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1.
Sensors (Basel) ; 21(2)2021 Jan 12.
Artigo em Inglês | MEDLINE | ID: mdl-33445603

RESUMO

Acute ischemic stroke is characterized by dynamic changes in metabolism and hemodynamics, which can affect brain temperature. We used proton magnetic resonance (MR) spectroscopy under everyday clinical settings to measure brain temperature in seven patients with internal carotid artery occlusion to explore the relationship between lesion temperature and clinical course. Regions of interest were selected in the infarct area and the corresponding contralateral region. Single-voxel MR spectroscopy was performed using the following parameters: 2000-ms repetition time, 144-ms echo time, and 128 excitations. Brain temperature was calculated from the chemical shift between water and N-acetyl aspartate, choline-containing compounds, or creatine phosphate. Within 48 h of onset, compared with the contralateral region temperature, brain temperature in the ischemic lesion was lower in five patients and higher in two patients. Severe brain swelling occurred subsequently in three of the five patients with lower lesion temperatures, but in neither of the two patients with higher lesion temperatures. The use of proton MR spectroscopy to measure brain temperature in patients with internal carotid artery occlusion may predict brain swelling and subsequent motor deficits, allowing for more effective early surgical intervention. Moreover, our methodology allows for MR spectroscopy to be used in everyday clinical settings.


Assuntos
Temperatura Corporal , Isquemia Encefálica/fisiopatologia , Espectroscopia de Prótons por Ressonância Magnética/métodos , Idoso , Idoso de 80 Anos ou mais , Edema Encefálico/diagnóstico por imagem , Isquemia Encefálica/diagnóstico por imagem , Doenças das Artérias Carótidas/fisiopatologia , Artéria Carótida Interna/fisiopatologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade
2.
Sci Data ; 8(1): 4, 2021 01 07.
Artigo em Inglês | MEDLINE | ID: mdl-33414507

RESUMO

Ischemic brain injuries are frequent and difficult to detect reliably or early. We present the multi-modal data set containing cardiovascular (blood pressure, blood flow, electrocardiogram) and brain electrical activities to derive electroencephalogram (EEG) biomarkers of corticothalamic communication under normal, sedation, and hypoxic/ischemic conditions with ensuing recovery. We provide technical validation using EEGLAB. We also delineate the corresponding changes in the electrocardiogram (ECG)-derived heart rate variability (HRV) with the potential for future in-depth analyses of joint EEG-ECG dynamics. We review an open-source methodology to derive signatures of coupling between the ECoG and electrothalamogram (EThG) signals contained in the presented data set to better characterize the dynamics of thalamocortical communication during these clinically relevant states. The data set is presented in full band sampled at 2000 Hz, so the additional potential exists for insights from the full-band EEG and high-frequency oscillations under the bespoke experimental conditions. Future studies on the dataset may contribute to the development of new brain monitoring technologies, which will facilitate the prevention of neurological injuries.


Assuntos
Isquemia Encefálica/fisiopatologia , Encéfalo/fisiopatologia , Animais , Pressão Sanguínea , Eletrocardiografia , Eletroencefalografia , Frequência Cardíaca , Fluxo Sanguíneo Regional , Suínos
3.
PLoS One ; 15(12): e0242466, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33370282

RESUMO

BACKGROUND: In real-world practice settings, there is insufficient evidence on the efficacy of antiplatelet drugs, including clopidogrel, aspirin, and ticlopidine, in stroke prevention. PURPOSE: To compare the efficacies between aspirin and clopidogrel and aspirin and ticlopidine in stroke prevention. METHODS: This population-based case-cohort study utilized the data obtained from a randomized sample of one million subjects in the Taiwan National Health Insurance Research Database. Patients who were hospitalized owing to the primary diagnosis of ischemic stroke from January 1, 2000 to December 31, 2010 and treated with aspirin, ticlopidine, or clopidogrel were included in the study. Propensity score matching with a 1:4 ratio was performed to compare aspirin with ticlopidine and clopidogrel. The criteria for inclusion were the use of one of the three antiplatelet drugs for more than 14 days within the first month after the stroke and then continued use of the antiplatelet drugs until the study endpoint of recurrent stroke. RESULTS: During the 3-year follow-up period, the recurrent stroke rates were 1.62% (42/2585), 1.48% (3/203), and 2.55% (8/314) in the aspirin, ticlopidine, and clopidogrel groups, respectively. Compared with the patients treated with aspirin, those treated with clopidogrel and ticlopidine showed competing risk-adjusted hazard ratios of recurrent stroke of 2.27 (1.02-5.07) and 0.62 (0.08-4.86), respectively. CONCLUSION: Compared with the patients treated with aspirin, those treated with clopidogrel were at a higher risk of recurrent stroke. For stroke prevention, aspirin was superior to clopidogrel whereas ticlopidine was not inferior to aspirin.


Assuntos
Aspirina/uso terapêutico , Isquemia Encefálica/prevenção & controle , Clopidogrel/uso terapêutico , Inibidores da Agregação de Plaquetas/uso terapêutico , Acidente Vascular Cerebral/prevenção & controle , Ticlopidina/uso terapêutico , Adulto , Idoso , Isquemia Encefálica/sangue , Isquemia Encefálica/fisiopatologia , Estudos de Coortes , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Pontuação de Propensão , Recidiva , Prevenção Secundária/métodos , Acidente Vascular Cerebral/sangue , Acidente Vascular Cerebral/fisiopatologia , Taiwan
5.
Cerebrovasc Dis ; 49(5): 550-555, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33091908

RESUMO

BACKGROUND: The evolution of the symptomatic intracranial occlusion during transfers from primary stroke centers (PSCs) to comprehensive stroke centers (CSCs) for endovascular treatment (EVT) is not widely known. Our aim was to identify factors related to partial or complete recanalization (REC) at CSC arrival in patients with a documented large vessel occlusion (LVO) in PSC transferred for EVT evaluation to better define the workflow at CSC of this group of patients. METHODS: We conducted an observational, multicenter study from a prospective, government-mandated, population-based registry of stroke patients with documented LVO at PSC transferred to CSC for EVT from January 2017 to June 2019. The primary end point was defined as partial or complete REC that precluded EVT at CSC arrival (REC). We evaluated the association between baseline, treatment variables and time intervals with the presence of REC. RESULTS: From 589 patients, the rate of REC at CSC was 10.5% in all LVO patients transferred from PSC to CSC for EVT evaluation. On univariate analysis, lower PSC-NIHSS (median 12vs.16, p = 0.001), tPA treatment at PSC (13.7 vs. 5.0%; p = 0.001), presence of M2 occlusion on PSC (16.8 vs. 9%; p = 0.023), and clinical improvement at CSC arrival (21.7 vs. 9.6% p = 0.001) were associated with REC at CSC. On multivariate analysis, clinical improvement at CSC arrival (p < 0.001, OR: 5.96 95% CI: 2.5-13.9) and PSC tPA treatment predicted REC (p = 0.003, OR: 4.65, 95% CI: 1.73-12.4). CONCLUSION: REC at CSC arrival occurs exceptionally in patients with a documented LVO on PSC. Repeating a second vascular study before EVT would not be necessary in most patients. Despite its modest effect, tPA treatment at PSC was an independent predictor of REC.


Assuntos
Isquemia Encefálica/terapia , Procedimentos Endovasculares , Fibrinolíticos/administração & dosagem , Transferência de Pacientes , Reperfusão , Acidente Vascular Cerebral/terapia , Terapia Trombolítica , Ativador de Plasminogênio Tecidual/administração & dosagem , Idoso , Idoso de 80 Anos ou mais , Isquemia Encefálica/diagnóstico , Isquemia Encefálica/fisiopatologia , Procedimentos Endovasculares/efeitos adversos , Feminino , Fibrinolíticos/efeitos adversos , Humanos , Masculino , Pessoa de Meia-Idade , Sistema de Registros , Reperfusão/efeitos adversos , Estudos Retrospectivos , Espanha , Acidente Vascular Cerebral/diagnóstico , Acidente Vascular Cerebral/fisiopatologia , Terapia Trombolítica/efeitos adversos , Ativador de Plasminogênio Tecidual/efeitos adversos , Resultado do Tratamento , Fluxo de Trabalho
6.
J Stroke Cerebrovasc Dis ; 29(11): 105139, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33066880
7.
J Stroke Cerebrovasc Dis ; 29(11): 105211, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33066897

RESUMO

INTRODUCTION: Acute management of blood pressure in ischemic stroke treated with reperfusion therapy remains uncertain. We evaluated blood pressures during the first 24-hours after reperfusion therapy in relation to in-hospital outcomes. METHODS: We conducted a single-center retrospective study of blood pressure in the first 24 hours among ischemic stroke patients who underwent reperfusion therapy with intravenous thrombolysis (IVT) or mechanical thrombectomy (MT) at a tertiary referral center. Blood pressure variability was expressed as the range between the highest and the lowest pressures. Outcomes of interest were discharge disposition and in-hospital mortality. Favorable outcome was defined as a discharge destination to home or inpatient rehabilitation facility (IRF). Multivariable logistic regression analysis was performed with adjustment for age, National Institutes of Health Stroke Scale score, and patients receiving reperfusion therapy. RESULTS: Among the 140 ischemic stroke patients (117 IVT, 84 MT and 61 both), 95 (67.8%) had favorable discharge disposition and 24 (17.1%) died. Higher 24-hour peak systolic blood pressures (SBPs) and peak mean arterial pressures (MAPs) were independently associated with a lower likelihood of favorable discharge disposition, with an adjusted odds ratio (aOR) 0.868, 95 % CI 0.760 - 0.990 per 10 mm Hg for SBP and aOR 0.710, 95% CI 0.515 - 0.980 for MAP, and with increased odds of death aOR 1.244, 95% CI 1.056-1.467 and aOR 1.760, 95% CI 1.119 - 2.769 respectively. Greater variability of SBP and MAP was also associated with odds of death aOR 1.327, 95% CI 1.104 - 1.595 and aOR 1.577, 95% CI 1.060- 2.345 respectively, without a significant effect on discharge disposition. CONCLUSION: In the first 24 hours after reperfusion therapy, higher peak and variable blood pressures are associated with unfavorable discharge outcomes and increased in-hospital mortality. Further studies in stroke patients undergoing reperfusion therapy might target blood pressure reduction and variability to improve patient outcomes.


Assuntos
Pressão Arterial , Isquemia Encefálica/terapia , Alta do Paciente , Acidente Vascular Cerebral/terapia , Trombectomia , Terapia Trombolítica , Idoso , Idoso de 80 Anos ou mais , Isquemia Encefálica/diagnóstico , Isquemia Encefálica/mortalidade , Isquemia Encefálica/fisiopatologia , Feminino , Mortalidade Hospitalar , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Fatores de Risco , Acidente Vascular Cerebral/diagnóstico , Acidente Vascular Cerebral/mortalidade , Acidente Vascular Cerebral/fisiopatologia , Trombectomia/efeitos adversos , Trombectomia/mortalidade , Terapia Trombolítica/efeitos adversos , Terapia Trombolítica/mortalidade , Fatores de Tempo , Resultado do Tratamento
8.
J Stroke Cerebrovasc Dis ; 29(11): 105206, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33066902

RESUMO

BACKGROUND: Arterial stiffness is an independent determinant of cardiovascular and cerebrovascular risks. The relationship between the increase in arterial stiffness parameters and the severity of stroke has been shown in previous studies. We aimed to investigate the association between clinical improvement and changes in arterial stiffness parameters in patients presenting acute ischemic stroke. METHODS: A total of 107 patients were enrolled in this study. On the first and seventh day of the hospitalization, 24 h non-invasive blood pressure was monitored and arterial stiffness parameters were measured. The National Institutes of Health Stroke Scale (NIHSS) was used to determine the severity of stroke, and the Modified Rankin Scale was used to determine dependency and to evaluate functional improvements. RESULTS: Arterial stiffness parameters of augmentation index (AIx@75) and pulse wave velocity (PWV) were significantly higher in patients who died during hospitalization than patients who were discharged (respectively p <0.001, p = 0.04). In the group with clinical improvement, PWV values measured on the seventh day were significantly lower than PWV values measured on the first day (p = 0.032). When the changes in PWV value measured on the first and seventh day for both groups were analyzed using mixed ANOVA test, p value were significant (p = 0.033). Multivariate binary logistic regression analyses showed that negatively change in PWV and CDBP independently predicts the clinical improvement. CONCLUSIONS: Increased AIx@75 and PWV appear to be associated with higher in-hospital mortality rates in patients with acute ischemic stroke. Additionally, clinical improvement in patients with ischemic stroke is associated with a decrease in PWV .


Assuntos
Isquemia Encefálica/diagnóstico , Análise de Onda de Pulso , Acidente Vascular Cerebral/diagnóstico , Rigidez Vascular , Idoso , Idoso de 80 Anos ou mais , Isquemia Encefálica/mortalidade , Isquemia Encefálica/fisiopatologia , Isquemia Encefálica/terapia , Feminino , Mortalidade Hospitalar , Humanos , Pacientes Internados , Masculino , Pessoa de Meia-Idade , Alta do Paciente , Valor Preditivo dos Testes , Estudos Prospectivos , Recuperação de Função Fisiológica , Fatores de Risco , Acidente Vascular Cerebral/mortalidade , Acidente Vascular Cerebral/fisiopatologia , Acidente Vascular Cerebral/terapia , Fatores de Tempo , Resultado do Tratamento
9.
J Stroke Cerebrovasc Dis ; 29(11): 105199, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33066918

RESUMO

OBJECTIVE: To evaluate the association between the number of stent retriever (SR) passes and clinical outcome after mechanical thrombectomy (MT) in patients with acute ischemic stroke(AIS). METHODS: We retrospectively analyze data collected from consecutive patients with large vessel occlusion (LVO) in anterior circulation treated with MT. Baseline characteristics, number of SR passes, symptomatic intracranial hemorrhage (sICH), clinical outcome measured by modified Rankin Scale (mRS) at 90 days after MT were collected. Multivariate logistic regression analysis was performed to assess the association between number of SR passes and patients' clinical outcome. RESULTS: 134 patients with LVO achieved successful reperfusion (mTICI 2B/3) were enrolled. Univariate analysis showed that patients with favorable outcomes were less likely to need more than three passes of SR (9.8%vs39.7%, p = 0.001). In a multivariable analysis, baseline NIHSS score (OR 0.922, 95%CI 0.859∼0.990, p = 0.025), more than three passes of SR (OR 0.284, 95%CI0.091∼0.882, p = 0.030) and symptomatic intracranial hemorrhage (OR 0.116,95%CI0.021∼0.650, p = 0.014) each independently predicted poor outcome after MT at 90 days. CONCLUSION: The need for more than three passes of SR may be used as an independent predictor of poor outcome after MT in patients with acute ischemic stroke at 90 days.


Assuntos
Isquemia Encefálica/terapia , Stents , Acidente Vascular Cerebral/terapia , Trombectomia/instrumentação , Idoso , Idoso de 80 Anos ou mais , Isquemia Encefálica/diagnóstico por imagem , Isquemia Encefálica/fisiopatologia , Avaliação da Deficiência , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Recuperação de Função Fisiológica , Estudos Retrospectivos , Medição de Risco , Fatores de Risco , Acidente Vascular Cerebral/diagnóstico por imagem , Acidente Vascular Cerebral/fisiopatologia , Trombectomia/efeitos adversos , Fatores de Tempo , Resultado do Tratamento
10.
J Stroke Cerebrovasc Dis ; 29(11): 105203, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33066933

RESUMO

OBJECTIVES: We investigate the relationship between the severity of vascular disease and epicardial adipose tissue thickness(EAT-t) and the neutrophil/lymphocyte (NEU/LY) ratio in acute stroke patients. METHODS: Seventy-six patients and 38 healthy controls were included in the study. Strokes were divided into three groups: lacunar infarction, middle cerebral artery infarction (MCA), and other arterial infarcts. Patients were assessed using the GCS (Glasgow coma scale) and NIHSS (National Institutes of Health Stroke Scale) scales. In addition to laboratory measurements, EAT-t was evaluated in all patients by using echocardiography. RESULTS: The EAT-t value and NEU/LY ratio were higher in the patient group than in the control group. The MCA group was found to have a significantly higher NEU/LY ratio than the lacuna group (p = 0.017) as well as the other patient (p = 0.025) group. There was a positive correlation of NIHSS score with EAT-t (r = 0.291; p = 0.013), and NEU/LY ratio (r = 0.289; p = 0.014). CONCLUSION: The EAT-t and NEU/LY ratio were high in patients with acute ischemic stroke patients. The higher ratio of NEU/LY compared to other infarcts in the MCA group. These findings support the relationship between acute ischemic stroke severity and inflammation .


Assuntos
Tecido Adiposo/diagnóstico por imagem , Isquemia Encefálica/sangue , Isquemia Encefálica/diagnóstico por imagem , Ecocardiografia , Linfócitos , Neutrófilos , Pericárdio/diagnóstico por imagem , Acidente Vascular Cerebral/sangue , Acidente Vascular Cerebral/diagnóstico por imagem , Tecido Adiposo/fisiopatologia , Adiposidade , Idoso , Isquemia Encefálica/fisiopatologia , Estudos de Casos e Controles , Estudos Transversais , Feminino , Humanos , Contagem de Linfócitos , Masculino , Pessoa de Meia-Idade , Pericárdio/fisiopatologia , Valor Preditivo dos Testes , Fatores de Risco , Índice de Gravidade de Doença , Acidente Vascular Cerebral/fisiopatologia
11.
J Stroke Cerebrovasc Dis ; 29(11): 105166, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33066940

RESUMO

INTRODUCTION: The number of patients with left ventricular assist devices (LVAD) is rapidly growing in industrialized countries. While cerebrovascular events comprise a significant complication, data on stroke etiology, clinical management and functional outcome are scarce. METHODS: Consecutive LVAD patients with ischemic or hemorrhagic stroke receiving treatment at an university stroke center between 2010 and 2018 were included into an institutional registry. Clinical characteristics, causes, management and functional outcome of stroke occurring within this cohort are reported. Acceptable functional outcome was defined as mRS 0-3. RESULTS: N = 30 acute strokes occurred in 20 patients (77% ischemic, 23% hemorrhagic, mean age 57 ± 13 years, 10% female, 8 patients (40%) had more than one event). 87% of all events happened with non-pulsatile devices, on average 9 (IQR 3-22) months after the implantation. All patients used oral anticoagulation with a Vitamin-K antagonist in combination with anti-platelets. The international normalized ratio (INR)-values were outside the therapeutic range in 39% of ischemic strokes and in 57% of hemorrhagic strokes. Ischemic strokes were predominantly of cardioembolic origin (92%) and of mild to moderate clinical severity (median NIHSS 6 (IQR 4-10). None qualified to receive intravenous thrombolysis or intra-arterial endovascular therapy. 61% of IS-patients showed an acceptable functional outcome after three months. 4/7 patients with hemorrhagic stroke received immediate reversal of anticoagulation without any thrombotic complications. CONCLUSION: The majority of LVAD patients with ischemic stroke had an acceptable functional outcome after three months. Future clinical research is warranted to improve therapeutic strategies for acute care and stroke prevention.


Assuntos
Anticoagulantes/administração & dosagem , Isquemia Encefálica/tratamento farmacológico , Cardiopatias/terapia , Coração Auxiliar , Hemorragias Intracranianas/tratamento farmacológico , Inibidores da Agregação de Plaquetas/administração & dosagem , Acidente Vascular Cerebral/tratamento farmacológico , Função Ventricular Esquerda , Administração Oral , Adulto , Idoso , Anticoagulantes/efeitos adversos , Isquemia Encefálica/diagnóstico , Isquemia Encefálica/fisiopatologia , Avaliação da Deficiência , Feminino , Cardiopatias/diagnóstico , Cardiopatias/fisiopatologia , Humanos , Hemorragias Intracranianas/diagnóstico , Hemorragias Intracranianas/fisiopatologia , Masculino , Pessoa de Meia-Idade , Inibidores da Agregação de Plaquetas/efeitos adversos , Recuperação de Função Fisiológica , Sistema de Registros , Acidente Vascular Cerebral/diagnóstico , Acidente Vascular Cerebral/fisiopatologia , Fatores de Tempo , Resultado do Tratamento
12.
J Stroke Cerebrovasc Dis ; 29(11): 105137, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33066942

RESUMO

PURPOSE: Intravenous Thrombolysis (IV rt-PA) is administered in <10% of ischemic stroke patients. In rare cases, patients or caregivers refuse IV rt-PA treatment even when recommended by stroke practitioners. We sought to assess the characteristics and outcomes of patients who refuse IV rt-PA for acute ischemic stroke, and to compare outcomes between those who were treated with IV rt-PA and those who refused. METHODS: We examined data from the prospectively collected, IRB approved UC San Diego Stroke Registry who presented as a "stroke code" from July 2004 to July 2019 at two academic facilities and five community hospitals. Patients were included if they presented within 4.5 hours of symptom onset or last seen normal, had a "stroke code" alert activated, and were either treated with IV rt-PA or the reason for exclusion was patient/family refusal. Patients were considered "refusers" if IV rt-PA was recommended by the provider during the stroke code and the patient and/or legally authorized representative declined treatment. Baseline demographics, baseline National Institutes of Health Stroke Scale (NIHSS), treatment times and 90-day Modified Rankin Scale (mRS) were collected. Patients who refused IV rt-PA were compared to those that were treated with IV rt-PA. Data was examined for frequencies and distribution. Chi squared was used to evaluate nominal variables. Continuous variables were assessed by Pearson correlation and t test. Kruskal-Wallis or ANOVA were used to evaluate group differences. RESULTS: A total of 1056 patients were included in the analysis. Forty-seven patients (4.5%) refused IV rt-PA. There were no significant socio-demographic differences between patients who were treated with IV rt-PA and those who refused. Compared to patients who were treated with IV rt-PA, patients who refused IV rt-PA had a significantly lower baseline NIHSS (4 vs 9, p < 0.0001) and higher baseline mRS (IQR 0-1.0 vs 0-2.8, p < 0.001). The time from arrival to treatment decision was significantly longer in patients who refused IV rt-PA (group mean 57.9 min vs 48.8 min, p = 0.03). Data for 90-day outcome was available for 556 (55.1%) patients treated with IV rt-PA and 20 (42.5%) patients who refused IV rt-PA. There was no difference in 90-day mRS between groups (p = 0.68). CONCLUSIONS: There is a low rate of IV rt-PA refusal in our registry population which is similar to what previous studies have shown. We found that patients who refuse IV rt-PA have significantly milder deficits and significantly worse pre-morbid disability. We speculate that the longer "arrival to decision" time in the refuse IV rt-PA group is due to longer informed consent discussions. This analysis furthers the body of literature regarding rt-PA refusals.


Assuntos
Isquemia Encefálica/tratamento farmacológico , Fibrinolíticos/administração & dosagem , Acidente Vascular Cerebral/tratamento farmacológico , Terapia Trombolítica , Recusa do Paciente ao Tratamento , Administração Intravenosa , Idoso , Idoso de 80 Anos ou mais , Isquemia Encefálica/diagnóstico , Isquemia Encefálica/fisiopatologia , California , Avaliação da Deficiência , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Recuperação de Função Fisiológica , Sistema de Registros , Estudos Retrospectivos , Acidente Vascular Cerebral/diagnóstico , Acidente Vascular Cerebral/fisiopatologia , Fatores de Tempo , Tempo para o Tratamento , Resultado do Tratamento
14.
J Comput Assist Tomogr ; 44(5): 708-713, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32936578

RESUMO

OBJECTIVE: Assessing collateral status is important in acute ischemic stroke (AIS). The purpose of this study was to establish an easy and rapid method for evaluating collateral flow. METHODS: A total of 60 patients with AIS were enrolled. The patients were aged 18 to 85 years with endovascular therapy treatment within 10 hours after the appearance of stroke symptoms, prestroke modified Rankin Scale ≤1, Alberta Stroke Program Early CT Score ≥6, and the occlusion of large vessels in anterior circulation. We reformed imaging strategies by conducting a small-dose group-injection test before normal computed tomography angiography (CTA) scanning and selected the visual collateral score and the regional leptomeningeal score scales as the single-phase CTA collateral flow assessment scales with the replacement of the parasagittal anterior cerebral artery territory by anterior cerebral artery regions adjacent to the longitudinal fissure and then verified, respectively, the consistencies between the 2 single-phase CTA-based collateral scales and the digital subtraction angiography (DSA)-based American Society of Interventional and Therapeutic Neuroradiology/Society of Interventional Radiology scale and compared the prognosis of endovascular therapy between the AIS patients in the poor-collateral-flow group and the other patients' group assessed by 2 single-phase CTA-based collateral scales. RESULTS: There was a high consistency between the 2 single-phase CTA-based collateral flow scales with DSA-based American Society of Interventional and Therapeutic Neuroradiology/Society of Interventional Radiology scale. The assessment by using CTA-based collateral flow assessment methods generated consistent results. CONCLUSION: The single-phase CTA-based visual collateral score scale and regional leptomeningeal score scale can be used as the imaging evidence for the evaluation of collateral flow in AIS patients in the majority of grassroots hospitals where DSA is difficult to carry out.


Assuntos
Isquemia Encefálica/diagnóstico por imagem , Angiografia Cerebral/métodos , Circulação Colateral/fisiologia , Angiografia por Tomografia Computadorizada/métodos , Acidente Vascular Cerebral/diagnóstico por imagem , Idoso , Angiografia Digital/métodos , Encéfalo/irrigação sanguínea , Encéfalo/diagnóstico por imagem , Encéfalo/fisiopatologia , Isquemia Encefálica/complicações , Isquemia Encefálica/fisiopatologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Reprodutibilidade dos Testes , Acidente Vascular Cerebral/complicações , Acidente Vascular Cerebral/fisiopatologia
15.
Stroke ; 51(10): 3064-3073, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32883193

RESUMO

BACKGROUND AND PURPOSE: Understanding the mechanisms underlying progression/regression of symptomatic intracranial atherosclerotic stenosis (sICAS) will inform secondary prevention of the patients. Focal wall shear stress (WSS) may play an important role, which, however, had seldom been investigated. METHODS: Patients with acute ischemic stroke or transient ischemic attack (TIA) attributed to 50% to 99% intracranial atherosclerotic stenosis were recruited. All patients underwent cerebral computed tomography angiography at baseline, and a computational fluid dynamics model was built based on computed tomography angiography to simulate blood flow and quantify WSS in the vicinity of the sICAS lesion. All patients received optimal medical treatment and a second computed tomography angiography at 1 year. The change in the luminal stenosis from baseline to 1 year in sICAS was defined as progression (increased >10%), quiescence (±10%), or regression (decreased >10%). Associations between baseline WSS metrics and sICAS regression were analyzed. RESULTS: Among 39 patients (median age 62 years; 27 males), sICAS luminal stenosis progressed, remained quiescent and regressed in 6 (15.4%), 15 (38.5%), and 18 (46.2%) cases, respectively. A higher maximum WSS and larger high-WSS area, throughout the sICAS lesion or obtained separately in the proximal and distal parts of the lesion, were independently associated with regression of luminal stenosis in sICAS over 1 year. CONCLUSIONS: A majority of sICAS lesions regress or stay quiescent in the luminal stenosis over 1 year after stroke under optimal medical treatment, when higher focal WSS may facilitate stenosis regression. Further studies of the effects of hemodynamics including WSS in altering plaque vulnerability and stroke risks are needed.


Assuntos
Isquemia Encefálica/fisiopatologia , Arteriosclerose Intracraniana/fisiopatologia , Estresse Mecânico , Acidente Vascular Cerebral/fisiopatologia , Idoso , Isquemia Encefálica/diagnóstico por imagem , Angiografia por Tomografia Computadorizada , Progressão da Doença , Feminino , Humanos , Hidrodinâmica , Arteriosclerose Intracraniana/diagnóstico por imagem , Masculino , Pessoa de Meia-Idade , Modelos Neurológicos , Fatores de Risco , Acidente Vascular Cerebral/diagnóstico por imagem
16.
BMC Neurol ; 20(1): 333, 2020 Sep 03.
Artigo em Inglês | MEDLINE | ID: mdl-32883246

RESUMO

BACKGROUND: It is unknown whether microangiopathic ischemic strokes outside the visual pathway go along with subclinical changes of the retinal structure or the visual system. The objectives of this prospective non-interventional case series were to investigate if spectral-domain optical coherence tomography (SD-OCT) or multifocal visual evoked potentials (mfVEPs) can detect structural retinal changes or functional impairment of the visual system in patients with microangiopathic ischemic stroke. METHODS: We used SD-OCT to cross-sectionally analyze the retinal morphology of 15 patients with microangiopathic ischemic stroke according to the Trial of Org 10172 in Acute Stroke Treatment (TOAST) classification not affecting the visual pathway. We employed semi-automated segmentation of macular volume scans to analyze the thickness of the macular retinal layers and peripapillary ring scans to investigate the retinal morphology in comparison to a control group without stroke. Visual function was assessed by the mfVEP technique in 13 microangiopathic ischemic stroke patients. RESULTS: First peak latency of mfVEPs was significantly delayed in the microangiopathic ischemic stroke group compared to the control patients. Neither the retinal layers nor the mfVEPs' amplitude differed between the microangiopathic ischemic stroke patients and the control group. CONCLUSIONS: In conclusion, microangiopathic ischemic stroke patients presented a delayed first peak latency in mfVEPs as a sign of subclinical functional impairment of the visual pathway. However, our case series suggests no influence on retinal structure resulting from microangiopathic ischemic stroke outside the visual system. Larger and longitudinal studies are needed to confirm these mfVEP findings.


Assuntos
Isquemia Encefálica/fisiopatologia , Retina/diagnóstico por imagem , Acidente Vascular Cerebral/fisiopatologia , Idoso , Potenciais Evocados Visuais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Tomografia de Coerência Óptica/métodos , Testes de Campo Visual , Vias Visuais/fisiopatologia
17.
J Stroke Cerebrovasc Dis ; 29(10): 105150, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32912504

RESUMO

Hemichorea and other hyperkinetic movement disorders are a rare presentation of stroke, usually secondary to deep infarctions affecting the basal ganglia and the thalamus. Chorea can also result from lesions limited to the cortex, as shown in recent reports. Still, the pathophysiology of this form of cortical stroke-related chorea remains unknown. We report 4 cases of acute ischemic cortical strokes presenting as hemichorea, with the infarction being limited to the parietal and insular cortex in perfusion computed tomography scans and magnetic resonance imaging. These cases suggest potential dysfunction of pathways connecting these cortical regions with the basal ganglia.


Assuntos
Isquemia Encefálica/complicações , Córtex Cerebral/irrigação sanguínea , Coreia/etiologia , Lobo Parietal/irrigação sanguínea , Acidente Vascular Cerebral/complicações , Idoso , Isquemia Encefálica/diagnóstico por imagem , Isquemia Encefálica/fisiopatologia , Isquemia Encefálica/terapia , Coreia/diagnóstico , Coreia/fisiopatologia , Feminino , Humanos , Masculino , Recuperação de Função Fisiológica , Acidente Vascular Cerebral/diagnóstico por imagem , Acidente Vascular Cerebral/fisiopatologia , Acidente Vascular Cerebral/terapia , Resultado do Tratamento
18.
J Stroke Cerebrovasc Dis ; 29(10): 105091, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32912516

RESUMO

BACKGROUND: Mechanical thrombectomy is now standard of care for treatment of acute ischemic stroke secondary to large vessel occlusion in the setting of high NIHSS. We analysed a large nationwide registry focusing on patients with large vessel occlusion and low NIHSS on admission to evaluate the efficacy and safety of thrombectomy in this patient population METHODS: 2826 patients treated with mechanical thrombectomy were included in a multicentre registry from January 1, 2011 to December 31, 2015. We included patients with large vessel occlusion and NIHSS ≤ 6 on admission. Baseline characteristics, imaging, clinical outcome, procedure adverse events and positive and negative outcome predictors were analysed. RESULTS: 134 patients were included. 90/134 had an anterior circulation and 44 a posterior circulation stroke. One patient died before treatment. Successful revascularization (mTICI 2b-3) was achieved in 73.7% (98/133) of the patients. Intraprocedural adverse event was observed in 3% (4/133) of cases. Symptomatic intracranial haemorrhage rate was 5.3% (7/133). At three months, 70.9% (95/134) of the patients had mRS score 0-2, 15.7% (21/134) mRS 3-5 and 13.4% (18/134) mRS 6. Age and successful recanalization were significant predictors of a good clinical outcome on both univariate (p= 0.005 and p=0.007) and multivariable (p=0.0018 and p=0.009 [nat log]) analysis. Absence of vessel recanalization and symptomatic intracranial hemorrhage were independent predictors of poor outcome (p=0.021) . CONCLUSIONS: Our study suggests that patients with large vessel occlusion and low NIHSS score on admission can benefit from mechanical thrombectomy. Randomized trials are warranted.


Assuntos
Isquemia Encefálica/terapia , Avaliação da Deficiência , Acidente Vascular Cerebral/terapia , Trombectomia , Idoso , Isquemia Encefálica/diagnóstico , Isquemia Encefálica/fisiopatologia , Feminino , Humanos , Itália , Masculino , Pessoa de Meia-Idade , Valor Preditivo dos Testes , Estudos Prospectivos , Recuperação de Função Fisiológica , Sistema de Registros , Fatores de Risco , Acidente Vascular Cerebral/diagnóstico , Acidente Vascular Cerebral/fisiopatologia , Trombectomia/efeitos adversos , Fatores de Tempo , Resultado do Tratamento
19.
J Stroke Cerebrovasc Dis ; 29(10): 105168, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32912520

RESUMO

BACKGROUND AND PURPOSE: Isolated Sulcal Effacement (ISE) is focal cortical swelling without obscuration of cortical gray-white junction. The available information on its role in acute stroke patients treated with intravenous (IV) tissue plasminogen activator (tPA) is limited. METHODS: ISE along with ASPECT and rLMC collateral score were determined in pre-treatment CT/CT angiography of 195 consecutive acute stroke patients treated with IV tPA "only". In addition, ISE-ASPECT score was created. Role of ISE on responsiveness to IV tPA, thrombolysis-associated hemorrhage and functional outcome were studied in 102 patients with CT-angiography-confirmed anterior system proximal vessel occlusion. RESULTS: ISE was observed in 12 patients (6.2% of all and 11.4% of those with occlusion of the carotid terminus, M1, or proximal M2) corresponding to excellent specificity (100%) but fair sensitivity (12%) for diagnosis of anterior cerebral circulation proximal artery occlusion. ISE ASPECT score was significantly correlated with rLMC score (p=0.023). Presence of ISE was linked to younger age, female gender, lower NIHSS, along with higher ASPECT and rLMC scores. Albeit not persisted after adjustment for collateral status and NIHSS, dramatic response to IV tPA along with excellent (23% vs. 8%, p<0.05), good (21% vs. 6%, p<0.05) and acceptable (19% vs. 4%, p<0.05) functional outcome were significantly higher in patients with ISE. CONCLUSIONS: As a plain CT marker of sufficient collateral status and increased cerebral blood volume, ISE indicates a better response to IV tPA. However, it should be noted that this relatively rare CT finding is highly specific for cerebral large vessel occlusions amenable neurothrombectomy.


Assuntos
Edema Encefálico/etiologia , Isquemia Encefálica/tratamento farmacológico , Fibrinolíticos/administração & dosagem , Acidente Vascular Cerebral/tratamento farmacológico , Terapia Trombolítica , Ativador de Plasminogênio Tecidual/administração & dosagem , Administração Intravenosa , Idoso , Idoso de 80 Anos ou mais , Edema Encefálico/diagnóstico por imagem , Edema Encefálico/fisiopatologia , Isquemia Encefálica/complicações , Isquemia Encefálica/diagnóstico , Isquemia Encefálica/fisiopatologia , Circulação Cerebrovascular/efeitos dos fármacos , Circulação Colateral/efeitos dos fármacos , Bases de Dados Factuais , Avaliação da Deficiência , Feminino , Fibrinolíticos/efeitos adversos , Humanos , Masculino , Pessoa de Meia-Idade , Recuperação de Função Fisiológica , Estudos Retrospectivos , Acidente Vascular Cerebral/complicações , Acidente Vascular Cerebral/diagnóstico , Acidente Vascular Cerebral/fisiopatologia , Terapia Trombolítica/efeitos adversos , Fatores de Tempo , Ativador de Plasminogênio Tecidual/efeitos adversos , Tomografia Computadorizada por Raios X , Resultado do Tratamento
20.
J Stroke Cerebrovasc Dis ; 29(10): 105118, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32912526

RESUMO

BACKGROUND: Frequent premature atrial contractions (PACs) are associated with atrial fibrillation, stroke, and mortality. However, the cut-off value for PAC counts that could identify patients with different stroke features is unclear, and the association of PACs to outcome is not determined. METHODS: The study retrospectively included patients with acute ischemic stroke who had underwent both a 24 h Holter recording and a brain MRI in Taipei Veterans General Hospital from January 2015 to May 2016. Patients were categorized into four groups according to their PAC frequencies on 24 h Holter recording. We compared the clinical severity, neuroimage features, stroke subtypes, and functional outcome among the four groups of patients. RESULTS: Among the 278 patients, the lower, middle, and upper quartiles of the PAC counts were 23, 74, and 459.5, respectively. In contrast to the 1st quartile of patients, the 3rd (PAC 75-459/24 h) and the 4th (PAC ≥460/24 h) quartiles of patients had higher NIH Stroke Scale (NIHSS) at admission (p = 0.014 and p = 0.002, respectively). The frequencies of cryptogenic stroke were not different among the 4 quartiles of the patients, but cryptogenic stroke patients with ≥ 75PACs/24hours had higher stroke severity compared to those with PACs < 75counts/24 h (NIHSS 9.1 vs. 5.2, p = 0.043). There was an increased trend in infarcts of multiple vascular territories and in mortality at 1 year among the four groups of patients with increased PAC frequency (p = 0.045 and p = 0.002, respectively). The 4th PAC quartile was associated with poor functional outcome (modified Rankin Scale ≥ 4) at 3 months in univariate analysis (OR: 5.66, CI: 2.69-11.91, p < 0.001), but was not an independent predictor after controlling for initial stroke severity. CONCLUSIONS: PACs ≥ 75 counts/24 h was associated with higher clinical severity in patients with acute ischemic stroke.


Assuntos
Complexos Atriais Prematuros/complicações , Isquemia Encefálica/etiologia , Frequência Cardíaca , Acidente Vascular Cerebral/etiologia , Idoso , Idoso de 80 Anos ou mais , Complexos Atriais Prematuros/diagnóstico , Complexos Atriais Prematuros/mortalidade , Complexos Atriais Prematuros/fisiopatologia , Isquemia Encefálica/diagnóstico por imagem , Isquemia Encefálica/mortalidade , Isquemia Encefálica/fisiopatologia , Imagem de Difusão por Ressonância Magnética , Avaliação da Deficiência , Eletrocardiografia Ambulatorial , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Prognóstico , Estudos Retrospectivos , Medição de Risco , Fatores de Risco , Índice de Gravidade de Doença , Acidente Vascular Cerebral/diagnóstico por imagem , Acidente Vascular Cerebral/mortalidade , Acidente Vascular Cerebral/fisiopatologia , Taiwan , Fatores de Tempo
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