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https://www.readbyqxmd.com/read/28611367/the-hippocampus-sparing-volume-modulated-arc-therapy-does-not-influence-plan-quality-on-locally-advanced-nasopharyngeal-carcinoma-patients
#1
Wendong Gu, Qilin Li, Dan Xi, Ye Tian, Juncong Mo, Honglei Pei
Irradiation on hippocampus would lead to neuro-cognitive dysfunction in locally advanced nasopharyneal carcinoma (LA-NPC) patients accepting radiotherapy. Our study here aimed to investigate if undergoing hippocampus sparing (HS) volume modulated arc therapy (VMAT) would influence the plan quality in LA NPC patients. We designed three kinds of radiotherapeutic plans for 11 LA NPC patients: conventional VMAT (C-VMAT), HS-VMAT and HS intensity modulated radiation therapy with dynamic multileaf collimator (HS-dMLC)...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28599843/psychiatric-care-of-the-radiation-oncology-patient
#2
REVIEW
Emily G Holmes, Jordan A Holmes, Eliza M Park
BACKGROUND: In recent decades, psychiatrists have become increasingly involved in the care of patients with cancer. Psychiatrists are often less familiar with the field of radiation oncology than with other medical specialties. OBJECTIVE: Therefore, it is beneficial for consulting psychiatrists to be familiar with the basic principles of radiation therapy (RT) and its potential neuropsychiatric sequelae. METHODS: We performed a PubMed search to identify articles describing neuropsychiatric symptoms resulting from RT, including anxiety, claustrophobia, posttraumatic stress disorder, and neurocognitive impairment...
April 15, 2017: Psychosomatics
https://www.readbyqxmd.com/read/28596117/disrupted-white-matter-structural-networks-in-healthy-older-adults-apoe-%C3%AE%C2%B54-carriers-an-international-multicenter-dti-study
#3
Enrica Cavedo, Simone Lista, Katrine Rojkova, Patrizia Andrea Chiesa, Marion Houot, Katharina Brueggen, Janusch Blautzik, Arun L W Bokde, Bruno Dubois, Frederik Barkhof, Petra J W Pouwels, Stefan Teipel, Harald Hampel
The ε4 allelic variant of the Apolipoprotein E gene (APOE ε4) is the best-established genetic risk factor for late-onset Alzheimer's disease (AD). White matter (WM) microstructural damages measured with Diffusion Tensor Imaging (DTI) represent an early sign of fiber tract disconnection in AD. We examined the impact of APOEε4 on WM microstructure in elderly individuals from the multicenter European DTI Study on Dementia. Voxelwise statistical analysis of Fractional anisotropy (FA), mean diffusivity, radial and axial diffusivity (MD, radD and axD respectively) was carried out using Tract-Based Spatial Statistics...
June 5, 2017: Neuroscience
https://www.readbyqxmd.com/read/28592900/white-matter-microstructural-changes-are-related-to-cognitive-dysfunction-in-essential-tremor
#4
Julián Benito-León, Virginia Mato-Abad, Elan D Louis, Juan Antonio Hernández-Tamames, Juan Álvarez-Linera, Félix Bermejo-Pareja, Ángela Domingo-Santos, Luis Collado, Juan Pablo Romero
Diffusion tensor imaging (DTI) studies have detected white matter microstructural changes in essential tremor (ET). However, it is still unclear whether these changes are related to cognitive deficits, which have been described in ET patients. DTI-derived fractional anisotropy, mean diffusivity (MD), axial diffusivity (AD), and radial diffusivity measures were compared between 23 ET patients and 23 age-, gender-, and education-matched healthy individuals, using whole-brain tract-based spatial statistics. Correlations of white matter changes with scores obtained from a detailed neuropsychological assessment were subsequently examined...
June 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28587054/later-life-changes-in-hippocampal-neurogenesis-and-behavioral-functions-after-low-dose-prenatal-irradiation-at-early-organogenesis-stage
#5
Ramya Ganapathi, Kailash Manda
PURPOSE: To investigate long-term changes in behavioral functions of mice after exposure to low-dose prenatal radiation at an early organogenesis stage. METHODS AND MATERIALS: Pregnant C57BL/6J mice were irradiated (20 cGy) at postcoitus day 5.5. The male and female offspring were subjected to different behavioral assays for affective, motor, and cognitive functions at 3, 6, and 12 months of age. Behavioral functions were further correlated with the population of CA1 and CA3 pyramidal neurons and immature neurons in hippocampal dentate gyrus...
May 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28581401/prospective-study-of-hippocampal-sparing-prophylactic-cranial-irradiation-in-limited-stage-small-cell-lung-cancer
#6
Kristin J Redmond, Russell K Hales, Heather Anderson-Keightly, Xian C Zhou, Megan Kummerlowe, Haris I Sair, Mario Duhon, Lawrence Kleinberg, Gary L Rosner, Tracy Vannorsdall
PURPOSE: To prospectively evaluate cognitive function and intracranial failure patterns after hippocampal-sparing prophylactic cranial irradiation (PCI) for limited-stage small cell lung cancer (SCLC). METHODS AND MATERIALS: Adults with limited-stage SCLC, achieving a complete response to chemoradiotherapy and no brain metastases, were eligible. Patients received PCI 25 Gy/10 fractions, with a mean hippocampal dose limited to <8 Gy and ≥90% of the brain receiving 90% of the prescription...
July 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28579941/chronic-ketamine-exposure-causes-white-matter-microstructural-abnormalities-in-adolescent-cynomolgus-monkeys
#7
Qi Li, Lin Shi, Gang Lu, Hong-Luan Yu, Fu-Ki Yeung, Nai-Kei Wong, Lin Sun, Kai Liu, David Yew, Fang Pan, De-Feng Wang, Pak C Sham
Acute and repeated exposures to ketamine mimic aspects of positive, negative, and cognitive symptoms of schizophrenia in humans. Recent studies by our group and others have shown that chronicity of ketamine use may be a key element for establishing a more valid model of cognitive symptoms of schizophrenia. However, current understanding on the long-term consequences of ketamine exposure on brain circuits has remained incomplete, particularly with regard to microstructural changes of white matter tracts that underpin the neuropathology of schizophrenia...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28566124/melatonin-for-prevention-of-erythema-and-oxidative-stress-in-response-to-ultraviolet-radiation
#8
Cecilie Scheuer
Skin damage induced by UVR is an escalating problem in dermatology, and increasing incidence of skin cancer, especially for non-melanoma skin cancer, has been reported worldwide. UVR from sun exposure and the production of reactive oxygen species (ROS) is known to be a pivotal factor in the aetiology of skin cancer. The pineal hormone melatonin is recognized as the most potent endogenous antioxidant. Melatonin conducts its antioxidant effects acting directly as a radical scavenger and indirectly by up regulation of antioxidant enzymes...
June 2017: Danish Medical Journal
https://www.readbyqxmd.com/read/28560737/reduced-regional-cerebral-blood-flow-in-patients-with-heart-failure
#9
Bhaswati Roy, Mary A Woo, Danny J J Wang, Gregg C Fonarow, Ronald M Harper, Rajesh Kumar
AIMS: Heart failure (HF) patients show significant lateralized neural injury, accompanied by autonomic, mood and cognitive deficits. Both gray and white matter damage occurs and probably develops from altered cerebral blood flow (CBF), a consequence of impaired cardiac output. However, the distribution of regional CBF changes in HF patients is unknown, but is an issue in determining mechanisms of neural injury. Our aim was to compare regional CBF changes in HF with CBF in control subjects using non-invasive pseudo-continuous arterial spin labelling (ASL) procedures...
May 30, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28554507/track-structure-model-of-microscopic-energy-deposition-by-protons-and-heavy-ions-in-segments-of-neuronal-cell-dendrites-represented-by-cylinders-or-spheres
#10
Murat Alp, Francis A Cucinotta
Changes to cognition, including memory, following radiation exposure are a concern for cosmic ray exposures to astronauts and in Hadron therapy with proton and heavy ion beams. The purpose of the present work is to develop computational methods to evaluate microscopic energy deposition (ED) in volumes representative of neuron cell structures, including segments of dendrites and spines, using a stochastic track structure model. A challenge for biophysical models of neuronal damage is the large sizes (> 100µm) and variability in volumes of possible dendritic segments and pre-synaptic elements (spines and filopodia)...
May 2017: Life Sciences in Space Research
https://www.readbyqxmd.com/read/28552517/cost-effectiveness-analysis-of-stereotactic-radiosurgery-alone-versus-stereotactic-radiosurgery-with-upfront-whole-brain-radiation-therapy-for-brain-metastases
#11
H Kim, M S Rajagopalan, S Beriwal, K J Smith
AIMS: Stereotactic radiosurgery (SRS) alone or upfront whole brain radiation therapy (WBRT) plus SRS are the most commonly used treatment options for one to three brain oligometastases. The most recent randomised clinical trial result comparing SRS alone with upfront WBRT plus SRS (NCCTG N0574) has favoured SRS alone for neurocognitive function, whereas treatment options remain controversial in terms of cognitive decline and local control. The aim of this study was to conduct a cost-effectiveness analysis of these two competing treatments...
May 25, 2017: Clinical Oncology: a Journal of the Royal College of Radiologists
https://www.readbyqxmd.com/read/28549335/microstructural-alterations-of-white-matter-in-juvenile-myoclonic-epilepsy
#12
Jinnan Gong, Xuebin Chang, Sisi Jiang, Benjamin Klugah-Brown, Song Tan, Dezhong Yao, Cheng Luo
Juvenile myoclonic epilepsy (JME) is a common type of idiopathic generalized epilepsy that is characterized by myoclonic jerks of the upper limbs and generalized tonic-clonic seizures. Frontal cognitive dysfunctions and abnormal coupling of the thalamocortical system have been found in neuropsychological and neuroimaging studies. This study intended to explore white matter (WM) measurement changes in JME using MRI. Twenty-six patients with JME and 25 healthy controls (HC) were recruited for the acquisition of diffusion MRI and structural MRI data...
April 4, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28543437/the-adenoid-its-history-and-a-cautionary-tale
#13
Robert J Ruben
The existence of the adenoid first appears to have been noted by Conrad Victor Schneider in 1661. James Yearsley reported in 1842 one case in which he improved hearing by removal of a mucus membrane from behind the uvula, which indicates some appreciation of a relationship of the nasopharynx to ear disease. Hans Wilhelm Meyer, in 1868, was the first to demonstrate the relationship of the adenoid to ear disease and to develop an effective, although somewhat difficult, surgical operation to remove the adenoid...
June 2017: Laryngoscope
https://www.readbyqxmd.com/read/28541578/disrupted-development-and-integrity-of-frontal-white-matter-in-patients-treated-for-pediatric-medulloblastoma
#14
John O Glass, Robert J Ogg, Jung W Hyun, Julie H Harreld, Jane E Schreiber, Yimei Li, Amar J Gajjar, Wilburn E Reddick
Background.: Treatment of pediatric medulloblastoma is associated with known neurocognitive deficits that we hypothesize are caused by microstructural damage to frontal white matter (WM). Methods.: Longitudinal MRI examinations were collected from baseline (after surgery but before therapy) to 36 months in 146 patients and at 3 time points in 72 controls. Regional analyses of frontal WM volume and diffusion tensor imaging metrics were performed and verified with tract-based spatial statistics...
May 25, 2017: Neuro-oncology
https://www.readbyqxmd.com/read/28538520/radiation-induced-cerebellar-cerebral-functional-connectivity-alterations-in-nasopharyngeal-carcinoma-patients
#15
Qiongmin Ma, Ling-Li Zeng, Jian Qin, Zhiguo Luo, Jianpo Su, Donglin Wu, Shijun Qiu, Dewen Hu
The current study aimed to investigate the altered cerebellar-cerebral functional connectivity (FC) induced by radiotherapy to nasopharyngeal carcinoma (NPC) patients. Twenty-four NPC patients without treatment, and 35 NPC patients receiving radiotherapy underwent functional MRI scanning. Montreal cognitive assessment (MoCA) was performed to evaluate the cognitive status of all participants. FC between 10 predefined cerebellar seeds, which were demonstrated to be involved in different brain functional networks, and all brain voxels was obtained for each participant...
May 19, 2017: Neuroreport
https://www.readbyqxmd.com/read/28536205/severe-retinopathy-of-prematurity-predicts-delayed-white-matter-maturation-and-poorer-neurodevelopment
#16
Torin J A Glass, Vann Chau, Jane Gardiner, Justin Foong, Jillian Vinall, Jill G Zwicker, Ruth E Grunau, Anne Synnes, Kenneth J Poskitt, Steven P Miller
OBJECTIVE: To determine whether severe retinopathy of prematurity (ROP) is associated with (1) abnormal white matter maturation and (2) neurodevelopmental outcomes at 18 months' corrected age (CA) compared with neonates without severe ROP. DESIGN: We conducted a prospective longitudinal cohort of extremely preterm neonates born 24-28 weeks' gestational age recruited between 2006 and 2013 with brain MRIs obtained both early in life and at term-equivalent age. Severe ROP was defined as ROP treated with retinal laser photocoagulation...
May 23, 2017: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/28529753/assessment-of-xerostomia-and-its-impact-on-quality-of-life-in-head-and-neck-cancer-patients-undergoing-radiation-therapy
#17
Pinelopi-Theopisti Memtsa, Maria Tolia, Ioannis Tzitzikas, John Bizakis, Kyriaki Pistevou-Gombaki, Martha Charalambidou, Chrysoula Iliopoulou, George Kyrgias
Xerostomia in head and neck (H&N) cancer patients significantly affects their quality of life (QoL). The aim of the present study was to investigate the associations among QoL, xerostomia and quantity of saliva in a sample of H&N cancer patients who had received conventional radiotherapy (RT). A total of 60 H&N adult patients were enrolled in this prospective study. The patients completed the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (QLQ-C30), the Quality of Life Questionnaire Head and Neck Module (QLQ-H&N35) and the Greek version of the XQ questionnaire at 4 timepoints: At the beginning of RT, at the end of RT, 6 months after RT completion and 1 year after RT completion...
May 2017: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/28529513/ionizing-radiation-induced-immune-and-inflammatory-reactions-in-the-brain
#18
REVIEW
Katalin Lumniczky, Tünde Szatmári, Géza Sáfrány
Radiation-induced late brain injury consisting of vascular abnormalities, demyelination, white matter necrosis, and cognitive impairment has been described in patients subjected to cranial radiotherapy for brain tumors. Accumulating evidence suggests that various degrees of cognitive deficit can develop after much lower doses of ionizing radiation, as well. The pathophysiological mechanisms underlying these alterations are not elucidated so far. A permanent deficit in neurogenesis, chronic microvascular alterations, and blood-brain barrier dysfunctionality are considered among the main causative factors...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28508545/comparison-of-joint-modeling-and-landmarking-for-dynamic-prediction-under-an-illness-death-model
#19
Krithika Suresh, Jeremy M G Taylor, Daniel E Spratt, Stephanie Daignault, Alexander Tsodikov
Dynamic prediction incorporates time-dependent marker information accrued during follow-up to improve personalized survival prediction probabilities. At any follow-up, or "landmark", time, the residual time distribution for an individual, conditional on their updated marker values, can be used to produce a dynamic prediction. To satisfy a consistency condition that links dynamic predictions at different time points, the residual time distribution must follow from a prediction function that models the joint distribution of the marker process and time to failure, such as a joint model...
May 16, 2017: Biometrical Journal. Biometrische Zeitschrift
https://www.readbyqxmd.com/read/28504422/effects-of-mobile-phones-on-children-s-and-adolescents-health-a-commentary
#20
Lennart Hardell
The use of digital technology has grown rapidly during the last couple of decades. During use, mobile phones and cordless phones emit radiofrequency (RF) radiation. No previous generation has been exposed during childhood and adolescence to this kind of radiation. The brain is the main target organ for RF emissions from the handheld wireless phone. An evaluation of the scientific evidence on the brain tumor risk was made in May 2011 by the International Agency for Research on Cancer at World Health Organization...
May 15, 2017: Child Development
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