patients arriving at the hospital within 4.5 hours of onset and the proportion of patients potentially eligible for IV thrombolysis decreased, especially after 2016. IV thrombolysis rates significantly declined over the 10-year period in cohorts 1-3, with a pronounced decrease in the treatment rate in potentially IV thrombolysis eligible patients from 2013 to 2016 (average annual percent change [95% CI] -4.55% [-5.66% to -3.46%] in cohort 1; -2.63% [-3.95% to -1.34%] in cohort 2; -1.33% [-2.06% to -0.49%] in cohort 3). In the multivariable model, patients who arrived in 2022 were less likely to receive IV thrombolysis compared to patients who arrived in 2013 (adjusted odds ratio [95% CI], 0.83 [0.75 - 0.93] ). Conclusions: Utilization of IV thrombolysis has declined over the decade in Korea, even accounting for the decline in the number of patients who are candidates for the treatment. Urgent interventions to increase IV thrombolysis rates are needed to improve acute stroke care.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    URL: Article
    DOI: 10.1161/str.55.suppl_1.WP100
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2024
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  • 6
    Online Resource
    Online Resource
    Hemispheric Asymmetry of White Matter Hyperintensity in Association With Lacunar Infarction
    Ovid Technologies (Wolters Kluwer Health) ; 2018
    In:  Journal of the American Heart Association Vol. 7, No. 22 ( 2018-11-20)
    Details
    In: Journal of the American Heart Association, Ovid Technologies (Wolters Kluwer Health), Vol. 7, No. 22 ( 2018-11-20)
    Abstract: White matter hyperintensities ( WMHs ) are commonly asymmetric between hemispheres but for unknown reasons. We investigated asymmetric WMHs associated with lacunar infarcts. Methods and Results A total of 267 consecutive patients with small first‐ever supratentorial infarcts (≤20 mm) were included. None had a relevant vascular stenosis. WMH asymmetry was measured based on the hemispheric difference of a modified Scheltens scale score (≥3 defined as asymmetric). We analyzed the association of the hemispheric WMH asymmetry with old silent lacunar infarcts or acute lacunar infarcts. We compared lesion frequency maps between groups and generated t‐statistics maps. The mean age of patients was 64 years, and 63% were men. Asymmetric WMH was more than 3‐fold as frequent ( P 〈 0.001) in the group with old silent lacunar infarcts (42%, 43/102) than in the group without old silent lacunar infarcts (15%, 24/165). In patients with left hemispheric dominance of WMHs , an acute lacunar infarct was more likely to be located in the left (versus right) hemisphere (74% versus 26%, P 〈 0.001). In patients with right hemispheric dominance of WMHs , an acute lacunar infarct was more likely to be located on the right (versus left) hemisphere (81% versus 19%, P 〈 0.001). Mapping studies showed that the side of hemispheric dominance of WMHs was associated with acute and silent lacunes on the same side. Conclusions These are the first data to show that asymmetric WMH s are associated with both old silent lacunar infarcts and acute lacunar infarcts ipsilateral to the greatest WMH burden. This suggests that the hemisphere with relatively large WMHs is more vulnerable to ischemia.
    Type of Medium: Online Resource
    ISSN: 2047-9980
    URL: Article
    DOI: 10.1161/JAHA.118.010653
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2018
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  • 7
    Online Resource
    Online Resource
    Grading and Interpretation of White Matter Hyperintensities Using Statistical Maps
    Ovid Technologies (Wolters Kluwer Health) ; 2014
    In:  Stroke Vol. 45, No. 12 ( 2014-12), p. 3567-3575
    Details
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 45, No. 12 ( 2014-12), p. 3567-3575
    Abstract: We aimed to generate rigorous graphical and statistical reference data based on volumetric measurements for assessing the relative severity of white matter hyperintensities (WMHs) in patients with stroke. Methods— We prospectively mapped WMHs from 2699 patients with first-ever ischemic stroke (mean age=66.8±13.0 years) enrolled consecutively from 11 nationwide stroke centers, from patient (fluid-attenuated-inversion-recovery) MRIs onto a standard brain template set. Using multivariable analyses, we assessed the impact of major (age/hypertension) and minor risk factors on WMH variability. Results— We have produced a large reference data library showing the location and quantity of WMHs as topographical frequency-volume maps. This easy-to-use graphical reference data set allows the quantitative estimation of the severity of WMH as a percentile rank score. For all patients (median age=69 years), multivariable analysis showed that age, hypertension, atrial fibrillation, and left ventricular hypertrophy were independently associated with increasing WMH (0–9.4%, median=0.6%, of the measured brain volume). For younger (≤69) hypertensives (n=819), age and left ventricular hypertrophy were positively associated with WMH. For older (≥70) hypertensives (n=944), age and cholesterol had positive relationships with WMH, whereas diabetes mellitus, hyperlipidemia, and atrial fibrillation had negative relationships with WMH. For younger nonhypertensives (n=578), age and diabetes mellitus were positively related to WMH. For older nonhypertensives (n=328), only age was positively associated with WMH. Conclusions— We have generated a novel graphical WMH grading (Kim statistical WMH scoring) system, correlated to risk factors and adjusted for age/hypertension. Further studies are required to confirm whether the combined data set allows grading of WMH burden in individual patients and a tailored patient-specific interpretation in ischemic stroke-related clinical practice.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    URL: Article
    DOI: 10.1161/STROKEAHA.114.006662
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2014
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  • 8
    Online Resource
    Online Resource
    Abstract 2876: Factors Associated with Transient Symptoms in Ischemic Stroke
    Ovid Technologies (Wolters Kluwer Health) ; 2012
    In:  Stroke Vol. 43, No. suppl_1 ( 2012-02)
    Details
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 43, No. suppl_1 ( 2012-02)
    Abstract: Background and Purpose: There may be no qualitative difference of the causes and risk factors between transient symptoms with infarction (TSI) on diffusion weighted images and ischemic stroke. However, it is uncertain for baseline characteristics which associate with transient symptoms in ischemic stroke. We compared the clinical profiles of patients with TSI with those with ischemic stroke. Methods: Consecutive patients presented within 24 hours of ischemic stroke onset with diffusion abnormalities between April 2008 and March 2011 were identified from a nationwide multicenter prospective stroke registry. Clinical profiles including risk factors, medication histories, laboratory findings, and stroke subtypes according to Trial of ORG 10172 in Acute Stroke Treatment criteria were compared between patients with TSI and those with ischemic stroke. Results: A total of 6,766 patients were identified, of whom 226 (3.3%) had TSI. In both univariate and multivariate analyses, younger age (62.1±12.0 vs. 67.8±12.7 [mean±SD]; β=-0.027, p 〈 0.001), occurrence during activity (90.3 vs. 72%; β=1.123, p 〈 0.001), more history of TIA (15 vs 2.4%; β=1.952, p 〈 0.001), less history of stroke (14.6 vs. 22.2%; β=-0.483, p=0.007), less diabetes mellitus (20.4 vs. 30.6%, β=-0.503, p=0.001), and more cryptogenic stroke (21.7 vs. 8.2%; β=0.831, p 〈 0.001) were associated with TSI. Prestroke use of statin or antiplatelet agents, prothrombin time, and platelet count were not associated with TSI. However, TSI patients were more likely to be on anti-coagulants (β=0.791, p=0.007) despite less likelihood of history of atrial fibrillation (β=-0.631, p=0.004) in multivariate analysis. Conclusions: TSI differs from ischemic stroke in various initial clinical aspects. Further study is needed to determine whether these different clinical features affect higher early risk of recurrence of stroke in TSI.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    URL: Article
    DOI: 10.1161/str.43.suppl_1.A2876
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2012
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  • 9
    Online Resource
    Online Resource
    Three-month modified Rankin Scale as a determinant of 5-year cumulative costs after ischemic stroke : An analysis of 11,136 patients in Korea
    Ovid Technologies (Wolters Kluwer Health) ; 2020
    In:  Neurology Vol. 94, No. 9 ( 2020-03-03), p. e978-e991
    Details
    In: Neurology, Ovid Technologies (Wolters Kluwer Health), Vol. 94, No. 9 ( 2020-03-03), p. e978-e991
    Abstract: Stroke is a devastating and costly disease; however, there is a paucity of information on long-term costs and on how they differ according to 3-month modified Rankin scale (mRS) score, which is a primary outcome variable in acute stroke intervention trials. Methods We analyzed a prospective multicenter stroke registry (Clinical Research Collaboration for Stroke in Korea) database through linkage with claims data from the National Health Insurance Service with follow-up to December 2016. Healthcare expenditures were converted into daily cost individually, and annual and cumulative costs up to 5 years were estimated and compared according to the 3-month mRS score. Results Between January 2011 and November 2013, 11,136 patients were enrolled in the study. The mean age was 68 years, and 58% were men. The median follow-up period was 3.9 years (range 0–5 years). Mean cumulative cost over 5 years was $117,576 (US dollars [USD]); the cost in the first year after stroke was the highest ($38,152 USD), which increased markedly from the cost a year before stroke ($8,718 USD). The mean 5-year cumulative costs differed significantly according to the 3-month mRS score ( p 〈 0.001); the costs for a 3-month mRS score of 0 or 5 were $53,578 and $257,486 USD, respectively. Three-month mRS score was an independent determinant of long-term costs after stroke. Conclusions We show that 3-month mRS score plays an important role in the prediction of long-term costs after stroke. Such estimates relating to 3-month mRS categories may be valuable when undertaking health economic evaluations related to stroke care.
    Type of Medium: Online Resource
    ISSN: 0028-3878 , 1526-632X
    URL: Article
    DOI: 10.1212/WNL.0000000000009034
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2020
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  • 10
    Online Resource
    Online Resource
    Effect of the Number of Neurointerventionalists on Off‐Hour Endovascular Therapy for Acute Ischemic Stroke Within 12 Hours of Symptom Onset
    Ovid Technologies (Wolters Kluwer Health) ; 2019
    In:  Journal of the American Heart Association Vol. 8, No. 21 ( 2019-11-05)
    Details
    In: Journal of the American Heart Association, Ovid Technologies (Wolters Kluwer Health), Vol. 8, No. 21 ( 2019-11-05)
    Abstract: Off‐hour presentation can affect treatment delay and clinical outcomes in endovascular therapy ( EVT ) for acute ischemic stroke. We aimed to examine the treatment delays and clinical outcomes of EVT between on‐ and off‐hour admission and to evaluate the effect of hospital procedure volume and the number of neurointerventionalists on off‐hour EVT . Methods and Results From a multicenter registry, we identified patients who were treated with EVT within 12 hours of symptom. Annual hospital procedure volume was divided as low ( 〈 30), medium (30–60), and high ( 〉 60). The effect of the number of neurointerventionalists and annual hospital procedure volume on clinical outcome was estimated by the generalized estimation equation. Of the 31 133 stroke patients, 1564 patients met the eligibility criteria (mean age: 69±12 years; median baseline National Institutes of Health stroke scale score, 15 [interquartile range, 10–19]). Of 1564 patients, 893 (57.1%) arrived during off‐hour. The off‐hour patients had greater median door‐to‐puncture time (110  versus 95 minutes; P 〈 0.001) compared with on‐hour patients. Despite the treatment delay, the functional outcome at 3 months did not differ between off‐ and on‐hour (odds ratio with 95% CI for 3‐month modified Rankin Scale 0–2, 0.99 [0.78–1.25]; P =0.90). The presence of three neurointerventionalists was significantly associated with favorable outcomes at 3 months during on‐ and off‐hour (2.07 [1.53–2.81]; P 〈 0.001). The association was not observed for annual hospital procedural volume and the functional outcomes. Conclusions The number of neurointerventionalists was more crucial to effective around‐the‐clock EVT for acute stroke patients than hospital procedural volume.
    Type of Medium: Online Resource
    ISSN: 2047-9980
    URL: Article
    DOI: 10.1161/JAHA.119.011933
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2019
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