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https://www.readbyqxmd.com/read/28108358/neurochemical-and-metabolic-effects-of-acute-and-chronic-alcohol-in-the-human-brain-studies-with-positron-emission-tomography
#1
REVIEW
Nora D Volkow, Corinde E Wiers, Ehsan Shokri-Kojori, Dardo Tomasi, Gene-Jack Wang, Ruben Baler
The use of Positron emission tomography (PET) to study the effects of acute and chronic alcohol on the human brain has enhanced our understanding of the mechanisms underlying alcohol's rewarding effects, the neuroadaptations from chronic exposure that contribute to tolerance and withdrawal, and the changes in fronto-striatal circuits that lead to loss of control and enhanced motivation to drink that characterize alcohol use disorders (AUD). These include studies showing that alcohol's reinforcing effects may result not only from its enhancement of dopaminergic, GABAergic and opioid signaling but also from its caloric properties...
January 17, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28108176/differential-housing-and-novelty-response-protection-and-risk-from-locomotor-sensitization
#2
Erik J Garcia, Tara N Haddon, Donald A Saucier, Mary E Cain
: High novelty seeking increases the risk for drug experimentation and locomotor sensitization. Locomotor sensitization to psychostimulants is thought to reflect neurological adaptations that promote the transition to compulsive drug taking. Rats reared in enrichment (EC) show less locomotor sensitization when compared to rats reared in isolation (IC) or standard conditions (SC). The current research study was designed to test if novelty response contributed locomotor sensitization and more importantly, if the different housing environments could change the novelty response to protect against the development of locomotor sensitization in both adolescence and adulthood...
January 17, 2017: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/28108021/phenomenology-and-epidemiology-of-impulsive-compulsive-behaviours-in-parkinson-s-disease-atypical-parkinsonian-disorders-and-non-parkinsonian-populations
#3
REVIEW
Eimer M Maloney, Atbin Djamshidian, Sean S O'Sullivan
Impulsive-compulsive behaviours are common, quality of life affecting consequences of dopamine replacement therapy which are well recognized in patients with idiopathic Parkinson's disease. Details of the occurrence and nature of these disorders in the atypical parkinsonian neurodegenerative disorders, and in non-Parkinson's patients prescribed dopaminergic stimulation for other disease processes, are slowly emerging. Here we review what is known about the phenomenology, epidemiology and risk factors for impulsive-compulsive behaviours in Parkinson's disease and in other, less well studied, patient groups...
December 28, 2016: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28104554/abnormalities-in-metabolite-concentrations-in-tourette-s-disorder-and-obsessive-compulsive-disorder-a-proton-magnetic-resonance-spectroscopy-study
#4
Siyan Fan, Danielle C Cath, Odile A van den Heuvel, Ysbrand D van der Werf, Caroline Schöls, Dick J Veltman, Petra J W Pouwels
INTRODUCTION: Abnormal glutamatergic transmission in cortico-striato-thalamo-cortical (CSTC) circuits is thought to be involved in the pathophysiology of Tourette's disorder (TD) and obsessive-compulsive disorder (OCD). Using proton magnetic resonance spectroscopy, the current study aimed to investigate regional concentrations of glutamatergic compounds in TD and OCD patients in comparison to healthy control subjects (HC). MATERIAL AND METHODS: Twenty-three TD patients, 20 OCD patients and 22 HC were included...
January 4, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28104431/abnormal-regional-spontaneous-neuronal-activity-associated-with-symptom-severity-in-treatment-naive-patients-with-obsessive-compulsive-disorder-revealed-by-resting-state-functional-mri
#5
Linlin Qiu, Xiangshuai Fu, Shuai Wang, Qunfeng Tang, Xingui Chen, Lin Cheng, Fuquan Zhang, Zhenhe Zhou, Lin Tian
A large number of neuroimaging studies have revealed the dysfunction of brain activities in obsessive-compulsive disorder (OCD) during various tasks. However, regional spontaneous activity abnormalities in OCD are gradually being revealed. In this current study, we aimed to investigate cerebral regions with abnormal spontaneous activity using resting-state functional magnetic resonance imaging (fMRI) and further explored the relationship between the spontaneous neuronal activity and symptom severity of patients with OCD...
January 16, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28103527/distinct-cortico-striatal-connections-with-subthalamic-nucleus-underlie-facets-of-compulsivity
#6
Laurel S Morris, Kwangyeol Baek, Valerie Voon
The capacity to flexibly respond to contextual changes is crucial to adapting to a dynamic environment. Compulsivity, or behavioural inflexibility, consists of heterogeneous subtypes with overlapping yet discrete neural substrates. The subthalamic nucleus (STN) mediates the switch from automatic to controlled processing to slow, break or stop behaviour when necessary. Rodent STN lesions or inactivation are linked with perseveration or repetitive, compulsive responding. However, there are few studies examining the role of latent STN-centric neural networks and compulsive behaviour in healthy individuals...
December 29, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28099183/memantine-as-an-adjuvant-treatment-for-obsessive-compulsive-symptoms-in-manic-phase-of-bipolar-disorder-a-randomized-double-blind-placebo-controlled-clinical-trial
#7
Ali Sahraian, Leila Razeghian Jahromi, Ahmad Ghanizadeh, Arash Mowla
PURPOSE/BACKGROUND: The aim of this study is to examine the effects of memantine as an adjuvant treatment for obsessive compulsive (OC) symptoms in patients with bipolar disorder (BD) type I, manic phase. METHODS/PROCEDURES: In this 16-week double-blind placebo-controlled randomized clinical trial, 58 patients in the manic phase of BD who had OC symptoms were randomly allocated to receive memantine or placebo plus their routine medications (lithium + olanzapine + clonazepam)...
January 18, 2017: Journal of Clinical Psychopharmacology
https://www.readbyqxmd.com/read/28099039/gilles-de-la-tourette-syndrome-depression-depressive-illness-and-correlates-in-a-child-and-adolescent-population
#8
Renata Rizzo, Mariangela Gulisano, Davide Martino, Mary May Robertson
OBJECTIVE: Gilles de la Tourette syndrome (GTS) and depression are both common disorders. It has been suggested that depression occurs in 13%-76% GTS patients. Despite this, there are few studies into the specific relationships and correlates between the two disorders. There is only some consensus as to the precise relationship between the two disorders. MATERIALS AND METHODS: We undertook the study to investigate the relationship between depressive symptomatology and the core clinical features of GTS in a well-characterized clinical population of youth with this disorder...
January 18, 2017: Journal of Child and Adolescent Psychopharmacology
https://www.readbyqxmd.com/read/28096676/aripiprazole-augmentation-in-managing-comorbid-obsessive-compulsive-disorder-and-bipolar-disorder-a-case-with-suicidal-attempts
#9
Jianbo Lai, Qiaoqiao Lu, Peng Zhang, Tingting Xu, Yi Xu, Shaohua Hu
Comorbid obsessive-compulsive disorder (OCD) and bipolar disorder (BD) have long been an intractable problem in clinical practice. The increased risk of manic/hypomanic switch hinders the use of antidepressants for managing coexisting OCD symptoms in BD patients. We herein present a case of a patient with BD-OCD comorbidity, who was successfully treated with mood stabilizers and aripiprazole augmentation. The young female patient reported recurrent depressive episodes and aggravating compulsive behaviors before hospitalization...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28096674/alterations-of-white-matter-fractional-anisotropy-in-unmedicated-obsessive-compulsive-disorder
#10
Jiong Tao, Xianglan Wang, Zhiyong Zhong, Hongying Han, Sha Liu, Shenglin Wen, Nianhong Guan, Lingjiang Li
BACKGROUND: Abnormalities in white matter (WM) have previously been reported in patients with obsessive-compulsive disorder (OCD). However, there was some inconsistency in the results obtained for altered regions of WM. The aim of this study was to investigate fractional anisotropy (FA) in the WM of the whole brain in patients with OCD by using diffusion tensor imaging (DTI). METHODS: In total, 28 unmedicated patients with OCD and 28 healthy volunteers underwent DTI scan...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28095945/conflict-monitoring-and-adaptation-as-reflected-by-n2-amplitude-in-obsessive-compulsive-disorder
#11
A Riesel, J Klawohn, N Kathmann, T Endrass
BACKGROUND: Feelings of doubt and perseverative behaviours are key symptoms of obsessive-compulsive disorder (OCD) and have been linked to hyperactive error and conflict signals in the brain. While enhanced neural correlates of error monitoring have been robustly shown, far less is known about conflict processing and adaptation in OCD. METHOD: We examined event-related potentials during conflict processing in 70 patients with OCD and 70 matched healthy comparison participants, focusing on the stimulus-locked N2 elicited in a flanker task...
January 18, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28093835/the-assessment-and-treatment-of-unhealthy-exercise-in-adolescents-with-anorexia-nervosa-a-delphi-study-to-synthesize-clinical-knowledge
#12
Melissa Noetel, Lisa Dawson, Phillipa Hay, Stephen Touyz
This study aimed to explore and synthesize expert clinical knowledge on defining and managing unhealthy exercise in adolescents with AN. The Delphi methodology was used. Clinicians (n = 25) considered experts in the treatment of AN in adolescents were recruited internationally to form the panel. The first round of the questionnaires was comprised of five open-ended questions regarding defining, assessing, and treating unhealthy exercise in adolescents with AN. Statements were derived from this data using content analysis, and included as Likert-based items in two subsequent rounds, in which panellists were required to rate their level of agreement for each item...
January 17, 2017: International Journal of Eating Disorders
https://www.readbyqxmd.com/read/28093822/the-role-of-guilt-sensitivity-in-ocd-symptom-dimensions
#13
Gabriele Melli, Claudia Carraresi, Andrea Poli, Donatella Marazziti, Antonio Pinto
: Although some studies have found that guilt may precede, motivate, or be a consequence of obsessive-compulsive disorder (OCD), the relationship between guilt and OCD has been under investigated. The studies that explored the role of trait guilt (guilt propensity) in OCD reported inconsistent findings and failed to support its predictive role. Since it has been suggested that OCD patients perceive guilt in a more threatening manner, it might also be relevant to test to what extent they negatively evaluate the experience of guilt (i...
January 16, 2017: Clinical Psychology & Psychotherapy
https://www.readbyqxmd.com/read/28093790/a-case-series-of-family-based-treatment-for-adolescents-with-atypical-anorexia-nervosa
#14
Elizabeth K Hughes, Daniel Le Grange, Andrew Court, Susan M Sawyer
The aim of this case series was to examine engagement in and outcomes of family-based treatment (FBT) for adolescents with DSM-5 atypical AN, that is, adolescents who were not underweight at presentation. Consecutive referrals for FBT of adolescents with atypical AN to a specialist child and adolescent eating disorder program were examined. Engagement in treatment (i.e., dose of treatment, completion rate), and changes in psychological symptomatology (i.e., eating disorder symptoms, depressive symptoms, self-esteem, obsessive compulsiveness), weight, and menstrual function were examined...
January 17, 2017: International Journal of Eating Disorders
https://www.readbyqxmd.com/read/28092192/do-i-feel-ill-because-i-crave-for-work-or-do-i-crave-for-work-because-i-feel-ill-a-longitudinal-analysis-of-work-craving-self-regulation-and-health
#15
Kamila Wojdylo, Wilhelm Karlsson, Nicola Baumann
Background The theory of work craving defines workaholism as a pathological work addiction which comprises: (a) obsessive-compulsive desire to work, (b) anticipation of self-worth compensatory incentives from working, (c) anticipation of reduction of negative emotions or withdrawal symptoms from working, and (d) neurotic perfectionism. Research has shown that workaholism is associated with adverse health outcomes. However, the antecedents of workaholism and the causal direction of the relationship with health have been largely neglected...
March 2016: Journal of Behavioral Addictions
https://www.readbyqxmd.com/read/28090807/neurocognitive-function-in-pediatric-obsessive-compulsive-disorder
#16
Daniel A Geller, Amitai Abramovitch, Andrew Mittelman, Abigail Stark, Kesley Ramsey, Allison Cooperman, Lee Baer, S Evelyn Stewart
OBJECTIVES: The small body of neuropsychological research in pediatric OCD yields inconsistent results. A recent meta-analysis found small effect sizes, concluding that pediatric OCD may not be associated with cognitive impairments, stressing the need for more research. We investigated neuropsychological performance in a large sample of OCD youth, while assessing potential moderators. METHODS: Participants with OCD (n = 102), and matched controls (n = 161) were thoroughly screened and blindly evaluated for comorbidities, and completed a neuropsychological battery assessing processing-speed, visuospatial abilities (VSA), working memory (WM), nonverbal memory (NVM), and executive functions (EF)...
January 16, 2017: World Journal of Biological Psychiatry
https://www.readbyqxmd.com/read/28087369/multidimensional-assessment-of-impulsivity-in-relation-to-obesity-and-food-addiction
#17
Lauren VanderBroek-Stice, Monika K Stojek, Steven R H Beach, Michelle R vanDellen, James MacKillop
Based on similarities between overconsumption of food and addictive drugs, there is increasing interest in "food addiction," a compulsive eating pattern defined using symptoms parallel to substance use disorders. Impulsivity, a multidimensional construct robustly linked to drug addiction, has been increasingly examined as an obesity determinant, but with mixed findings. This study sought to clarify relations between three major domains of impulsivity (i.e., impulsive personality traits, discounting of delayed rewards, and behavioral inhibition) in both obesity and food addiction...
January 10, 2017: Appetite
https://www.readbyqxmd.com/read/28078209/cognitive-behavioural-therapy-for-obsessive-compulsive-disorder-co-occurring-with-psychosis-systematic-review-of-evidence
#18
Antonio Tundo, Roberta Necci
AIM: To review available evidence on the use of cognitive behavioural therapy (CBT) for treating obsessive compulsive disorder co-occurring with psychosis. METHODS: In this paper we present a detailed and comprehensive review of the current literature focusing on CBT treatment of obsessive compulsive disorder (OCD) co-occurring with schizophrenia or schizoaffective disorder. We identified relevant literature published between 2001 and May 2016 through MEDLINE/PubMed search using as search string ("obsessive compulsive disorders" or "obsessive compulsive symptoms") and ("schizophrenia" or "schizoaffective disorder" or "psychosis") and ("cognitive behavioural therapy")...
December 22, 2016: World Journal of Psychiatry
https://www.readbyqxmd.com/read/28077511/altered-connectivity-and-synapse-maturation-of-the-hippocampal-mossy-fiber-pathway-in-a-mouse-model-of-the-fragile-x-syndrome
#19
F Scharkowski, Michael Frotscher, David Lutz, Martin Korte, Kristin Michaelsen-Preusse
The Fragile X syndrome (FXS) as the most common monogenetic cause of cognitive impairment and autism indicates how tightly the dysregulation of synapse development is linked to cognitive deficits. Symptoms of FXS include excessive adherence to patterns that point to compromised hippocampal network formation. Surprisingly, one of the most complex hippocampal synapses connecting the dentate gyrus (DG) to CA3 pyramidal neurons has not been analyzed in FXS yet. Intriguingly, we found altered synaptic function between DG and CA3 in a mouse model of FXS (fmr1 knockout [KO]) demonstrated by increased mossy fiber-dependent miniature excitatory postsynaptic current (mEPSC) frequency at CA3 pyramidal neurons together with increased connectivity between granule cells and CA3 neurons...
January 10, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28076681/computational-modeling-of-neurotransmitter-release-evoked-by-electrical-stimulation-non-linear-approaches-to-predicting-stimulation-evoked-dopamine-release
#20
James K Trevathan, Ali Yousefi, Hyung Ook Park, John J Bartoletta, Kip A Ludwig, Kendall H Lee, J Luis Lujan
Neurochemical changes evoked by electrical stimulation of the nervous system have been linked to both therapeutic and undesired effects of neuromodulation therapies used to treat obsessive-compulsive disorder, depression, epilepsy, Parkinson's disease, stroke, hypertension, tinnitus, and many other indications. In fact, interest in better understanding the role of neurochemical signaling in neuromodulation therapies has been a focus of recent government- and industry-sponsored programs whose ultimate goal is to usher in an era of personalized medicine by creating neuromodulation therapies that respond to real-time changes in patient status...
January 11, 2017: ACS Chemical Neuroscience
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