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  • 1
    In: Stroke and Vascular Neurology, BMJ, Vol. 6, No. 4 ( 2021-12), p. 542-552
    Abstract: During the COVID-19 pandemic, decreased volumes of stroke admissions and mechanical thrombectomy were reported. The study’s objective was to examine whether subarachnoid haemorrhage (SAH) hospitalisations and ruptured aneurysm coiling interventions demonstrated similar declines. Methods We conducted a cross-sectional, retrospective, observational study across 6 continents, 37 countries and 140 comprehensive stroke centres. Patients with the diagnosis of SAH, aneurysmal SAH, ruptured aneurysm coiling interventions and COVID-19 were identified by prospective aneurysm databases or by International Classification of Diseases, 10th Revision, codes. The 3-month cumulative volume, monthly volumes for SAH hospitalisations and ruptured aneurysm coiling procedures were compared for the period before (1 year and immediately before) and during the pandemic, defined as 1 March–31 May 2020. The prior 1-year control period (1 March–31 May 2019) was obtained to account for seasonal variation. Findings There was a significant decline in SAH hospitalisations, with 2044 admissions in the 3 months immediately before and 1585 admissions during the pandemic, representing a relative decline of 22.5% (95% CI −24.3% to −20.7%, p 〈 0.0001). Embolisation of ruptured aneurysms declined with 1170–1035 procedures, respectively, representing an 11.5% (95%CI −13.5% to −9.8%, p=0.002) relative drop. Subgroup analysis was noted for aneurysmal SAH hospitalisation decline from 834 to 626 hospitalisations, a 24.9% relative decline (95% CI −28.0% to −22.1%, p 〈 0.0001). A relative increase in ruptured aneurysm coiling was noted in low coiling volume hospitals of 41.1% (95% CI 32.3% to 50.6%, p=0.008) despite a decrease in SAH admissions in this tertile. Interpretation There was a relative decrease in the volume of SAH hospitalisations, aneurysmal SAH hospitalisations and ruptured aneurysm embolisations during the COVID-19 pandemic. These findings in SAH are consistent with a decrease in other emergencies, such as stroke and myocardial infarction.
    Type of Medium: Online Resource
    ISSN: 2059-8688 , 2059-8696
    Language: English
    Publisher: BMJ
    Publication Date: 2021
    detail.hit.zdb_id: 2847692-X
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  • 2
    In: International Journal of Stroke, SAGE Publications, Vol. 16, No. 8 ( 2021-10), p. 927-934
    Abstract: Assessment of the impact of the thrombectomy learning curve on clinical outcomes is essential for developing healthcare system protocols. Aims The aim of this study was to assess the effect of thrombectomy case volume on procedural and clinical outcomes in a Brazilian registry. Methods A total of 645 patients with acute ischemic stroke treated by thrombectomy were included in the analysis. Patients were divided into two groups regarding the period of treatment: the early period group and the late period group. Results In the adjusted analysis, treatment in the late period was an independent predictor of recanalization (odds ratio 1.91, 95% CI 1.28–2.86) and excellent neurologic outcomes at three months (odds ratio 1.77, 95% CI 1.04–3.01). Treatment in the late period had no significant association with mortality (odds ratio 0.88, 95% CI 0.55–1.41). Conclusions An increase in thrombectomy case volume for the treatment of AIS over time was an independent predictor of recanalization and excellent neurologic outcome.
    Type of Medium: Online Resource
    ISSN: 1747-4930 , 1747-4949
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2211666-7
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  • 3
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 47, No. suppl_1 ( 2016-02)
    Abstract: Introduction: Patent Foramen Ovale (PFO) is the most common right-to-left shunt (RLS) and is often found in young patients with stroke related to paradoxical embolism. Contrast-Enhanced Transesophageal Echocardiography (TEE) is considered a gold standard to visualize PFO. Transcranial Doppler (TCD) with bubble test is often used to detect RLS with good correlation to TEE for the diagnostic of PFO. More recently, Transcranial Color Coded Sonography (TCCS) which included B-mode and color coded imaging has overcome TCD in many clinical applications but the accuracy of TCCS for detection of RLS and PFO has not been systematically evaluated. Hypothesis: To determine if the TCCS is an accurate tool to identify both PFO and RLS. Methods: We investigate 106 patients with ischemic stroke under 55 years-old admitted from 2012 to 2014 in a tertiary academic hospital. Patients were evaluated with TEE, TCD and TCCS, and all exams included a saline bubble test. The examiners were blinded for the other tests results. Kappa agreement was calculated inter-examiners for TCCS and TCD. Accuracy of TCCS was calculated in comparison to TEE. Results: We detected a RLS in 54 (50.9%) patients (age mean 43.9 ± 8.2) with kappa agreement 0.92 (95%CI 0.78-1.0) when performed TCCS and TCD. TEE and TCSS were positive in 23/98 (23.4%) and TEE did not reveal contrast in 20/98 (20.4%). In 30 (28.3%) patients only TEE revealed a PFO. TCSS had a sensitivity of 88.4% (95%CI 0.68-0.97), specificity of 72.2% (95%CI 0.60-0.81) and positive likelihood ratio of 3.18 (2.14-4.73) of the diagnosis of PFO. Conclusion: TCCS and TCD had an excellent agreement. TCCS has a good accuracy for the detection of PFO and RLS in young patients with stroke.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2016
    detail.hit.zdb_id: 1467823-8
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  • 4
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 45, No. suppl_1 ( 2014-02)
    Abstract: Background: AND AIM: Chagas disease (CD) is a common cause of stroke in undeveloped countries and has become more frequent in the US, where it is largely underestimated. CD related strokes are believed to be mainly cardioembolic but some studies have suggested concomitant cerebral vasculitis. Data on the safety of recanalization therapies in patients with acute stroke related to CD is still restricted to single case reports. We aimed to assess the rate of symptomatic intracranial hemorrhage (SIH) in a group of patients with CD-related stroke treated with intravenous tissue plasminogen activator (IV TPA) and/or endovascular therapy. METHODS: We performed a retrospective analysis of a prospective, single-center, hospital-based registry of acute stroke patients treated with IV TPA and/or endovascular therapy and routinely tested for CD. Demographics, medical history and clinical data were obtained from the registry. CT scans at admission and after 24-48 hours were blindly reviewed by two experienced stroke neurologists, who rated the presence of hemorrhage transformation according to the European Cooperative Acute Stroke Study criteria. RESULTS: From 2001 to 2012, 197 patients met the inclusion criteria for this study. CD was diagnosed in 30 patients (15.2%). Patients with CD had higher admission scores on the National Institute of Health Stroke Scale [median: 19; interquartile range (IR): 16-22; no CD: 14; IR: 9-19; P 〈 0.01]. Among patients treated with IV TPA, the rate of SIH was similar among patients with CD (1/24; 4.2%) and patients without CD (8/150; 5.3%; OR: 0.77, 95% CI: 0.09-6.46; P=0.99). Among those treated with rescue endovascular treatment, SIH occurred in 2/6 (33.3%) patients with CD and in 3/17 (17.6%) patients without CD (OR: 2.33, 95%CI: 0.28-19.17, P=0.58). Overall, there was no difference in mortality between groups [CD: 6 (20%); no CD: 24 (14.4%); OR: 1.49; 95% CI: 0.55-4.0; P=0.42] . CONCLUSIONS: In the largest series of patients with acute stroke related to CD treated with recanalization therapies ever reported, we found that IV TPA appears to be safe in these patients. Further studies are necessary to confirm the safety and efficacy of endovascular recanalization strategies in patients with CD.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2014
    detail.hit.zdb_id: 1467823-8
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  • 5
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 45, No. suppl_1 ( 2014-02)
    Abstract: Background: Obstructive sleep apnea (OSA) is frequent in acute stroke patients and is associated with increased mortality and poor functional outcome. Polysomnography (PSG) is the gold standard diagnostic method for OSA, but it is impracticable as a routine for all acute stroke patients. We evaluated how OSA screening tools such as the Berlin Questionnaire (BQ) and the Epworth Sleepiness Scale (ESS) would perform when administered to relatives of stroke patients in the acute setting, and compared these individual tools against a combined screening score (SOS score). Methods: Ischemic stroke patients were submitted to a full PSG at the first night after symptoms onset. OSA severity was measured by apnea-hypopnea index (AHI). BQ and ESS were administered to relatives of stroke patients before the PSG. We combined elements of the BQ and ESS to create a new screening tool for OSA named Sleep Obstructive apnea score optimized for Stroke (SOS score). Results: Thirty-nine consecutives ischemic stroke patients were enrolled in our study. The mean age was 62.3 ±12.2 years. Age was significantly different between those with and without OSA (p=0.02). The mean body mass index and neck circumference were 26.7 ± 4.7 and 38.9 ± 4.0cm, respectively. OSA (AHI ≥ 10) was present in 76.9%. The area under the curve for SOS score (AUC:0.812; p=0.005) was superior to BQ (AUC:0.567; p=0.549) and also to ESS (AUC:0.646; p=0.119 vs. AUC:0.686; p=0.048) for severe OSA (IAH ≥ 30). The threshold of SOS ≤ 10 (present in 20.5% of patients) showed high sensitivity (90%) and negative predictive value (96.2%) for OSA; SOS ≥20 (17.9% of patients) showed high specificity (100%) and positive predictive value (92.5%) for severe OSA. Using SOS as a screening approach would decrease by around 40% the demand for PSG during the acute stroke setting. Conclusions: The SOS score when administered to relatives of stroke patients appears to be an appropriate tool to screen acute stroke patients for OSA, while decreasing the need for a formal sleep study during the acute stroke setting. The new derived SOS score is superior to BQ and ESS for identifying patients with OSA and Severe OSA during the acute phase of stroke.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2014
    detail.hit.zdb_id: 1467823-8
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  • 6
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 47, No. suppl_1 ( 2016-02)
    Abstract: Introduction: After the results of the new endovascular trials that demonstrated a robust effect of endovascular treatment for acute ischemic stroke (AIS), early detection of proximal artery occlusion (PAO) has become a fundamental task during the initial assessment of acute stroke patients at the emergency department. Nevertheless, an accurate identification of PAO may be particularly challenging in smaller hospitals and in developing countries, areas with restricted assess to vascular neuroimaging modalities such as CTA and MRA. Hypothesis: Algorithms based on NIHSS and non-contrasted CT (NCCT) findings can be accurately used to detect PAO in patients with AIS of the anterior circulation. Method: We retrospectively evaluated 194 consecutive patients with AIS of the anterior circulation from a prospective stroke registry of patients admitted to an academic tertiary emergency unit in Brazil during 2014 that had a NCCT and a CTA at admission. NIHSS scores and attenuation of major intracranial arteries of the anterior circulation on NCCT were collected by two experienced investigators that were blind to the CT angiography findings. We used a ratio between two ROIs (rVA) that were drawn on NCCT blinded to CT angiography: (i) on the region of highest vessel attenuation ipsilateral to the involved hemisphere and (ii) mirror ROI on the corresponding vessel segment of the contralateral hemisphere. We used ROC curve analysis and C-statistics to predict CT angiography PAO. Results: NIHSS and vessel attenuation values were highly associated with the PAO with an area under the curve (AUC) of 0.88 (p 〈 0,001) and 0.83 (p 〈 0,001), respectively. An NIHSS of 10 at admission had a sensitivity, and negative predictive value of 97% and 97%, respectively. The rVA ≥ 1.50 had a specificity and positive predictive value 96% and 85%, respectively. The POA score was then built by logistic regression from NIHSS and rVA and showed even higher accuracy for the presence of POA on CTA, with an AUC of 0.93 (p 〈 0,001). Conclusion: The PAO score based on admission NIHSS and proximal vessel attenuation on NCCT can be accurately used to detect PAO in patients with AIS of the anterior circulation. Further studies are necessary to validate this score in a multicenter setting.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2016
    detail.hit.zdb_id: 1467823-8
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  • 7
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 47, No. suppl_1 ( 2016-02)
    Abstract: Introduction: Transcranial Color-Coded Sonography (TCCS) including B-mode imaging and color-coded Duplex is non-invasive, bedside and inexpensive tool for the assessment of the intracranial circulation. TCCS can be used to assess intracranial stenosis but its accuracy has not been systematically compared to CT angiography in acute stroke patients. Hypothesis: TCCS has high accuracy when compared to CT angiography for the detection and measurement of intracranial arterial stenosis in patients with acute ischemic stroke. Methods: In this prospective study 43 patients (67% male; mean age: 59.8 ± 11 years) with acute ischemic stroke or Transient Ischemic Accident (TIA) underwent examinations of the intracranial arteries by TCCS and CT angiography. Different examiners that were blinded to test results performed the exams. TCCS and CT angiography were performed during the hospital stay. All stenotic segments of intracranial vessels were classified into 4 groups: normal or mild ( 〈 50%), moderate (50%-70%), severe (≥70%) and subocclusion/occlusion. Results: 580 of 645 arterial segments in 43 patients were evaluated. The sensitivity, specificity, positive predictive value, and negative predictive value of TCCD in comparison with CT angiography for the detection of moderate to severe intracranial stenosis (≥50%) were 81.5%, 100%, 100%, and 76% respectively. The Cohen’s kappa between TCCS and CT angiography was 0.76 (p 〈 0.001). Conclusions: TCCS is a bedside non-invasive tool that can be used to evaluate intracranial arteries with high accuracy for moderate to severe stenosis when compared to CT angiography. Moderate agreement was found between TCCS and CT angiography for the evaluation of intracranial stenosis in patients with acute ischemic stroke or TIA.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2016
    detail.hit.zdb_id: 1467823-8
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  • 8
    In: International Journal of Stroke, SAGE Publications, Vol. 16, No. 1 ( 2021-01), p. 100-109
    Abstract: RESILIENT is a prospective, multicenter, randomized phase III trial to test the safety, efficacy, and cost-effectiveness of mechanical thrombectomy as compared to medical treatment alone in patients treated under the less than ideal conditions typically found in the public healthcare system of a developing country. Methods Subjects must fulfill the following main inclusion criteria: symptom onset ≤8 h, age ≥18 years, baseline NIHSS ≥8, evidence of intracranial ICA or proximal MCA (M1 segment) occlusion, ASPECTS ≥6 on CT or 〉 5 on DWI-MRI and be either ineligible for or unresponsive to intravenous alteplase. The primary end-point is the distribution of disability levels (on the modified Rankin Scale, mRS) at 90 days under the intention-to-treat principle. Randomization Randomization is performed under a minimization process using age, baseline NIHSS, intravenous alteplase use, occlusion site and center. Design The trial is designed with an expectation of a 10% difference in the proportion of favorable outcome (mRS 0–2 at 90 days) common odds ratio of 1.615. Primary outcome Projected sample size is 690 subjects with pre-planned interim analyses at 174, 346, and 518 subjects. Secondary outcomes Secondary end-points include: 90-day functional independence (mRS ≤2), mRS shift stratified for treatment with IV rt-PA at 90 days, infarct volume on 24 h CT or MRI, early dramatic response (NIHSS 0–2 or improvement ≥8 points) at 24 h, vessel recanalization evaluated by CTA or MRA at 24 h, and the post-procedure rate of successful reperfusion (defined as a modified Treatment in Cerebral Infarction 2b or greater). Safety variables are mortality at 90 days, symptomatic intracranial hemorrhage at 24 h and procedure-related complications.
    Type of Medium: Online Resource
    ISSN: 1747-4930 , 1747-4949
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2211666-7
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  • 9
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 44, No. suppl_1 ( 2013-02)
    Abstract: Background: Cerebrovascular reactivity (CVR) has been suggested as an independent predictor of stroke in patients with severe carotid stenosis. Functional-MRI (fMRI) can be used to assess CVR by comparing latency parameters of the neurovascular coupling, i.e. BOLD response at baseline and during hypercarbic challenge. We aim to compare BOLD amplitude and latency parameters in the ipsilateral (IH) and contralateral hemispheres (CH) induced by auditory stimulus, under different hypercapnia levels in diabetic and non-diabetic patients with symptomatic carotid stenosis, before and after carotid stenting. Methods: seven diabetic and eight non-diabetic patients with unilateral severe symptomatic carotid stenosis and similar clinical characteristics were evaluated. The protocol was undertaken one week before and three months after the endovascular intervention. Subjects were submitted to auditory stimulus (3s) under normocapnia and EtCO2 increase of 5 and 10mmHg. The images were acquired with a 3T MRI-scanner, preprocessed and BOLD response amplitude and latency parameters were analyzed. Results: We observed decreased BOLD amplitude in the IH compared to the CH (p 〈 0.05) in non-diabetic patients in hypercapnic conditions, and was compromised bilaterally in diabetic patients before the stenting. In diabetic patients the mean change on BOLD latency parameters were not significant with CO2 increment. After carotid stenting, BOLD amplitude (p 〈 0.05) under hypercapnic conditions and area under the curve (P 〈 0.05) were increased for non-diabetic patients but not for diabetic patients. Conclusions: diabetic patients have diffuse baseline compromise of CVR and their cerebrovascular reactivity measured on BOLD fMRI does not respond to carotid stenting as non-diabetic patients.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2013
    detail.hit.zdb_id: 1467823-8
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  • 10
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 51, No. Suppl_1 ( 2020-02)
    Abstract: Background: Randomized trials performed in high income countries have shown similar effects of mechanical thrombectomy (MT) in elderly and non-elderly patients with large vessel ischemic strokes (LVO). We aimed to assess the effect of age on the clinical outcome of MT in RESILIENT (a randomized, prospective, multicenter, controlled, phase III, clinical trial with blinded outcome assessment performed in Brazil designed to assess the safety, efficacy, and cost-effectiveness of mechanical thrombectomy as compared to medical treatment alone). Methods: Patients were classified as elderly and non-elderly (≤ 70 vs. 〉 70 years). The end-points were the common odds ratio (cOR) of mRs (shift analysis) and the frequency of functional independence (mRS 0-2) at 90 days. Ordinal logistic regression analysis (unadjusted and adjusted for important potential confounders) with age group as an interaction term were performed. A p value 〈 0.05 was considered statistically significant. Results: Among 221 randomized patients (117- 52.9% males), 89 (40.2%) were classified as elderly. Age had an important effect modification of MT on the mRS shift analysis (elderly - cOR 1.20 95% CI [0.57-2.51] vs. non-elderly cOR 3.9, 95% CI [1.65-5.80] , p-interaction = 0.003) and on the frequency of functional independence at 90 days (elderly - OR 0.92 95% CI [0.33 - 2.59] vs. non-elderly OR 3.56, 95% CI [1.64 - 7.75] , p-interaction = 0.04). A similar effect modification was observed after adjusting for IV rt-PA, occlusion site, baseline NIHSS and ASPECTS on the mRS shift analysis (elderly - cOR 1.34, 95% CI [0.63 - 2.86] vs. non-elderly cOR 3.26, 95% CI [1.73 - 6.13] , p-interaction = 0.06) and on the frequency of functional independence at 90 days (elderly - OR 1.08 95% CI [0.36 - 3.21] vs. non-elderly OR 4.26, 95% CI [1.85 - 9.82] , p-interaction = 0.04) . Conclusion: The large effect size of MT on LVO outcomes is significantly diminished in the elderly population of patients treated under the less than ideal conditions typically found in the public healthcare system of a developing country.
    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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