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https://www.readbyqxmd.com/read/28649200/cognitive-variability-during-middle-age-possible-association-with-neurodegeneration-and-cognitive-reserve
#1
Daniel Ferreira, Alejandra Machado, Yaiza Molina, Antonieta Nieto, Rut Correia, Eric Westman, José Barroso
Objective: Increased variability in cognition with age has been argued as an indication of pathological processes. Focusing on early detection of neurodegenerative disorders, we investigated variability in cognition in healthy middle-aged adults. In order to understand possible determinants of this variability, we also investigated associations with cognitive reserve, neuroimaging markers, subjective memory complaints, depressive symptomatology, and gender. Method: Thirty-one 50 ± 2 years old individuals were investigated as target group and deviation was studied in comparison to a reference younger group of 30 individuals 40 ± 2 years old...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28648655/outcomes-of-foam-sclerotherapy-plus-ligation-versus-foam-sclerotherapy-alone-for-venous-ulcers-in-lower-extremities
#2
Xin Li, Lin Fan, Shiyan Ren, Xianlun Li
BACKGROUND: Foam sclerotherapy (FS) is a safe and effective approach for managing patients with varicose veins and venous ulcers in lower extremities. But, recanalization of the ablated varicose veins and phlebitis are common postoperative complications that jeopardize its clinical effects. We hypothesize that ligation of the ablated varicose veins after FS will improve the outcomes of patients with varicose veins and venous ulcer. This study was aimed to evaluate the clinical efficacy of ligation after FS in comparison with FS alone for the management of patients with varicose veins and venous ulcers in lower extremities...
June 22, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28647020/reprint-of-a-comprehensive-review-of-group-level-model-performance-in-the-presence-of-heteroscedasticity-can-a-single-model-control-type-i-errors-in-the-presence-of-outliers
#3
Jeanette A Mumford
Even after thorough preprocessing and a careful time series analysis of functional magnetic resonance imaging (fMRI) data, artifact and other issues can lead to violations of the assumption that the variance is constant across subjects in the group level model. This is especially concerning when modeling a continuous covariate at the group level, as the slope is easily biased by outliers. Various models have been proposed to deal with outliers including models that use the first level variance or that use the group level residual magnitude to differentially weight subjects...
July 1, 2017: NeuroImage
https://www.readbyqxmd.com/read/28626291/machine-learning-in-a-graph-framework-for-subcortical-segmentation
#4
Zhihui Guo, Satyananda Kashyap, Milan Sonka, Ipek Oguz
Automated and reliable segmentation of subcortical structures from human brain magnetic resonance images is of great importance for volumetric and shape analyses in quantitative neuroimaging studies. However, poor boundary contrast and variable shape of these structures make the automated segmentation a tough task. We propose a 3D graph-based machine learning method, called LOGISMOS-RF, to segment the caudate and the putamen from brain MRI scans in a robust and accurate way. An atlas-based tissue classification and bias-field correction method is applied to the images to generate an initial segmentation for each structure...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28604064/bolus-insulin-dose-error-distributions-based-on-results-from-two-clinical-trials-comparing-blood-glucose-monitoring-systems
#5
Scott Pardo, Nancy Dunne, David A Simmons
BACKGROUND: In 2 previous clinical trials, fingertip capillary blood samples were evaluated using prespecified blood glucose monitoring systems (BGMSs) and a reference YSI glucose analyzer. In post hoc analyses, hypothetical insulin doses were calculated using these blood glucose measurements; dosing errors were compared for each trial. METHOD: For each blood glucose measurement, premeal bolus insulin dosing was determined for a hypothetical person, assuming a 60-g carbohydrate meal and 100-mg/dL target blood glucose level (adjusting 1/25 insulin sensitivity and 1/15 insulin:carbohydrate ratio inputs to account for BGMS measurement error)...
June 1, 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28583116/association-between-total-tau-and-brain-atrophy-one-year-after-first-ever-stroke
#6
Hege Ihle-Hansen, Guri Hagberg, Brynjar Fure, Bente Thommessen, Morten W Fagerland, Anne R Øksengård, Knut Engedal, Per Selnes
BACKGROUND: Although the most serious consequence of neuronal ischemia is acute neuronal death, mounting evidence suggests similarities between stroke and neurodegenerative disease. Brain atrophy visualized on structural MRI and pathological cerebrospinal fluid (CSF) concentrations of microtubule-associated protein tau (T-tau) and phosphorylated microtubule-associated protein tau indicate neurofibrillary degeneration. We aimed to explore the association between CSF T-tau and brain atrophy 1 year post-stroke...
June 5, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28580597/false-fmri-activation-after-motion-correction
#7
Renat Yakupov, Juan Lei, Michael Hoffmann, Oliver Speck
Motion correction of echo-planar imaging (EPI) data used in functional MRI (fMRI) is an essential preprocessing step performed prior to statistical analysis. At ultra-high resolution fMRI, current requirements regarding translational and rotational motion may no longer be acceptable. This prompts the need for a systematic investigation of the effects of motion correction procedures with in vivo fMRI data. Here we systematically evaluated the effect of retrospective motion correction with freely available fMRI analysis software packages (FSL, AFNI, and SPM) on activation maps using fMRI data acquired with prospective motion detection, to identify and quantify confounding effects of retrospective motion correction, and to evaluate its dependence on spatial resolution and motion correction algorithms...
June 5, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28578128/an-ontologically-consistent-mri-based-atlas-of-the-mouse-diencephalon
#8
Charles Watson, Andrew L Janke, Carlo Hamalainen, Shahrzad M Bagheri, George Paxinos, David C Reutens, Jeremy F P Ullmann
In topological terms, the diencephalon lies between the hypothalamus and the midbrain. It is made up of three segments, prosomere 1 (pretectum), prosomere 2 (thalamus), and prosomere 3 (the prethalamus). A number of MRI-based atlases of different parts of the mouse brain have already been published, but none of them displays the segments the diencephalon and their component nuclei. In this study we present a new volumetric atlas identifying 89 structures in the diencephalon of the male C57BL/6J 12 week mouse...
May 31, 2017: NeuroImage
https://www.readbyqxmd.com/read/28574133/technical-feasibility-of-isolated-bowman-layer-graft-preparation-by-femtosecond-laser-a-pilot-study
#9
Jack S Parker, Forest Huls, Elizabeth Cooper, Paul Graves, Esther A Groeneveld-van Beek, Jessica Lie, Gerrit R J Melles
PURPOSE: To evaluate the technical feasibility of isolated Bowman layer (BL) graft preparation by femtosecond laser (FSL) and to compare the ultrastructural morphology to manually dissected grafts. METHODS: Five whole globes were placed in custom-made eye holders and debrided of epithelium. After programming a dissection depth of 20 μm, the FSL was docked into position and 5 isolated BL grafts were created. From 5 additional globes, corneoscleral buttons were procured, mounted in artificial anterior chambers, and stripped of BL via the previously described manual technique...
May 26, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28566144/the-anteroposterior-and-primary-to-posterior-limbic-ratios-as-mri-derived-volumetric-markers-of-alzheimer-s-disease
#10
Adolfo Jiménez-Huete, Susana Estévez-Santé
BACKGROUND/AIMS: Alzheimer's disease (AD) shows a characteristic pattern of brain atrophy, with predominant involvement of posterior limbic structures, and relative preservation of rostral limbic and primary cortical regions. We aimed to investigate the diagnostic utility of two gray matter volume ratios based on this pattern, and to develop a fully automated method to calculate them from unprocessed MRI files. PATIENTS AND METHODS: Cross-sectional study of 118 subjects from the ADNI database, including normal controls and patients with mild cognitive impairment (MCI) and AD...
July 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28546533/comparison-of-accuracy-between-fsl-s-first-and-freesurfer-for-caudate-nucleus-and-putamen-segmentation
#11
Gabor Perlaki, Reka Horvath, Szilvia Anett Nagy, Peter Bogner, Tamas Doczi, Jozsef Janszky, Gergely Orsi
Although several methods have been developed to automatically delineate subcortical gray matter structures from MR images, the accuracy of these algorithms has not been comprehensively examined. Most of earlier studies focused primarily on the hippocampus. Here, we assessed the accuracy of two widely used non-commercial programs (FSL-FIRST and Freesurfer) for segmenting the caudate and putamen. T1-weighted 1 mm(3) isotropic resolution MR images were acquired for thirty healthy subjects (15 females). Caudate nucleus and putamen were segmented manually by two independent observers and automatically by FIRST and Freesurfer (v4...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28514787/delayed-effect-of-active-pressure-treatment-on-endolymphatic-hydrops
#12
Edoardo Covelli, Luigi Volpini, Francesca Atturo, Anna Teresa Benincasa, Chiara Filippi, Silvia Tarentini, Vania Marrone, Simonetta Monini, Annarita Vestri, Maurizio Barbara
OBJECTIVE: To identify eventual correlations between the effect of low-pressure treatment and endolymphatic hydrops in Ménière patients. MATERIAL AND METHODS: The study group consisted of subjects affected by definite Ménière disease (2015) and a severe degree of disability, who received a ventilation tube with or without a low-pressure treatment before undergoing a surgical procedure (vestibular neurectomy). After the placement of the ventilation tube, the subjects were either left alone with the tube or received 1 month of self-administered low-pressure therapy with a portable device...
May 18, 2017: Audiology & Neuro-otology
https://www.readbyqxmd.com/read/28489723/femtosecond-laser-assisted-pterygium-surgery
#13
Matthias Fuest, Yu-Chi Liu, Minas T Coroneo, Jodhbir S Mehta
PURPOSE: Pterygium is a prevalent ocular surface disorder. Conjunctival autografting (CAG) after pterygium resection is the gold standard treatment. Thinner CAGs without Tenon tissue provide better results but are technically difficult to achieve. We report on the first femtosecond laser (FSL)-assisted pterygium surgery (FLAPS) in humans. METHODS: In a clinical trial, we treated 6 eyes of 5 patients with FLAPS. After manual removal of the pterygium, CAGs were dissected with the Ziemer Z8 at 60-μm depth and glued into the resection defect...
July 2017: Cornea
https://www.readbyqxmd.com/read/28451805/role-of-bone-marrow-biopsy-in-staging-of-patients-with-classical-hodgkin-s-lymphoma-undergoing-positron-emission-tomography-computed-tomography
#14
B Puccini, L Nassi, C Minoia, S Volpetti, R Ciancia, P C Riccomagno, A Di Rocco, A Mulè, C Toldo, M C Sassone, R Guariglia, C Filì, E Finolezzi, S Falorio, S Zanon, A Furlan, G Doa, F Zaja
Several studies suggested that staging bone marrow biopsy (BMB) could be omitted in patients with classical Hodgkin's lymphoma (cHL) when a positron emission tomography/computed tomography (PET/CT) is performed at baseline.To address the concordance between BMB and PET/CT in the detection of bone marrow involvement (BMI) and the BMB role in determining the Ann Arbor stage, we retrospectively collected data on 1244 consecutive patients with cHL diagnosed from January 2007 to December 2013. One thousand eighty-five patients who had undergone both BMB and PET/CT were analyzed, comparing the Ann Arbor stage assessed with PET/CT only to that resulting from PET/CT combined with BMB...
July 2017: Annals of Hematology
https://www.readbyqxmd.com/read/28450222/probiotic-treatment-protects-against-the-pro-depressant-like-effect-of-high-fat-diet-in-flinders-sensitive-line-rats
#15
Anders Abildgaard, Betina Elfving, Marianne Hokland, Sten Lund, Gregers Wegener
Major depressive disorder (MDD) is highly associated with dysmetabolic conditions, such as obesity and diabetes mellitus type 2, and the gut microbiota may interact with both disease entities. We have previously shown that a high-fat diet (HFD) exacerbated depressive-like behaviour uniquely in Flinders Sensitive Line (FSL) rats that inherently present with an increased level of depressive-like behaviour compared with Flinders Resistant Line (FRL) rats. We therefore investigated whether multispecies probiotics possessed anti-depressant-like effect in FSL rats or protected against the pro-depressant-like effect of HFD...
April 24, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28448234/leveraging-clinical-imaging-archives-for-radiomics-reliability-of-automated-methods-for-brain-volume-measurement
#16
Viraj R Adduru, Andrew M Michael, Maria Helguera, Stefi A Baum, Gregory J Moore
Purpose To validate the use of thick-section clinically acquired magnetic resonance (MR) imaging data for estimating total brain volume (TBV), gray matter (GM) volume (GMV), and white matter (WM) volume (WMV) by using three widely used automated toolboxes: SPM ( www.fil.ion.ucl.ac.uk/spm/ ), FreeSurfer ( surfer.nmr.mgh.harvard.edu ), and FSL (FMRIB software library; Oxford Centre for Functional MR Imaging of the Brain, Oxford, England, https://fsl.fmrib.ox.ac.uk/fsl ). Materials and Methods MR images from a clinical archive were used and data were deidentified...
April 27, 2017: Radiology
https://www.readbyqxmd.com/read/28441410/creating-and-parameterizing-patient-specific-deep-brain-stimulation-pathway-activation-models-using-the-hyperdirect-pathway-as-an-example
#17
Kabilar Gunalan, Ashutosh Chaturvedi, Bryan Howell, Yuval Duchin, Scott F Lempka, Remi Patriat, Guillermo Sapiro, Noam Harel, Cameron C McIntyre
BACKGROUND: Deep brain stimulation (DBS) is an established clinical therapy and computational models have played an important role in advancing the technology. Patient-specific DBS models are now common tools in both academic and industrial research, as well as clinical software systems. However, the exact methodology for creating patient-specific DBS models can vary substantially and important technical details are often missing from published reports. OBJECTIVE: Provide a detailed description of the assembly workflow and parameterization of a patient-specific DBS pathway-activation model (PAM) and predict the response of the hyperdirect pathway to clinical stimulation...
2017: PloS One
https://www.readbyqxmd.com/read/28431288/longitudinal-whole-brain-atrophy-and-ventricular-enlargement-in-nondemented-parkinson-s-disease
#18
Elijah Mak, Li Su, Guy B Williams, Michael J Firbank, Rachael A Lawson, Alison J Yarnall, Gordon W Duncan, Brit Mollenhauer, Adrian M Owen, Tien K Khoo, David J Brooks, James B Rowe, Roger A Barker, David J Burn, John T O'Brien
We investigated whole-brain atrophy and ventricular enlargement over 18 months in nondemented Parkinson's disease (PD) and examined their associations with clinical measures and baseline CSF markers. PD subjects (n = 100) were classified at baseline into those with mild cognitive impairment (MCI; PD-MCI, n = 36) and no cognitive impairment (PD-NC, n = 64). Percentage of whole-brain volume change (PBVC) and ventricular expansion over 18 months were assessed with FSL-SIENA and ventricular enlargement (VIENA) respectively...
July 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28426817/evaluation-of-machine-learning-algorithms-and-structural-features-for-optimal-mri-based-diagnostic-prediction-in-psychosis
#19
Raymond Salvador, Joaquim Radua, Erick J Canales-Rodríguez, Aleix Solanes, Salvador Sarró, José M Goikolea, Alicia Valiente, Gemma C Monté, María Del Carmen Natividad, Amalia Guerrero-Pedraza, Noemí Moro, Paloma Fernández-Corcuera, Benedikt L Amann, Teresa Maristany, Eduard Vieta, Peter J McKenna, Edith Pomarol-Clotet
A relatively large number of studies have investigated the power of structural magnetic resonance imaging (sMRI) data to discriminate patients with schizophrenia from healthy controls. However, very few of them have also included patients with bipolar disorder, allowing the clinically relevant discrimination between both psychotic diagnostics. To assess the efficacy of sMRI data for diagnostic prediction in psychosis we objectively evaluated the discriminative power of a wide range of commonly used machine learning algorithms (ridge, lasso, elastic net and L0 norm regularized logistic regressions, a support vector classifier, regularized discriminant analysis, random forests and a Gaussian process classifier) on main sMRI features including grey and white matter voxel-based morphometry (VBM), vertex-based cortical thickness and volume, region of interest volumetric measures and wavelet-based morphometry (WBM) maps...
2017: PloS One
https://www.readbyqxmd.com/read/28419883/feasibility-and-safety-of-foam-sclerotherapy-followed-by-a-multiple-subcutaneously-interrupt-ligation-under-local-anaesthesia-for-outpatients-with-varicose-veins
#20
Yan Sun, Xin Li, Zhong Chen, Xianlun Li, Shiyan Ren
PURPOSE: To prospectively evaluate the feasibility and safety of foam sclerotherapy and ligation (FSL) for outpatients with varicose veins under local anaesthesia. METHODS: 136 outpatients with varicose veins who were unwilling to be hospitalized underwent FSL. FSL is a technique in which the dilated varicose veins were ligated subcutaneously after foam sclerotherapy with an absorbable suture. Patients were reviewed at 1, 3, 6 and 12 months after FSL. Pain scores were recorded after FSL...
June 2017: International Journal of Surgery
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