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https://www.readbyqxmd.com/read/28351035/resting-state-functional-connectivity-changes-associated-with-visuospatial-cognitive-deficits-in-patients-with-mild-alzheimer-disease
#1
Rakesh Balachandar, Srikala Bharath, John P John, Himanshu Joshi, Shilpa Sadanand, Jitender Saini, Keshav J Kumar, Mathew Varghese
BACKGROUND/AIMS: Alzheimer disease (AD) is a neurodegenerative disorder characterized by progressive disconnection of various brain networks leading to neuropsychological impairment. Pathology in the visual association areas has been documented in presymptomatic AD and therefore we aimed at examining the relationship between brain connectivity and visuospatial (VS) cognitive deficits in early AD. METHODS: Tests for VS working memory, episodic memory and construction were used to classify patients with AD (n = 48) as having severe VS deficits (n = 12, female = 4) or mild deficits (n = 11, female = 4)...
March 29, 2017: Dementia and Geriatric Cognitive Disorders
https://www.readbyqxmd.com/read/28350795/fine-mapping-of-the-human-leukocyte-antigen-locus-as-a-risk-factor-for-alzheimer-disease-a-case-control-study
#2
Natasha Z R Steele, Jessie S Carr, Luke W Bonham, Ethan G Geier, Vincent Damotte, Zachary A Miller, Rahul S Desikan, Kevin L Boehme, Shubhabrata Mukherjee, Paul K Crane, John S K Kauwe, Joel H Kramer, Bruce L Miller, Giovanni Coppola, Jill A Hollenbach, Yadong Huang, Jennifer S Yokoyama
BACKGROUND: Alzheimer disease (AD) is a progressive disorder that affects cognitive function. There is increasing support for the role of neuroinflammation and aberrant immune regulation in the pathophysiology of AD. The immunoregulatory human leukocyte antigen (HLA) complex has been linked to susceptibility for a number of neurodegenerative diseases, including AD; however, studies to date have failed to consistently identify a risk HLA haplotype for AD. Contributing to this difficulty are the complex genetic organization of the HLA region, differences in sequencing and allelic imputation methods, and diversity across ethnic populations...
March 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28350777/understanding-brain-reorganization-in-infants-with-perinatal-stroke-through-neuroexcitability-and-neuroimaging
#3
Chao-Ying Chen, Michael Georgieff, Jed Elison, Mo Chen, James Stinear, Bryon Mueller, Raghavendra Rao, Kyle Rudser, Bernadette Gillick
PURPOSE: The primary aim of this proposed study is to evaluate brain reorganization patterns in infants with perinatal stroke between 3 and 5 months of age using transcranial magnetic stimulation and magnetic resonance imaging, with the addition of the General Movements Assessment. A secondary aim is to demonstrate feasibility and safety of infant-appropriate brain assessment protocols. METHODS: Ten infants with perinatal stroke will be enrolled. In this exploratory study, infants will first receive magnetic resonance imaging scanning during natural sleep to examine their corticospinal tract integrity...
April 2017: Pediatric Physical Therapy
https://www.readbyqxmd.com/read/28350571/vertebrobasilar-dolichoectasia-causing-an-optic-tract-syndrome
#4
Brandon B Holmes, Wesley C Green, Nathan H Kung, Joel A Goebel, Gregory P Van Stavern
Vertebrobasilar dolichoectasia (VBD) is characterized by significant dilation, elongation, and tortuosity of the vertebrobasilar system. We present a unique case of VBD, confirmed by neuroimaging studies, showing vascular compression of the right optic tract and lower cranial nerves leading to an incongruous left homonymous inferior quadrantanopia and glossopharyngeal neuralgia.
March 27, 2017: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/28346953/lennox-gastaut-syndrome-a-state-of-the-art-review
#5
Mario Mastrangelo
Lennox-Gastaut syndrome (LGS) is a severe age-dependent epileptic encephalopathy usually with onset between 1 and 8 years of age. Functional neuroimaging studies recently introduced the concept of Lennox-Gastaut as "secondary network epilepsy" resulting from dysfunctions of a complex system involving both cortical and subcortical structures (default-mode network, corticoreticular connections, and thalamus). These dysfunctions are produced by different disorders including hypoxic-ischemic encephalopathies, meningoencephalitis, cortical malformations, neurocutaneous disorders, or tumors...
March 27, 2017: Neuropediatrics
https://www.readbyqxmd.com/read/28346760/commentary-critical-considerations-for-studying-low-functioning-autism
#6
Bhismadev Chakrabarti
Jack and Pelphrey provide a systematic review of neuroimaging studies in understudied populations within the autistic spectrum, focussing specifically on those with minimal verbal ability, intellectual disability and developmental regression. Despite accounting for nearly a third of the autistic spectrum, the number of studies focussing on these populations is extremely low. This review highlights a critical need for further neuroimaging research on these populations, and provides practical suggestions for overcoming the challenges posed by it...
April 2017: Journal of Child Psychology and Psychiatry, and Allied Disciplines
https://www.readbyqxmd.com/read/28346578/association-of-plasma-neurofilament-light-with-neurodegeneration-in-patients-with-alzheimer-disease
#7
Niklas Mattsson, Ulf Andreasson, Henrik Zetterberg, Kaj Blennow
Importance: Existing cerebrospinal fluid (CSF) or imaging (tau positron emission tomography) biomarkers for Alzheimer disease (AD) are invasive or expensive. Biomarkers based on standard blood test results would be useful in research, drug development, and clinical practice. Plasma neurofilament light (NFL) has recently been proposed as a blood-based biomarker for neurodegeneration in dementias. Objective: To test whether plasma NFL concentrations are increased in AD and associated with cognitive decline, other AD biomarkers, and imaging evidence of neurodegeneration...
March 27, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28346539/is-there-a-relation-between-novelty-seeking-striatal-dopamine-release-and-frontal-cortical-thickness
#8
Natalia Jaworska, Sylvia M Cox, Kevin F Casey, Isabelle Boileau, Mariya Cherkasova, Kevin Larcher, Alain Dagher, Chawki Benkelfat, Marco Leyton
BACKGROUND: Novelty-seeking (NS) and impulsive personality traits have been proposed to reflect an interplay between fronto-cortical and limbic systems, including the limbic striatum (LS). Although neuroimaging studies have provided some evidence for this, most are comprised of small samples and many report surprisingly large effects given the challenges of trying to relate a snapshot of brain function or structure to an entity as complex as personality. The current work tested a priori hypotheses about associations between striatal dopamine (DA) release, cortical thickness (CT), and NS in a large sample of healthy adults...
2017: PloS One
https://www.readbyqxmd.com/read/28345282/neuroplasticity-of-language-in-left-hemisphere-stroke-evidence-linking-subsecond-electrophysiology-and-structural-connections
#9
Vitória Piai, Lars Meyer, Nina F Dronkers, Robert T Knight
The understanding of neuroplasticity following stroke is predominantly based on neuroimaging measures that cannot address the subsecond neurodynamics of impaired language processing. We combined behavioral and electrophysiological measures and structural-connectivity estimates to characterize neuroplasticity underlying successful compensation of language abilities after left-hemispheric stroke. We recorded the electroencephalogram from patients with stroke lesions to the left temporal lobe and from matched controls during context-driven word retrieval...
March 27, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28344933/precision-medicine-the-golden-gate-for-detection-treatment-and-prevention-of-alzheimer-s-disease
#10
H Hampel, S E O'Bryant, J I Castrillo, C Ritchie, K Rojkova, K Broich, N Benda, R Nisticò, R A Frank, B Dubois, V Escott-Price, S Lista
During this decade, breakthrough conceptual shifts have commenced to emerge in the field of Alzheimer's disease (AD) recognizing risk factors and the non-linear dynamic continuum of complex pathophysiologies amongst a wide dimensional spectrum of multi-factorial brain proteinopathies/neurodegenerative diseases. As is the case in most fields of medicine, substantial advancements in detecting, treating and preventing AD will likely evolve from the generation and implementation of a systematic precision medicine strategy...
December 2016: Journal of Prevention of Alzheimer's Disease
https://www.readbyqxmd.com/read/28344687/disseminated-pancreatic-neuroendocrine-neoplasm-nen-with-an-uncommon-localisation-in-the-central-nervous-system-a-case-report
#11
Joanna Białkowska, Agnieszka Kolasińska-Ćwikła, Dorota Mroczkowska, Mariusz Sowa, Łukasz Grabarczyk, Wojciech Maksymowicz, Andrzej Cichocki, Jarosław B Ćwikła
BACKGROUND: Neuroendocrine neoplasms (NEN) are rare neoplasms that originate from neuroendocrine cells and are characterized by the potential of hormonal activity. Approximately 70% of these tumours are located in the gastrointestinal system (GI), followed by the bronchi, endocrine glands-like C cells of the thyroid (medullary carcinoma), the parasympathetic and sympathetic system (paragangliomas, pheochromocytoma) and other very rare locations. The prevalence of cerebral metastases in neuroendocrine tumours is estimated by various authors to be approximately 1...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28344552/adding-recognition-discriminability-index-to-the-delayed-recall-is-useful-to-predict-conversion-from-mild-cognitive-impairment-to-alzheimer-s-disease-in-the-alzheimer-s-disease-neuroimaging-initiative
#12
María J Russo, Jorge Campos, Silvia Vázquez, Gustavo Sevlever, Ricardo F Allegri
Background: Ongoing research is focusing on the identification of those individuals with mild cognitive impairment (MCI) who are most likely to convert to Alzheimer's disease (AD). We investigated whether recognition memory tasks in combination with delayed recall measure of episodic memory and CSF biomarkers can predict MCI to AD conversion at 24-month follow-up. Methods: A total of 397 amnestic-MCI subjects from Alzheimer's disease Neuroimaging Initiative were included. Logistic regression modeling was done to assess the predictive value of all RAVLT measures, risk factors such as age, sex, education, APOE genotype, and CSF biomarkers for progression to AD...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28344551/construction-and-analysis-of-weighted-brain-networks-from-sice-for-the-study-of-alzheimer-s-disease
#13
Jorge Munilla, Andrés Ortiz, Juan M Górriz, Javier Ramírez
Alzheimer's Disease (AD) is the most common neurodegenerative disease in elderly people, and current drugs, unfortunately, do not represent yet a cure but only slow down its progression. This is explained, at least in part, because the understanding of the neurodegenerative process is still incomplete, being sometimes mistaken, particularly at the first steps of the illness, with the natural aging process. A better identification of how the functional activity deteriorates is thus crucial to develop new and more effective treatments...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/28344075/functional-reorganization-in-obstructive-sleep-apnoea-and-insomnia-a-systematic-review-of-the-resting-state-fmri
#14
REVIEW
Habibolah Khazaie, Mattia Veronese, Khadijeh Noori, Farnoosh Emamian, Mojtaba Zarei, Keyoumars Ashkan, Guy D Leschziner, Claudia R Eickhoff, Simon B Eickhoff, Mary J Morrell, Ricardo S Osorio, Kai Spiegelhalder, Masoud Tahmasian, Ivana Rosenzweig
Functional neuroimaging techniques have accelerated progress in the study of sleep disorders. Considering the striking prevalence of these disorders in the general population, however, as well as their strong bidirectional relationship with major neuropsychiatric disorders, including major depressive disorder, their numbers are still surprisingly low. This review examines the contribution of resting state functional MRI to current understanding of two major sleep disorders, insomnia disorder and obstructive sleep apnoea...
March 23, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28343986/the-hemodynamic-signal-as-a-first-order-low-pass-temporal-filter-evidence-and-implications-for-neuroimaging-studies
#15
Antoine Sauvage, Guillaume Hubert, Jonathan Touboul, Jérôme Ribot
Neuronal activation triggers local changes in blood flow and hemoglobin oxygenation. These hemodynamic signals can be recorded through functional magnetic resonance imaging or intrinsic optical imaging, and allows inferring neural activity in response to stimuli. These techniques are widely used to uncover functional brain architectures. However, their accuracy suffers from distortions inherent to hemodynamic responses and noise. The analysis of these signals currently relies on models of impulse hemodynamic responses to brief stimuli...
March 23, 2017: NeuroImage
https://www.readbyqxmd.com/read/28343842/cranial-nerve-palsy-following-central-neuraxial-block-in-obstetrics-a-review-of-the-literature-and-analysis-of-43-case-reports
#16
D J Chambers, K Bhatia
BACKGROUND: Cranial nerve palsy is a rarely reported complication of central neuraxial block in obstetrics. The aetiology is diverse and includes both decreased and increased intracranial pressure. METHODS: Medline, CINAHL, and EMBASE databases were searched to identify cases of cranial nerve palsy following obstetric central neuraxial block. Possible aetiology, clinical symptoms and signs, treatment, and time to resolution were assessed. RESULTS: Forty-one articles containing 43 case reports of cranial nerve palsy following obstetric central neuraxial block were identified...
February 20, 2017: International Journal of Obstetric Anesthesia
https://www.readbyqxmd.com/read/28343188/multimodal-evoked-potentials-in-patients-with-multiple-sclerosis-in-assessment-of-the-course-of-the-disease
#17
Beata Łabuz-Roszak, Magdalena Torbus, Katarzyna Kubicka-Bączyk, Agnieszka Machowska-Majchrzak, Agata Kierber, Katarzyna Borucka, Małgorzata Zellner, Anna Starostak-Tatar, Krystyna Pierzchała
INTRODUCTION: Multiple sclerosis (MS) is a chronic inflammatory, demyelinating disease of the central nervous system with a multifocal damage. THE AIM: The assessment of the MS course by multimodal evoked potentials (EP). MATERIAL AND METHODS: We evaluated 95 patients (63 female, 32 male) with relapsing-remitting MS in the average age of 36.4±10.4. The average disease duration was 4.6±7.4 year. Among them, 48 patients (50.5%) were treated with immunomodulatory drugs...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28342882/functional-neuroimaging-findings-in-healthy-middle-aged-adults-at-risk-of-alzheimer-s-disease
#18
REVIEW
Mirette Habib, Elijah Mak, Silvy Gabel, Li Su, Guy Williams, Adam Waldman, Katie Wells, Karen Ritchie, Craig Ritchie, John T O'Brien
It is well established that the neurodegenerative process of Alzheimer's disease (AD) begins many years before symptom onset. This preclinical phase provides a crucial time-window for therapeutic intervention, though this requires biomarkers that could evaluate the efficacy of future disease-modification treatments in asymptomatic individuals. The last decade has witnessed a proliferation of studies characterizing the temporal sequence of the earliest functional and structural brain imaging changes in AD. These efforts have focused on studying individuals who are highly vulnerable to develop AD, such as those with familial genetic mutations, susceptibility genes (i...
March 22, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28342697/recent-publications-from-the-alzheimer-s-disease-neuroimaging-initiative-reviewing-progress-toward-improved-ad-clinical-trials
#19
REVIEW
Michael W Weiner, Dallas P Veitch, Paul S Aisen, Laurel A Beckett, Nigel J Cairns, Robert C Green, Danielle Harvey, Clifford R Jack, William Jagust, John C Morris, Ronald C Petersen, Andrew J Saykin, Leslie M Shaw, Arthur W Toga, John Q Trojanowski
INTRODUCTION: The Alzheimer's Disease Neuroimaging Initiative (ADNI) has continued development and standardization of methodologies for biomarkers and has provided an increased depth and breadth of data available to qualified researchers. This review summarizes the 450+ publications using ADNI data during 2014 and 2015. METHODS: We used standard searches to find publications using ADNI data. RESULTS: (1) Structural and functional changes, including subtle changes to hippocampal shape and texture, atrophy in areas outside of hippocampus, and disruption to functional networks, are detectable in presymptomatic subjects before hippocampal atrophy; (2) In subjects with abnormal β-amyloid deposition (Aβ+), biomarkers become abnormal in the order predicted by the amyloid cascade hypothesis; (3) Cognitive decline is more closely linked to tau than Aβ deposition; (4) Cerebrovascular risk factors may interact with Aβ to increase white-matter (WM) abnormalities which may accelerate Alzheimer's disease (AD) progression in conjunction with tau abnormalities; (5) Different patterns of atrophy are associated with impairment of memory and executive function and may underlie psychiatric symptoms; (6) Structural, functional, and metabolic network connectivities are disrupted as AD progresses...
March 22, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28341991/altered-interhemispheric-functional-connectivity-in-patients-with-anisometropic-and-strabismic-amblyopia-a-resting-state-fmri-study
#20
Minglong Liang, Bing Xie, Hong Yang, Xuntao Yin, Hao Wang, Longhua Yu, Sheng He, Jian Wang
PURPOSE: Altered brain functional connectivity has been reported in patients with amblyopia by recent neuroimaging studies. However, relatively little is known about the alterations in interhemispheric functional connectivity in amblyopia. The present study aimed to investigate the functional connectivity patterns between homotopic regions across hemispheres in patients with anisometropic and strabismic amblyopia under resting state. METHODS: Nineteen monocular anisometropic amblyopia (AA), 18 strabismic amblyopia (SA), and 20 normal-sight controls (NC) were enrolled in this study...
March 24, 2017: Neuroradiology
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