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https://www.readbyqxmd.com/read/29730271/intraventricular-extension-of-an-aneurysmal-subarachnoid-hemorrhage-is-an-independent-predictor-of-a-worse-functional-outcome
#1
Mario Zanaty, Daichi Nakagawa, Robert M Starke, Enrique C Leira, Edgar A Samaniego, Waldo R Guerrero, James Torner, Yasunori Nagahama, Olatilewa Awe, Jeremy Greenlee, Joseph S Hudson, Lauren Allan, Reem Elwy, Nohra Chalouhi, Pascal Jabbour, Royce Woodroffe, Anthony Piscopo, David Hasan
OBJECTIVE: The objective of this study is to determine the impact of intraventricular hemorrhage (IVH) on the cognitive prognosis of subarachnoid hemorrhage (SAH) due to ruptured cerebral aneurysm, independent of the presence of intraparenchymal hemorrhage, hydrocephalus or vasospasm. PATIENT AND METHODS: A Retrospective review of a prospectively collected database of patients with aneurysmal SAH from July 2009 to November 2016 was performed. Patients were included if they had a saccular aneurysm with a Hunt-Hess grade (HHG) 1-3...
April 30, 2018: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29728648/salivary-kynurenic-acid-response-to-psychological-stress-inverse-relationship-to-cortical-glutamate-in-schizophrenia
#2
Joshua Chiappelli, Laura M Rowland, Francesca M Notarangelo, S Andrea Wijtenburg, Marian A R Thomas, Ana Pocivavsek, Aaron Jones, Krista Wisner, Peter Kochunov, Robert Schwarcz, L Elliot Hong
Frontal glutamatergic synapses are thought to be critical for adaptive, long-term stress responses. Prefrontal cortices, including the anterior cingulate cortex (ACC) contribute to stress perception and regulation, and are involved in top-down regulation of peripheral glucocorticoid and inflammatory responses to stress. Levels of kynurenic acid (KYNA) in saliva increase in response to psychological stress, and this stress-induced effect may be abnormal in people with schizophrenia. Here we test the hypothesis that ACC glutamatergic functioning may contribute to the stress-induced salivary KYNA response in schizophrenia...
April 18, 2018: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29705035/rf-pulse-methods-for-use-with-surface-coils-frequency-modulated-pulses-and-parallel-transmission
#3
Michael Garwood, Kamil Uğurbil
The first use of a surface coil to obtain a 31 P NMR spectrum from an intact rat by Ackerman and colleagues initiated a revolution in magnetic resonance imaging (MRI) and spectroscopy (MRS). Today, we take it for granted that one can detect signals in regions external to an RF coil; at the time, however, this concept was most unusual. In the approximately four decade long period since its introduction, this simple idea gave birth to an increasing number of innovations that has led to transformative changes in the way we collect data in an in vivo magnetic resonance experiment, particularly with MRI of humans...
April 25, 2018: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29690708/-effect-of-transient-ischemic-attack-on-early-neurological-deterioration-in-patients-with-ipsilateral-ischemic-stroke
#4
S S Cao, A L Lin, L Sun, H Liang, Y Cheng, Y W Xu
Objective: To explore the effect of anterior circulation transient ischemic attack (TIA) on early neurological deterioration (END) in patients with ipsilateral ischemic stroke and its mechanism. Methods: (1) One hundred and thirteen patients with ipsilateral ischemic stroke and 36 healthy volunteers (healthy control group) in Neurology Department of Tianjin Medical University General Hospital from November 2014 to July 2015 were recruited into this study. According to whether got TIA before ischemic stroke, patients were divided into simple ischemic stroke group (CI group, n =87) and TIA-CI group ( n =26)...
April 3, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29684257/reliability-of-neurometabolite-detection-with-two-dimensional-localized-correlation-spectroscopy-at-3t
#5
Jameen Arm, Oun Al-Iedani, Scott Quadrelli, Karen Ribbons, Rod Lea, Jeannette Lechner-Scott, Saadallah Ramadan
BACKGROUND: Two-dimensional localized correlational spectroscopy (2D L-COSY) has been applied in vivo to investigate metabolic profiles in many disorders due to its ability to detect several metabolites simultaneously. Successful application of this technique depends on the reliability of the detection and understanding of the variability result from test-retest measurements. PURPOSE: To evaluate the test-retest repeatability/reliability of 2D L-COSY in detecting brain metabolites in a phantom and healthy subjects in a 3T scanner...
April 23, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29667260/tai-chi-improves-brain-metabolism-and-muscle-energetics-in-older-adults
#6
Min Zhou, Huijun Liao, Lasya P Sreepada, Joshua R Ladner, James A Balschi, Alexander P Lin
BACKGROUND AND PURPOSE: Tai Chi is a mind-body exercise that has been shown to improve both mental and physical health. As a result, recent literature suggests the use of Tai Chi to treat both physical and psychological disorders. However, the underlying physiological changes have not been characterized. The aim of this pilot study is to assess the changes in brain metabolites and muscle energetics after Tai Chi training in an aging population using a combined brain-muscle magnetic resonance spectroscopy (MRS) examination...
April 17, 2018: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29666584/differences-in-muscle-metabolism-between-triathletes-and-normally-active-volunteers-investigated-using-multinuclear-magnetic-resonance-spectroscopy-at-7t
#7
Radka Klepochová, Ladislav Valkovič, Thomas Hochwartner, Christoph Triska, Norbert Bachl, Harald Tschan, Siegfried Trattnig, Michael Krebs, Martin Krššák
Purpose: The influence of endurance training on skeletal muscle metabolism can currently be studied only by invasive sampling or through a few related parameters that are investigated by either proton (1 H) or phosphorus (31 P) magnetic resonance spectroscopy (MRS). The aim of this study was to compare the metabolic differences between endurance-trained triathletes and healthy volunteers using multi-parametric data acquired by both, 31 P- and 1 H-MRS, at ultra-high field (7T) in a single experimental protocol...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29651557/higher-admission-fasting-plasma-glucose-levels-are-associated-with-a-poorer-short-term-neurologic-outcome-in-acute-ischemic-stroke-patients-with-good-collateral-circulation
#8
Feng Wang, Beisi Jiang, Lasheta Kanesan, Yuwu Zhao, Bernard Yan
AIMS: In this retrospective study, we sought to delineate the collateral circulation status of acute ischemic stroke patients by CT perfusion and evaluate 90-day modified Rankin Scale (mRS) scores of patients with good or poor collaterals and its correlation with admission fasting plasma glucose (FPG). METHODS: We enrolled acute ischemic stroke patients who presented to our hospital 4.5 h within an onset of the first episode between January 2009 and December 2015...
April 12, 2018: Acta Diabetologica
https://www.readbyqxmd.com/read/29644702/influence-of-group-iii-iv-muscle-afferents-on-small-muscle-mass-exercise-performance-a-bioenergetics-perspective
#9
Ryan M Broxterman, Thomas J Hureau, Gwenael Layec, David E Morgan, Amber D Bledsoe, Jacob E Jessop, Markus Amann, Russell S Richardson
The direct influence of group III/IV muscle afferents on exercise performance remains equivocal. Therefore, all-out intermittent isometric single-leg knee-extensor exercise and phosphorous magnetic resonance spectroscopy (31 P-MRS) were utilized to provide a high time resolution assessment of exercise performance and skeletal muscle bioenergetics in control conditions (CTRL) and with the attenuation of group III/IV muscle afferent feedback via lumbar intrathecal fentanyl (FENT). In both conditions, seven recreationally active men performed 60 maximal voluntary quadriceps contractions (MVC; 3 s contraction, 2 s relaxation), while knee-extensor force and 31 P-MRS were assessed during each MVC...
April 12, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29643061/supplemental-oxygen-improves-in-vivo-mitochondrial-oxidative-phosphorylation-flux-in-sedentary-obese-adults-with-type-2-diabetes
#10
Melanie Cree-Green, Rebecca L Scalzo, Kylie Harrall, Bradley R Newcomer, Irene E Schauer, Amy G Huebschmann, Shawna McMillin, Mark S Brown, David Orlicky, Leslie Knaub, Kristen J Nadeau, P Mason Mcclatchey, Timothy A Bauer, Judith G Regensteiner, Jane E B Reusch
Type 2 diabetes is associated with impaired exercise capacity. Alterations in both muscle perfusion and mitochondrial function can contribute to exercise impairment. We hypothesized that impaired muscle mitochondrial function in type 2 diabetes is mediated, in part, by decreased tissue oxygen delivery and would improve with oxygen supplementation. Ex vivo muscle mitochondrial content and respiration assessed from biopsy samples demonstrated expected differences in obese individuals with (N=18) and without (N=17) diabetes...
April 11, 2018: Diabetes
https://www.readbyqxmd.com/read/29626176/preventive-antibiotics-in-stroke-study-pass-a-cost-effectiveness-study
#11
Willeke F Westendorp, Elles Zock, Jan-Dirk Vermeij, Henk Kerkhoff, Paul J Nederkoorn, Marcel G W Dijkgraaf, Diederik van de Beek
OBJECTIVE: To evaluate the cost-effectiveness of preventive ceftriaxone vs standard stroke unit care without preventive antimicrobial therapy in acute stroke patients. METHODS: In this multicenter, randomized, open-label trial with masked endpoint assessment, 2,550 patients with acute stroke were included between 2010 and 2014. Economic evaluation was performed from a societal perspective with a time horizon of 3 months. Volumes and costs of direct, indirect, medical, and nonmedical care were assessed...
May 1, 2018: Neurology
https://www.readbyqxmd.com/read/29587752/alzheimer-like-brain-metabolic-and-structural-features-in-cholesterol-fed-rabbit-detected-by-magnetic-resonance-imaging
#12
Ping Jin, Yongming Pan, Zhiyong Pan, Jianqin Xu, Min Lin, Zhichao Sun, Minli Chen, Maosheng Xu
BACKGROUND: Hypercholesterolemia is known to increase the risk of AD in later life, the purpose of this study is to illustrate brain metabolic and structural changes in a cholesterol-fed rabbit model of Alzheimer's Disease (AD) by using clinical 3 T Magnetic Resonance Imaging (MRI). METHODS: The Institutional Animal Care and Use Committee of Zhejiang Chinese Medical University approved the study. Totally 16 Japanese White Rabbits (JWR) were randomly divided into 2 groups including normal control group fed with routine diet (group NC) and high cholesterol diet group (group CD) fed a 2% cholesterol diet with 0...
March 27, 2018: Lipids in Health and Disease
https://www.readbyqxmd.com/read/29578260/dynamic-multivoxel-localized-31-p-mrs-during-plantar-flexion-exercise-with-variable-knee-angle
#13
Fabian Niess, Georg B Fiedler, Albrecht I Schmid, Elmar Laistler, Roberta Frass-Kriegl, Michael Wolzt, Ewald Moser, Martin Meyerspeer
Exercise studies investigating the metabolic response of calf muscles using31 P MRS are usually performed with a single knee angle. However, during natural movement, the distribution of workload between the main contributors to force, gastrocnemius and soleus is influenced by the knee angle. Hence, it is of interest to measure the respective metabolic response of these muscles to exercise as a function of knee angle using localized spectroscopy. Time-resolved multivoxel31 P MRS at 7 T was performed simultaneously in gastrocnemius medialis and soleus during rest, plantar flexion exercise and recovery in 12 healthy volunteers...
March 26, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29574600/rates-and-predictors-of-futile-recanalization-in-patients-undergoing-endovascular-treatment-in-a-multicenter-clinical-trial
#14
Haitham M Hussein, Muhammad A Saleem, Adnan I Qureshi
PURPOSE: The phenomenon of futile recanalization, defined as lack of clinical benefit despite angiographic recanalization, is an important limitation of endovascular treatment for acute ischemic stroke. We aim to characterize the occurrence and predictors of futile recanalization in the endovascular arm of the Interventional Management of Stroke (IMS) III trial. METHODS: Patients with near complete or complete recanalization (TICI grades 2b and 3) were divided according to functional outcome at 3 months into "meaningful recanalization," defined as mRS score 0-2, and "futile recanalization," mRS score 3-6...
May 2018: Neuroradiology
https://www.readbyqxmd.com/read/29572626/is-visual-activation-associated-with-changes-in-cerebral-high-energy-phosphate-levels
#15
Bart L van de Bank, Marnix C Maas, Lauren J Bains, Arend Heerschap, Tom W J Scheenen
Phosphorus magnetic resonance spectroscopy (31 P MRS) has been employed before to assess phosphocreatine (PCr) and other high-energy phosphates in the visual cortex during visual stimulation with inconsistent results. We performed functional31 P MRS imaging in the visual cortex and control regions during a visual stimulation paradigm at an unprecedented sensitivity, exploiting a dedicated RF coil design at a 7 T MR system. Visual stimulation in a 3 min 24 s on-off paradigm in eight young healthy adults generated a clear BOLD effect with traditional1 H functional MRI in the visual cortex (average z score 9...
March 23, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29571865/preoperative-biomarkers-in-patients-with-idiopathic-normal-pressure-hydrocephalus-showing-a-favorable-shunt-surgery-outcome
#16
Yun Jeong Hong, Min-Jeong Kim, Eunhye Jeong, Ji-Eun Kim, Jihye Hwang, Jung-Il Lee, Jae-Hong Lee, Duk L Na
INTRODUCTION: Idiopathic normal pressure hydrocephalus (INPH) is known to be a potentially treatable neurologic condition. The neurocognitive outcomes after surgery, however, have been variable. It is important to define preoperative characteristics of patients that predicts the shunting outcome. We aimed to compare baseline differences between shunt-responsive and unresponsive patients after 1year from surgery in order to identify preoperative predictors showing favorable clinical outcomes...
April 15, 2018: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29519285/-use-of-somatosensory-evoked-potentials-for-preoperative-assessment-in-patients-with-severe-aneurysmal-subarachnoid-hemorrhage-before-surgical-or-interventional-treatment-a-prospective-observational-cohort-study
#17
Jingwei Zhao, Xuying Luo, Zheng Zhang, Kai Chen, Guangzhi Shi, Jianxin Zhou
OBJECTIVE: To explore the application value of short latency somatosensory evoked potentials (SLSEP) as a tool for preoperative assessment of surgical or interventional treatment in patients with severe aneurysmal subarachnoid hemorrhage (aSAH). METHODS: A prospective observational cohort study was conducted. The patients with severe aSAH with a WFNS grade of IV or V admitted to intensive care unit (ICU) of Beijing Tiantan Hospital of Capital Medical University from November 2016 to April 2017 were enrolled...
March 2018: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29509433/reduced-skeletal-muscle-phosphocreatine-concentration-in-type-2-diabetic-patients-a-quantitative-image-based-phosphorus-31-mr-spectroscopy-study
#18
Erika M Ripley, Geoffrey D Clarke, Vala Hamidi, Robert A Martinez, Floyd D Settles, Carolina Solis, Shengwen Deng, Muhammad Abdul-Ghani, Devjit Tripathy, Ralph A DeFronzo
Mitochondrial dysfunction has been described in insulin resistant (IR) states including type 2 diabetes mellitus (T2DM). Previous studies using 31 P-MRS in T2DM reported results as relative concentrations of metabolite ratios, which could obscure changes in phosphocreatine [PCr] and [ATP] and attenuate differences between T2DM and NGT individuals. We used a novel image-guided 31 P-MRS method to quantitate phosphorus metabolites in vastus lateralis (VL) muscle in 11 T2DM and 14 NGT subjects. Subjects received OGTT, euglycemic insulin clamp, 31 P-MRS study to measure absolute concentrations (mM) of [PCr], inorganic phosphate [Pi], and [ATP], and VL muscle biopsy to evaluate mitochondrial density...
March 6, 2018: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29499298/exercise-training-impacts-exercise-tolerance-and-bioenergetics-in-gastrocnemius-muscle-of-non-obese-type-2-diabetic-goto-kakizaki-rat-in-vivo
#19
Michael Macia, Emilie Pecchi, Martine Desrois, Carole Lan, Christophe Vilmen, Bernard Portha, Monique Bernard, David Bendahan, Benoît Giannesini
The functional and bioenergetics impact of regular physical activity upon type-2 diabetic skeletal muscle independently of confounding factors of overweight remains undocumented. Here, gastrocnemius muscle energy fluxes, mitochondrial capacity and mechanical performance were assessed noninvasively and longitudinally in non-obese diabetic Goto-Kakizaki rats using magnetic resonance (MR) imaging and dynamic 31-phosphorus MR spectroscopy (31 P-MRS) throughout a 6-min fatiguing bout of exercise performed before, in the middle (4-week) and at the end of an 8-week training protocol consisting in 60-min daily run on a treadmill...
May 2018: Biochimie
https://www.readbyqxmd.com/read/29462731/another-endovascular-therapy-strategy-for-acute-tandem-occlusion-protect-expand-aspiration-revascularization-stent-pears-technique
#20
Ting-Yu Yi, Wen-Huo Chen, Yan-Min Wu, Mei-Fang Zhang, Ding-Lai Lin, Xiao-Hui Lin
OBJECTIVE: Initial stenotic occlusion of the internal carotid artery with intracranial artery occlusion in acute ischemic stroke is associated with high morbidity and can benefit from endovascular therapy. However, the optimal endovascular strategy is unclear. This study aimed to evaluate the feasibility of the "half" anterograde approach and clinical outcome of treated patients. Revascularization validity of the 2 "half" anterograde approach with (Protect-Expand-Aspiration-Revascularization-Stent [PEARS] technique) or without (plain technique) using an embolic prevention device and aspiration was also compared...
May 2018: World Neurosurgery
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