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Stroke imaging

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https://www.readbyqxmd.com/read/29055086/acute-mitogen-activated-protein-kinase-1-2-inhibition-improves-functional-recovery-and-vascular-changes-after-ischemic-stroke-in-rat-monitored-by-9-4-t-magnetic-resonance-imaging
#1
Maryam Mostajeran, Friedrich Wetterling, Frank W Blixt, Lars Edvinsson, Saema Ansar
AIM: The aim was to evaluate the beneficial effect of early mitogen activated protein kinase (MEK)1/2 inhibition administered at a clinical relevant time-point using the transient middle cerebral artery occlusion model and a dedicated rodent magnetic resonance imaging system (9.4T) to monitor cerebrovascular changes non-invasively for two weeks. METHOD: Transient middle cerebral artery occlusion was induced in male rats for two hours followed by reperfusion. The specific MEK1/2 inhibitor U0126 was administered i...
October 21, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/29054914/flow-diversion-for-the-treatment-of-posterior-inferior-cerebellar-artery-aneurysms-a-novel-classification-and-strategies
#2
Visish M Srinivasan, Michael George Zaki Ghali, Oleg E Reznik, Jacob Cherian, Maxim Mokin, Travis M Dumont, John R Gaughen, Ramesh Grandhi, Ajit S Puri, Stephen R Chen, Jeremiah N Johnson, Peter Kan
BACKGROUND: The pipeline embolization device (PED) is frequently used in the treatment of anterior circulation aneurysms, especially around the carotid siphon, with generally excellent results. However, treatment of posterior inferior cerebellar artery (PICA) aneurysms with flow diversion (FD) has not been specifically described or discussed. While there are reports of treating PICA aneurysms using placement of FD stents in the vertebral artery, there are no reports of treating these lesions by placement of flow diverting stents in the PICA vessel itself...
October 20, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29054448/brain-ischemia-ct-and-mri-techniques-in-acute-ischemic-stroke
#3
REVIEW
Pedro Vilela, Howard A Rowley
Imaging plays a central role for intravenous and intra-arterial arterial ischemic stroke treatment patient selection. Computed tomography (CT) / CT angiography or magnetic resonance (MR) / MR angiography imaging are used to exclude stroke mimics and haemorrhage, to determine the cause and mechanism of stroke, to define the extension of brain infarct and to identify the arterial occlusion. Imaging may identify the patients that will be benefit more from revascularization therapies independently of the conventional therapeutic time window allowing individualized treatment decisions and improving individual patient outcome...
August 24, 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/29053905/distinct-predictive-role-of-collateral-status-on-clinical-outcome-in-variant-stroke-subtypes-of-acute-large-arterial-occlusion
#4
Xuting Zhang, Meixia Zhang, Wenhong Ding, Shenqiang Yan, David S Liebeskind, Min Lou
BACKGROUND: Clinical trials have showed that robust collateral flow has a relationship with good clinical outcome, however, different stroke subtypes were lumped together. This study explored the relationship between baseline collaterals and the onset-to-imaging time (OIT), and the correlation between pre-treatment collateral status and clinical outcome among different subtypes. METHOD: We reviewed prospectively collected data from consecutive acute ischemic stroke (AIS) patients with acute middle cerebral artery occlusion who received reperfusion therapy...
October 20, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29053773/less-is-more-neural-mechanisms-underlying-anomia-treatment-in-chronic-aphasic-patients
#5
Davide Nardo, Rachel Holland, Alexander P Leff, Cathy J Price, Jennifer T Crinion
Previous research with aphasic patients has shown that picture naming can be facilitated by concurrent phonemic cueing [e.g. initial phoneme(s) of the word that the patient is trying to retrieve], both as an immediate word retrieval technique, and when practiced repeatedly over time as a long-term anomia treatment. Here, to investigate the neural mechanisms supporting word retrieval, we adopted-for the first time-a functional magnetic resonance imaging task using the same naming procedure as it occurs during the anomia treatment process...
September 27, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29052571/susceptibility-weighted-imaging-in-thrombolytic-therapy-of-acute-ischemic-stroke
#6
REVIEW
Lin Li, Ming-Su Liu, Guang-Qin Li, Yang Zheng, Tong-Li Guo, Xin Kang, Mao-Ting Yuan
OBJECTIVE: To provide a comprehensive and latest overview of susceptibility-weighted imaging (SWI) in the application of thrombolysis in acute ischemic stroke, and to update the decision-making effect and clinical value of SWI on identifying stroke patients suitable for thrombolytic therapy and possible benefits and risks followed. DATA SOURCES: Literatures referred to this review were collected from PubMed, Medline, and EMBASE published till May 2017, using the search terms including susceptibility-weighted imaging, gradient-echo, T2*, thrombolysis, recombinant tissue plasminogen activator (rt-PA), thrombolytic therapy, and stroke...
October 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/29051996/diffusion-weighted-mri-stroke-volume-following-recanalization-treatment-is-threshold-dependent
#7
Rani Gupta Sah, Christopher D d'Esterre, Michael D Hill, Moiz Hafeez, Sana Tariq, Nils D Forkert, Andrew M Demchuk, Mayank Goyal, Philip A Barber
PURPOSE: Infarct lesion segmentation has been problematic as there are a wide range of relative and absolute diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC) thresholds that have been used for this purpose. We examined differences of stroke lesion volume and evolution evaluated by magnetic resonance imaging (MRI) during the immediate post-treatment phase (<5 h) and at 24 h. METHODS: In this study 33 acute ischemic stroke patients were imaged with MRI <5 h and 24 h post-reperfusion treatment...
October 19, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29050387/temporal-lobe-networks-supporting-the-comprehension-of-spoken-words
#8
Leonardo Bonilha, Argye E Hillis, Gregory Hickok, Dirk B den Ouden, Chris Rorden, Julius Fridriksson
Auditory word comprehension is a cognitive process that involves the transformation of auditory signals into abstract concepts. Traditional lesion-based studies of stroke survivors with aphasia have suggested that neocortical regions adjacent to auditory cortex are primarily responsible for word comprehension. However, recent primary progressive aphasia and normal neurophysiological studies have challenged this concept, suggesting that the left temporal pole is crucial for word comprehension. Due to its vasculature, the temporal pole is not commonly completely lesioned in stroke survivors and this heterogeneity may have prevented its identification in lesion-based studies of auditory comprehension...
September 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29049297/functional-connectivity-structure-of-cortical-calcium-dynamics-in-anesthetized-and-awake-mice
#9
Patrick W Wright, Lindsey M Brier, Adam Q Bauer, Grant A Baxter, Andrew W Kraft, Matthew D Reisman, Annie R Bice, Abraham Z Snyder, Jin-Moo Lee, Joseph P Culver
The interplay between hemodynamic-based markers of cortical activity (e.g. fMRI and optical intrinsic signal imaging), which are an indirect and relatively slow report of neural activity, and underlying synaptic electrical and metabolic activity through neurovascular coupling is a topic of ongoing research and debate. As application of resting state functional connectivity measures is extended further into topics such as brain development, aging and disease, the importance of understanding the fundamental physiological basis for functional connectivity will grow...
2017: PloS One
https://www.readbyqxmd.com/read/29049021/do-black-women-s-religious-beliefs-about-body-image-influence-their-confidence-in-their-ability-to-lose-weight
#10
Alexandria G Bauer, Jannette Berkley-Patton, Carole Bowe-Thompson, Therese Ruhland-Petty, Marcie Berman, Sheila Lister, Kelsey Christensen
INTRODUCTION: Black women are disproportionately burdened by obesity but maintain body satisfaction and strong religious commitment. Although faith-based weight-loss interventions have been effective at promoting weight loss among blacks, little is known about how body image and religious views contribute to weight-related beliefs among religious black women. The purpose of this study was to examine whether demographic and health history factors, religious involvement, and beliefs about body image could explain motivation and confidence to lose weight among a church-affiliated sample of black women...
October 19, 2017: Preventing Chronic Disease
https://www.readbyqxmd.com/read/29045598/prognostic-value-of-pulmonary-blood-volume-by-first-pass-contrast-enhanced-cmr-in-heart-failure-outpatients-the-prove-hf-study
#11
F Ricci, A Barison, G Todiere, C Mantini, A R Cotroneo, M Emdin, R De Caterina, S Galllina, G D Aquaro
Aims: Pulmonary blood volume (PBV) is a novel clinical application of cardiovascular magnetic resonance (CMR) imaging for the quantitative grading of haemodynamic congestion. In this study, we aimed to assess the prognostic value of PBV in a cohort of outpatients with chronic heart failure (HF). Methods and results: One hundred and twelve consecutive patients (91 men, 67 ± 12 years) and 53 age- and sex-matched healthy controls underwent echocardiography and contrast-enhanced CMR...
October 17, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29044926/optical-coherence-tomography-guided-carotid-artery-stent-procedure-technique-and-potential-applications
#12
Suhail Dohad, Alexander Zhu, Sandeep Krishnan, Frances Wang, Serena Wang, Justin Cox, Timothy D Henry
OBJECTIVES: To (1) present a guide on how to perform optical coherence tomography (OCT) in carotid artery stenting (CAS), to (2) highlight several instructive cases illustrating OCT-guidance as an interventional strategy, and to (3) present the largest case-series of OCT-guided CAS performed in North America, demonstrating its feasibility as an imaging modality in this setting. BACKGROUND: OCT is an intravascular imaging method that captures images with an axial resolution 10 times higher than intravascular ultrasound...
October 16, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/29044603/comorbid-masticatory-impairment-delays-recovery-from-acute-cerebral-ischemia-and-locomotor-hypoactivity-after-subarachnoid-hemorrhage-in-mice
#13
Ikuho Kojima, Tatsushi Mutoh, Kazumasu Sasaki, Yasuko Tatewaki, Yasuyuki Taki, Tatsuya Ishikawa
Tooth loss and related changes in the functionality may lead to worse outcome of stroke patients, but the link involved in this pathway remains unclear. This study aimed to determine the effect of comorbid masticatory impairment on acute cerebral ischemia and neurobehavioral outcome after experimental subarachnoid hemorrhage (SAH). Thirty C57BL/6 mice with (molar-less) or without (control) prior treatment of cutting off the upper molars (separated by at least one week), were subjected to SAH by endovascular perforation...
October 17, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29043143/focal-segmental-glomerulosclerosis-associated-with-mitochondrial-disease
#14
Kenneth Lim, David Steele, Andrew Fenves, Ravi Thadhani, Eliot Heher, Amel Karaa
Primary mitochondrial diseases (MD) are complex, heterogeneous inherited diseases caused by mutations in either the mitochondrial or nuclear DNA. Glomerular diseases in MD have been reported with tRNA mutation m.3243A>G causing a syndrome of mitochondrial encephalomyopathy, lactic acidosis and stroke-like episodes (MELAS). We describe here a case of focal segmental glomerulosclerosis (FSGS) associated with a new tRNA mutation site. A 34-year-old man with a history of living related kidney transplantation, diabetes, hearing loss, and developmental delay presented to the outpatient clinic with complaints of new behavioral difficulties, worsening symptoms, and brain involvement on imaging...
2017: Clin Nephrol Case Stud
https://www.readbyqxmd.com/read/29042780/frequencies-of-circulating-b-and-t-lymphocytes-as-indicators-for-stroke-outcomes
#15
Yanling Wang, Jihong Liu, Xuemei Wang, Zongjian Liu, Fengwu Li, Fenghua Chen, Xiaokun Geng, Zhili Ji, Huishan Du, Xiaoming Hu
BACKGROUND: Stroke has high mortality and morbidity. Biomarkers are required for to predict stroke outcomes, which could help clinicians to provide rationale approaches for patient management. The dynamic changes in circulating immune cells have been reported in stroke patients and animal models of stroke. AIM: The aim of this study was to explore biomarkers to predict stroke outcomes by investigating the relationship between the frequencies of circulating immune cells and stroke outcomes...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/29042701/direct-damage-to-a-vertebral-artery-better-predicts-a-vertebral-artery-injury-than-elongation-in-cervical-spine-dislocation
#16
Kosei Nagata, Hirotaka Chikuda, Koichi Inokuchi, Keisuke Ishii, Atsuki Kobayashi, Hiroyuki Kanai, Kota Miyoshi
Cervical spine dislocation and fracture of a transverse process are isolated risk factors for vertebral artery injuries (VAIs), which can cause a life-threatening ischemic stroke. Since in vivo experiments are not possible, it has not been unclear whether damage to or extension of vertebral arteries is more predictive of a VAI. To identify the imaging characteristics associated with VAI, we analyzed 36 vertebral arteries from 22 cervical spine dislocation patients who underwent computed tomography angiography (Aug...
October 2017: Acta Medica Okayama
https://www.readbyqxmd.com/read/29040967/improvement-and-aggravation-of-spontaneous-unruptured-vertebral-artery-dissection
#17
Tomoya Shibahara, Masahiro Yasaka, Yoshiyuki Wakugawa, Koichiro Maeda, Takeshi Uwatoko, Takahiro Kuwashiro, Gregory Y H Lip, Yasushi Okada
BACKGROUND: Intracranial vertebral artery dissection (VAD) is a well-recognized cause of stroke in young and middle-aged individuals, especially in Asian populations. However, a long-term natural course remains unclear. We investigated the long-term time course of VAD using imaging findings to examine the rate and predisposing factors for improvement. METHODS: We registered 56 consecutive patients (40 males; mean age, 51.8 ± 10.7 years) with acute spontaneous VAD and retrospectively investigated neuroimaging and clinical course within 1 month and at 3 months ± 2 weeks, 6 months ± 2 weeks, and 12 months ± 2 weeks after onset to ascertain predisposing factors and time course for improvement...
October 17, 2017: Cerebrovascular Diseases Extra
https://www.readbyqxmd.com/read/29040040/prevalence-of-carotid-web-in-patients-with-acute-intracranial-stroke-due-to-intracranial-large-vessel-occlusion
#18
Kars C J Compagne, Ad C G M van Es, Olvert A Berkhemer, Jordi Borst, Yvo B W E M Roos, Robert J van Oostenbrugge, Wim H van Zwam, Charles B L M Majoie, Henk A Marquering, Diederik W J Dippel, Aad van der Lugt, Bart J Emmer
Purpose To investigate the prevalence of symptomatic carotid web in patients with acute ischemic stroke due to intracranial large vessel occlusion, to determine the clinical and imaging profile of patients with carotid web as well as their association with ischemic stroke, and to determine the interobserver agreement in the assessment of carotid webs. Materials and Methods All patients (n = 500) of the Multicenter Randomized Clinical Trial of Endovascular Treatment for Acute Ischemic Stroke in the Netherlands (MR CLEAN) in whom the carotid bifurcation could be assessed (n = 443) were included...
October 16, 2017: Radiology
https://www.readbyqxmd.com/read/29038494/a-study-of-the-brain-abnormalities-of-post-stroke-depression-in-frontal-lobe-lesion
#19
Yu Shi, Yanyan Zeng, Lei Wu, Wei Liu, Ziping Liu, Shanshan Zhang, Jianming Yang, Wen Wu
Post stroke depression (PSD) is a serious complication of stroke. Brain imaging is an important method of studying the mechanism of PSD. However, few studies have focused on the single lesion location. The aim of this study was to investigate the brain mechanism of frontal lobe PSD using combined voxel-based morphometry (VBM) and functional magnetic resonance imaging (fMRI). In total, 30 first-time ischemic frontal lobe stroke patients underwent T1 weighted MRI and resting-state fMRI scans. Clinical assessments included the 24-item Hamilton Rating Scale for Depression, the National Institutes of Health Stroke Scale, and the Mini-Mental State Examination...
October 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29037758/the-association-of-vertebrobasilar-calcification-with-etiological-subtypes-stroke-recurrence-and-outcome-in-acute-brainstem-ischemic-stroke
#20
Elif Gökçal, Elvin Niftaliyev, Tuğçe Özdemir, Mehmet Kolukısa, Talip Asil
Arterial calcification (AC), a frequent finding on imaging studies, has been reported as a risk factor for ischemic stroke. However few studies have explored the association of AC with etiological subtypes and prognostic implications. The purpose of this study was to investigate the association of AC with demograhics, risk factors and etiological subtypes and to determine whether it predicts stroke recurrence and functional outcome in patients with acute brainstem ischemic stroke. We analyzed our database consisting of patients who were diagnosed as acute brainstem ischemic stroke admitted within 24hours of onset...
October 9, 2017: Neurologia i Neurochirurgia Polska
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