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  • 1
    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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  • 2
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 53, No. 12 ( 2022-12), p. 3728-3740
    Kurzfassung: We aim to compare the outcome of patients from urban areas, where the referral center is able to perform thrombectomy, with patients from nonurban areas enrolled 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). Methods: Patients with suspected large vessel occlusion stroke, as evaluated by a Rapid Arterial Occlusion Evaluation score of ≥5, from urban catchment areas of thrombectomy-capable centers during RACECAT trial enrollment period were included in the Stroke Code Registry of Catalonia. Primary outcome was disability at 90 days, as assessed by the shift analysis on the modified Rankin Scale score, in patients with an ischemic stroke. Secondary outcomes included mortality at 90 days, rate of thrombolysis and thrombectomy, time from onset to thrombolysis, and thrombectomy initiation. Propensity score matching was used to assemble a cohort of patients with similar characteristics. Results: The analysis included 1369 patients from nonurban areas and 2502 patients from urban areas. We matched 920 patients with an ischemic stroke from urban areas and nonurban areas based on their propensity scores. Patients with ischemic stroke from nonurban areas had higher degrees of disability at 90 days (median [interquartle range] modified Rankin Scale score, 3 [2–5] versus 3 [1–5], common odds ratio, 1.25 [95% CI, 1.06–1.48] ); the observed average effect was only significant in patients with large vessel stroke (common odds ratio, 1.36 [95% CI, 1.08–1.65]). Mortality rate was similar between groups(odds ratio, 1.02 [95% CI, 0.81–1.28] ). Patients from nonurban areas had higher odds of receiving thrombolysis (odds ratio, 1.36 [95% CI, 1.16–1.67]), lower odds of receiving thrombectomy(odds ratio, 0.61 [95% CI, 0.51–0.75] ), and longer time from stroke onset to thrombolysis (mean difference 38 minutes [95% CI, 25–52]) and thrombectomy(mean difference 66 minutes [95% CI, 37–95] ). Conclusions: In Catalonia, Spain, patients with large vessel occlusion stroke triaged in nonurban areas had worse neurological outcomes than patients from urban areas, where the referral center was able to perform thrombectomy. Interventions aimed at improving organizational practices and the development of thrombectomy capabilities in centers located in remote areas should be pursued. 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: 2022
    ZDB Id: 1467823-8
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    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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  • 4
    Online-Ressource
    Online-Ressource
    Elsevier BV ; 2005
    In:  Journal of Molecular Structure: THEOCHEM Vol. 727, No. 1-3 ( 2005-8), p. 139-148
    In: Journal of Molecular Structure: THEOCHEM, Elsevier BV, Vol. 727, No. 1-3 ( 2005-8), p. 139-148
    Materialart: Online-Ressource
    ISSN: 0166-1280
    Sprache: Englisch
    Verlag: Elsevier BV
    Publikationsdatum: 2005
    ZDB Id: 1491514-5
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Online-Ressource
    Online-Ressource
    American Chemical Society (ACS) ; 2003
    In:  The Journal of Physical Chemistry A Vol. 107, No. 38 ( 2003-09-01), p. 7337-7339
    In: The Journal of Physical Chemistry A, American Chemical Society (ACS), Vol. 107, No. 38 ( 2003-09-01), p. 7337-7339
    Materialart: Online-Ressource
    ISSN: 1089-5639 , 1520-5215
    RVK:
    Sprache: Englisch
    Verlag: American Chemical Society (ACS)
    Publikationsdatum: 2003
    ZDB Id: 2006031-2
    ZDB Id: 1357795-5
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Online-Ressource
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    AIP Publishing ; 2004
    In:  The Journal of Chemical Physics Vol. 120, No. 23 ( 2004-06-15), p. 10914-10924
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 120, No. 23 ( 2004-06-15), p. 10914-10924
    Kurzfassung: In the present work, we have computed the energy and hardness profiles for a series of inter and intramolecular conformational changes at several levels of calculation. All processes studied have in common the fact that the choice of a weak methodology or a poor basis set results in the presence of spurious stationary points in the energy profile. At variance with the energy profiles, the hardness profiles calculated as the difference between the vertical ionization potential and electron affinity always show the correct number of stationary points independently of the basis set and methodology used. For this reason, we have concluded that hardness profiles can be used to check the reliability of the energy profiles for those chemical systems that, because of their size, cannot be treated with high level ab initio methods.
    Materialart: Online-Ressource
    ISSN: 0021-9606 , 1089-7690
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2004
    ZDB Id: 3113-6
    ZDB Id: 1473050-9
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Online-Ressource
    Online-Ressource
    AIP Publishing ; 2004
    In:  The Journal of Chemical Physics Vol. 120, No. 14 ( 2004-04-08), p. 6346-6355
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 120, No. 14 ( 2004-04-08), p. 6346-6355
    Kurzfassung: Using three typical π-conjugated molecules (1,3,5-hexatriene, 1-formyl-6-hydroxyhexa-1,3,5- triene, and 1,1-diamino-6,6-dinitrohexa-1,3,5-triene) we investigate the level of ab initio theory necessary to produce reliable values for linear and nonlinear optical properties, with emphasis on the vibrational contributions that are known to be important or potentially important. These calculations are made feasible by employing field-induced coordinates in combination with a finite field procedure. For many, but not all, purposes the MP2/6-31+G(d) level is adequate. Based on our results the convergence of the usual perturbation treatment for vibrational anharmonicity was examined. Although this treatment is initially convergent in most circumstances, a problematic situation has been identified.
    Materialart: Online-Ressource
    ISSN: 0021-9606 , 1089-7690
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2004
    ZDB Id: 3113-6
    ZDB Id: 1473050-9
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    Online-Ressource
    Online-Ressource
    AIP Publishing ; 2002
    In:  The Journal of Chemical Physics Vol. 117, No. 23 ( 2002-12-15), p. 10561-10570
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 117, No. 23 ( 2002-12-15), p. 10561-10570
    Kurzfassung: In a recent paper [J. Am. Chem. Soc. 123, 7951 (2001)] we have shown for the first time the existence of molecules with nontotally symmetric vibrational modes that break the maximum hardness (MHP) and minimum polarizability (MPP) principles. We present here an extension of this previous work by devising a mathematical procedure that helps to determine the nontotally symmetric molecular distortions of a given molecule that do not follow the MPP or the MHP. This methodology is based on the diagonalization of the Hessian matrix of the polarizability or the hardness with respect to the vibrational normal coordinates. For a relatively large series of molecules, we have carried out diagonalizations of the Hessian matrix of the polarizability to determine the molecular distortions with a more marked MPP or anti-MPP character. From the results obtained, we have derived a set of simple rules that allow to predict a priori without calculations the existence of vibrational modes that break the MPP. With respect to the MHP, the results strongly depend on the method of calculation, but the same rules are useful to predict the existence of vibrational modes that disobey the MHP when the Koopmans’ approximation is used to calculate the hardness.
    Materialart: Online-Ressource
    ISSN: 0021-9606 , 1089-7690
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2002
    ZDB Id: 3113-6
    ZDB Id: 1473050-9
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    Online-Ressource
    Online-Ressource
    American Chemical Society (ACS) ; 2001
    In:  Journal of the American Chemical Society Vol. 123, No. 32 ( 2001-08-01), p. 7951-7952
    In: Journal of the American Chemical Society, American Chemical Society (ACS), Vol. 123, No. 32 ( 2001-08-01), p. 7951-7952
    Materialart: Online-Ressource
    ISSN: 0002-7863 , 1520-5126
    RVK:
    Sprache: Englisch
    Verlag: American Chemical Society (ACS)
    Publikationsdatum: 2001
    ZDB Id: 1472210-0
    ZDB Id: 3155-0
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    Online-Ressource
    Online-Ressource
    AIP Publishing ; 2002
    In:  The Journal of Chemical Physics Vol. 116, No. 13 ( 2002-04-01), p. 5363-5373
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 116, No. 13 ( 2002-04-01), p. 5363-5373
    Kurzfassung: Ab initio Hartree–Fock and MP2 calculations of the longitudinal (hyper)polarizability—including the static electronic, static zero-point vibrational average (ZPVA), and pure vibrational (static and dynamic) contributions—have been carried out on a set of seven typical medium size conjugated nonlinear optical (NLO) molecules. The ZPVA is obtained through first-order in mechanical plus electrical anharmonicity. Based on physical “nuclear relaxation” considerations the individual (square bracket) terms that contribute to the pure vibrational (hyper)polarizability are then taken into account through third-, fourth-, or fifth-order depending upon the type of term. In order to carry out the correlated treatment, field-induced coordinates and a special finite field technique are utilized. Correlation leads to very substantial differences in the absolute and relative values of the various contributions. In comparison to the electronic term the ZPVA correction is usually small but in one case is over two-thirds as large. On the other hand, both static and dynamic pure vibrational contributions are commonly of a magnitude that is comparable to, or are larger than, the electronic term. The higher-order pure vibration terms are often large. For dynamic processes they can be almost as important as the lowest-order terms; for static (hyper)polarizabilities they can be more important. Thus, for typical NLO molecules, the initial convergence behavior of the perturbation series in mechanical and electrical anharmonicity requires further investigation.
    Materialart: Online-Ressource
    ISSN: 0021-9606 , 1089-7690
    Sprache: Englisch
    Verlag: AIP Publishing
    Publikationsdatum: 2002
    ZDB Id: 3113-6
    ZDB Id: 1473050-9
    Standort Signatur Einschränkungen Verfügbarkeit
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