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Stroke imaging

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https://www.readbyqxmd.com/read/28550100/an-alternative-surgical-approach-reduces-variability-following-filament-induction-of-experimental-stroke-in-mice
#1
M Trotman-Lucas, M E Kelly, J Janus, R Fern, C L Gibson
Animal models are critical for understanding the pathology of stroke and investigating potential treatments. However, in vivo stroke models are associated, particularly in mice, with high variability in lesion volume. We investigated whether a surgical refinement where reperfusion is not reliant on the Circle of Willis reduced outcome variability. Mice underwent 60 minutes of transient middle cerebral artery occlusion avoiding ligation of the external carotid artery. During reperfusion the common carotid artery was either ligated (standard approach), or it was repaired to allow re-establishment of blood flow through the common carotid artery...
May 26, 2017: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/28549916/utility-of-carotid-ultrasonography-in-management-of-an-atypical-high-vascular-risk-patient-with-recurrent-calcified-cerebral-embolic-stroke
#2
John W Liang, Jesse Weinberger, Aaron Tansy
OBJECTIVE: To describe a case of recurrent calcified cerebral emboli (CCE)-related acute ischemic stroke (AIS) and the diagnostic utility of plaque morphology characterization on carotid ultrasound. BACKGROUND: CCE are a rare cause of AIS. CCE-related AIS has been previously reported only in high vascular-risk patients such as those with severe carotid stenosis, widespread atheromatous disease, or cardiac valvular disease. CCE-related AIS from a carotid origin has not been reported in patients without carotid stenosis...
May 23, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28549641/treatment-of-moyamoya-disease-and-unruptured-intracranial-aneurysm-in-floating-harbor-syndrome-a-case-report
#3
Daniel J Coughlin, Charles A Miller, A Jesse Schuette
BACKGROUND: This is the first report of the successful treatment of moyamoya disease (MMD) and an unruptured intracranial aneurysm in a patient with Floating-Harbor Syndrome (FHS). CASE DESCRIPTION: A 35 year-old, phenotypically syndromic woman presented with signs and symptoms consistent with ischemic stroke. MRI and catheter angiography confirmed diagnosis of moyamoya and a 6 mm basilar apex artery aneurysm (BAA). She underwent right sided craniotomy for direct and indirect revascularization by means of superficial temporal artery-middle cerebral artery (STA-MCA) bypass and encephalo-duro-arterio-synangiosis (EDAS)...
May 23, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28549269/high-hair-cortisol-concentrations-predict-worse-cognitive-outcome-after-stroke-results-from-the-tabasco-prospective-cohort-study
#4
E Ben Assayag, O Tene, A D Korczyn, L Shopin, E Auriel, J Molad, H Hallevi, C Kirschbaum, N M Bornstein, S Shenhar-Tsarfaty, E Kliper, T Stalder
BACKGROUND AND PURPOSE: The role of stress-related endocrine dysregulation in the development of cognitive changes following a stroke needs further elucidation. We explored this issue in a longitudinal study on stroke survivors using hair cortisol concentrations (HCC), a measure of integrated long-term cortisol levels. METHODS: Participants were consecutive cognitively intact first-ever mild-moderate ischemic stroke/transient ischemic attack (TIA) survivors from the Tel Aviv Brain Acute Stroke Cohort (TABASCO) study...
May 18, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28549087/thalamic-alterations-remote-to-infarct-appear-as-focal-iron-accumulation-and-impact-clinical-outcome
#5
Grégory Kuchcinski, Fanny Munsch, Renaud Lopes, Antoine Bigourdan, Jason Su, Sharmila Sagnier, Pauline Renou, Jean-Pierre Pruvo, Brian K Rutt, Vincent Dousset, Igor Sibon, Thomas Tourdias
Thalamic alterations have been observed in infarcts initially sparing the thalamus but interrupting thalamo-cortical or cortico-thalamic projections. We aimed at extending this knowledge by demonstrating with in vivo imaging sensitive to iron accumulation, one marker of neurodegeneration, that (i) secondary thalamic alterations are focally located in specific thalamic nuclei depending on the initial infarct location; and (ii) such secondary alterations can contribute independently to the long-term outcome. To tackle this issue, 172 patients with an infarct initially sparing the thalamus were prospectively evaluated clinically and with magnetic resonance imaging to quantify iron through R2* map at 24-72 h and at 1-year follow-up...
May 25, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28548988/toward-precision-medicine-tailoring-interventional-strategies-based-on-noninvasive-brain-stimulation-for-motor-recovery-after-stroke
#6
Philipp J Koch, Friedhelm C Hummel
PURPOSE OF REVIEW: To support the recovery of disability and the reduced functional capacity influencing the independence of daily life after focal brain lesions like stroke, the application of noninvasive brain stimulation (NIBS) by repetitive transcranial magnetic stimulation or transcranial electric stimulation has been found useful in the last decades. Still, a positive influence on the recovery seems to be restricted to specific subgroups of patients. Therefore, a closer look on individual parameters influencing the recovery course and the effect of NIBS is needed...
May 25, 2017: Current Opinion in Neurology
https://www.readbyqxmd.com/read/28547878/mesiotemporal-atrophy-and-hippocampal-diffusivity-distinguish-amnestic-from-non-amnestic-vascular-cognitive-impairment
#7
A A Hosseini, D Meng, R J Simpson, D P Auer
BACKGROUND AND PURPOSE: The role of clinical factors, cerebral infarcts and hippocampal damage in vascular cognitive impairment (VCI) subtypes remains unclear. METHODS: Non-demented patients with carotid stenosis and recent transient ischemic attack/stroke had cognitive assessment and brain magnetic resonance imaging (MRI). Amnestic VCI was defined as memory impairment; non-amnestic VCI was any other subdomain impairment. Associations of MRI metrics [log-transformed total ischemic lesion load (log TILL), mesiotemporal atrophy (MTA) score, hippocampal mean diffusivity (hipMD)] with cognitive performance were assessed...
May 26, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28546326/regional-pediatric-acute-stroke-protocol-initial-experience-during-3-years-and-13-recanalization-treatments-in-children
#8
Laurence Tabone, Nicolas Mediamolle, Celine Bellesme, Fabrice Lesage, David Grevent, Augustin Ozanne, Olivier Naggara, Beatrice Husson, Isabelle Desguerre, Catherine Lamy, Christian Denier, Manoelle Kossorotoff
BACKGROUND AND PURPOSE: To evaluate hyperacute management of pediatric arterial ischemic stroke, setting up dedicated management pathways is the first recommended step to prove the feasibility and safety of such treatments. A regional pediatric stroke alert protocol including 2 centers in the Paris-Ile-de-France area, France, was established. METHODS: Consecutive pediatric patients (28 days-18 years) with confirmed arterial ischemic stroke who had acute recanalization treatment (intravenous r-tPA [recombinant tissue-type plasminogen activator], endovascular procedure, or both) according to the regional pediatric stroke alert were retrospectively reviewed during a 40-month period...
May 25, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28546252/acute-basilar-artery-occlusion-differences-in-characteristics-and-outcomes-after-endovascular-therapy-between-patients-with-and-without-underlying-severe-atherosclerotic-stenosis
#9
Y Y Lee, W Yoon, S K Kim, B H Baek, G S Kim, J T Kim, M S Park
BACKGROUND AND PURPOSE: Prediction of underlying intracranial atherosclerotic stenosis before endovascular therapy might be helpful for appropriate therapeutic planning in patients with acute ischemic stroke. This study aimed to compare the characteristics and treatment outcomes in patients with acute basilar artery occlusion relative to the existence or nonexistence of underlying intracranial atherosclerotic stenosis. MATERIALS AND METHODS: Sixty-two patients with acute basilar artery occlusion underwent multimodal endovascular therapy...
May 25, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28543314/subclinical-hypothyroidism-and-risk-of-cerebral-small-vessel-disease-a-hospital-based-observational-study
#10
Xiaohao Zhang, Yi Xie, Caixia Ding, Jing Xiao, Yinyan Tang, Xuemei Jiang, Hua Shan, Yuankai Lin, Yujia Zhu, Chuanyou Li, Dan Hu, Zhixiang Ling, Gelin Xu, Lei Sheng
OBJECTIVE: Subclinical hypothyroidism (SCH) has been associated with atherosclerosis and increased risk of ischemic stroke. However, whether SCH is associated with cerebral small vessel disease (cSVD) remains largely unexplored. This study aimed to investigate the relationship between SCH and total cSVD burden, a composite measurement detected with magnetic resonance imaging (MRI), in patients with minor ischemic stroke or transient ischemic attack (TIA). DESIGN: This was a prospective observational cohort study conducted in a tertiary referral hospital...
May 25, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28542605/voxelwise-distribution-of-acute-ischemic-stroke-lesions-in-patients-with-newly-diagnosed-atrial-fibrillation-trigger-of-arrhythmia-or-only-target-of-embolism
#11
Timolaos Rizos, Andreas J Bartsch, Timothy D Johnson, Felix Dittgen, Thomas E Nichols, Uwe Malzahn, Roland Veltkamp
OBJECTIVE: Atrial fibrillation (AF) is frequently detected after ischemic stroke for the first time, and brain regions involved in autonomic control have been suspected to trigger AF. We examined whether specific brain regions are associated with newly detected AF after ischemic stroke. METHODS: Patients with acute cerebral infarctions on diffusion-weighted magnetic resonance imaging were included in this lesion mapping study. Lesions were mapped and modeled voxelwise using Bayesian Spatial Generalised Linear Mixed Modeling to determine differences in infarct locations between stroke patients with new AF, without AF and with AF already known before the stroke...
2017: PloS One
https://www.readbyqxmd.com/read/28542215/treatment-with-enalapril-and-not-diltiazem-ameliorated-progression-of-chronic-kidney-disease-in-rats-and-normalized-renal-at1-receptor-expression-as-measured-with-pet-imaging
#12
Basma Ismail, Rob A deKemp, Etienne Croteau, Tayebeh Hadizad, Kevin D Burns, Rob S Beanlands, Jean N DaSilva
ACE inhibitors are considered first line of treatment in patients with many forms of chronic kidney disease (CKD). Other antihypertensives such as calcium channel blockers achieve similar therapeutic effectiveness in attenuating hypertension-related renal damage progression. Our objective was to explore the value of positron emission tomography (PET) imaging of renal AT1 receptor (AT1R) to guide therapy in the 5/6 subtotal-nephrectomy (Nx) rat model of CKD. Ten weeks after Nx, Sprague-Dawley rats were administered 10mg/kg/d enalapril (NxE), 30mg/kg/d diltiazem (NxD) or left untreated (Nx) for an additional 8-10 weeks...
2017: PloS One
https://www.readbyqxmd.com/read/28542096/modified-dual-energy-algorithm-for-calcified-plaque-removal-evaluation-in-carotid-computed-tomography-angiography-and-comparison-with-digital-subtraction-angiography
#13
Manoj Mannil, Jaychandran Ramachandran, Ilaria Vittoria de Martini, Susanne Wegener, Bernhard Schmidt, Thomas Flohr, Bernhard Krauss, Antonios Valavanis, Hatem Alkadhi, Sebastian Winklhofer
OBJECTIVES: Computed tomography angiography (CTA) is a valuable tool for the assessment of carotid artery stenosis. However, blooming artifacts from calcified plaques might result in an overestimation of the stenosis grade. The aim of this study was to investigate a new dual-energy computed tomography (DECT) technique with a modified 3-material decomposition algorithm for calcium removal in extracranial carotid artery stenosis. MATERIALS AND METHODS: In this retrospective, institutional review board-approved study, 30 calcified carotid plaques in 22 patients (15 men; mean age, 73 ± 10 years) with clinical suspicion of stroke were included...
May 24, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28541195/monitoring-acute-stroke-in-mouse-model-using-laser-speckle-imaging-guided-visible-light-optical-coherence-tomography
#14
Qi Liu, Siyu Chen, Brian Soetikno, Wenzhong Liu, Shanbao Tong, Hao Zhang
OBJECTIVE: Monitoring hemodynamic and vascular changes in the acute stages of mouse stroke models is invaluable in studying ischemic stroke pathophysiology. However, there lacks a tool to simultaneously and dynamically investigate these changes. METHODS: We integrated laser speckle imaging (LSI) and visible-light optical coherence tomography (Vis-OCT) to reveal dynamic vascular responses in acute stages in the distal middle cerebral artery occlusion (dMCAO) model in rodents...
May 23, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28541130/measuring-functional-connectivity-in-stroke-approaches-and-considerations
#15
Joshua S Siegel, Gordon L Shulman, Maurizio Corbetta
Recent research has demonstrated the importance of global changes to the functional organization of brain network following stroke. Resting functional magnetic resonance imaging (R-fMRI) is a non-invasive tool that enables the measurement of functional connectivity (FC) across the entire brain while placing minimal demands on the subject. For these reasons, it is a uniquely appealing tool for studying the distant effects of stroke. However, R-fMRI studies rely on a number of premises that cannot be assumed without careful validation in the context of stroke...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28540481/impact-of-perfusion-lesion-in-corticospinal-tract-on-response-to-reperfusion
#16
Ying Zhou, Ruiting Zhang, Sheng Zhang, Shenqiang Yan, Ze Wang, Bruce C V Campbell, David S Liebeskind, Min Lou
OBJECTIVES: We aimed to examine the impact of corticospinal tract (CST) involvement in acute ischaemic stroke (AIS) patients on functional outcome and the interaction with reperfusion. METHODS: We retrospectively examined data in consecutive anterior circulation AIS patients undergoing thrombolysis. MR perfusion (time to maximum of tissue residue function, Tmax) and apparent diffusion coefficient (ADC) images were transformed into standard space and the volumes of CST involvement by Tmax > 6 s (CST-Tmax) and ADC < 620 × 10(-6) mm(2)/s (CST-ADC) lesions were calculated...
May 24, 2017: European Radiology
https://www.readbyqxmd.com/read/28540400/imaging-of-cerebral-ischemic-edema-and-neuronal-death
#17
REVIEW
Rüdiger von Kummer, Imanuel Dzialowski
PURPOSE: In acute cerebral ischemia, the assessment of irreversible injury is crucial for treatment decisions and the patient's prognosis. There is still uncertainty how imaging can safely differentiate reversible from irreversible ischemic brain tissue in the acute phase of stroke. METHODS: We have searched PubMed and Google Scholar for experimental and clinical papers describing the pathology and pathophysiology of cerebral ischemia under controlled conditions...
May 24, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28540180/hemoglobin-and-mean-platelet-volume-predicts-diffuse-t1-mri-white-matter-volume-decrease-in-sickle-cell-disease-patients
#18
Soyoung Choi, Adam M Bush, Matthew T Borzage, Anand A Joshi, William J Mack, Thomas D Coates, Richard M Leahy, John C Wood
Sickle cell disease (SCD) is a life-threatening genetic condition. Patients suffer from chronic systemic and cerebral vascular disease that leads to early and cumulative neurological damage. Few studies have quantified the effects of this disease on brain morphometry and even fewer efforts have been devoted to older patients despite the progressive nature of the disease. This study quantifies global and regional brain volumes in adolescent and young adult patients with SCD and racially matched controls with the aim of distinguishing between age related changes associated with normal brain maturation and damage from sickle cell disease...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28538414/clinical-predictors-for-the-manifestation-of-late-gadolinium-enhancement-after-acute-myocardial-infarction
#19
Nadine Abanador-Kamper, Lars Kamper, Marc Vorpahl, Hilmar Brinkmann, Vasiliki Karamani, Patrick Haage, Melchior Seyfarth
Despite prompt revascularization, some patients with acute myocardial infarction (AMI) develop myocardial scars, which can be visualized by late gadolinium enhancement (LGE) in cardiovascular magnetic resonance imaging (CMR). Our goal was to identify angiographic findings that were predictive for scar development in patients after reperfused AMI.We examined 136 patients after first ST-elevated myocardial infarction by CMR after a median of 4 days (range: 2-7). Patients with manifestation of LGE were matched to patients without LGE by means of age and gender...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28538402/dissection-extending-from-extra-to-intracranial-arteries-a-case-report-of-progressive-ischemic-stroke
#20
Fu-Liang Zhang, Zhen-Ni Guo, Yang Liu, Yun Luo, Yi Yang
RATIONALE: Cervicocephalic artery dissections, once considered a rare disease, have become increasingly recognized as a cause of stroke in young and middle-aged individuals. Early diagnosis is mandatory because anticoagulation or antithrombotic therapy can help prevent primary or secondary ischemic events. However, the diagnosis is still a crucial challenge for radiologists and neurologists. PATIENT CONCERNS: We reported a rare case of 33-year-old patient with progressive ischemic stroke due to dissection from an intimal tear in the right proximal internal carotid artery to distal middle cerebral artery...
May 2017: Medicine (Baltimore)
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