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Clinical electrophysiology

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https://www.readbyqxmd.com/read/28335032/allele-specific-ablation-rescues-electrophysiological-abnormalities-in-a-human-ips-cell-model-of-long-qt-syndrome-with-a-calm2-mutation
#1
Yuta Yamamoto, Takeru Makiyama, Takeshi Harita, Kenichi Sasaki, Yimin Wuriyanghai, Mamoru Hayano, Suguru Nishiuchi, Hirohiko Kohjitani, Sayako Hirose, Jiarong Chen, Fumika Yokoi, Taisuke Ishikawa, Seiko Ohno, Kazuhisa Chonabayashi, Hideki Motomura, Yoshinori Yoshida, Minoru Horie, Naomasa Makita, Takeshi Kimura
Background: Calmodulin is a ubiquitous Ca 2+ sensor molecule encoded by three distinct calmodulin genes, CALM1-3 . Recently, mutations in CALM1-3 have been reported to be associated with severe early-onset long-QT syndrome (LQTS). However, the underlying mechanism through which heterozygous calmodulin mutations lead to severe LQTS remains unknown, particularly in human cardiomyocytes. Objectives: We aimed to establish an LQTS disease model associated with a CALM2 mutation (LQT15) using human induced pluripotent stem cells (hiPSCs) and to assess mutant allele-specific ablation by genome editing for the treatment of LQT15...
March 1, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28334857/co-cultures-with-stem-cell-derived-human-sensory-neurons-reveal-regulators-of-peripheral-myelination
#2
Alex J Clark, Malte S Kaller, Jorge Galino, Hugh J Willison, Simon Rinaldi, David L H Bennett
Effective bidirectional signalling between axons and Schwann cells is essential for both the development and maintenance of peripheral nerve function. We have established conditions by which human induced pluripotent stem cell-derived sensory neurons can be cultured with rat Schwann cells, and have produced for the first time long-term and stable myelinating co-cultures with human neurons. These cultures contain the specialized domains formed by axonal interaction with myelinating Schwann cells, such as clustered voltage-gated sodium channels at the node of Ranvier and Shaker-type potassium channel (Kv1...
February 15, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28333338/drug-discovery-for-male-subfertility-using-high-throughput-screening-a-new-approach-to-an-unsolved-problem
#3
Sarah J Martins da Silva, Sean G Brown, Keith Sutton, Louise V King, Halil Ruso, David W Gray, Paul G Wyatt, Mark C Kelly, Christopher L R Barratt, Anthony G Hope
STUDY QUESTION: Can pharma drug discovery approaches be utilized to transform investigation into novel therapeutics for male infertility? SUMMARY ANSWER: High-throughput screening (HTS) is a viable approach to much-needed drug discovery for male factor infertility. WHAT IS KNOWN ALREADY: There is both huge demand and a genuine clinical need for new treatment options for infertile men. However, the time, effort and resources required for drug discovery are currently exorbitant, due to the unique challenges of the cellular, physical and functional properties of human spermatozoa and a lack of appropriate assay platform...
March 16, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28332703/predictors-of-meaningful-improvement-in-quality-of-life-after-temporal-lobe-epilepsy-surgery-a-prospective-study
#4
Carla Pauli, Marcelo Liborio Schwarzbold, Alexandre Paim Diaz, Maria Emilia Rodrigues de Oliveira Thais, Charles Kondageski, Marcelo Neves Linhares, Ricardo Guarnieri, Bianca de Lemos Zingano, Juliana Ben, Jean Costa Nunes, Hans Joachim Markowitsch, Peter Wolf, Samuel Wiebe, Katia Lin, Roger Walz
OBJECTIVES: To investigate prospectively the independent predictors of a minimum clinically important change (MCIC) in quality of life (QOL) after anterior temporal lobectomy (ATL) for drug-resistant mesial temporal lobe epilepsy related to hippocampal sclerosis (MTLE-HS) in Brazilian patients. METHODS: Multiple binary logistic regression analysis was performed to identify the clinical, demographic, radiologic, and electrophysiologic variables independently associated with MCIC in the Quality of Life in Epilepsy-31 Inventory (QOLIE-31) overall score 1 year after ATL in 77 consecutive patients with unilateral MTLE-HS...
March 23, 2017: Epilepsia
https://www.readbyqxmd.com/read/28332484/multivariate-regression-methods-for-estimating-velocity-of-ictal-discharges-from-human-microelectrode-recordings
#5
Jyun-You Liou, Elliot Smith, Lisa Bateman, Guy McKhann, Robert Goodman, Bradley Greger, Tyler Davis, Spencer Kellis, Paul House, Catherine Schevon
OBJECTIVE: Epileptiform discharges, an electrophysiological hallmark of seizures, can propagate across cortical tissue in a manner similar to traveling waves. Recent work has focused attention on the origination and propagation patterns of these discharges, yielding important clues to their source location and mechanism of travel. However, systematic studies of methods for measuring propagation are lacking. APPROACH: We analyzed epileptiform discharges in microelectrode array recordings of human seizures...
March 23, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28330959/predominantly-myalgic-phenotype-caused-by-the-c-3466g-a-p-a1156t-mutation-in-scn4a-gene
#6
Johanna Palmio, Satu Sandell, Michael G Hanna, Roope Männikkö, Sini Penttilä, Bjarne Udd
OBJECTIVE: To characterize the clinical phenotype in patients with p.A1156T sodium channel mutation. METHODS: Twenty-nine Finnish patients identified with the c.3466G>A p.A1156T mutation in the SCN4A gene were extensively examined. In a subsequent study, 63 patients with similar myalgic phenotype and with negative results in myotonic dystrophy type 2 genetic screening (DM2-neg group) and 93 patients diagnosed with fibromyalgia were screened for the mutation. Functional consequences of the p...
March 22, 2017: Neurology
https://www.readbyqxmd.com/read/28326027/accessible-neurobehavioral-anger-related-markers-for-vulnerability-to-post-traumatic-stress-symptoms-in-a-population-of-male-soldiers
#7
Tamar Lin, Gadi Gilam, Gal Raz, Ayelet Or-Borichev, Yair Bar-Haim, Eyal Fruchter, Talma Hendler
Identifying vulnerable individuals prone to develop post-traumatic stress symptoms (PTSS) is of paramount importance, especially in populations at high risk for stress exposure such as combat soldiers. While several neural and psychological risk factors are known, no post-traumatic stress disorder (PTSD) biomarker has yet progressed to clinical use. Here we present novel and clinically applicable anger-related neurobehavioral risk markers for military-related PTSS in a large cohort of Israeli soldiers. The psychological, electrophysiological and neural (Simultaneous recording of scalp electroencephalography [EEG] and functional magnetic resonance imaging [fMRI]) reaction to an anger-inducing film were measured prior to advanced military training and PTSS were recorded at 1-year follow-up...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28325009/a-clinic-compatible-open-source-electrophysiology-system
#8
John Hermiz, Nick Rogers, Erik Kaestner, Mehran Ganji, Dan Cleary, Joseph Snider, David Barba, Shadi Dayeh, Eric Halgren, Vikash Gilja
Open source electrophysiology (ephys) recording systems have several advantages over commercial systems such as customization and affordability enabling more researchers to conduct ephys experiments. Notable open source ephys systems include Open-Ephys, NeuroRighter and more recently Willow, all of which have high channel count (64+), scalability, and advanced software to develop on top of. However, little work has been done to build an open source ephys system that is clinic compatible, particularly in the operating room where acute human electrocorticography (ECoG) research is performed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324925/non-invasive-imaging-of-ventricular-activation-during-pacing-and-arrhythmia-methods-and-validation
#9
Long Yu, Steven Pogwizd, Bin He
Cardiovascular disease continued to be a leading killer world widely. Each year, about 400,000 cases of sudden cardiac arrest are reported in the U.S. alone. Clinically, radio-frequency ablative procedure has become widely applied in the treatment of ventricular arrhythmia. Non-invasive approaches have been demonstrated to be able to provide important information on the arrhythmogenesis and potentially assist in the clinical practice. In this work, we develop and validate a novel temporal sparse based imaging method, Cardiac Electrical Sparse Imaging (CESI)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28323720/neuroprognostication-after-cardiac-arrest-in-the-light-of-targeted-temperature-management
#10
Mauro Oddo, Hans Friberg
PURPOSE OF REVIEW: Delayed awakening after targeted temperature management (TTM) and sedation is frequent among cardiac arrest patients. Differentiating between prolonged coma and irreversible cerebral damage can be challenging, therefore the utilization of a multimodal approach is recommended by international guidelines. Here, we discuss indications and advantages/disadvantages of available modalities for coma prognostication and describe new tools to improve our accuracy for outcome prediction...
March 20, 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/28322742/potassium-channel-abnormalities-are-consistent-with-early-axon-degeneration-of-motor-axons-in-the-g127x-sod1-mouse-model-of-amyotrophic-lateral-sclerosis
#11
Rikke Maglemose, Anne Hedegaard, Janna Lehnhoff, Kristina Petrova Dimintiyanova, Mihai Moldovan, Lillian Grøndahl, Claire Francesca Meehan
Amyotrophic lateral sclerosis (ALS) is a lethal neurodegenerative disease, which selectively affects upper and lower motoneurones. The underlying pathophysiology of the disease is complex but electrophysiological studies of peripheral nerves in ALS patients as well as human autopsy studies indicate that a potassium channel dysfunction/loss is present early in the symptomatic phase. It remains unclear to what extent potassium channel abnormalities reflect a specific pathogenic mechanism in ALS. The aim of this study was therefore to investigate the temporal changes in the expression and/or function of potassium channels in motoneurones in the adult G127X SOD1 mouse model of ALS, a model which has a very long presymptomatic phase...
March 16, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28320840/k-channel-kv3-4-is-essential-for-axon-growth-by-limiting-the-influx-of-ca-2-into-growth-cones
#12
Chia-Yi Huang, Cheng-Chang Lien, Chau-Fu Cheng, Ting-Yun Yen, Chieh-Ju Chen, Meei-Ling Tsaur
Membrane excitability in the axonal growth cones of embryonic neurons influences axon growth. Voltage-gated K(+) (Kv) channels are key factors in controlling membrane excitability, but whether they regulate axon growth remains unclear. Here, we report that Kv3.4 is expressed in the axonal growth cones of embryonic spinal commissural neurons, motoneurons, dorsal root ganglion neurons, retinal ganglion cells and callosal projection neurons during axon growth. Our in vitro (cultured dorsal spinal neurons of chick embryos) and in vivo (developing chick spinal commissural axons and rat callosal axons) findings demonstrate that knockdown of Kv3...
March 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28320042/calcium-channel-modulation-as-a-target-in-chronic-pain-control
#13
REVIEW
Ryan Patel, Carlota Montagut-Bordas, Anthony H Dickenson
Neuropathic pain remains poorly treated for large numbers of patients and little progress has been made in developing novel classes of analgesics. To redress this issue, ziconotide (Prialt(TM) ) was developed and approved as a first in class synthetic version of ω-conotoxin MVIIA, a Cav 2.2 peptide blocker. Unfortunately, the impracticalities of intrathecal delivery, low therapeutic index and severe neurological side effects associated with ziconotide has restricted its use to exceptional circumstances. Ziconotide exhibits no state or use dependent block of Cav 2...
March 20, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28319880/the-importance-of-the-reproducibility-of-oropharyngeal-swallowing-in-amyotrophic-lateral-sclerosis-an-electrophysiological-study
#14
G Cosentino, E Alfonsi, L Mainardi, E Alvisi, F Brighina, F Valentino, B Fierro, G Sandrini, G Bertino, M Berlangieri, R De Icco, M Fresia, A Moglia
OBJECTIVE: To investigate electrophysiologically the reproducibility of oropharyngeal swallowing in patients with ALS. METHODS: We enrolled 26 ALS patients, both with and without clinical signs of dysphagia, and 30 age-matched controls. The reproducibility of the electrophysiological signals related to the oral phase (electromyographic activity of the submental/suprahyoid muscles) and the pharyngeal phase (laryngeal-pharyngeal mechanogram) of swallowing across repeated swallows was assessed...
February 20, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28315374/glp-1-analogue-cjc-1131-prevents-amyloid-%C3%AE-protein-induced-impirments-of-spatial-memory-and-synaptic-plasticity-in-rats
#15
Sheng-Xiao Zhang, Hong-Yan Cai, Xiao-Wen Ma, Li Yuan, Jun Zhang, Zhao-Jun Wang, Yu-Feng Li, Jin-Shun Qi
Although amyloid β protein (Aβ) has been recognized as one of the main pathological characteristics in the brain of Alzheimer's disease (AD), the effective strategies against Aβ neurotoxicity are still deficient up to now. Glucagon-like peptide 1 (GLP-1), a natural gut hormone, was found to be effective in modulating insulin signaling and neural protection, but short half-life limited its clinical application in AD treatment. CJC-1131, a newly designed GLP-1 analogue with very longer half-life, has shown good effectiveness in the treatment of type 2 diabetes mellitus (T2DM)...
March 14, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28314521/orienting-reaction-may-help-recognition-of-patients-with-psychogenic-nonepileptic-seizures
#16
Murat Yalçın, Evrim Tellioğlu, Ayşegül Gündüz, Mine Özmen, Naz Yeni, Çiğdem Özkara, Meral E Kiziltan
OBJECTIVE: Psychogenic nonepileptic seizures (PNES) are abrupt, paroxysmal changes in behavior or consciousness that may phenomenologically resemble epileptic seizures. Given the known association between anxiety and PNES, we hypothesized that in these subjects there may be evidence that the nervous system is hypersensitive to external stimuli. We aimed to test our hypothesis by means of the auditory startle reaction (ASR). By investigating ASR, we also had the opportunity to test presence of orienting reaction, which is generally defined as the second phase of response after the auditory stimulus, with longer latency...
March 14, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/28306698/oral-application-of-magnesium-l-threonate-attenuates-vincristine-induced-allodynia-and-hyperalgesia-by-normalization-of-tumor-necrosis-factor-%C3%AE-nuclear-factor-%C3%AE%C2%BAb-signaling
#17
Ting Xu, Dai Li, Xin Zhou, Han-Dong Ouyang, Li-Jun Zhou, Hang Zhou, Hong-Mei Zhang, Xu-Hong Wei, Guosong Liu, Xian-Guo Liu
BACKGROUND: Antineoplastic agents, including vincristine, often induce neuropathic pain and magnesium deficiency clinically, but the causal link between them has not been determined. No drug is available for treating this form of neuropathic pain. METHODS: Injection of vincristine (0.1 mg · kg · day, intraperitoneally, for 10 days) was used to induce nociceptive sensitization, which was accessed with von Frey hairs and the plantar tester in adult male Sprague-Dawley rats...
March 17, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28306348/differences-in-dyslexic-students-before-and-after-a-remediation-program-a-clinical-neuropsychological-and-event-related-potential-study
#18
Nikolaos C Zygouris, Elias Avramidis, Argyris V Karapetsas, George I Stamoulis
Developmental dyslexia is defined as an unexpected specific and persistent failure to acquire efficient reading skills despite conventional instruction, adequate intelligence and sociocultural opportunity. This article reports the outcomes of a study that evaluated the implementation of a 4-month intervention program. The intervention consisted of structured activities aiming at improving (a) the children's phonological awareness, (b) their visual and auditory memory, (c) their visual discrimination ability, and (d) their text comprehension...
March 17, 2017: Applied Neuropsychology. Child
https://www.readbyqxmd.com/read/28302453/brain-rhythm-attractor-breakdown-in-alzheimer-s-disease-functional-and-pathologic-implications
#19
Elissaios Karageorgiou, Keith A Vossel
This perspective binds emerging evidence on the bidirectional relationship between Alzheimer's disease (AD) and sleep disorders through a model of brain rhythm attractor breakdown. This approach explains behavioral-cognitive changes in AD across the sleep-wake cycle and supports a causal association between early brainstem tau pathology and subsequent cortical amyloid-β accumulation. Specifically, early tau dysregulation within brainstem-hypothalamic nuclei leads to breakdown of sleep-wake attractor networks, with patients displaying an attenuated range of behavioral and electrophysiological activity patterns, a "twilight zone" of constant activity between deep rest and full alertness...
March 13, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28299455/use-of-palmitoylethanolamide-in-carpal-tunnel-syndrome-a-prospective-randomized-study
#20
Jordi Faig-Martí, Adriana Martínez-Catassús
BACKGROUND: Palmitoylethanolamide (PEA) is an endogenous fatty acid amide that has shown anti-inflammatory activity and neuroprotection and has been used for the treatment of compressive syndromes. The aim of this study is to investigate the clinical and electrophysiological effects of conservative treatment with PEA in low to moderate carpal tunnel syndrome (CTS). MATERIALS AND METHODS: A prospective double-blinded randomized study was performed on 61 patients with a clinical and electrophysiologically confirmed diagnosis of low and moderate CTS...
March 15, 2017: Journal of Orthopaedics and Traumatology: Official Journal of the Italian Society of Orthopaedics and Traumatology
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