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https://www.readbyqxmd.com/read/28080974/how-the-heart-speaks-to-the-brain-neural-activity-during-cardiorespiratory-interoceptive-stimulation
#1
Mahlega S Hassanpour, Lirong Yan, Danny J J Wang, Rachel C Lapidus, Armen C Arevian, W Kyle Simmons, Jamie D Feusner, Sahib S Khalsa
Prominent theories emphasize key roles for the insular cortex in the central representation of interoceptive sensations, but how this brain region responds dynamically to changes in interoceptive state remains incompletely understood. Here, we systematically modulated cardiorespiratory sensations in humans using bolus infusions of isoproterenol, a rapidly acting peripheral beta-adrenergic agonist similar to adrenaline. To identify central neural processes underlying these parametrically modulated interoceptive states, we used pharmacological functional magnetic resonance imaging (phMRI) to simultaneously measure blood-oxygenation-level dependent (BOLD) and arterial spin labelling (ASL) signals in healthy participants...
November 19, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28073908/the-neuroendocrine-sequelae-of-paediatric-craniopharyngioma-a-40-year-meta-data-analysis-of-185-cases-from-three-uk-centres
#2
Timothy Shao Ern Tan, Leena Patel, Jaya Sujatha Gopal-Kothandapani, Sarah Ehtisham, Esieza Clare Ikazoboh, Richard Hayward, Kristian Aquilina, Mars Skae, Nicky Thorp, Barry Pizer, Mohammed Didi, Conor Mallucci, Joanne C Blair, Mark N Gaze, Ian Kamaly-Asl, Helen Spoudeas, Peter E Clayton
Objectives The management of paediatric craniopharyngiomas was traditionally complete resection (CR), with better reported tumour control compared to partial resection (PR) or limited surgery (LS). The subsequent shift towards hypothalamic-sparing, conservative surgery with adjuvant radiotherapy (RT) to any residual tumour, aimed at reducing neuroendocrine morbidity, has not been systematically studied. Hence, we reviewed the sequelae of differing management strategies in paediatric craniopharyngioma across three UK tertiary centres over four decades...
January 10, 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28063720/a-case-of-cardiac-arrest-that-occurred-on-a-high-mountain-in-which-a-favorable-outcome-was-obtained
#3
Youichi Yanagawa, Kazuhiko Omori, Ikuto Takeuchi, Kei Jitsuiki, Toshihiko Yoshizawa, Kouhei Ishikawa, Yumi Kando, Mutsumu Fukata, Hiromichi Ohsaka
A 36-year-old man started to climb Mount Fuji (3776m above sea level: ASL), from the Gotemba new fifth station (2400m ASL). He had no significant medical history, and this was his first attempt to climb such a high mountain. He began feeling chest discomfort but continued to climb. When he reached the ninth station of the mountain (3600mASL), he lost consciousness. One individual immediately provided basic life support using an automated external defibrillator (AED) that was located in the station. After electroshocks, he regained consciousness...
October 24, 2016: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28063376/a-comprehensive-non-invasive-framework-for-diagnosing-prostate-cancer
#4
Islam Reda, Ahmed Shalaby, Mohammed Elmogy, Ahmed Abou Elfotouh, Fahmi Khalifa, Mohamed Abou El-Ghar, Ehsan Hosseini-Asl, Georgy Gimel'farb, Naoufel Werghi, Ayman El-Baz
Early detection of prostate cancer increases chances of patients' survival. Our automated non-invasive system for computer-aided diagnosis (CAD) of prostate cancer segments the prostate on diffusion-weighted magnetic resonance images (DW-MRI) acquired at different b-values, estimates its apparent diffusion coefficients (ADC), and classifies their descriptors - empirical cumulative distribution functions (CDF) - with a trained deep learning network. To segment the prostate, an evolving geometric (level-set-based) deformable model is guided by a speed function depending on intensity attributes extracted from the DW-MRI with nonnegative matrix factorization (NMF)...
December 23, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28062492/poliovirus-receptor-related-2-a-cholesterol-responsive-gene-affecting-atherosclerosis-development-by-modulating-leukocyte-migration
#5
Aránzazu Rossignoli, Ming-Mei Shang, Hanna Gladh, Christine Moessinger, Hassan Foroughi Asl, Husain Ahammad Talukdar, Oscar Franzén, Steffen Mueller, Johan L M Björkegren, Erika Folestad, Josefin Skogsberg
OBJECTIVE: Recently, poliovirus receptor-related 2 (Pvrl2) emerged as a top gene in a global gene expression study aiming to detect plasma cholesterol-responsive genes causally related to atherosclerosis regression in hypercholesterolemic mice. PVRL2 is an adherens junction protein implied to play a role in transendothelial migration of leukocytes, a key feature in atherosclerosis development. In this study, we investigated the effect of Pvrl2 deficiency on atherosclerosis development and transendothelial migration of leukocytes activity...
January 5, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28060951/hiv-infects-bronchial-epithelium-and-suppresses-components-of-the-mucociliary-clearance-apparatus
#6
S Chinnapaiyan, T Parira, R Dutta, M Agudelo, A Morris, M Nair, H J Unwalla
Recurrent lung infections and pneumonia are emerging as significant comorbidities in the HIV-infected population in the era of combination antiretroviral therapy (cART). HIV infection has been reported to suppress nasal mucociliary clearance (MCC). Since the primary components driving nasal MCC and bronchial MCC are identical, it is possible that bronchial MCC is affected as well. Effective MCC requires optimal ciliary beating which depends on the maintenance of the airway surface liquid (ASL), a function of cystic fibrosis transmembrane conductance regulator (CFTR) activity and the integrity of the signaling mechanism that regulates ciliary beating and fluid secretion...
2017: PloS One
https://www.readbyqxmd.com/read/28058975/the-spatial-coefficient-of-variation-in-arterial-spin-labeling-cerebral-blood-flow-images
#7
Henri Jmm Mutsaerts, Jan Petr, Lena Václavů, Jan W van Dalen, Andrew D Robertson, Matthan W Caan, Mario Masellis, Aart J Nederveen, Edo Richard, Bradley J MacIntosh
Macro-vascular artifacts are a common arterial spin labeling (ASL) finding in populations with prolonged arterial transit time (ATT) and result in vascular regions with spuriously increased cerebral blood flow (CBF) and tissue regions with spuriously decreased CBF. This study investigates whether there is an association between the spatial signal distribution of a single post-label delay ASL CBF image and ATT. In 186 elderly with hypertension (46% male, 77.4 ± 2.5 years), we evaluated associations between the spatial coefficient of variation (CoV) of a CBF image and ATT...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28048262/su-g-iep1-07-inaccuracy-of-lesion-blood-flow-quantification-related-to-the-proton-density-reference-image-in-arterial-spin-labeling-mri-of-brain-tumors
#8
M Jen, J Johnson, P Hou, H Liu
PURPOSE: Cerebral blood flow quantification in arterial spin labeling (ASL) MRI requires an estimate of the equilibrium magnetization of blood, which is often obtained by a set of proton density (PD) reference image. Normally, a constant blood-brain partition coefficient is assumed across the brain. However, this assumption may not be valid for brain lesions. This study aimed to evaluate the impact of lesion-related PD variations on ASL quantification in patients with brain tumors. METHODS: MR images for posttreatment evaluation of 42 patients with brain tumors were retrospectively analyzed...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047531/su-g-iep1-15-towards-accurate-cerebral-blood-flow-quantification-with-distortion-corrected-pseudo-continuous-arterial-spin-labeling
#9
M Hoff, S Rane-Levandovsky, J Andre
PURPOSE: Traditional arterial spin labeling (ASL) acquisitions with echo planar imaging (EPI) readouts suffer from image distortion due to susceptibility effects, compromising ASL's ability to accurately quantify cerebral blood flow (CBF) and assess disease-specific patterns associated with CBF abnormalities. Phase labeling for additional coordinate encoding (PLACE) can remove image distortion; our goal is to apply PLACE to improve the quantitative accuracy of ASL CBF in humans. METHODS: Four subjects were imaged on a 3T Philips Ingenia scanner using a 16-channel receive coil with a 21/21/10cm (frequency/phase/slice direction) field-of-view...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046980/we-fg-206-05-new-arterial-spin-labeling-method-for-simultaneous-estimation-of-arterial-cerebral-blood-volume-cerebral-blood-flow-and-arterial-transit-time
#10
M Johnston, H Liu, C Whitlow, Y Jung
PURPOSE: To demonstrate the feasibility of a novel Arterial Spin Labeling (ASL) method for simultaneously measuring cerebral blood flow (CBF), arterial transit time (ATT), and arterial cerebral blood volume (aCBV) without the use of a contrast agent. METHODS: A series of multi-TI ASL images were acquired from one healthy subject on a 3T Siemens Skyra, with the following parameters: PCASL labeling with variable TI [300, 400, 500, 600, 700, 800, 900, 1000, 1500, 2000, 2500, 3000, 3500, 4000] ms, labeling bolus 1400 ms when TI allows, otherwise 100 ms less than TI, TR was minimized for each TI, two sinc shaped pre-saturation pulses were applied in the imaging plane immediately before 2D EPI acquisition...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046971/th-cd-206-01-expectation-maximization-algorithm-based-tissue-mixture-quantification-for-perfusion-mri
#11
H Han, Z Liang, L Li, L Xing
PURPOSE: To investigate the feasibility of estimating the tissue mixture perfusions and quantifying cerebral blood flow change in arterial spin labeled (ASL) perfusion MR images. METHODS: The proposed perfusion MR image analysis framework consists of 5 steps: (1) Inhomogeneity correction was performed on the T1- and T2-weighted images, which are available for each studied perfusion MR dataset. (2) We used the publicly available FSL toolbox to strip off the non-brain structures from the T1- and T2-weighted MR images...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046770/su-g-iep1-12-size-selective-arterial-cerebral-blood-volume-mapping-using-multiple-inversion-time-arterial-spin-labeling
#12
Y Jung, M Johnston, H Liu, C Whitlow
PURPOSE: To demonstrate the feasibility of a novel method for size specific arterial cerebral blood volume (aCBV) mapping using pseudo-continuous arterial spin labeling (PCASL), with multiple TI. METHODS: Multiple PCASL images were obtained from a subject with TI of [300, 400, 500, 600, 700, 800, 900, 1000, 1500, 2000, 2500, 3000, 3500, 4000] ms. Each TI pair was averaged six times. Two scans were performed: one without a flow crusher gradient and the other with a crusher gradient (10cm/s in three directions) to remove signals from large arteries...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045109/dendritic-and-axonal-propagation-delays-determine-emergent-structures-of-neuronal-networks-with-plastic-synapses
#13
Mojtaba Madadi Asl, Alireza Valizadeh, Peter A Tass
Spike-timing-dependent plasticity (STDP) modifies synaptic strengths based on the relative timing of pre- and postsynaptic spikes. The temporal order of spikes turned out to be crucial. We here take into account how propagation delays, composed of dendritic and axonal delay times, may affect the temporal order of spikes. In a minimal setting, characterized by neglecting dendritic and axonal propagation delays, STDP eliminates bidirectional connections between two coupled neurons and turns them into unidirectional connections...
January 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28045051/randomized-trial-on-the-effects-of-a-combined-physical-cognitive-training-in-aged-mci-subjects-the-train-the-brain-study
#14
(no author information available yet)
Age-related cognitive impairment and dementia are an increasing societal burden. Epidemiological studies indicate that lifestyle factors, e.g. physical, cognitive and social activities, correlate with reduced dementia risk; moreover, positive effects on cognition of physical/cognitive training have been found in cognitively unimpaired elders. Less is known about effectiveness and action mechanisms of physical/cognitive training in elders already suffering from Mild Cognitive Impairment (MCI), a population at high risk for dementia...
January 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28043066/thalamic-hypoperfusion-and-disrupted-cerebral-blood-flow-networks-in-idiopathic-generalized-epilepsy-arterial-spin-labeling-and-graph-theoretical-analysis
#15
Daichi Sone, Masako Watanabe, Miho Ota, Yukio Kimura, Atsuhiko Sugiyama, Tomoko Maekawa, Mariko Okura, Mikako Enokizono, Etsuko Imabayashi, Noriko Sato, Hiroshi Matsuda
PURPOSE: The aim of this study was to investigate interictal cerebral blood flow (CBF) distributions and graph theoretical networks in idiopathic generalized epilepsy (IGE) using arterial spin labeling (ASL) imaging and anatomical covariance methods of graph theoretical analysis. MATERIAL AND METHODS: We recruited 19 patients with IGE and 19 age-/gender-matched healthy controls. Their CBF images were obtained by pseudo-continuous ASL imaging and compared using statistical parametric mapping 8 software (SPM8) and Graph Analysis Toolbox (GAT)...
December 14, 2016: Epilepsy Research
https://www.readbyqxmd.com/read/28041979/a-three-dimensional-single-scan-approach-for-the-measurement-of-changes-in-cerebral-blood-volume-blood-flow-and-blood-oxygenation-weighted-signals-during-functional-stimulation
#16
Ying Cheng, Qin Qin, Peter C M van Zijl, James J Pekar, Jun Hua
The blood-oxygenation-level-dependent (BOLD) effect reflects ensemble changes in several physiological parameters such as cerebral blood volume (CBV), blood flow (CBF), and cerebral metabolic rate of oxygen (CMRO2). Quantitative BOLD approaches have been developed to estimate CMRO2 dynamics from BOLD, CBF and CBV responses, generally using separate scans. The ability to detect changes in these parameters in a single scan would shorten the total scan time and reduce temporal variations in physiology or neuronal responses...
December 29, 2016: NeuroImage
https://www.readbyqxmd.com/read/28035420/argininosuccinate-lyase-interacts-with-cyclin-a2-in-cytoplasm-and-modulates-growth-of-liver-tumor-cells
#17
Yu-Hsuan Hung, Hau-Lun Huang, Wei-Ching Chen, Meng-Chi Yen, Chien-Yu Cho, Tzu-Yang Weng, Chih-Yang Wang, Yi-Ling Chen, Li-Tzong Chen, Ming-Derg Lai
Arginine is a critical amino acid in specific cancer types including hepatocellular carcinoma (HCC) and melanoma. Novel molecular mechanisms and therapeutic targets in arginine metabolism-mediated cancer formation await further identification. Our laboratory has previously demonstrated that arginine metabolic enzyme argininosuccinate lyase (ASL) promoted HCC formation in part via maintenance of cyclin A2 protein expression and arginine production for channeling to nitric oxide synthase. In this study, we investigated the mechanism by which ASL regulates cyclin A2 expression...
December 23, 2016: Oncology Reports
https://www.readbyqxmd.com/read/28031993/support-vector-machine-classification-of-arterial-volume-weighted-arterial-spin-tagging-images
#18
Yash S Shah, Luis Hernandez-Garcia, Hesamoddin Jahanian, Scott J Peltier
INTRODUCTION: In recent years, machine-learning techniques have gained growing popularity in medical image analysis. Temporal brain-state classification is one of the major applications of machine-learning techniques in functional magnetic resonance imaging (fMRI) brain data. This article explores the use of support vector machine (SVM) classification technique with motor-visual activation paradigm to perform brain-state classification into activation and rest with an emphasis on different acquisition techniques...
December 2016: Brain and Behavior
https://www.readbyqxmd.com/read/28019021/multiparametric-estimation-of-brain-hemodynamics-with-mr-fingerprinting-asl
#19
Pan Su, Deng Mao, Peiying Liu, Yang Li, Marco C Pinho, Babu G Welch, Hanzhang Lu
PURPOSE: Assessment of brain hemodynamics without exogenous contrast agents is of increasing importance in clinical applications. This study aims to develop an MR perfusion technique that can provide noncontrast and multiparametric estimation of hemodynamic markers. METHODS: We devised an arterial spin labeling (ASL) method based on the principle of MR fingerprinting (MRF), referred to as MRF-ASL. By taking advantage of the rich information contained in MRF sequence, up to seven hemodynamic parameters can be estimated concomitantly...
December 26, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28008390/fordyce-happiness-program-and-happiness-in-mothers-of-children-with-a-cleft-lip-and-palate
#20
Zeinab Hemati, Fatemeh-Sadat Mosavi Asl, Samira Abbasi, Zohre Ghazavi, Davood Kiani
INTRODUCTION: Facial deformities and aesthetic and functional anomalies in children may be a cause of real distress in families. Problems faced by parents in coping with a child's anomaly can be upsetting and lead parents to exhibit over-severe behavior. The present study was conducted in order to study the effect of happiness program on the happiness of the mothers of children with a cleft lip and palate. MATERIALS AND METHODS: In this semi-experimental study, 64 mothers of children with a cleft lip and palate enrolled by convenience random sampling were assigned to an intervention or control group based on a simple random sampling...
November 2016: Iranian Journal of Otorhinolaryngology
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