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https://www.readbyqxmd.com/read/29474906/a-hematogenous-route-for-medulloblastoma-leptomeningeal-metastases
#1
Livia Garzia, Noriyuki Kijima, A Sorana Morrissy, Pasqualino De Antonellis, Ana Guerreiro-Stucklin, Borja L Holgado, Xiaochong Wu, Xin Wang, Michael Parsons, Kory Zayne, Alex Manno, Claudia Kuzan-Fischer, Carolina Nor, Laura K Donovan, Jessica Liu, Lei Qin, Alexandra Garancher, Kun-Wei Liu, Sheila Mansouri, Betty Luu, Yuan Yao Thompson, Vijay Ramaswamy, John Peacock, Hamza Farooq, Patryk Skowron, David J H Shih, Angela Li, Sherine Ensan, Clinton S Robbins, Myron Cybulsky, Siddhartha Mitra, Yussanne Ma, Richard Moore, Andy Mungall, Yoon-Jae Cho, William A Weiss, Jennifer A Chan, Cynthia E Hawkins, Maura Massimino, Nada Jabado, Michal Zapotocky, David Sumerauer, Eric Bouffet, Peter Dirks, Uri Tabori, Poul H B Sorensen, Priscilla K Brastianos, Kenneth Aldape, Steven J M Jones, Marco A Marra, James R Woodgett, Robert J Wechsler-Reya, Daniel W Fults, Michael D Taylor
While the preponderance of morbidity and mortality in medulloblastoma patients are due to metastatic disease, most research focuses on the primary tumor due to a dearth of metastatic tissue samples and model systems. Medulloblastoma metastases are found almost exclusively on the leptomeningeal surface of the brain and spinal cord; dissemination is therefore thought to occur through shedding of primary tumor cells into the cerebrospinal fluid followed by distal re-implantation on the leptomeninges. We present evidence for medulloblastoma circulating tumor cells (CTCs) in therapy-naive patients and demonstrate in vivo, through flank xenografting and parabiosis, that medulloblastoma CTCs can spread through the blood to the leptomeningeal space to form leptomeningeal metastases...
February 22, 2018: Cell
https://www.readbyqxmd.com/read/29473493/current-limitations-in-the-treatment-parkinson-s-and-alzheimer-s-diseases-state-of-the-art-and-future-perspective-of-polymeric-carriers
#2
Chiara Tonda-Turo, Nicola Origlia, Clara Mattu, Alice Accorroni, Valeria Chiono
Alzheimer's and Parkinson's disease are the most common neurodegenerative diseases worldwide and their incidence is increasing due to the aging population. At the moment, the available therapies are not disease modifying and have several limitations, some of which are discussed in this review. One of the main limitations of these treatments is the low concentration that drugs reach in the central nervous system after systemic administration. Indeed, the presence of biological barriers, particularly the blood brain barrier (BBB), hinders the effective drug delivery to the brain, reducing the potential benefit coming from the administration of the medication...
February 21, 2018: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/29471782/transcapillary-fluid-flux-and-inflammatory-response-during-neonatal-therapeutic-hypothermia-an-open-longitudinal-observational-study
#3
Hans Jørgen Timm Guthe, Torbjørn Nedrebø, Jan Kristian Damås, Helge Wiig, Ansgar Berg
BACKGROUND: Therapeutic hypothermia is neuroprotective in asphyxiated neonates by counteracting mechanisms contributing to brain injury. Although an initial increased permeability is part of an inflammatory reaction and thereby a natural healing process, an excessive endothelial permeability with edema formation may result in impaired hemodynamics. Reduced permeability may, however, benefit healing. Although plasma and interstitial colloid osmotic pressure are accessible and essential parameters for understanding fluid imbalance, the mechanisms of fluid exchange remain poorly understood...
February 23, 2018: BMC Pediatrics
https://www.readbyqxmd.com/read/29467602/feature-selection-methods-for-robust-decoding-of-finger-movements-in-a-non-human-primate
#4
Subash Padmanaban, Justin Baker, Bradley Greger
Objective: The performance of machine learning algorithms used for neural decoding of dexterous tasks may be impeded due to problems arising when dealing with high-dimensional data. The objective of feature selection algorithms is to choose a near-optimal subset of features from the original feature space to improve the performance of the decoding algorithm. The aim of our study was to compare the effects of four feature selection techniques, Wilcoxon signed-rank test, Relative Importance, Principal Component Analysis (PCA), and Mutual Information Maximization on SVM classification performance for a dexterous decoding task...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29462643/pirouetting-pigs-a-large-non-primate-animal-model-based-on-unilateral-6-hydroxydopamine-lesioning-of-the-nigrostriatal-pathway
#5
Anette Bro Christensen, Jens Christian Hedemann Sørensen, Kåre Schmidt Ettrup, Dariusz Orlowski, Carsten Reidies Bjarkam
INTRODUCTION: The rotating 6-hydroxydopamine (6-OHDA) rat model has long been important when developing new treatment strategies for Parkinson's disease (PD). Similar non-human primate models have been developed for translational research purposes as large animal models are required by regulatory bodies as an intermediate "phase 0" trial step. However, experimental research in non-human primates encounters several economical and regulatory issues, which may be avoided by the alternative use of pigs as a large animal model for experimental brain research...
February 17, 2018: Brain Research Bulletin
https://www.readbyqxmd.com/read/29462410/changes-in-brain-derived-neurotrophic-factor-expression-influence-sleep-wake-activity-and-homeostatic-regulation-of-rapid-eye-movement-sleep
#6
Jennifer M Garner, Jonathan Chambers, Abigail K Barnes, Subimal Datta
Study Objectives: Brain-derived neurotrophic factor (BDNF) expression and homeostatic regulation of rapid eye movement (REM) sleep are critical for neurogenesis and behavioral plasticity. Accumulating clinical and experimental evidence suggests that decreased BDNF expression is causally linked with the development of REM sleep-associated neuropsychiatric disorders. Therefore, we hypothesize that BDNF plays a role in sleep-wake (S-W) activity and homeostatic regulation of REM sleep. Methods: Male and female wild-type (WT; BDNF +/+) and heterozygous BDNF (KD; BDNF +/-) rats were chronically implanted with S-W recording electrodes to quantify baseline S-W activity and REM sleep homeostatic regulatory processes during the light phase...
November 20, 2017: Sleep
https://www.readbyqxmd.com/read/29455370/incomplete-copolymer-degradation-of-in-situ-chemotherapy
#7
Pierre Bourdillon, Tanguy Boissenot, Lauriane Goldwirt, Julien Nicolas, Caroline Apra, Alexandre Carpentier
In situ carmustine wafers containing 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) are commonly used for the treatment of recurrent glioblastoma to overcome the brain-blood barrier. In theory, this chemotherapy diffuses into the adjacent parenchyma and the excipient degrades in maximum 8 weeks but no clinical data confirms this evolution, because patients are rarely operated again. A 75-year-old patient was operated twice for recurrent glioblastoma, and a carmustine wafer was implanted during the second surgery...
February 17, 2018: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29454121/complications-of-impulse-generator-exchange-surgery-for-deep-brain-stimulation-a-single-centre-retrospective-study
#8
Ann-Kristin Helmers, Isabel Lübbing, Falk Birkenfeld, Karsten Witt, Michael Synowitz, Hubertus Maximilian Mehdorn, Daniela Falk
OBJECTIVE: Non-rechargeable deep brain stimulation (DBS) impulse generators (IG) with a low or empty battery status require surgical IG exchange several years after initial implantation. Complication rates in patients undergoing DBS surgery range from 7.6% to 25.3%. The aim of this study was to investigate the complication rates after IG exchange surgery and to identify risk factors for complications. METHODS: We retrospectively analysed complications following IG exchange surgery from 2008 to 2015 in a single-centre university hospital setting...
February 14, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29451447/peripheral-nerve-grafts-implanted-into-the-substantia-nigra-in-patients-with-parkinson-s-disease-during-deep-brain-stimulation-surgery-1-year-follow-up-study-of-safety-feasibility-and-clinical-outcome
#9
Craig G van Horne, Jorge E Quintero, John T Slevin, Amelia Anderson-Mooney, Julie A Gurwell, Andrew S Welleford, John R Lamm, Renee P Wagner, Greg A Gerhardt
OBJECTIVE Currently, there is no treatment that slows or halts the progression of Parkinson's disease. Delivery of various neurotrophic factors to restore dopaminergic function has become a focus of study in an effort to fill this unmet need for patients with Parkinson's disease. Schwann cells provide a readily available source of such factors. This study presents a 12-month evaluation of safety and feasibility, as well as the clinical response, of implanting autologous peripheral nerve grafts into the substantia nigra of patients with Parkinson's disease at the time of deep brain stimulation (DBS) surgery...
February 16, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29450404/reengineering-deep-brain-stimulation-for-movement-disorders-emerging-technologies
#10
Aysegul Gunduz, Kelly D Foote, Michael S Okun
Deep brain stimulation (DBS) is a neurosurgical technique, which consists of continuous delivery of an electrical pulse through chronically implanted electrodes connected to a neurostimulator, programmable in amplitude, pulse width, frequency, and stimulation channel. DBS is a promising treatment option for addressing severe and drug-resistant movement disorders. The success of DBS therapy is a combination of surgical implantation techniques, device technology, and clinical programming strategies. Changes in device settings require highly trained and experienced clinicians to achieve maximal therapeutic benefit for each targeted symptom, and optimization of stimulation parameters can take many visits...
December 2017: Current Opinion in Biomedical Engineering
https://www.readbyqxmd.com/read/29448149/characterization-of-the-stimulus-waveforms-generated-by-implantable-pulse-generators-for-deep-brain-stimulation
#11
Scott F Lempka, Bryan Howell, Kabilar Gunalan, Andre G Machado, Cameron C McIntyre
OBJECTIVE: To determine the circuit elements required to theoretically describe the stimulus waveforms generated by an implantable pulse generator (IPG) during clinical deep brain stimulation (DBS). METHODS: We experimentally interrogated the Medtronic Activa PC DBS IPG and defined an equivalent circuit model that accurately captured the output of the IPG. We then compared the detailed circuit model of the clinical stimulus waveforms to simplified representations commonly used in computational models of DBS...
January 31, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29447794/plasticity-after-pediatric-cochlear-implantation-implication-from-changes-in-peripheral-plasma-level-of-bdnf-and-auditory-nerve-responses
#12
Razieh Alemi, Masoud Motassadi Zarandy, Mohammad Taghi Joghataei, Ali Eftekharian, Mohammad Reza Zarrindast, Nasim Vousooghi
INTRODUCTION: Sensory neural hearing loss could lead to some structural and physiological changes in the auditory pathways, such as alteration in the expression of neurotrophins. These factors, especially Brain-Derived Neurotrophic Factor (BDNF), play an important role in synaptic functions and experience-related plasticity. Restoring cochlear function after hearing loss is possible through cochlear implantation (CI). Evaluation of the blood concentration changes of neurotrophins as prerequisites of plasticity could help scientists to determine the prognosis of CI as in the candidacy procedure or enhancing prosthesis function by adding the exact needed amount of BDNF to the electrode array...
February 2018: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29447771/topographical-distribution-of-perioperative-cerebral-infarction-associated-with-transcatheter-aortic-valve-implantation
#13
Jonathon P Fanning, Allan J Wesley, Darren L Walters, Andrew A Wong, Adrian G Barnett, Wendy E Strugnell, David G Platts, John F Fraser
BACKGROUND: Transcatheter aortic valve implantation (TAVI) is associated with a high incidence of cerebrovascular injury. As these injuries are thought to be primarily embolic, neuroprotection strategies have focused on embolic protection devices. However, the topographical distribution of cerebral emboli and how this impacts on the effectiveness of these devices have not been thoroughly assessed. Here, we evaluated the anatomical characteristics of magnetic resonance imaging (MRI)-defined cerebral ischemic lesions occurring secondary to TAVI to enhance our understanding of the distribution of cardioembolic phenomena...
March 2018: American Heart Journal
https://www.readbyqxmd.com/read/29445057/utility-of-fluid-assessment-based-on-the-intrathoracic-impedance-monitoring-in-a-peripartum-woman-with-heart-disease
#14
Atsushi Daimon, Chizuko A Kamiya, Masami Sawada, Yusuke Ueda, Chinami Horiuchi, Takekazu Miyoshi, Mitsuhiro Tsuritani, Naoko Iwanaga, Reiko Neki, Hideo Okamura, Shingo Kusano, Jun Yoshimatsu
Recently, implantable cardioverter-defibrillators (ICD) have become capable of monitoring intrathoracic impedance to detect an increased fluid volume and heart failure. Pregnancy is a well-known cause of an increased body fluid volume; however, it is not clear whether the measurement of intrathoracic impedance by ICD is clinically useful for precisely detecting heart failure in pregnant women. We herein report the case of a 39-year-old woman with an ICD that had been implanted after an event of ventricular fibrillation due to severe aortic regurgitation with a bicuspid aortic valve...
February 14, 2018: International Heart Journal
https://www.readbyqxmd.com/read/29444303/the-utility-of-vancomycin-powder-in-reducing-surgical-site-infections-in-deep-brain-stimulation-surgery
#15
Ryan B Kochanski, Pouya Nazari, Sepehr Sani
BACKGROUND: The impact of vancomycin powder on reducing postoperative surgical site infections (SSIs) in spine surgery has been studied extensively and is considered standard of care at many institutions. More recently, vancomycin powder has been shown to reduce SSI in cranial neurosurgery; however, limited studies have been performed assessing its impact in reducing SSIs in deep brain stimulation (DBS) surgery. OBJECTIVE: To investigate the use of vancomycin powder as an adjunct to the current antibiotic prophylaxis regimen in DBS surgery in a large cohort of patients...
February 10, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29443088/simultaneous-video-eeg-ecg-monitoring-to-identify-neurocardiac-dysfunction-in-mouse-models-of-epilepsy
#16
Vikas Mishra, Nicole M Gautier, Edward Glasscock
In epilepsy, seizures can evoke cardiac rhythm disturbances such as heart rate changes, conduction blocks, asystoles, and arrhythmias, which can potentially increase risk of sudden unexpected death in epilepsy (SUDEP). Electroencephalography (EEG) and electrocardiography (ECG) are widely used clinical diagnostic tools to monitor for abnormal brain and cardiac rhythms in patients. Here, a technique to simultaneously record video, EEG, and ECG in mice to measure behavior, brain, and cardiac activities, respectively, is described...
January 29, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29432110/the-cochlear-implant-eeg-artifact-recorded-from-an-artificial-brain-for-complex-acoustic-stimuli
#17
Luise Wagner, Natasha Maurits, Bert Maat, Deniz Baskent, Anita E Wagner
Electroencephalographic (EEG) recordings provide objective estimates of listeners' cortical processing of sounds and of the status of their speech perception system. For profoundly deaf listeners with cochlear implants (CIs), the applications of EEG are limited because the device adds electric artifacts to the recordings. This restricts the possibilities for the neural-based metrics of speech processing by CI users, for instance to gauge cortical reorganization due to individual's hearing loss history. This paper describes the characteristics of the CI artifact as recorded with an artificial head substitute, and reports how the artifact is affected by the properties of the acoustical input signal versus the settings of the device...
February 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29430147/prosthetic-rehabilitation-in-neurosurgical-cranioplasty
#18
Thara Maria Joseph, R Ravichandran, K Harshakumar, S Lylajam
The defects of the skull cause mechanical vulnerability of the brain, esthetic disfigurement, and transmission of vibrations and pulsation of the brain. Subsequent cranioplasty may be required to compensate for the defect and to alleviate various signs and symptoms. When long-term outcome of biomaterial use in pediatric cases is limited, alloplastic cranioplasty in adults are supported by several large case series. This case report narrates cranioplasty using titanium alloplastic implant material.
January 2018: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/29428214/the-effects-of-bilateral-continuous-and-chronic-deep-brain-stimulation-of-the-medial-forebrain-bundle-in-a-rodent-model-of-depression
#19
Stephanie Thiele, Luciano Furlanetti, Lisa-Marie Pfeiffer, Volker A Coenen, Máté D Döbrössy
BACKGROUND: Clinical trials of supra-lateral medial forebrain bundle (MFB) Deep Brain Stimulation (DBS) in treatment resistant major depressive patients have shown rapid and long-term benefits. OBJECTIVE/HYPOTHESIS: The study used Flinders Sensitive Line (FSL) rats with previously identified depressive-like phenotype to assess the range of behavior modification achieved by MFB DBS. METHODS: Male FSL and wild-type Sprague-Dawley rats as Controls were tested on mood/anxiety/exploration, cognitive and motor behaviors...
February 8, 2018: Experimental Neurology
https://www.readbyqxmd.com/read/29427240/bilateral-deep-brain-stimulation-of-the-subthalamic-nucleus-increases-pointing-error-during-memory-guided-sequential-reaching
#20
Fabian J David, Lisa C Goelz, Ruth Z Tangonan, Leonard Verhagen Metman, Daniel M Corcos
Deep brain stimulation of the subthalamic nucleus (STN DBS) significantly improves clinical motor symptoms, as well as intensive aspects of movement like velocity and amplitude in patients with Parkinson's disease (PD). However, the effects of bilateral STN DBS on integrative and coordinative aspects of motor control are equivocal. The aim of this study was to investigate the effects of bilateral STN DBS on integrative and coordinative aspects of movement using a memory-guided sequential reaching task. The primary outcomes were eye and finger velocity and end-point error...
February 9, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
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