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  • Garcia-Tornel, Alvaro  (9)
  • Molina, Carlos A  (9)
  • 2020-2024  (9)
  • Medicine  (9)
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  • 2020-2024  (9)
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  • Medicine  (9)
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  • 1
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 54, No. Suppl_1 ( 2023-02)
    Abstract: Introduction: Recent publications suggest a positive added effect of iv-thrombolysis (IVT) in patients that undergo endovascular treatment (EVT). It is hypothesized that thrombolytics might have a beneficial impact on microcirculation beyond recanalization. We aim to analyze the potential impact of IVT in patients who underwent a repeated CTP after interhospital transfer. Methods: We retrospectively screened 116 patients transferred to our comprehensive stroke center from a primary stroke center capable to perform CTP from June 2021 to August 2022. We collected clinical and radiological data of patients that underwent CTP at both centers, which were analyzed with Rapid software. A neurointerventionalist assessed the occlusion location in CTA. Results: Twenty-eight patients with anterior circulation occlusion underwent two multimodal studies, median time between CTPs was 168[142-190]min. Fifteen (53.6%) patients received IVT in the primary stroke center and 13(46.4%) received EVT. Reperfusion occurred in 3(10.7%) cases, migration to distal segments in 5(17.9%). Among the 20 patients without changes in the occlusion location, CTP volumes remained stable (Tmax 〉 6s 61[41-141]ml vs 62[24-178] , p=0.72; Tmax 〉 10s 19[8-96] vs 13[0-105] , p=0.55; CBF30 0[0-66] vs 0[0-65] , p=0.99). CTP volumes tended to decrease with IVT, but a modest increase was observed in patients that did not receive IVT (Tmax 〉 6s -17[-29,+8]ml vs +22[-8,+42] , p=0.08; Tmax 〉 10s -8[-16,+6] vs +6[0,+37] , p=0.10; CBF 〈 30% 0[-6,0] vs 0[0,+4] , p=0.14) (figure). In a linear regression to predict CTP volumes in the second center, interaction between baseline values and IVT was significant for Tmax 〉 10s (p=0.06) and CBF 〈 30% (p 〈 0.05). Conclusion: In acute stroke patients with a LVO, no substantial changes are expected in CTP volumes in the absence of recanalization. However, patients that receive IVT tend to present reduced hypoperfusion volumes as compared with patients that do not receive IVT.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2023
    detail.hit.zdb_id: 1467823-8
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  • 2
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 53, No. Suppl_1 ( 2022-02)
    Abstract: Aim: We performed a histological and immune analysis of the clot in acute stroke patients to detect surrogates of stroke etiology. Methods: We conducted a prospective observational study of consecutive patients with acute stroke who underwent thrombectomy that obtained extracted thrombus (ITACAT study). Several staining were performed to evaluate red blood cells/fibrin (hematoxylin/eosin), platelets (CD61) and leucocytes (CD4, CD8 and CD20). All patients received CT angio to detect extra/intracranial vascular stenosis and 30-day cardiac monitoring to diagnose AF. According to TOAST classification the thrombi were classified in cardioembolic etiology CE (T-CE), due to symptomatic atherosclerosis (T-AT) and without any cause (T-CRYP). We excluded strokes due to double cause or incomplete workup. Results: Of the 117 patients: 30 were T-AT, 55 were T-CE and 32 were T-CRYP. T-AT patients were younger: T-AT 68 years (60-77) Vs. T-CE 75 years (68-80) Vs. T-CRYP 72 years (55-81) (p=0.034). T-AT group had higher percentage of CD4: T-AT 6.52% (4-13) Vs. T-CE (3.31% (12.9) Vs .T-CRYP 3.72% (1.5-12) (p=0.015) and lower percentage of CD61: T-AT 51.18% (34-68) Vs. CE 64.70% (19.56) Vs. CRYP 70.3% (19) (p=0.001). There were no correlation between CD4 and platelets. Both CD4 OR 1.05 (1-1.10) (p=0.020) and CD61 (OR 0.96 (0.94-0.98) (p=0.01) independently predicted T-AT from the age. Final analysis (n=400 cases) will be ended in September 2021. Conclusions: Patients with high percentage of CD4 and low percentage of CD61 are related to atherosclerosis etiology.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2022
    detail.hit.zdb_id: 1467823-8
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  • 3
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 54, No. Suppl_1 ( 2023-02)
    Abstract: Background: Several noncontrast computed tomography (NCCT), single-phase computed tomography angiography (CTA), and multiphase CTA markers of intracerebral hemorrhage (ICH) expansion have been previously proposed. We derived and validated three scores for the prediction of hematoma expansion depending on the use of NCCT, single-phase CTA, or multiphase CTA markers of hematoma expansion. Methods: We prospective studied 276 consecutive patients with ICH within 6 hours from symptom onset. After deriving NCCT, single-phase CTA, and multiphase CTA scores in a 5-year period population (n=156), we validated them in a different 3-year period population (n=120). Outcome parameters included substantial hematoma expansion 〉 6 mL or 〉 33% at 24 hours (primary outcome) and poor outcome (mRS score 〉 2) at 90 days. Results: The most accurate marker of hematoma expansion was spot sign in phase 1 of multiphase CTA (80.3%). The four independent predictors of substantial hematoma expansion included in the different scores were ultraearly hematoma growth (uHG) 〉 5 mL/h, heterogeneous density, spot sign in phase 1 of multiphase CTA, and spot sign in any phase of multiphase CTA (Table). On each of the three scores, the proportion of patients that experienced substantial hematoma expansion increased with each point increase. C-index for both substantial hematoma expansion and poor outcome in the derivation and validation cohort was lower in NCCT expansion score than in single-phase CTA expansion score which, in turn, was lower than in multiphase CTA expansion score (Table). Conclusions: This study demonstrates the added prognostic value of more advanced CT modalities in acute ICH evaluation. Single-phase CTA score and, especially, multiphase CTA score, are more robust than NCCT score in the prediction of hematoma expansion and poor outcome. These scores may help to refine the selection of patients at risk of expansion and poorest outcomes in different decision-making scenarios.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2023
    detail.hit.zdb_id: 1467823-8
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  • 4
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 51, No. Suppl_1 ( 2020-02)
    Abstract: On CT perfusion (CTP), cerebral blood flow 〈 30% than the contralateral hemisphere (CBF 〈 30) is considered a marker of infarct core. Our hypothesis is that CBF 〈 30 defines a reversible poor hemodynamic area rather than core and aimed to study CBF 〈 30 evolution over time, its relationship with leptomeningeal collateral circulation (CC) and outcome parameters. Methods: Retrospective analysis of a prospective database of acute ischemic strokes who underwent CTP on admission and immediately after endovascular thrombectomy (EVT). CC was graded on CT angiography (CTA) by the modified Tan scale (good CC: 2-3 grades). Complete recanalization was defined by modified Thrombolysis in Cerebral Ischemia ≥ 2B. Final infarct volume (FIV) was semi-automatically measured on 48-72h CT; ghost core was defined as: admission CBF 〈 30 - FIV 〉 10cc. Results: We included 494 patients; median time from onset to CT: 137 min (IQR 68-238). Median CBF 〈 30 volume on admission: 8 cc (0-28). With longer onset-to-CT times ischemic changes progressively increased on non-contrast CT (ASPECTS decay r=-0.21, p 〈 0.01), however CBF 〈 30 progressively decreased (r=-0.13, p 〈 0.01). 294 patients (60.6%) presented good CC. Good CC was associated with lower admission CBF 〈 30 (median CBF 〈 30 on good CC: 0 cc (0-12) vs 28.5 (7-57) on poor CC, p 〈 0.01). In recanalized patients (419, 84.8%), CBF 〈 30 virtually disappeared in CTP post-EVT (n=103) (median CBF 〈 30: 0ml (IQR 0) (88%= 0 cc) despite that most patients developed established infarcts (median FIV 16 (4-50), 59% FIV 〉 10cc)). Even in recanalized patients, baseline CBF 〈 30 only moderately correlates with FIV (r=0.55, p 〈 0.01). A ghost core was identified in 13.7% (34.5% if CT was performed 〈 90min from onset). 46.6% patients had good functional outcome (mRS 〈 3 at 3 months). A multivariate analysis of recanalized patients showed that CC (OR 0.43, CI 0.27-0.69, p 〈 0.01) but not CBF 〈 30 was an independent predictor of functional outcome. Conclusion: CBF 〈 30 represents an hemodynamic state rather than established infarct core, evolving over time inversely as it should physiologically (increase of infarct core over time). CBF 〈 30 should be considered as an outcome predictor but not used as exclusion criterion for EVT, especially in early time-windows.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2020
    detail.hit.zdb_id: 1467823-8
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  • 5
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 53, No. Suppl_1 ( 2022-02)
    Abstract: 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.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2022
    detail.hit.zdb_id: 1467823-8
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  • 6
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 55, No. Suppl_1 ( 2024-02)
    Abstract: Introduction: Femoral artery is the most used access for mechanical thrombectomy (MT) in stroke patients with a large vessel occlusion. Routine radial access has been proposed as an alternative following cardiology guidelines although its safety and efficacy remain controversial. Hypothesis: Radial access for MT is non-inferior to femoral access in terms of final recanalization. Methods: The study was an investigator-initiated, single-center, evaluator-blinded randomized clinical trial. Stroke patients undergoing MT, with femoral artery patency and radial artery diameter ≥2.5mm were randomly assigned (1:1) to either radial (60 patients) or femoral access (60 patients). The primary binary outcome was successful recanalization (final eTICI score 2b-3) assigned by blinded evaluators. In the per protocol analysis, patients with allocated access failure were considered non-recanalized. We established a non-inferiority margin of -13.2%, considering an acceptable reduction of 15% in the expected recanalization rates. Results: From September 2021 to July 2023, 120 patients were randomly assigned and 114 (57 radial access, 57 femoral access) with confirmed intracranial occlusion on initial angiogram were included in the primary analysis. In the intention to treat analysis, successful recanalization was achieved in 48/57 (84.2%) patients assigned to femoral access and in 54/57(94.7%) patients assigned to radial (adjusted risk difference 3.36%, 95% CI –6.47% to 13%; p 〈 0.001). The lower limit of one-sided 95% CI was –4.8%, which did not cross our predefined margin of -13.2%. Median time from angiography suite arrival to first pass (femoral: 30 (IQR 25-37) minutes versus radial: 41 (IQR 33-62) minutes, p 〈 0.001) and from suite arrival to recanalization (femoral: 42 (IQR 28-74) versus radial: 59.5 (IQR 44-81) minutes, p 〈 0.050) were longer after radial access. Both groups presented one severe access complication and there was no difference in the rate of allocated access failure: radial 6 (10.5%) radial Vs femoral 5 (8.8%) (p=0.751). Conclusion: Among patients who underwent MT, radial access was non-inferior to femoral access in terms of final recanalization. Procedural delays may favor femoral access as default first approach.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2024
    detail.hit.zdb_id: 1467823-8
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  • 7
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 51, No. Suppl_1 ( 2020-02)
    Abstract: A significant proportion of patients with acute ischemic stroke (AIS) treated with endovascular thrombectomy (EVT) present poor functional outcome despite recanalization. We aim to investigate computed tomography perfusion (CTP) patterns after EVT and their association with outcome Methods: Prospective study of anterior large vessel occlusion AIS patients who achieved complete recanalization (defined as modified Thrombolysis in Cerebral Ischemia (TICI) 2b - 3) after EVT. CTP was performed within 30 minutes post-EVT recanalization (POST-CTP): hypoperfusion was defined as volume of time to maximal arrival of contrast (Tmax) delay ≥6 seconds in the affected territory. Hyperperfusion was defined as visual increase in cerebral blood flow (CBF) and volume (CBV) with advanced Tmax compared with the unaffected hemisphere. Dramatic clinical recovery (DCR) was defined as a decrease of ≥8 points in NIHSS score at 24h or NIHSS≤2 and good functional outcome by mRS ≤2 at 3 months. Results: One-hundred and forty-one patients were included. 49 (34.7%) patients did not have any perfusion abnormality on POST-CTP, 60 (42.5%) showed hypoperfusion (median volume Tmax≥6s 17.5cc, IQR 6-45cc) and 32 (22.8%) hyperperfusion. DCR appeared in 56% of patients and good functional outcome in 55.3%. Post-EVT hypoperfusion was related with worse final TICI, and associated worse early clinical evolution, larger final infarct volume (p 〈 0.01 for all) and was an independent predictor of functional outcome (OR 0.98, CI 0.97-0.99, p=0.01). Furthermore, POST-CTP identified patients with delayed improvement: in patients without DCR (n=62, 44%), there was a significant difference in post-EVT hypoperfusion volume according to functional outcome (hypoperfusion volume of 2cc in good outcome vs 11cc in poor outcome, OR 0.97 CI 0.93-0.99, p=0.04), adjusted by confounding factors. Hyperperfusion was not associated with worse outcome (p=0.45) nor symptomatic hemorrhagic transformation (p=0.55). Conclusion: Hypoperfusion volume after EVT is an accurate predictor of functional outcome. In patients without dramatic clinical recovery, hypoperfusion predicts good functional outcome and defines a “stunned-brain” pattern. POST-CTP may help to select EVT patients for additional therapies.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2020
    detail.hit.zdb_id: 1467823-8
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  • 8
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 51, No. Suppl_1 ( 2020-02)
    Abstract: Introduction: First pass recanalization (FPR) is known to be a strong predictor of good outcome in endovascular treatment (EVT) of stroke. The reasons why FPR leads to better outcome than if achieved in multiple-passes (MP) are unknown. We aim to investigate the recanalization pattern and its relation with good outcome. Methods: 609 consecutive patients underwent EVT in the anterior circulation at a single stroke center. Demographic and imaging characteristics, number of passes and recanalization pattern were recorded. Complete recanalization was defined as mTICI2b-3 at the end of EVT. Good functional outcome was defined as modified Rankin scale (mRs) 0-2 at 90 days. Sudden recanalization(SR) was considered when mTICI score varied from 0-1 to 2B-3 in a single pass. Progressive recanalization (PR) was considered if mTICI 2a was achieved at an interim pass before achieving complete recanalization. Patients were categorized as recanalizers at first-pass (FP) and multiple-passes (MP) or non-recanalizers (NR). 70 (10.3%) patients in MP group were excluded due to missing procedural data. Results: 509 (83.9%) patients achieved complete recanalization. SR was achieved in 378 (62.1%) patients; 280 (46%) were FP-SR and 98 (16.1%) were MP-SR. MP-PR was achieved in 131 (21.5%) patients. Rates of good functional outcome depending on recanalization pattern were: FP-SR 57.5%, MP-SR 57.1% (FP-SR vs MP-SR, OR 0.9 CI 0.53-1.54, p=0.7), MP-PR 29.8% (MP-SR vs MP-PR, OR 3.06 CI 1.66-5.62, p 〈 0.001) and NR 17% (MP-PR vs NR, OR 1.23 CI 0.49-3.09, p=0.66). In patients with complete recanalization, univariate analysis showed that both FP (OR 1.91, CI 1.34-2.72, p 〈 0.01) and SR (OR 3.18, CI 2.08-4.87, p 〈 0.01) were associated with good functional outcome. Multivariate analysis showed that SR was a predictor of good functional outcome (OR 3.12, CI 1.9-5.1, p 〈 0.01), being FPR non-significant (OR 1.12, CI 0.66-1.9, p=0.666). Conclusions: Sudden recanalization is a strong predictor of good functional outcome in patients undergoing EVT, even after previous unsuccessful attempts. Progressive recanalization may reflect clot fragmentation and embolization due to more friable composition, leading to worse outcomes. Benefits of first pass effect are driven by sudden recanalization.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2020
    detail.hit.zdb_id: 1467823-8
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  • 9
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 51, No. Suppl_1 ( 2020-02)
    Abstract: Introduction: Perfusion imaging has emerged as an imaging tool to select patients with acute ischemic stroke (AIS) secondary to large vessel occlusion (LVO) for endovascular treatment (EVT). We aim to compare an automated method to assess the infarct ischemic core (IC) in Non-Contrast Computed Tomography (NCCT) with Computed Tomography Perfusion (CTP) imaging and its ability to predict functional outcome and final infarct volume (FIV). Methods: 494 patients with anterior circulation stroke treated with EVT were included. Volumetric assessment of IC in NCCT (eA-IC) was calculated using eASPECTS™ (Brainomix, Oxford). CTP was processed using availaible software considering CTP-IC as volume of Cerebral Blood Flow (CBF) 〈 30% comparing with the contralateral hemisphere. FIV was calculated in patients with complete recanalization using a semiautomated method with a NCCT performed 48-72 hours after EVT. Complete recanalization was considered as modified Thrombolysis In Cerebral Ischemia (mTICI) ≥2B after EVT. Good functional outcome was defined as modified Rankin score (mRs) ≤2 at 90 days. Statistical analysis was performed to assess the correlation between EA-IC and CTP-IC and its ability to predict prognosis and FIV. Results: Median eA-IC and CTP-IC were 16 (IQR 7-31) and 8 (IQR 0-28), respectively. 419 patients (85%) achieved complete recanalization, and their median FIV was 17.5cc (IQR 5-52). Good functional outcome was achieved in 230 patients (47%). EA-IC and CTP-IC had moderate correlation between them (r=0.52, p 〈 0.01) and similar correlation with FIV (r=0.52 and 0.51, respectively, p 〈 0.01). Using ROC curves, both methods had similar performance in its ability to predict good functional outcome (EA-IC AUC 0.68 p 〈 0.01, CTP-IC AUC 0.66 p 〈 0.01). Multivariate analysis adjusted by confounding factors showed that eA-IC and CTP-IC predicted good functional outcome (for every 10cc and 〉 40cc, OR 1.5, IC1.3-1.8, p 〈 0.01 and OR 1.3, IC1.1-1.5, p 〈 0.01, respectively). Conclusion: Automated volumetric assessment of infarct core in NCCT has similar performance predicting prognosis and final infarct volume than CTP. Prospective studies should evaluate a NCCT-core / vessel occlusion penumbra missmatch as an alternative method to select patients for EVT.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2020
    detail.hit.zdb_id: 1467823-8
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