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https://www.readbyqxmd.com/read/27922004/annually-resolved-north-atlantic-marine-climate-over-the-last-millennium
#1
D J Reynolds, J D Scourse, P R Halloran, A J Nederbragt, A D Wanamaker, P G Butler, C A Richardson, J Heinemeier, J Eiríksson, K L Knudsen, I R Hall
Owing to the lack of absolutely dated oceanographic information before the modern instrumental period, there is currently significant debate as to the role played by North Atlantic Ocean dynamics in previous climate transitions (for example, Medieval Climate Anomaly-Little Ice Age, MCA-LIA). Here we present analyses of a millennial-length, annually resolved and absolutely dated marine δ(18)O archive. We interpret our record of oxygen isotope ratios from the shells of the long-lived marine bivalve Arctica islandica (δ(18)O-shell), from the North Icelandic shelf, in relation to seawater density variability and demonstrate that solar and volcanic forcing coupled with ocean circulation dynamics are key drivers of climate variability over the last millennium...
December 6, 2016: Nature Communications
https://www.readbyqxmd.com/read/27917937/vessel-wall-differences-between-middle-cerebral-artery-and-basilar-artery-plaques-on-magnetic-resonance-imaging
#2
Peng-Peng Niu, Yao Yu, Hong-Wei Zhou, Yang Liu, Yun Luo, Zhen-Ni Guo, Hang Jin, Yi Yang
A recent study showed that posterior circulation plaques have a greater capacity for positive remodeling in a non-Asian population. We aimed to investigate if the features of plaques in the middle cerebral artery (MCA) were different from those in the basilar artery (BA) in a northern Chinese population. We retrospectively analysed the records of 71 consecutive patients with acute ischemic stroke. All patients had at least one MCA or BA plaque with early or mild (<50% stenosis) atherosclerosis identified using vessel wall magnetic resonance imaging...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27913263/experience-with-adapt-for-thrombectomy-in-distal-cerebral-artery-occlusions-causing-acute-ischemic-stroke
#3
Jan Vargas, Alex M Spiotta, Kyle Fargen, Raymond D Turner, Imran Chaudry, Aquilla Turk
BACKGROUND: Thromboembolic occlusion of distal branches in anterior and posterior circulation may produce severe clinical deficits. The ADAPT technique is a simple, fast method for achieving good angiographic and clinical outcomes using large bore catheters in large vessel occlusions. OBJECTIVE: We present our results using the ADAPT technique with distal cerebral artery occlusions. METHODS: Thirty-five patients with acute ischemic stroke with thrombus in the distal MCA, ACA, or PCA were treated with the ADAPT technique...
November 29, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27909265/prevention-of-the-collapse-of-pial-collaterals-by-remote-ischemic-perconditioning-during-acute-ischemic-stroke
#4
Junqiang Ma, Yonglie Ma, Bin Dong, Mischa V Bandet, Ashfaq Shuaib, Ian R Winship
Collateral circulation is a key variable determining prognosis and response to recanalization therapy during acute ischemic stroke. Remote ischemic perconditioning (RIPerC) involves inducing peripheral ischemia (typically in the limbs) during stroke and may reduce perfusion deficits and brain damage due to cerebral ischemia. In this study, we directly investigated pial collateral flow augmentation due to RIPerC during distal middle cerebral artery occlusion (MCAo) in rats. Blood flow through pial collaterals between the anterior cerebral artery (ACA) and the MCA was assessed in male Sprague Dawley rats using in vivo laser speckle contrast imaging (LSCI) and two photon laser scanning microscopy (TPLSM) during distal MCAo...
December 1, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27905383/-the-role-of-atp-dependent-potassium-channels-and-nitric-oxide-system-in-the-neuroprotective-effect-of-preconditioning
#5
O G Deryagin, S A Gavrilova, S V Buravkov, V V Andrianov, G G Yafarova, Kh L Gainutdinov, V B Koshelev
AIM: To study a role of ATP-dependent potassium channels (K+ATP) in the neuroprotective effect of ischemic (IP) and pharmacological (PP) preconditioning and evaluate the dynamics of blood nitric oxide (NO) metabolites in cerebral ischemia. MATERIAL AND METHODS: A model of ischemic stroke induced by the electrocoagulation of a middle cerebral artery (MCA) branch was used in male rats (n=86). Glibenclamide, a selective inhibitor of ATP-sensitive K+ channels, and diazoxide, a potassium channel activator, were used...
2016: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/27904702/ethanol-extracts-from-portulaca-oleracea-l-attenuated-ischemia-reperfusion-induced-rat-neural-injury-through-inhibition-of-hmgb1-induced-inflammation
#6
Chenggang Zheng, Chen Liu, Wanyin Wang, Gusheng Tang, Liwei Dong, Juan Zhou, Zhengrong Zhong
It is well demonstrated that the high mobility group box 1 (HMGB1) mediated inflammation has been implicated as one of the important causes for brain damage induced by cerebral ischemia/reperfusion (I/R). In the present study, we assessed the neuro-protective and anti-inflammation effects of the ethanol extracts from Portulaca oleracea L. (EEPO) against cerebral I/R injury in the rat transient middle cerebral artery occlusion (tMCAO) model. Rats were administrated with their respective treatment for 7 days before the MCA occlusion...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27899518/variable-mr-and-pathologic-patterns-of-hemorrhage-after-iodinated-contrast-infusion-in-mca-occlusion-reperfusion-model
#7
Humberto Morales, Aigang Lu, Yuko Kurosawa, Joseph F Clark, Thomas Tomsick
OBJECTIVE: To examine the hypothesis that IA reperfusion with iso-osmolar iodixanol, low-osmolar iopamidol, or saline causes different effects on MR signal changes and pathologic cut-brain section related to hemorrhagic transformation (HT) or iodinated radiographic contrast media (IRCM) deposition. METHODS: Infarct was induced in 30 rats by middle cerebral artery suture occlusion. Reperfusion was performed after 5 hours with iso-osmolar iodixanol (n=9), low-osmolar iopamidol (n=12) or saline (n=9)...
November 29, 2016: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/27899338/high-touch-and-high-tech-ht2-proposal-transforming-patient-engagement-throughout-the-continuum-of-care-by-engaging-patients-with-portal-technology-at-the-bedside
#8
Ann Scheck McAlearney, Cynthia J Sieck, Jennifer L Hefner, Alison M Aldrich, Daniel M Walker, Milisa K Rizer, Susan D Moffatt-Bruce, Timothy R Huerta
BACKGROUND: For patients with complex care needs, engagement in disease management activities is critical. Chronic illnesses touch almost every person in the United States. The costs are real, personal, and pervasive. In response, patients often seek tools to help them manage their health. Patient portals, personal health records tethered to an electronic health record, show promise as tools that patients value and that can improve health. Although patient portals currently focus on the outpatient experience, the Ohio State University Wexner Medical Center (OSUWMC) has deployed a portal designed specifically for the inpatient experience that is connected to the ambulatory patient portal available after discharge...
November 29, 2016: JMIR Research Protocols
https://www.readbyqxmd.com/read/27898024/perinatal-arterial-ischemic-stroke-is-associated-to-materno-fetal-immune-activation-and-intracranial-arteritis
#9
Clémence Guiraut, Nicole Cauchon, Martin Lepage, Guillaume Sébire
The medium-size intra-cranial arteries arising from the carotid bifurcation are prone to perinatal arterial ischemic strokes (PAIS). PAIS' physiopathology needs to be better understood to develop preventive and therapeutic interventions that are currently missing. We hypothesized that materno-fetal inflammation leads to a vasculitis affecting selectively the carotidian tree and promoting a focal thrombosis and subsequent stroke. Dams were injected with saline or lipopolysaccharide (LPS) from Escherichia coli...
November 25, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27895099/new-thiazacridine-agents-synthesis-physical-and-chemical-characterization-and-in-vitro-anticancer-evaluation
#10
Mbo Chagas, Ncc Cordeiro, Kmr Marques, M G Rocha Pitta, Mjbm Rêgo, McA Lima, Mgr Pitta, I R Pitta
A series of new thiazacridine agents were synthesized and evaluated as antitumor agents, in terms of not only their cytotoxicity but also their selectivity. The cytotoxicity assay confirmed that all compounds showed cytotoxic activity and selectivity. The new compound, 3-acridin-9-ylmethyl-5-(5-bromo-1H-indol-3-ylmethylene)-thiazolidine-2,4-dione (LPSF/AA29 - 7A: ), proved to be the most promising compound as it presents lower half-maximal inhibitory concentration (IC50) values (ranging from 0.25 to 68.03 µM) depending on cell lineage...
November 27, 2016: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/27894312/release-of-copper-amended-particles-from-micronized-copper-pressure-treated-wood-during-mechanical-abrasion
#11
Chiara Civardi, Lukas Schlagenhauf, Jean-Pierre Kaiser, Cordula Hirsch, Claudio Mucchino, Adrian Wichser, Peter Wick, Francis W M R Schwarze
BACKGROUND: We investigated the particles released due to abrasion of wood surfaces pressure-treated with micronized copper azole (MCA) wood preservative and we gathered preliminary data on its in vitro cytotoxicity for lung cells. The data were compared with particles released after abrasion of untreated, water (0% MCA)-pressure-treated, chromated copper (CC)-pressure-treated wood, and varnished wood. Size, morphology, and composition of the released particles were analyzed. RESULTS: Our results indicate that the abrasion of MCA-pressure-treated wood does not cause an additional release of nanoparticles from the unreacted copper (Cu) carbonate nanoparticles from of the MCA formulation...
November 28, 2016: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/27891422/panvascular-disease-in-familial-hypercholesterolaemia-treated-with-endovascular-simultaneous-bilateral-carotid-stenting
#12
Anand Alurkar, Lakshmi Sudha Prasanna Karanam, Shripal Shah, Pandurang Mare
Familial Hypercholesterolaemia (FH) is a monogenic autosomal dominant disorder affecting 1 in 500 individuals. We report a case of 32-year-old female with FH, previously not on any treatment, who presented with recurrent bilateral Middle Cerebral Artery (MCA) territory strokes and dyspnoea on exertion due to severe panvascualar disease involving descending aorta, innominate, subclavian, common carotid, internal carotid and coronary vessels. Her complete clinical work up was done and was started on lipid lowering drug treatment and low calorie diet...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27890723/global-gene-expression-changes-in-the-prefrontal-cortex-of-rabbits-with-hypercholesterolemia-and-or-hypertension
#13
Sau-Yeen Loke, Peter Tsun-Hon Wong, Wei-Yi Ong
Although many studies have identified a link between hypercholesterolemia or hypertension and cognitive deficits, till date, comprehensive gene expression analyses of the brain under these conditions is still lacking. The present study was carried out to elucidate differential gene expression changes in the prefrontal cortex (PFC) of New Zealand white rabbits exposed to hypercholesterolemia and/or hypertension with a view of identifying gene networks at risk. Microarray analyses of the PFC of hypercholesterolemic rabbits showed 850 differentially expressed genes (DEGs) in the cortex of hypercholesterolemic rabbits compared to controls, but only 5 DEGs in hypertensive rabbits compared to controls...
November 24, 2016: Neurochemistry International
https://www.readbyqxmd.com/read/27886584/attributes-of-successful-actions-to-restore-lakes-and-estuaries-degraded-by-nutrient-pollution
#14
Catharine Gross, James D Hagy
As more success is achieved in restoring lakes and estuaries from the impacts of nutrient pollution, there is increased opportunity to evaluate the scientific, social, and policy factors associated with achieving restoration goals. We examined case studies where deliberate actions to reduce nutrient pollution and restore ecosystems resulted in ecological recovery. Prospective cases were identified from scientific literature and technical documents for lakes and estuaries with: (1) scientific evidence of nutrient pollution; (2) restoration actions taken to mitigate nutrient pollution; and (3) documented ecological improvement...
November 22, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27886084/intracranial-thrombus-morphology-and-composition-undergoes-time-dependent-changes-in-acute-ischemic-stroke-a-ct-densitometry-study
#15
Slaven Pikija, Jozef Magdic, Vladimir Trkulja, Peter Unterkreuter, Johannes Sebastian Mutzenbach, Helmut F Novak, Friedrich Weymayr, Larissa Hauer, Johann Sellner
The aim of our study was to assess whether cerebral artery clots undergo time-dependent morphological and compositional changes in acute ischemic stroke. We performed a retrospective chart review of patients admitted within 5 h from symptom onset to three European stroke centers and evaluated non-contrast-enhanced CT (NECT) for hyperdense artery signs (HAS) in 2565 scans. The occlusion site, density of HAS expressed in Hounsfield units (HU), area of HAS, and relative density (rHU) (HU clot/HU non-affected artery) were studied and related to time from symptom onset, clinical severity, stroke etiology, and laboratory parameters...
November 23, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27884858/hemicraniectomy-versus-medical-treatment-with-large-mca-infarct-a-review-and-meta-analysis
#16
Paul Alexander, Diane Heels-Ansdell, Reed Siemieniuk, Neera Bhatnagar, Yaping Chang, Yutong Fei, Yuqing Zhang, Shelley McLeod, Kameshwar Prasad, Gordon Guyatt
OBJECTIVE: Large middle cerebral artery stroke (space-occupying middle-cerebral-artery (MCA) infarction (SO-MCAi)) results in a very high incidence of death and severe disability. Decompressive hemicraniectomy (DHC) for SO-MCAi results in large reductions in mortality; the level of function in the survivors, and implications, remain controversial. To address the controversy, we pooled available randomised controlled trials (RCTs) that examined the impact of DHC on survival and functional ability in patients with large SO-MCAi and cerebral oedema...
November 24, 2016: BMJ Open
https://www.readbyqxmd.com/read/27882440/hemodynamic-changes-in-a-middle-cerebral-artery-aneurysm-at-follow-up-times-before-and-after-its-rupture-a-case-report-and-a-review-of-the-literature
#17
A Sejkorová, K D Dennis, H Švihlová, O Petr, G Lanzino, A Hejčl, D Dragomir-Daescu
Hemodynamic parameters play a significant role in the development of cerebral aneurysms. Parameters such as wall shear stress (WSS) or velocity could change in time and may contribute to aneurysm growth and rupture. However, the hemodynamic changes at the rupture location remain unclear because it is difficult to obtain data prior to rupture. We analyzed a case of a ruptured middle cerebral artery (MCA) aneurysm for which we acquired imaging data at three time points, including at rupture. A patient with an observed MCA aneurysm was admitted to the emergency department with clinical symptoms of a subarachnoid hemorrhage...
November 24, 2016: Neurosurgical Review
https://www.readbyqxmd.com/read/27876658/stenting-for-carotid-web-a-case-report
#18
R Martínez-Pérez, S P Lownie, S Pandey, M R Boulton
BACKGROUND: The carotid web is an intraluminal shelf-like projection arising from the posterior wall of the carotid bifurcation, and is an uncommon etiology of ischemic strokes. Our objective is to describe the feasibility of endovascular stenting to treat this condition CASE REPORT: In a 47-year-old female with a sudden occlusion of her right middle cerebral artery. CT angiogram and digital subtraction angiography showed the presence of a carotid web in the ipsilateral carotid bifurcation...
November 19, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27873519/use-of-three-dimensional-curved-multiplanar-reconstruction-images-for-sylvian-dissection-in-microsurgery-of-middle-cerebral-artery-aneurysms
#19
Taek Kyun Nam, Yong Sook Park, Jun Soo Byun, Seung Won Park, Jeong Taik Kwon
PURPOSE: The purpose of this study was to introduce a method of using three-dimensional (3D) curved-multiplanar reconstruction (MPR) images for sylvian dissection during microsurgical treatment of middle cerebral artery (MCA) aneurysms. MATERIALS AND METHODS: Forty-nine patients who had undergone surgery for MCA aneurysms were enrolled. We obtained the 3D curved-MPR images along the sphenoid ridge using OsiriX MD™ imaging software, compared sylvian dissection time according to several 3D MPR image factors, and investigated the correlations between these images and intraoperative findings...
January 2017: Yonsei Medical Journal
https://www.readbyqxmd.com/read/27873504/lenticulostriate-artery-involvement-is-predictive-of-poor-outcomes-in-superficial-middle-cerebral-artery-territory-infarction
#20
Kijeong Lee, Eun Hye Kim, Dongbeom Song, Young Dae Kim, Hyo Suk Nam, Hye Sun Lee, Ji Hoe Heo
PURPOSE: Patients with superficial middle cerebral artery (MCA) territory infarction may have concomitant lenticulostriate artery (LSA) territory infarction. We investigated the mechanisms thereof and the outcomes of patients with superficial MCA territory infarction according to the presence or absence of LSA involvement. MATERIALS AND METHODS: Consecutive patients with first-ever infarction in the unilateral superficial MCA territory were included in this study...
January 2017: Yonsei Medical Journal
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