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  • 1
    In: JAMA, American Medical Association (AMA), Vol. 327, No. 18 ( 2022-05-10), p. 1782-
    Kurzfassung: In nonurban areas with limited access to thrombectomy-capable centers, optimal prehospital transport strategies in patients with suspected large-vessel occlusion stroke are unknown. Objective To determine whether, in nonurban areas, direct transport to a thrombectomy-capable center is beneficial compared with transport to the closest local stroke center. Design, Setting, and Participants Multicenter, population-based, cluster-randomized trial including 1401 patients with suspected acute large-vessel occlusion stroke attended by emergency medical services in areas where the closest local stroke center was not capable of performing thrombectomy in Catalonia, Spain, between March 2017 and June 2020. The date of final follow-up was September 2020. Interventions Transportation to a thrombectomy-capable center (n = 688) or the closest local stroke center (n = 713). Main Outcomes and Measures The primary outcome was disability at 90 days based on the modified Rankin Scale (mRS; scores range from 0 [no symptoms] to 6 [death] ) in the target population of patients with ischemic stroke. There were 11 secondary outcomes, including rate of intravenous tissue plasminogen activator administration and thrombectomy in the target population and 90-day mortality in the safety population of all randomized patients. Results Enrollment was halted for futility following a second interim analysis. The 1401 enrolled patients were included in the safety analysis, of whom 1369 (98%) consented to participate and were included in the as-randomized analysis (56% men; median age, 75 [IQR, 65-83] years; median National Institutes of Health Stroke Scale score, 17 [IQR, 11-21] ); 949 (69%) comprised the target ischemic stroke population included in the primary analysis. For the primary outcome in the target population, median mRS score was 3 (IQR, 2-5) vs 3 (IQR, 2-5) (adjusted common odds ratio [OR], 1.03; 95% CI, 0.82-1.29). Of 11 reported secondary outcomes, 8 showed no significant difference. Compared with patients first transported to local stroke centers, patients directly transported to thrombectomy-capable centers had significantly lower odds of receiving intravenous tissue plasminogen activator (in the target population, 229/482 [47.5%] vs 282/467 [60.4%]; OR, 0.59; 95% CI, 0.45-0.76) and significantly higher odds of receiving thrombectomy (in the target population, 235/482 [48.8%] vs 184/467 [39.4%]; OR, 1.46; 95% CI, 1.13-1.89). Mortality at 90 days in the safety population was not significantly different between groups (188/688 [27.3%] vs 194/713 [27.2%]; adjusted hazard ratio, 0.97; 95% CI, 0.79-1.18). Conclusions and Relevance In nonurban areas in Catalonia, Spain, there was no significant difference in 90-day neurological outcomes between transportation to a local stroke center vs a thrombectomy-capable referral center in patients with suspected large-vessel occlusion stroke. These findings require replication in other settings. Trial Registration ClinicalTrials.gov Identifier: NCT02795962
    Materialart: Online-Ressource
    ISSN: 0098-7484
    RVK:
    Sprache: Englisch
    Verlag: American Medical Association (AMA)
    Publikationsdatum: 2022
    ZDB Id: 2958-0
    ZDB Id: 2018410-4
    SSG: 5,21
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 54, No. Suppl_1 ( 2023-02)
    Kurzfassung: Objective: To assess whether the effect of intravenous thrombolysis in patients with large-vessel occlusion differed between patients directly admitted to thrombectomy-capable centers and patients transferred from local stroke centers without thrombectomy capabilities. Methods: We included 3206 patients with an acute ischemic large-vessel stroke with first imaging within 7 hours after onset that were directly admitted to thrombectomy-capable centers and treated with thrombectomy, or transferred from local stroke centers for thrombectomy evaluation, between 2017 and 2021 in Catalonia, Spain. Primary outcome was the degree of disability at 90 days, as evaluated by the shift analysis on the mRs score. Secondary outcomes included mortality at 90 days and the rate of parenchymal hemorrhage and successful reperfusion. Inverse-probability weighting clustered at the type of stroke center was used to estimate the effects. Results: The analysis included 2268 patients (975[49%] treated with thrombolysis) directly admitted to thrombectomy-capable centers and 938 patients (580[66%] treated with thrombolysis and 616[67%] treated with thrombectomy) transferred from local stroke centers (mean age 72±13 years, median NIHSS score 17[IQR 12-21] , 1363 female[48%]). Patients treated with intravenous thrombolysis were younger, had shorter time from onset to first image acquisition, and higher rates of wake-up stroke, atrial fibrillation and anticoagulation intake. The effect of intravenous thrombolysis on the primary outcome was similar in patients directly admitted to thrombectomy-capable centers (acOR 1.50, 95% CI 1.24-1.81) and patients transferred from local stroke centers (acOR 1.44, 95% CI 1.04 to 2.01)(p interaction =0.68). Patients treated with intravenous thrombolysis had lower mortality rate, higher rate of parenchymal hematoma and similar rate of successful reperfusion, with no difference according to type of center (p interaction 〉 0.1). Conclusion: Administration of intravenous thrombolysis in patients with a large-vessel stroke with intention to thrombectomy was associated with higher odds of good functional outcome and higher rates of parenchymal hematoma, independently of the type of stroke center were it was administered.
    Materialart: Online-Ressource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2023
    ZDB Id: 1467823-8
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 54, No. 3 ( 2023-03), p. 770-780
    Kurzfassung: We aim to assess whether time of day modified the treatment effect in the RACECAT trial (Direct Transfer to an Endovascular Center Compared to Transfer to the Closest Stroke Center in Acute Stroke Patients With Suspected Large Vessel Occlusion Trial), a cluster-randomized trial that did not demonstrate the benefit of direct transportation to a thrombectomy-capable center versus nearest local stroke center for patients with a suspected large vessel stroke triaged in nonurban Catalonia between March 2017 and June 2020. Methods: We performed a post hoc analysis of RACECAT to evaluate if the association between initial transport routing and functional outcome differed according to trial enrollment time: daytime (8:00 am –8:59 pm ) and nighttime (9:00 pm –7:59 am ). Primary outcome was disability at 90 days, as assessed by the shift analysis on the modified Rankin Scale score, in patients with ischemic stroke. Subgroup analyses according to stroke subtype were evaluated. Results: We included 949 patients with an ischemic stroke, of whom 258 patients(27%) were enrolled during nighttime. Among patients enrolled during nighttime, direct transport to a thrombectomy-capable center was associated with lower degrees of disability at 90 days (adjusted common odds ratio [acOR] , 1.620 [95% CI, 1.020–2.551]); no significant difference between trial groups was present during daytime (acOR, 0.890 [95% CI, 0.680–1.163] ; P interaction =0.014). Influence of nighttime on the treatment effect was only evident in patients with large vessel occlusion(daytime, acOR 0.766 [95% CI, 0.548–1.072]; nighttime, acOR, 1.785 [95% CI, 1.024–3.112] ; P interaction 〈 0.01); no heterogeneity was observed for other stroke subtypes ( P interaction 〉 0.1 for all comparisons). We observed longer delays in alteplase administration, interhospital transfers, and mechanical thrombectomy initiation during nighttime in patients allocated to local stroke centers. Conclusions: Among patients evaluated during nighttime for a suspected acute severe stroke in non-urban areas of Catalonia, direct transport to a thrombectomy-capable center was associated with lower degrees of disability at 90 days. This association was only evident in patients with confirmed large vessel occlusion on vascular imaging. Time delays in alteplase administration and interhospital transfers might mediate the observed differences in clinical outcome. Registration: URL: https://www.clinicaltrials.gov ; Unique identifier: NCT02795962.
    Materialart: Online-Ressource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2023
    ZDB Id: 1467823-8
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 53, No. Suppl_1 ( 2022-02)
    Kurzfassung: Introduction: Our objective is to identify thrombus composition associated with first pass recanalization (FPR) in mechanical thrombectomy (MT). Methods: Intracranial thrombi obtained in MT were divided in two equal parts. One part was analyzed with anatomopathological studies to quantify fibrin, red-blood cell( Hematoxilin & Eosin) and platelets( cd61 Immunohistochemical staining ) , the other part was analyzed by flow cytometry to quantify leukocyte populations (granulocytes, lymphocytes and monocytes) and their relative proportions . FPR were defined as ≥ mTICI 2b after first pass in MT. Thrombi composition, baseline variables (demographics, previos use of antiplatelets or anticoagulants, blood pressure and blood glucose at hospital arrival ) etiology, intravenous fibrinolysis, ASPECTS score and first attempt thrombectomy devices: direct aspiration, stent retriever or combinations were compared between FPR and Non-FPR groups. Results: Fifty percent (38/76) of the cases analyzed obtained FPR. There were no differences in baseline variables , etiology, Aspects score, previous use of fibrinolysis or type of device used for MT. The thrombi obtained with FPR presented higher proportion of red blood cells (33.64% vs 18.16% p = 0.048) and lymphocytes (10.07% vs 4.43% p = 0.042) and lower proportion of platelets (61, 48% vs 67.26% p = 0.042) in comparison to non-FPR group. The proportion of platelets was an independent marker of FPR (OR 0.97; CI 0.95-0.99). There was an inverse correlation between the proportion of platelets and lymphocytes (rho -0.44, p 〈 0.001). Conclusion: Platelets proportion in intracranial thrombus is an independent marker of first pass recanalization. Inverse relationship between lymphocytes and platelets may be a target for future reperfusion treatments
    Materialart: Online-Ressource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2022
    ZDB Id: 1467823-8
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    In: Translational Stroke Research, Springer Science and Business Media LLC, Vol. 13, No. 6 ( 2022-12), p. 949-958
    Materialart: Online-Ressource
    ISSN: 1868-4483 , 1868-601X
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2022
    ZDB Id: 2541897-X
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    In: Neurotherapeutics, Springer Science and Business Media LLC, Vol. 20, No. 4 ( 2023-07), p. 1167-1176
    Kurzfassung: We aim to identify a profile of intracranial thrombus resistant to recanalization by mechanical thrombectomy (MT) in acute stroke treatment. The first extracted clot of each MT was analyzed by flow cytometry obtaining the composition of the main leukocyte populations: granulocytes, monocytes, and lymphocytes. Demographics, reperfusion treatment, and grade of recanalization were registered. MT failure (MTF) was defined as final thrombolysis in cerebral infarction score IIa or lower and/or need of permanent intracranial stenting as a rescue therapy. To explore the relationship between stiffness of intracranial clots and cellular composition, unconfined compression tests were performed in other cohorts of cases. Thrombi obtained in 225 patients were analyzed. MTF were observed in 30 cases (13%). MTF was associated with atherosclerosis etiology (33.3% vs. 15.9%; p  = 0.021) and higher number of passes (3 vs. 2; p   〈  0.001). Clot analysis of MTF showed higher percentage of granulocytes [82.46 vs. 68.90% p   〈  0.001] and lower percentage of monocytes [9.18% vs.17.34%, p   〈  0.001] in comparison to successful MT cases. The proportio n of clot granulocytes (aOR 1.07; 95% CI 1.01–1.14) remained an independent marker of MTF. Among thirty-eight clots mechanically tested, there was a positive correlation between granulocyte proportion and thrombi stiffness (Pearson’s r  = 0.35, p  = 0.032), with a median clot stiffness of 30.2 (IQR, 18.9–42.7) kPa. Granulocytes-rich thrombi are harder to capture by mechanical thrombectomy due to increased stiffness, so a proportion of intracranial granulocytes might be useful to guide personalized endovascular procedures in acute stroke treatment.
    Materialart: Online-Ressource
    ISSN: 1933-7213 , 1878-7479
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2023
    ZDB Id: 2279496-7
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 54, No. Suppl_1 ( 2023-02)
    Kurzfassung: Hypothesis: We aim to identify a profile of intracranial thrombus resistant to recanalization by standard mechanical thrombectomy (MT) in acute stroke treatment. Methods: First extracted clot of each MT were analyzed by Flow Cytometry obtaining composition of main leukocyte populations: granulocytes, monocytes and lymphocytes. Demographics, reperfusion treatment and grade of recanalization were registered. MT Failure ( MTF) was defined as final Thrombolysis in Cerebral Infarction score IIa or lower and/ or need of permanent intracranial stenting as a rescue therapy after standard MT. In other cohort of cases, unconfined compression tests were performed to explore stiffness of retrieved clots . We looked for correlation between mechanical characterization tests and clot composition. Results: Among 225 patients, there were 13 % of MTF that were significantly associated to atherosclerosis etiology ( 33.3% vs. 15.9% ; p 0.021) , more passes ( 3 vs. 2; p 〈 0.001), higher proportion of clot granulocytes ( 82.46% vs. 68.90% ; p 〈 0.001) and lower proportion of clot monocytes ( 9.18% vs.17.34% ; p 〈 0.001). The proportion of clot granulocytes (aOR 1.07; 95% CI 1.01-1.14) remained as an independent marker of MTF. Among Thirty eight clots tested by unconfined compression median clot stiffness was 30.2 (IQR, 18.9-42.7) kPa. There was a positive correlation between granulocyte proportion and thrombi stiffness (Pearson’s r=0.35, p=0.032). Conclusions: There is a positive correlation between granulocyte proportion and thrombi stiffness that may explain endovascular resistance to recanalization. Influence of granulocytes within thrombus may be a target for future reperfusion treatments.
    Materialart: Online-Ressource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2023
    ZDB Id: 1467823-8
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 52, No. Suppl_1 ( 2021-03)
    Kurzfassung: Methods: We analyzed data from 190 patients in a prospective unicentric study. Thrombi obtained in emergent endovascular treatment ( EVT) were analyzed by MFC order to calculate the percentage of granulocytes , monocytes and lymphocytes, over total leukocyte population as well as monocyte-to-lymphocyte ratio ( MLR) Clinical and interventional parameters were recorded for each patient. Stroke subtypes were defined by the Trial of ORG 10172 in Acute Stroke Treatment classification. We tested MFC predictors of high risk cardioembolic strokes (HR CE) in patients with undetermined stroke etiology . MFC predictor was obtained by comparison of clots due to Large Arterial Atherosclerosis compared with clots due to HR CE. Results: Among 190 clots retrieved, 163 cases were properly analized. 91 cases with known stroke etiology after EVT and 72 cases of Undetermined stroke. In a demographic (age, gender) and EVT matched (time, tpa, number of passes) case -control study of 56 patients: HR CE strokes (28 cases) and LAA strokes (28 cases), the proportion of monocytes ( OR 1.06 , 95% CI 1.01- 1.11) and MLR ( OR 1.83 , 95% CI 1.12- 2.98) independently predicted HR CE detection. A cut-off point of 1.77% in a receiver operating characteristic curve predicted cardiomebolic etiology with sensitivity of 71% and specificity of 82%. Among Undetermined Strokes (n=72) the percentage of HR CE detection was higher in patients with high MLR (n=40 ; 74%) compared with low MLR (n=6; 33%) ( p 〈 0.001). Patients with high MLR were older than low MLR cases, although MLR 〉 1.77 independently predicted HR CE detection among Undetermined strokes (OR, 4.50 ,95% CI 1.35-15.04) in a multivariate model adjusted for age. Conclusion: Measurement of monocyte to lymphocyte ratio in clots by multiparametric flow cytometry detected patients at high risk of hidden cardioembolic origin among undetermined stroke population.
    Materialart: Online-Ressource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2021
    ZDB Id: 1467823-8
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    In: Stroke: Vascular and Interventional Neurology, Ovid Technologies (Wolters Kluwer Health), Vol. 3, No. S2 ( 2023-11)
    Kurzfassung: In stroke patients, accurate infarct volume assessment at 24 hours typically requires manual segmentation of lesions that often are not well defined. We aimed to validate an automated machine learning algorithm (MethinksFIV) specifically trained to automatically segment and measure subacute infarcts on non‐contrast CT (NCCT) scans. Methods We retrospectively studied stroke patients with a large vessel occlusion prospectively admitted to a comprehensive stroke center. The final infarct volume was segmented on the 24h NCCT manually (man‐FIV) and with the automated method (auto‐FIV). Both measurements were correlated with clinical outcomes. Results We included 346 patients. On 24h‐NCCT median auto‐FIV was lower than man‐FIV (8.6 ml [2.3‐40.7] vs. 16.9 ml [1.1‐70.8] , p 〈 0.001). Auto‐FIV and man‐FIV were highly correlated (r=0.8; p 〈 0.001; mean dice coefficient of 0.61). The Auto‐FIV correlated better than man‐FIV with 24h (r=0.54 vs. r=0.51, both p 〈 0.001) and discharge NIHSS (r=0.59 vs r=0.54, both p 〈 0.001). An increase of 1 ml in auto‐FIV was associated with an increase in the odds of higher ordinal mRS at three months (OR=1.01 95%CI 1.01‐1.02, p 〈 0.001). Auto‐FIV was a better predictor of mRS 〉 2 at three months (OR: 1.02 95%CI 1.01‐1.13, p=0.002) than manual segmentation (OR=1.01, 95%CI 1.00‐1.01, p=0.01). In a multivariable analysis, only auto‐FIV remained a significant predictor of mRS 〉 2 at three months (aOR: 1.03 95% CI 1.01‐1.05, p=0.004). Conclusion An automated method to measure subacute infarct volumes in stroke patients is accurate and correlates well with further clinical outcomes. The method appears to outperform manual segmentation and may be used to facilitate infarct characterization in large clinical trials.
    Materialart: Online-Ressource
    ISSN: 2694-5746
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2023
    ZDB Id: 3144224-9
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 53, No. Suppl_1 ( 2022-02)
    Kurzfassung: Background: Endovascular treatment (EVT) for acute ischemic stroke (AIS) between 6 to 24 hours is established as a standard of care among patients selected by multiparametric neuroimaging. Therefore, we aimed to explore neuroimaging parameters in late window AIS large vessel occlusion (LVO) patients and the association between findings in non-contrast computed tomography (NCCT) and multiparametric CT. Methods: We included consecutive AIS patients within 6-24 hours from symptoms onset with CTA-LVO. We studied potential associations between computed tomography mismatch defined by DAWN and/or DEFUSE-3 neuroimaging criteria (CTP-MM), infarct volume on CTP, and ASPECTS on NCCT. We also analyzed the association between neuroimaging parameters and outcome determined by 90-day mRS. Results: We included 206 patients, of which 176 (85.4%) presented CTP-MM and 184 (89.3%) presented with an ASPECTS ≥ 6 on admission. The rate of CTP-MM was 90.8% in patients with ASPECTS ≥ 6, as compared with 40.9% in those with low ASPECTS [Figure 1A] . The ASPECTS correlated with infarct core, determined by Cerebral Blood Flow 〈 30% volume (rP=-0.575, P 〈 0.001). In EVT-treated patients (185, 89.8%), after adjusting for identifiable confounders, the presence of CTP-MM was a predictor of 90-day functional independence (OR 3.38; 95%CI 1.01-11.29; P=0.048). We did not find an association between CTP-MM and 90-day functional disability (ordinal mRS shift, aOR 1.39; 95% CI 0.58-3.34; P=0.459) [Figure 1B] . Conclusions: A great majority of patients who presented a LVO in late window fulfilled guidelines imaging criteria to undergo EVT, especially those with high ASPECTS (≥ 6). Our data suggest that NCCT with CT angiography is a reasonable approach for acute ischemic stroke treatment selection also in the late window.
    Materialart: Online-Ressource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2022
    ZDB Id: 1467823-8
    Standort Signatur Einschränkungen Verfügbarkeit
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