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31 P MRS

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
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 using31 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-guided31 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
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...
February 27, 2018: Biochimie
Ting-Yu Yi, Wen-Huo Chen, Yan-Min Wu, Mei-Fang Zhang, Ding-Lai Lin, Xiao-Hui Lin
PURPOSE: Initial stenotic occlusion of the internal carotid artery (ICA) 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 two "half" anterograde approach with (PEARS technique) or without (plain technique) using an embolic prevention device and aspiration was also compared...
February 17, 2018: World Neurosurgery
Deepika Dhiman, Sanjay K Mahajan, Sudhir Sharma, Rajiv Raina
Background: The people residing in hills of this Sub-Himalayan region traditionally have a distinct lifestyle involving high level of physical activity. However, increased urbanization in the last two decades has led to changes in lifestyle of people. The present study was an endeavor to document changes in the pattern of stroke in people residing at moderate altitude. Aim: This study was aimed to study the evolving trends in clinical profile, risk factors, and outcome at 3 months in hospitalized patients of stroke in a Tertiary Care Hospital situated at moderate altitude...
January 2018: Journal of Neurosciences in Rural Practice
Mark A Davison, Bichun Ouyang, Kavantissa M Keppetipola, Michael Chen
BACKGROUND: Compared with males, females consistently fare worse following mechanical thrombectomy for large vessel ischemic strokes. Understanding why this gender disparity occurs may guide improvements in future treatment strategies. In this study, we aim to determine whether gender differences in cerebral arterial diameter correlate with clinical outcomes following stroke thrombectomy. METHODS: We performed an observational study of consecutive acute ischemic stroke patients undergoing mechanical thrombectomy at a single, urban tertiary care medical center...
February 12, 2018: Journal of Neurointerventional Surgery
Jimin Ren, Ty Shang, A Dean Sherry, Craig R Malloy
PURPOSE: The study was undertaken to demonstrate that there is more than 1 component in the extracellular Pi31 P signal ( Piex) acquired from human head using nonlocalized 31 P MRS. METHODS: Outer-volume-suppression (OVS) saturation and 1D/2D 31 P CSI were utilized to reveal the presence of an additional component in the Piex signal. RESULTS: 67% of the head extracellular Pi signal was attenuated upon OVS saturation of the peripheral meningeal tissues, likely reflecting elimination of the Pi signal in the meningeal fluids (the blood and CSF)...
February 9, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Kevin Moll, Alexander Gussew, Maria Nisser, Steffen Derlien, Martin Krämer, Jürgen R Reichenbach
Measurements of exercise-induced metabolic changes, such as oxygen consumption, carbon dioxide exhalation or lactate concentration, are important indicators for assessing the current performance level of athletes in training science. With exercise-limiting metabolic processes occurring in loaded muscles, 31 P-MRS represents a particularly powerful modality to identify and analyze corresponding training-induced alterations. Against this background, the current study aimed to analyze metabolic adaptations after an exhaustive exercise in two calf muscles (m...
February 2, 2018: NMR in Biomedicine
Chih-Hua Yeh, Gigin Lin, Jiun-Jie Wang, Chien-Yu Lin, Shang-Yueh Tsai, Yu-Chun Lin, Yi-Ming Wu, Sheung-Fat Ko, Hung-Ming Wang, Sheng-Chieh Chan, Tzu-Chen Yen, Chun-Ta Liao, Shu-Hang Ng
Purpose: To determine whether pretreatment in vivo 1H magnetic resonance (MR) spectroscopy at 3 Tesla (T) and 18F-FDG PET/CT can offer predictive power regarding the local control of oropharyngeal or hypopharyngeal squamous cell carcinoma (OHSCC) patients. Materials and Methods: 1H MR spectroscopy was performed in addition to conventional MR imaging before definitive chemoradiotherapy in 58 patients with advanced OHSCC. The relationship of local control with the 1H MR spectroscopy and 18F-FDG PET/CT parameters was analyzed...
December 29, 2017: Oncotarget
Kyu-Ho Song, Min-Young Lee, Chi-Hyeon Yoo, Song-I Lim, Bo-Young Choe
Proton magnetic resonance spectroscopy (MRS) with optimized relaxation time is an effective method to quantify hepatic fatty acid values and characterize steatosis. The aim of this study is to quantify the difference in hepatic lipid content with metabolic changes during the progression of steatosis by using localized MRS sequence with T2 relaxation time determination. Fatty liver disease was induced in C57BL/6N mice through a high-fat diet (HFD) of pellets containing 60% fat, 20% protein, and 20% carbohydrates...
January 11, 2018: Chemistry and Physics of Lipids
Isaac M Adanyeguh, Marie-Lorraine Monin, Daisy Rinaldi, Léorah Freeman, Alexandra Durr, Stéphane Lehéricy, Pierre-Gilles Henry, Fanny Mochel
The striatum is a well-known region affected in Huntington disease (HD). However, other regions, including the visual cortex, are implicated. We have identified previously an abnormal energy response in the visual cortex of patients at an early stage of HD using 31 P magnetic resonance spectroscopy (31 P MRS). We therefore sought to further characterize these metabolic alterations with 1 H MRS using a well-validated semi-localized by adiabatic selective refocusing (semi-LASER) sequence that allows the measurement of an expanded number of neurometabolites...
January 9, 2018: NMR in Biomedicine
Manan Shah, Lee Birnbaum, Jennifer Rasmussen, Padmini Sekar, Charles J Moomaw, Jennifer Osborne, Anastasia Vashkevich, Daniel Woo
PURPOSE: We aimed to identify the effect of hyperosmolar therapy (mannitol and hypertonic saline) on outcomes after intracerebral hemorrhage (ICH) in the Ethnic/Racial Variations of Intracerebral Hemorrhage (ERICH) study. METHODS: Comparison of ICH cases treated with hyperosmolar therapy versus untreated cases was performed using a propensity score based on age, initial Glasgow Coma Scale, location of ICH (lobar, deep, brainstem, and cerebellar), log-transformed initial ICH volume, presence of intraventricular hemorrhage, and surgical interventions...
January 3, 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
Elsadig E A Elmaki, Tao Gong, D Menene Nkonika, Guangbin Wang
PURPOSE: The aim of this study was to compare the gamma-amino butyric acid (GABA) levels in the left basal ganglia (BG) of patients with Parkinson's disease (PD) to those of healthy control (HC) volunteers using proton magnetic resonance spectroscopy (1H MRS). MATERIALS AND METHODS: The GABA+ signal-the composite signal from GABA, macromolecules (MMs), and homocarnosine-was detected. GABA+ levels were examined in 21 PD patients and 15 age- and sex-matched HCs. 3T-1H-MRS using the Mescher-Garwood point-resolved spectroscopy (MEGA-PRESS) sequence was performed in order to detect GABA+ levels in the left BG, and the spectra were processed using the Gannet software...
December 26, 2017: Japanese Journal of Radiology
Huihui Liu, Huaguang Zheng, Yongjun Cao, Yuesong Pan, David Wang, Runhua Zhang, Shoujiang You, Xinmiao Zhang, Shuya Li, Xu Tong, Chun-Feng Liu, Yilong Wang
BACKGROUND: We performed a meta-analysis to compare the efficacy and safety between low- and standard-dose intravenous (IV) tissue-type plasminogen activator (tPA) for acute ischemic stroke (AIS) patients within 4.5 hours of symptom onset. METHODS: We searched PubMed and EMBASE for relevant studies from inception to June1, 2017. Cohort or randomized controlled studies for AIS within 4.5 hours of symptom onset with comparison between low-dose and standard-dose tPA were included...
April 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
Ichiro Deguchi, Norio Tanahashi, Masaki Takao
BACKGROUND: An intravenous recombinant tissue plasminogen activator (rt-PA, alteplase .6 mg/kg) for acute cerebral infarction within 3 hours of onset was approved in Japan in 2005. The treatment window was subsequently extended to within 4.5 hours of onset. However, few Japanese studies have compared the efficacy and safety of rt-PA therapy between patients treated within 3 hours and patients treated within 3-4.5 hours. METHODS: This study included 323 patients who received rt-PA for acute cerebral infarction within 3 hours or 3-4...
April 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
Maggie Lawrence, Francisco T Celestino Junior, Hemilianna Hs Matozinho, Lindsay Govan, Jo Booth, Jane Beecher
BACKGROUND: Stroke is a major health issue and cause of long-term disability and has a major emotional and socioeconomic impact. There is a need to explore options for long-term sustainable interventions that support stroke survivors to engage in meaningful activities to address life challenges after stroke. Rehabilitation focuses on recovery of function and cognition to the maximum level achievable, and may include a wide range of complementary strategies including yoga.Yoga is a mind-body practice that originated in India, and which has become increasingly widespread in the Western world...
December 8, 2017: Cochrane Database of Systematic Reviews
Richa Sharma, Rafael H Llinas, Victor Urrutia, Elisabeth B Marsh
BACKGROUND AND PURPOSE: Recent studies suggest that patients with large-vessel ischemic strokes (large-vessel occlusion [LVO]) with favorable imaging may benefit from mechanical thrombolysis even when treated outside the standard 6-hour window. However, many patients in these studies presented with unknown times of onset. We compare outcomes in thrombectomy patients treated at less than versus greater than 6 hours from last known well (LKN), and evaluate whether "unknown time of onset" alters prognosis...
April 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
Ivan I Kirov, Ruben Kuzniecky, Hoby P Hetherington, Brian J Soher, Matthew S Davitz, James S Babb, Heath R Pardoe, Jullie W Pan, Oded Gonen
OBJECTIVE: To test the hypothesis that localization-related epilepsy is associated with widespread neuronal dysfunction beyond the ictal focus, reflected by a decrease in patients' global concentration of their proton MR spectroscopy (1 H-MRS) observed marker, N-acetyl-aspartate (NAA). METHODS: Thirteen patients with localization-related epilepsy (7 men, 6 women) 40±13 (mean±standard-deviation)years old, 8.3±13.4years of disease duration; and 14 matched controls, were scanned at 3 T with MRI and whole-brain (WB)1 H MRS...
January 2018: Epilepsy Research
Daniel C Javitt, Cameron S Carter, John H Krystal, Joshua T Kantrowitz, Ragy R Girgis, Lawrence S Kegeles, John D Ragland, Richard J Maddock, Tyler A Lesh, Costin Tanase, Philip R Corlett, Douglas L Rothman, Graeme Mason, Maolin Qiu, James Robinson, William Z Potter, Marlene Carlson, Melanie M Wall, Tse-Hwei Choo, Jack Grinband, Jeffrey A Lieberman
Importance: Despite strong theoretical rationale and preclinical evidence, several glutamate-targeted treatments for schizophrenia have failed in recent pivotal trials, prompting questions as to target validity, compound inadequacy, or lack of target engagement. A key limitation for glutamate-based treatment development is the lack of functional target-engagement biomarkers for translation between preclinical and early-stage clinical studies. We evaluated the utility of 3 potential biomarkers-ketamine-evoked changes in the functional magnetic imaging (fMRI) blood oxygen level-dependent response (pharmacoBOLD), glutamate proton magnetic resonance spectroscopy (1H MRS), and task-based fMRI-for detecting ketamine-related alterations in brain glutamate...
January 1, 2018: JAMA Psychiatry
Ramanan Ganeshan, Alexander H Nave, Jan F Scheitz, Katharina A Schindlbeck, Karl Georg Haeusler, Christian H Nolte, Kersten Villringer, Jochen B Fiebach
OBJECTIVES: Post-contrast magnetic resonance angiography (PC-MRA) enables visualization of vessel segments distal to an intra-arterial thrombus in acute ischemic stroke. We hypothesized that PC-MRA also allows clot length measurement in different intracranial vessels. METHODS: Patients with MRI-confirmed ischemic stroke and intracranial artery occlusion within 24 hours of symptom onset were prospectively evaluated. PC-MRA was added to a standard stroke MRI protocol...
November 18, 2017: Journal of Neurointerventional Surgery
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