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https://www.readbyqxmd.com/read/28528586/white-matter-connectivity-disruptions-in-early-and-chronic-schizophrenia
#1
M A Di Biase, V L Cropley, B T Baune, J Olver, G P Amminger, C Phassouliotis, C Bousman, P D McGorry, I Everall, C Pantelis, A Zalesky
BACKGROUND: White matter disruptions in schizophrenia have been widely reported, but it remains unclear whether these abnormalities differ between illness stages. We mapped the connectome in patients with recently diagnosed and chronic schizophrenia and investigated the extent and overlap of white matter connectivity disruptions between these illness stages. METHODS: Diffusion-weighted magnetic resonance images were acquired in recent-onset (n = 19) and chronic patients (n = 45) with schizophrenia, as well as age-matched controls (n = 87)...
May 22, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28521048/altered-coupling-between-resting-state-cerebral-blood-flow-and-functional-connectivity-in-schizophrenia
#2
Jiajia Zhu, Chuanjun Zhuo, Lixue Xu, Feng Liu, Wen Qin, Chunshui Yu
Background: Respective changes in resting-state cerebral blood flow (CBF) and functional connectivity in schizophrenia have been reported. However, their coupling alterations in schizophrenia remain largely unknown. Methods: 89 schizophrenia patients and 90 sex- and age-matched healthy controls underwent resting-state functional MRI to calculate functional connectivity strength (FCS) and arterial spin labeling imaging to compute CBF. The CBF-FCS coupling of the whole gray matter and the CBF/FCS ratio (the amount of blood supply per unit of connectivity strength) of each voxel were compared between the 2 groups...
May 17, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28520931/altered-white-matter-connectivity-within-and-between-networks-in-antipsychotic-naive-first-episode-schizophrenia
#3
Fei Li, Su Lui, Li Yao, Gong-Jun Ji, Wei Liao, John A Sweeney, Qiyong Gong
Analyzing the schizophrenia connectome can identify illness-related alterations in connectivity across the brain. An important question that remains unanswered is whether connectivity alterations are already evident at the onset of illness, before treatment with antipsychotic medication and possible influences of neuroprogressive or secondary alterations related to chronic illness duration. In the present study, diffusion tensor imaging and deterministic fiber tractography were performed with 137 antipsychotic-naive first-episode schizophrenia patients and 113 matched healthy controls...
May 17, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28520743/whole-brain-volume-changes-and-its-correlation-with-clinical-symptom-severity-in-patients-with-schizophrenia-a-dartel-based-vbm-study
#4
Gwang-Won Kim, Yun-Hyeon Kim, Gwang-Woo Jeong
The purpose of this study was to evaluate gray matter (GM) and white matter (WM) volume alterations in whole-brain structures in patients with schizophrenia and healthy controls using voxel-based morphometry (VBM), and further to assess the correlation between GM and WM volume variations and symptom severity in schizophrenia. A total of 22 patients with schizophrenia and 22 age-matched healthy controls participated. Magnetic resonance image data were processed using SPM8 software with diffeomorphic anatomical registration via an exponentiated Lie algebra (DARTEL) algorithm...
2017: PloS One
https://www.readbyqxmd.com/read/28512057/normative-morphometric-data-for-cerebral-cortical-areas-over-the-lifetime-of-the-adult-human-brain
#5
Olivier Potvin, Louis Dieumegarde, Simon Duchesne
Proper normative data of anatomical measurements of cortical regions, allowing to quantify brain abnormalities, are lacking. We developed norms for regional cortical surface areas, thicknesses, and volumes based on cross-sectional MRI scans from 2713 healthy individuals aged 18 to 94 years using 23 samples provided by 21 independent research groups. The segmentation was conducted using FreeSurfer, a widely used and freely available automated segmentation software. Models predicting regional cortical estimates of each hemisphere were produced using age, sex, estimated total intracranial volume (eTIV), scanner manufacturer, magnetic field strength, and interactions as predictors...
May 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/28509122/severe-hyponatremia-in-a-patient-with-schizophrenia-associated-with-prolonged-consciousness-disturbance
#6
Kunihiko Yasuda, Takatsugu Iwashita, Yosuke Tayama, Yuko Makino, Ayumu Watanabe, Tatsuro Sano, Taisuke Shimizu, Tomonari Ogawa, Koichi Kanozawa, Hajime Hasegawa
Hyponatremia presents with various central nervous system symptoms during its course and treatment. We treated a patient who presented with a prolonged consciousness disorder and was suspected of having complications of neuroleptic malignant syndrome and osmotic demyelination syndrome (ODS) during the treatment for his hyponatremia, which was caused by syndrome of inappropriate secretion of antidiuretic hormone (SIADH). The patient was a 30-year-old Japanese man who had been under treatment for schizophrenia...
May 2017: CEN Case Reports
https://www.readbyqxmd.com/read/28507321/pet-imaging-of-dopamine-d2-receptor-internalization-in-schizophrenia
#7
J J Weinstein, E van de Giessen, R J Rosengard, X Xu, N Ojeil, G Brucato, R B Gil, L S Kegeles, M Laruelle, M Slifstein, A Abi-Dargham
Recent genetic, molecular and post-mortem studies suggest impaired dopamine (DA)-D2 receptor (D2R) trafficking in patients with schizophrenia (SZ). Imaging and preclinical studies have shown agonist-induced D2R internalization can be imaged with positron emission tomography (PET) using D2R radiotracers combined with psychostimulant challenge. This is feasible if radiotracer binding is measured when postchallenge DA levels have returned to baseline, following the initial competition phase between DA and radiotracer for binding to D2R...
May 16, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28507318/cerebellar-volume-and-cerebellocerebral-structural-covariance-in-schizophrenia-a-multisite-mega-analysis-of-983-patients-and-1349-healthy-controls
#8
T Moberget, N T Doan, D Alnæs, T Kaufmann, A Córdova-Palomera, T V Lagerberg, J Diedrichsen, E Schwarz, M Zink, S Eisenacher, P Kirsch, E G Jönsson, H Fatouros-Bergman, L Flyckt, G Pergola, T Quarto, A Bertolino, D Barch, A Meyer-Lindenberg, I Agartz, O A Andreassen, L T Westlye
Although cerebellar involvement across a wide range of cognitive and neuropsychiatric phenotypes is increasingly being recognized, previous large-scale studies in schizophrenia (SZ) have primarily focused on supratentorial structures. Hence, the across-sample reproducibility, regional distribution, associations with cerebrocortical morphology and effect sizes of cerebellar relative to cerebral morphological differences in SZ are unknown. We addressed these questions in 983 patients with SZ spectrum disorders and 1349 healthy controls (HCs) from 14 international samples, using state-of-the-art image analysis pipelines optimized for both the cerebellum and the cerebrum...
May 16, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28506703/abnormal-asymmetry-of-white-matter-tracts-between-ventral-posterior-cingulate-cortex-and-middle-temporal-gyrus-in-recent-onset-schizophrenia
#9
Sung Woo Joo, Myong-Wuk Chon, Yogesh Rathi, Martha E Shenton, Marek Kubicki, Jungsun Lee
INTRODUCTION: Previous studies have reported abnormalities in the ventral posterior cingulate cortex (vPCC) and middle temporal gyrus (MTG) in schizophrenia patients. However, it remains unclear whether the white matter tracts connecting these structures are impaired in schizophrenia. Our study investigated the integrity of these white matter tracts (vPCC-MTG tract) and their asymmetry (left versus right side) in patients with recent onset schizophrenia. METHOD: Forty-seven patients and 24 age-and sex-matched healthy controls were enrolled in this study...
May 12, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28498274/fornix-structural-connectivity-and-allostatic-load-empirical-evidence-from-schizophrenia-patients-and-healthy-controls
#10
Anya Savransky, Joshua Chiappelli, Laura M Rowland, Krista Wisner, Dinesh K Shukla, Peter Kochunov, L Elliot Hong
OBJECTIVE: The fornix is a white matter tract carrying the fibers connecting the hippocampus and the hypothalamus, two essential stress-regulatory structures of the brain. We tested the hypothesis that allostatic load (AL), derived from a battery of peripheral biomarkers indexing the cumulative effects of stress, is associated with abnormalities in brain white matter microstructure, especially the fornix; and that higher AL may help explain the white matter abnormalities in schizophrenia...
May 12, 2017: Psychosomatic Medicine
https://www.readbyqxmd.com/read/28495493/the-value-of-novelty-in-schizophrenia
#11
Cristina Martinelli, Francesco Rigoli, Bruno Averbeck, Sukhwinder S Shergill
Influential models of schizophrenia suggest that patients experience incoming stimuli as excessively novel and motivating, with important consequences for hallucinatory experience and delusional belief. However, whether schizophrenia patients exhibit excessive novelty value and whether this interferes with adaptive behaviour has not yet been formally tested. Here, we employed a three-armed bandit task to investigate this hypothesis. Schizophrenia patients and healthy controls were first familiarised with a group of images and then asked to repeatedly choose between familiar and unfamiliar images associated with different monetary reward probabilities...
May 8, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28487157/cerebrovascular-reactivity-measured-by-functional-magnetic-resonance-imaging-during-breath-hold-challenge-a-systematic-review
#12
REVIEW
Adam L Urback, Bradley J MacIntosh, Benjamin I Goldstein
Cerebrovascular reactivity (CVR) is the cerebral hemodynamic response to a vasoactive substance. Breath-hold (BH) induced CVR has the advantage of being non-invasive and easy to implement during magnetic resonance imaging (MRI). We systematically reviewed the literature regarding MRI measurement of BH induced CVR. The literature was searched using MEDLINE with the search terms breath-hold; and MRI or cerebrovascular reactivity. The search yielded 2244 results and 54 articles were included. Between-group comparisons have found that CVR was higher among healthy controls than patients with various pathologies (e...
May 6, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28484400/steroid-responsive-chronic-schizophreniform-syndrome-in-the-context-of-mildly-increased-antithyroid-peroxidase-antibodies
#13
Dominique Endres, Evgeniy Perlov, Anne Nicole Riering, Viktoria Maier, Oliver Stich, Rick Dersch, Nils Venhoff, Daniel Erny, Irina Mader, Ludger Tebartz van Elst
BACKGROUND: Schizophreniform syndromes can be divided into primary forms from polygenic causes or secondary forms due to immunological, epileptiform, monogenic, or degenerative causes. Steroid-responsive encephalopathy associated with autoimmune thyroiditis (SREAT) is a secondary immunological form associated with increased thyroid antibodies, such as antithyroid peroxidase antibodies and shows a good response to corticosteroids. CASE PRESENTATION: We present the case of a 41-year-old woman suffering from a schizophreniform syndrome...
2017: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/28483271/-mindful-neuropsychology-mindfulness-based-cognitive-remediation
#14
E Bulzacka, S Lavault, A Pelissolo, C Bagnis Isnard
OBJECTIVES: Mindfulness based interventions (MBI) have recently gained much interest in western medicine. MBSR paradigm is based on teaching participants to pay complete attention to the present experience and act nonjudgmentally towards stressful events. During this mental practice the meditator focuses his or her attention on the sensations of the body. While the distractions (mental images, thoughts, emotional or somatic states) arise the participant is taught to acknowledge discursive thoughts and cultivate the state of awareness without immediate reaction...
May 5, 2017: L'Encéphale
https://www.readbyqxmd.com/read/28483084/development-of-a-tool-to-assess-facial-emotion-recognition-deficits-in-mothers-with-schizophrenia-a-preliminary-report
#15
Sonia Shenoy, Geetha Desai, Prabha S Chandra, Ganesan Venkatsubramanian
There is dearth of studies which have assessed Facial Emotion Recognition Deficits (FERD) in parents and its impact on parenting. To assess FERD in mothers with severe mental illness, a modification of TRENDS (A Tool for Recognition of Emotions in Neuropsychiatric DisorderS) using images of children was developed. Two children emoted six basic emotions,namely happy, sad, fear, anger, surprise and disgust at two different intensities along with neutral facial expressions. These images were then validated by 20 subjects which included 15 healthy controls and 5 qualified psychiatrists...
April 2017: Asian Journal of Psychiatry
https://www.readbyqxmd.com/read/28480992/inferring-pathobiology-from-structural-mri-in-schizophrenia-and-bipolar-disorder-modeling-head-motion-and-neuroanatomical-specificity
#16
Nailin Yao, Anderson M Winkler, Jennifer Barrett, Gregory A Book, Tamara Beetham, Rachel Horseman, Olivia Leach, Karen Hodgson, Emma E Knowles, Samuel Mathias, Michael C Stevens, Michal Assaf, Theo G M van Erp, Godfrey D Pearlson, David C Glahn
Despite over 400 peer-reviewed structural MRI publications documenting neuroanatomic abnormalities in bipolar disorder and schizophrenia, the confounding effects of head motion and the regional specificity of these defects are unclear. Using a large cohort of individuals scanned on the same research dedicated MRI with broadly similar protocols, we observe reduced cortical thickness indices in both illnesses, though less pronounced in bipolar disorder. While schizophrenia (n = 226) was associated with wide-spread surface area reductions, bipolar disorder (n = 227) and healthy comparison subjects (n = 370) did not differ...
May 8, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28480163/reduced-intrinsic-visual-cortical-connectivity-is-associated-with-impaired-perceptual-closure-in-schizophrenia
#17
Vincent van de Ven, Anna Rotarska Jagiela, Viola Oertel-Knöchel, David E J Linden
Sensory perceptual processing deficits, such as impaired visual object identification and perceptual closure, have been reported in schizophrenia. These perceptual impairments may be associated with neural deficits in visual association areas, including lateral occipital cortex and inferior temporal areas. However, it remains unknown if such deficits can be found in the intrinsic architecture of the visual system. In the current study, we measured perceptual closure performance and resting-state functional connectivity using functional magnetic resonance imaging (FMRI) in 16 schizophrenia patients and 16 matched healthy controls...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28479528/-voxel-based-morphometry-for-schizophrenia-a-review
#18
Kiyotaka Nemoto
Various imaging studies have employed voxel based morphometry (VBM) to detect local volume reductions in schizophrenia. Indeed, the first study of VBM was applied to patients with schizophrenia. Patients with schizophrenia show reduced volume in frontal, temporal (especially superior temporal gyrus, parahippocampal gyrus, and amygdala), and limbic regions (including insula and anterior cingulate cortex). Patients also show an increased volume in striatal regions. Even patients with first-episode show volume reduction and the reduced regions extend in accordance with the pathological process, which supports both the neurodevelopmental hypothesis and the neurodegenerative hypothesis...
May 2017: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/28467520/transdiagnostic-associations-between-functional-brain-network-integrity-and-cognition
#19
Julia M Sheffield, Sridhar Kandala, Carol A Tamminga, Godfrey D Pearlson, Matcheri S Keshavan, John A Sweeney, Brett A Clementz, Dov B Lerman-Sinkoff, S Kristian Hill, Deanna M Barch
Importance: Cognitive impairment occurs across the psychosis spectrum and is associated with functional outcome. However, it is unknown whether these shared manifestations of cognitive dysfunction across diagnostic categories also reflect shared neurobiological mechanisms or whether the source of impairment differs. Objective: To examine whether the general cognitive deficit observed across psychotic disorders is similarly associated with functional integrity of 2 brain networks widely implicated in supporting many cognitive domains...
May 3, 2017: JAMA Psychiatry
https://www.readbyqxmd.com/read/28464976/patterns-of-white-matter-microstructure-in-individuals-at-ultra-high-risk-for-psychosis-associations-to-level-of-functioning-and-clinical-symptoms
#20
K Krakauer, B H Ebdrup, B Y Glenthøj, J M Raghava, D Nordholm, L Randers, E Rostrup, M Nordentoft
BACKGROUND: Individuals at ultra-high-risk (UHR) for psychosis present with emerging symptoms and decline in functioning. Previous univariate analyses have indicated widespread white matter (WM) aberrations in multiple brain regions in UHR individuals and patients with schizophrenia. Using multivariate statistics, we investigated whole brain WM microstructure and associations between WM, clinical symptoms, and level of functioning in UHR individuals. METHODS: Forty-five UHR individuals and 45 matched healthy controls (HCs) underwent magnetic resonance diffusion tensor imaging (DTI) at 3 Tesla...
May 3, 2017: Psychological Medicine
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