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https://www.readbyqxmd.com/read/29926756/test-retest-reliability-of-perfusion-of-the-precentral-cortex-and-precentral-subcortical-white-matter-on-three-dimensional-pseudo-continuous-arterial-spin-labeling
#1
Mengqi Liu, Zhiye Chen, Lin Ma
Objective This study was performed to evaluate the test-retest reliability of perfusion of the cortex and subcortical white matter on three-dimensional spiral fast spin echo pseudo-continuous arterial spin labeling (3D-ASL). Methods Eight healthy subjects underwent 3D-ASL and structural imaging at the same time each day for 1 week. ASL data acquisition was performed in the resting state and right finger-tapping state. Cerebral blood flow (CBF) images were calculated, and the CBF values of the precentral cortex (PCC) and precentral subcortical white matter (PCSWM) were automatically extracted based on the structural images and CBF images...
January 1, 2018: Journal of International Medical Research
https://www.readbyqxmd.com/read/29925149/-combined-application-of-multi-parameter-semiquantitative-alberta-stroke-program-early-ct-score-to-assess-infarction-severity-in-acute-ischemic-stroke
#2
Z W Liu, Y Jiang, R Wang, J Lu, P Qi, R Y Cao, L Zhang, Z Y Shen, J Chen
Objective: To explore the significance of multi-parameter semiquantitative Alberta Stroke Program Early CT Score (ASPECTS) in detecting core infarction in acute ischemic stroke (AIS) patients. Methods: Twenty-one consecutive AIS patients from Beijing Hospital were retrospectively reviewed in this study from August 2016 to August 2017. All the patients presented within 6 hours since symptom onset.All the patients underwent one-stop dynamic whole brain 4D CTA-CTP scan before treatments (intravenous thrombolysis, mechanical thrombectomy, or other endovascular recanalization)...
June 5, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29917239/sodium-nitroprusside-dilates-cerebral-vessels-and-enhances-internal-carotid-artery-flow-in-young-men
#3
Niels D Olesen, Mads Fischer, Niels H Secher
KEY POINTS: Sodium nitroprusside lowers blood pressure by vasodilation but is reported to reduce cerebral blood flow. In healthy young men sodium nitroprusside reduced blood pressure, total peripheral resistance, and arterial CO2 tension and yet cerebral blood flow was maintained with an increase in internal carotid artery blood flow and cerebrovascular conductance. Sodium nitroprusside induces both systemic and cerebral vasodilation affecting internal carotid artery more than vertebral artery flow...
June 19, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29916058/effects-of-systematic-partial-volume-errors-on-the-estimation-of-gray-matter-cerebral-blood-flow-with-arterial-spin-labeling-mri
#4
Jan Petr, Henri J M M Mutsaerts, Enrico De Vita, Rebecca M E Steketee, Marion Smits, Aart J Nederveen, Frank Hofheinz, Jörg van den Hoff, Iris Asllani
OBJECTIVE: Partial volume (PV) correction is an important step in arterial spin labeling (ASL) MRI that is used to separate perfusion from structural effects when computing the mean gray matter (GM) perfusion. There are three main methods for performing this correction: (1) GM-threshold, which includes only voxels with GM volume above a preset threshold; (2) GM-weighted, which uses voxel-wise GM contribution combined with thresholding; and (3) PVC, which applies a spatial linear regression algorithm to estimate the flow contribution of each tissue at a given voxel...
June 18, 2018: Magma
https://www.readbyqxmd.com/read/29915015/higher-aortic-stiffness-is-associated-with-lower-global-cerebrovascular-reserve-among-older-humans
#5
Lyndsey E DuBose, Laura L Boles Ponto, David J Moser, Emily Harlynn, Leah Reierson, Gary L Pierce
Greater aortic stiffness and pulse pressure are associated with cerebrovascular remodeling, reduced white matter microstructure, and cognitive performance with aging in humans. However, it is unclear whether aortic stiffness and pulse pressure are associated with reduced basal global cerebral blood flow (CBF) and cerebrovascular reserve among older adults. Global CBF was quantified in 205 adults (range, 19-87 years; mean±SE: 30.6±1.3 years) using quantitative [15 O]water brain positron emission tomography imaging...
June 18, 2018: Hypertension
https://www.readbyqxmd.com/read/29913971/brain-activation-due-to-postoperative-pain-from-the-right-hand-measured-with-regional-cerebral-blood-flow-using-positron-emission-tomography
#6
Torsten Gordh, Bertil Vinnars, Håkan Fischer, Hans Blomberg, Jan Modig, Mats Fredrikson, Per Hartvig
Background Brain activation resulting from acute postoperative pain has to our knowledge not previously been studied using positron emission tomography, except from one case study. The aim of this study was to monitor activation in brain sensory pathways during acute pain after surgery of the hand. A secondary aim was to compare brain activation in clinical postoperative pain to that previously reported, by the same research group, for a model of experimental pain from the same body area. Increase in regional cerebral blood flow (rCBF) is presumed to indicate neuronal activation and decrease in blood flow decreased neuronal firing...
December 29, 2017: Scandinavian Journal of Pain
https://www.readbyqxmd.com/read/29912979/evidence-of-cyclical-light-dark-regulated-expression-of-freezing-tolerance-in-young-winter-wheat-plants
#7
Daniel Z Skinner, Brian Bellinger, William Hiscox, Gregory L Helms
The ability of winter wheat (Triticum aestivum L.) plants to develop freezing tolerance through cold acclimation is a complex rait that responds to many environmental cues including day length and temperature. A large part of the freezing tolerance is conditioned by the C-repeat binding factor (CBF) gene regulon. We investigated whether the level of freezing tolerance of 12 winter wheat lines varied throughout the day and night in plants grown under a constant low temperature and a 12-hour photoperiod. Freezing tolerance was significantly greater (P<0...
2018: PloS One
https://www.readbyqxmd.com/read/29912298/cocaine-decreases-spontaneous-neuronal-activity-and-increases-low-frequency-neuronal-and-hemodynamic-cortical-oscillations
#8
Wei Chen, Nora D Volkow, James Li, Yingtian Pan, Congwu Du
Low-frequency oscillations (LFOs) in hemodynamics assessed by fMRI reflect synchronized neuronal activities and are the basis for mapping brain function and its disruption by drugs and disease. Here we assess if cocaine disrupts coupling between neuronal and vascular LFOs by simultaneously measuring cortical field potentials (FP) and cerebral blood flow (CBF) regarding their LFOs (0-1 Hz) spectral bandwidths in the somatosensory cortex of naïve and chronic cocaine-exposed rats at baseline and during cocaine intoxication...
April 18, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29910744/yangxue-qingnao-wan-and-silibinin-capsules-the-two-chinese-medicines-attenuate-cognitive-impairment-in-aged-ldlr-golden-syrian-hamsters-involving-protection-of-blood-brain-barrier
#9
You-Yu Gu, Ping Huang, Quan Li, Yu-Ying Liu, George Liu, Yu-Hui Wang, Ming Yi, Li Yan, Xiao-Hong Wei, Lei Yang, Bai-He Hu, Xin-Rong Zhao, Xin Chang, Kai Sun, Chun-Shui Pan, Yuan-Chen Cui, Qing-Fang Chen, Chuan-She Wang, Jing-Yu Fan, Zhi-Zhong Ma, Jing-Yan Han
The purpose of the study was to explore the effect and the underlying mechanism of YangXue QingNao Wan (YXQNW) and Silibinin Capsules (SC), the two Chinese medicines, on cognitive impairment in older people with familial hyperlipidaemia. Fourteen month-old female LDLR (+/-) golden Syrian hamsters were used with their wild type as control. YXQNW (0.5 g/kg/day), SC (0.1 g/kg/day), or YXQNW (0.5 g/kg/day) + SC (0.1 g/kg/day) were administrated orally for 30 days. To assess the effects of the two drugs on plasma lipid content and cognitive ability, plasma TC, TG, LDL-C, and HDL-C were measured, and Y maze task was carried out both before and after administration...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29908993/priors-guided-slice-wise-adaptive-outlier-cleaning-for-arterial-spin-labeling-perfusion-mri
#10
Yiran Li, Sudipto Dolui, Dan-Feng Xie, Ze Wang
BACKGROUND: Due to the low signal-to-noise-ratio (SNR) and unavoidable head motions, the pairwise subtraction perfusion signal extraction process in arterial spin labeling (ASL) perfusion MRI can produce extreme outliers. COMPARISON WITH EXISTING METHODS: We previously proposed an adaptive outlier cleaning (AOC) algorithm for ASL MRI. While it performed well even for clinical ASL data, two issues still exist. One is that if the reference is already dominated by noise, outlier cleaning using low correlation with the mean as a rejection criterion will actually reject the less noisy samples but keep the more noisy ones...
June 14, 2018: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29907849/does-prolonged-severe-hypercapnia-interfere-with-normal-cerebrovascular-function-in-piglets
#11
Massroor Pourcyrous, Sandeep Chilakala, Mohamad T Elabiad, Helena Parfenova, Charles W Leffler
BACKGROUND: Hypercapnia causes cerebral vasodilation and increased cerebral blood flow (CBF). During prolonged hypercapnia it is unknown whether cerebral vasodilation persists and whether cerebrovascular function is preserved. We investigated the effects of prolonged severe hypercapnia on pial arteriolar diameters (PAD) and cerebrovascular reactivity to vasodilators and vasoconstrictors. METHODS: Piglets were anesthetized, intubated and ventilated. Closed cranial windows were implanted to measure PAD...
May 28, 2018: Pediatric Research
https://www.readbyqxmd.com/read/29907848/cerebral-blood-flow-and-serum-neuron-specific-enolase-in-early-onset-neonatal-sepsis
#12
Mohammed S El Shimy, Nehal M El-Raggal, Rania A El-Farrash, Hebatallah A Shaaban, Hanan E Mohamed, Noha M Barakat, Ahmed S Farag, Abeer K El Zohiery, Menat Allah A Shaaban, Dina H Salama
BACKGROUND AND OBJECTIVES: Sepsis leads to systemic inflammatory response with cerebral blood flow (CBF) alteration and blood-brain barrier disruption that contribute to sepsis-associated encephalopathy (SAE). We aimed to evaluate cord blood neuron-specific enolase (cNSE) and CBF in early-onset neonatal sepsis (EONS) as predictors of SAE and to define short-term neurodevelopmental outcomes among survivors. METHODS: cNSE was measured in 200 neonates with antenatal risk factors for EONS, stratified into two groups: sepsis (n = 96) and no-sepsis (n = 104)...
May 26, 2018: Pediatric Research
https://www.readbyqxmd.com/read/29907219/effects-of-a%C3%A3-a%C3%A3-and-cilostazol-on-skin-microcirculation-and-viability-of-tram-flaps-in-hamsters
#13
Denise S Coelho da Mota, Fernando L Sicuro, Angela C Resende, Roberto S De Moura, Daniel A Bottino, Eliete Bouskela
BACKGROUND: Tissue necrosis caused by insufficient perfusion is a major complication in flap transfer. This study evaluated whether treatment with cilostazol or hydroalcoholic extract of seeds of Euterpe oleracea Mart. (açaí) protects the transverse rectus abdominis myocutaneous (TRAM) flap against ischemic damage in hamsters. MATERIALS AND METHODS: Fifty-four hamsters were divided into three oral treatment groups: placebo, açaí, or cilostazol. Caudally based, unipedicled TRAM flaps were raised, sutured back, classified into four vascular zones (I-IV), and evaluated for tissue viability, capillary blood flow (CBF), perfused vessel density (PVD), and microvascular flow index (MFI) by orthogonal polarization spectral imaging at three time points: immediately postoperatively (IPO), 24 h postoperatively (24hPO), and 7 d postoperatively (7POD)...
August 2018: Journal of Surgical Research
https://www.readbyqxmd.com/read/29900559/transcriptome-profiling-of-yellow-leafy-head-development-during-the-heading-stage-in-chinese-cabbage-brassica-rapa-subsp-pekinensis
#14
Yuefei Li, Yong Fan, Yang Jiao, Jie Wu, Zhen Zhang, Xiaolei Yu, Ying Ma
The yellow leafy head of Brassica rapa is known to be tasty and nutritional. Therefore, the heading stage of leaf development is critical to realize high yield and economic benefits. A widely planted commercial cultivar of Brassica rapa ("Qiubao", deep yellow leafy head) was used to conduct transcriptome analysis. The results showed that the yellowing of the inner leaf was likely induced by the predominant β-carotene biosynthesis pathway due to the upregulated gene GGPP and PSY, and the downregulated gene CrtL-e, NCED4 and DWARF-27...
June 14, 2018: Physiologia Plantarum
https://www.readbyqxmd.com/read/29899729/inverse-perfusion-requirements-of-supra-and-infratentorial-brain-metastases-formation
#15
Tanja Schneider, André Kemmling, Julian Schroeder, Klaus Pantel, Markus Glatzel, Gerhard Schoen, Malte Mohme, Jens Fiehler, Susanne Gellißen
Background and Aims: Vascular border zones and the gray-white matter junction are preferred sites for the development of brain metastases (BM), whereas microvascular lesions are known to be a protective factor. In this proof of concept study, we aim to study the relationship of blood perfusion and the spatial distribution of BM. Materials and Methods: An average CT perfusion atlas of 107 healthy patients was created. Voxel-wise reference perfusion values were extracted from BM-negative and BM-positive regions in a second cohort of 100 untreated patients harboring 809 BM confirmed by MRI...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29897547/dietary-supplemented-effects-of-mannan-oligosaccharides-on-biochemical-parameters-of-4-close-bred-flocks-of-japanese-quail-breeders
#16
M A Iqbal, N Roohi, O Khan
The current study was carried out to investigate the consequences of mannan-oligosaccharides (MOS), a prebiotic, as feed supplement on biochemical parameters of Japanese quail breeders (Coturnix coturnix japonica). Twelve-week-old, 960 birds, belonging to 4 close-bred flocks (CBF), were randomly selected and divided into 4 treatment groups with 3 replicates according to pattern (4 strains × 4 treatment groups × 3 replicates). Birds were fed corn-based basal diet or the same diet supplemented with 0.25, 0...
June 8, 2018: Poultry Science
https://www.readbyqxmd.com/read/29895572/pulseless-electrical-activity-a-misdiagnosed-entity-during-asphyxia-in-newborn-infants
#17
Sparsh Patel, Po-Yin Cheung, Anne Lee Solevåg, Keith J Barrington, C Omar Farouk Kamlin, Peter G Davis, Georg M Schmölzer
BACKGROUND: The 2015 neonatal resuscitation guidelines added ECG as a recommended method of assessment of an infant's heart rate (HR) when determining the need for resuscitation at birth. However, a recent case report raised concerns about this technique in the delivery room. OBJECTIVES: To compare accuracy of ECG with auscultation to assess asystole in asphyxiated piglets. METHODS: Neonatal piglets had the right common carotid artery exposed and enclosed with a real-time ultrasonic flow probe and HR was continuously measured and recorded using ECG...
June 12, 2018: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/29893643/regional-cerebral-blood-flow-in-children-and-young-adults-with-chronic-kidney-disease
#18
Hua-Shan Liu, Erum A Hartung, Abbas F Jawad, Jeffrey B Ware, Nina Laney, Allison M Port, Ruben C Gur, Stephen R Hooper, Jerilynn Radcliffe, Susan L Furth, John A Detre
Purpose To investigate the pathophysiologic effects of chronic kidney disease (CKD) on brain function in children with CKD by correlating cerebral blood flow (CBF) with clinical and behavioral indexes. Materials and Methods In this prospective study, 73 pediatric patients with CKD (mean age, 15.80 years ± 3.63; range, 9-25 years) and 57 control subjects (mean age, 15.65 years ± 3.76; range, 9-25 years) were recruited. CBF measurements were acquired with an MRI arterial spin labeling scheme. Neurocognitive measurements were performed with traditional and computerized neurocognitive batteries...
June 12, 2018: Radiology
https://www.readbyqxmd.com/read/29892237/altered-regional-cerebral-blood-flow-of-right-cerebellum-posterior-lobe-in-asthmatic-patients-with-or-without-depressive-symptoms
#19
Yuqun Zhang, Yuan Yang, Ze Wang, Rongrong Bian, Wenhao Jiang, Yingying Yin, Yingying Yue, Zhenghua Hou, Yonggui Yuan
Background: Asthma is a chronic disease appeared to be associated with depression. But the underpinnings of depression in asthma remain unknown. In order to understand the neural mechanisms of depression in asthma, we used cerebral blood flow (CBF) to probe the difference between depressed asthmatic (DA) and non-depressed asthmatic (NDA) patients. Methods: Eighteen DA patients, 24 NDA patients and 57 healthy controls (HC) received pulsed arterial spin labeling (pASL) scan for measuring CBF, resting-state functional magnetic resonance imaging (rs-fMRI) scan, severity of depression and asthma control assessment, respectively...
2018: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/29890916/arterial-spin-labeling-perfusion-prospective-mr-imaging-in-differentiating-neoplastic-from-non-neoplastic-intra-axial-brain-lesions
#20
Neetu Soni, Karthika Srindharan, Sunil Kumar, Prabhakar Mishra, Girish Bathla, Jyantee Kalita, Sanjay Behari
Purpose The purpose of this article is to assess the diagnostic performance of arterial spin-labeling (ASL) magnetic resonance perfusion imaging to differentiate neoplastic from non-neoplastic brain lesions. Material and methods This prospective study included 60 consecutive, newly diagnosed, untreated patients with intra-axial lesions with perilesional edema (PE) who underwent clinical magnetic resonance imaging including ASL sequences at 3T. Region of interest analysis was performed to obtain mean cerebral blood flow (CBF) values from lesion (L), PE and normal contralateral white matter (CWM)...
January 1, 2018: Neuroradiology Journal
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