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Eletrophysiology

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https://www.readbyqxmd.com/read/25859868/abnormal-heart-rate-variability-and-atrial-fibrillation-after-aortic-surgery
#1
Leonida Compostella, Nicola Russo, Augusto D'Onofrio, Tiziana Setzu, Caterina Compostella, Tomaso Bottio, Gino Gerosa, Fabio Bellotto
INTRODUCTION: Complete denervation of transplanted heart exerts protective effect against postoperative atrial fibrillation; various degrees of autonomic denervation appear also after transection of ascending aorta during surgery for aortic aneurysm. OBJECTIVE: This study aimed to evaluate if the level of cardiac denervation obtained by resection of ascending aorta could exert any effect on postoperative atrial fibrillation incidence. METHODS: We retrospectively analysed the clinical records of 67 patients submitted to graft replacement of ascending aorta (group A) and 132 with aortic valve replacement (group B); all episodes of postoperative atrial fibrillation occurred during the 1-month follow-up have been reported...
January 2015: Revista Brasileira de Cirurgia Cardiovascular
https://www.readbyqxmd.com/read/25675308/diagnostic-tests-for-concussion-is-vision-part-of-the-puzzle
#2
REVIEW
Rachel E Ventura, Jeffrey M Jancuska, Laura J Balcer, Steven L Galetta
BACKGROUND: Concussion, particularly in relation to sports and combat activities, is increasingly recognized as a potential cause of both short- and long-term neurologic sequelae. This review will focus on the neuro-ophthalmologic findings associated with concussion, the current tests for concussion, and the potential for visual performance measures to improve our detection and assessment of concussions. EVIDENCE ACQUISITION: A PubMed search using the specific key words "concussion," "mild traumatic brain injury," "neuro-ophthalmological findings," and "diagnostic and management tests" was performed...
March 2015: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/23058173/tms-by-double-cone-coil-prefrontal-stimulation-for-medication-resistant-chronic-depression-a-case-report
#3
Sven Vanneste, Jan Ost, Berthold Langguth, Dirk De Ridder
A double-cone coil with large angled windings has been developed to modulate deeper brain areas such as the anterior cingulate cortex (ACC). Abnormal resting state activity in the pregenual ACC (pgACC), dorsal ACC (dACC) and subgenual ACC (sgACC) has been observed in depression. A patient with medication resistant chronic depression received ten sessions of transcranial magnetic stimulation (TMS) (10 Hz, 2000 stimuli/session) using a double-cone coil placed over the supplementary motor area, targeting the anterior cingulate...
2014: Neurocase
https://www.readbyqxmd.com/read/22001455/transient-myoclonic-state-with-asterixis-primary-motor-cortex-hyperexcitability-is-correlated-with-myoclonus
#4
Takefumi Hitomi, Akio Ikeda, Morito Inouchi, Hisaji Imamura, Tomokazu Nakagawa, Tomoyuki Fumuro, Riki Matsumoto, Ryosuke Takahashi
OBJECTIVE: To clarify the clinical features and mechanism of the transience of myoclonus in patients with a transient myoclonic state with asterixis (TMA). METHODS: We investigated the clinical and eletrophysiological profiles of 6 patients with TMA (age: 84±3 years). During an asymptomatic period, somatosensory evoked potentials (SEPs) were recorded in all 6 patients and motor evoked potentials (MEPs) were examined in 1 patient. SEPs were recorded and jerk-locked back averaging (JLA) was performed in 2 patients while symptomatic...
2011: Internal Medicine
https://www.readbyqxmd.com/read/20305879/eletrophysiological-study-of-the-caudal-nerve-on-developing-rats
#5
Juliana Netto Maia, Celina Cordeiro de Carvalho, Marina Hazin Galvão, Anderson de Lima Silva, Ana Carine Gouveia Mendes, Sílvia Regina Arruda de Moraes, Otávio Gomes Lins
PURPOSE: To non-invasively study the sensory nerve conduction of the caudal nerve of normal developing rats. METHODS: Twenty normal Wistar male rats served as subjects. Caudal nerve conduction studies were performed at 60 days from birth and weekly at end of six consecutive weeks. The caudal nerve was stimulated distally and nerve potentials were recorded proximally on the animal's tail using common 'alligator' clips as surface electrodes. RESULTS: The amplitude and the conduction velocity of the caudal nerve sensory action potential increased linearly from 29+/-6 microV to 85+/-13 microV and from 34+/-3 m/s to 44+/-4 m/s, respectively, between the 8th and the 15th week of life...
April 2010: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/19812320/synaptic-circuit-abnormalities-of-motor-frontal-layer-2-3-pyramidal-neurons-in-an-rna-interference-model-of-methyl-cpg-binding-protein-2-deficiency
#6
Lydia Wood, Noah W Gray, Zhaolan Zhou, Michael E Greenberg, Gordon M G Shepherd
Rett syndrome, an autism spectrum disorder with prominent motor and cognitive features, results from mutations in the gene for methyl-CpG-binding protein 2 (MeCP2). Here, to identify cortical circuit abnormalities that are specifically associated with MeCP2 deficiency, we used glutamate uncaging and laser scanning photostimulation to survey intracortical networks in mouse brain slices containing motor-frontal cortex. We used in utero transfection of short hairpin RNA constructs to knock down MeCP2 expression in a sparsely distributed subset of layer (L) 2/3 pyramidal neurons in wild-type mice, and compared input maps recorded from transfected-untransfected pairs of neighboring neurons...
October 7, 2009: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/19629317/eletrophysiological-auditory-evaluation-in-stutterers-pre-and-post-treatment
#7
COMPARATIVE STUDY
Rosanna Mariangela Giaffredo Angrisani, Carla Gentile Matas, Ivone Ferreira Neves, Fernanda Chiarion Sassi, Claudia Regina Furquim de Andrade
BACKGROUND: stuttering is a speech fluency disorder. Auditory evoked potentials (AEP) are electrophysiological tests that are being used as an instrument to establish the diagnosis of several disorders as well as to assess therapeutic outcomes. AIM: 1 - to characterize the AEP of individuals with stuttering in comparison to a control group; 2 - to verify the amelioration of these potentials post speech-language treatment. METHOD: the research sample was composed by 8 adult males with stuttering - research group (RG), with ages ranging from 18 to 30 years, and 8 normally fluent adult males - control group (CG), within the same age range...
April 2009: Pró-fono: Revista de Atualização Científica
https://www.readbyqxmd.com/read/19370546/phoneutria-spider-toxins-block-ischemia-induced-glutamate-release-neuronal-death-and-loss-of-neurotransmission-in-hippocampus
#8
Ana Cristina do Nascimento Pinheiro, Adriano Jesus da Silva, Marco Antonio M Prado, Marta do Nascimento Cordeiro, Michael Richardson, Monalise Costa Batista, Célio José de Castro Junior, André Ricardo Massensini, Cristina Guatimosim, Marco A Romano-Silva, Christopher Kushmerick, Marcus Vinicius Gomez
The aim of this study was to investigate the effect of spider toxins on brain injury induced by oxygen deprivation and low glucose (ODLG) insult on slices of rat hippocampus. After ODLG insult cell viabilility in hippocampal slices was assessed by confocal microscopy and epifluorescence using the live/dead kit containing calcein-AM and ethidium homodimer and CA1 population spike amplitude recording during stimulation of Schaffer collateral fibers. Spider toxins Tx3-3 or Tx3-4 and conus toxins, omega-conotoxin GVIA or omega-conotoxin MVIIC are calcium channel blockers and protected against neuronal damage in slices subjected to ODLG insult...
November 2009: Hippocampus
https://www.readbyqxmd.com/read/17533129/musk-antibody-positive-myasthenia-gravis-presenting-with-isolated-neck-extensor-weakness
#9
C Casasnovas, M Povedano, S Jaumà, J Montero, J A Martínez-Matos
Dropped head sign is characterized by the gradual forward sagging of the head due to weakness of neck extensor muscles. This may be a prominent sign of several neuromuscular disorders and may be an isolated feature of myasthenia gravis (MG). We describe a patient with isolated neck extensor weakness, eletrophysiological findings suggesting myasthenia gravis and positive MuSK antibodies. This case supports that finding anti-MuSK antibodies may be extremely helpful in dropped head patients and negative acetylcholine receptor antibodies especially if needle EMG does not reveal myopathic or neurogenic patterns...
July 2007: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/16786102/effect-of-adrenomedullin-on-the-activity-of-barosensitive-neurons-in-the-rostral-ventrolateral-medulla-of-rats
#10
Ming-Xin Fan, Xia Li, Jin Wang, Yin-Xiang Cao, Lin-Lin Shen, Da-Nian Zhu
To investigate the eletrophysiological effect of rat adrenomedullin (rADM) on barosensitive neurons in the rostral ventrolateral medulla (rVLM) and its potential mechanisms, the extracellular recording and multi-barrel iontophoresis methods were used. Of the 29 barosensitive neurons in the rVLM, 20 neurons demonstrated excitatory response to iontophoretically applied rADM and increased the firing rate from (10.8 +/- 2.7) spikes/s to (14.6 +/- 3.6), (19.8 +/- 4.7) and (31.9 +/- 6.4) spikes/s (P<0.05, n=20) at the current of 30, 60 and 90 nA, respectively...
June 25, 2006: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/16248210/role-of-pgl-i-antibody-detection-in-the-diagnosis-of-pure-neural-leprosy
#11
Marcia R Jardim, Sergio L G Antunes, Brian Simons, Joanne G Wildenbeest, José Augusto C Nery, Ximena Illarramendi, Milton O Moraes, Alejandra N Martinez, Linda Oskam, William R Faber, Euzenir N Sarno, Elizabeth P Sampaio, Samira Bührer-Sékula
Pure neural leprosy (PNL) is difficult to diagnose because skin lesions and acid-fast bacilli (AFB) in slit smears are absent. At present, the gold standard for PNL diagnosis is the histopathological examination of a peripheral nerve biopsy. Even so, detection of bacteria is difficult and histological findings may be non-specific. Furthermore, nerve biopsy is an invasive procedure that is only possible in specialized centres. Therefore, there is a need for additional diagnostic methods that may help to confirm the clinical diagnosis of PNL...
September 2005: Leprosy Review
https://www.readbyqxmd.com/read/15988917/-somnambulism-clinical-and-eletrophysiological-aspects
#12
REVIEW
Anna Szúcs, Péter Halász
The authors review the literature on the epidemiology, the clinical and electrophysiological symptoms of somnambulism. The disorder specified as "nREM parasomnia with awakening disorder" belongs to the nREM sleep (awakening) parasomnias. In most of the cases its occurence is familial with the highest prevalence at age 12 year. Above age 12 year most cases recover whereas 6% of prevalence is reported in adults. It is probable that most patients seek medical help only in severe cases associated with injuries, accidents or violence...
June 5, 2005: Orvosi Hetilap
https://www.readbyqxmd.com/read/15705544/simultaneous-recording-of-breathing-and-respiratory-related-neuronal-activity-in-the-brainstem-of-conscious-rats
#13
COMPARATIVE STUDY
Franck P Martial, Mark Dunleavy, Philip Nolan, Walter T McNicholas, Ronan G O'Regan, Aidan Bradford
One aim of integrative neurophysiology is to understand the relationship between neuronal activity and normal evolution of other physiological parameters. In this respect, anaesthetics or paralyzing agents, that have been shown to have a significant effect on several vital physiological processes, can be seen as a real problem for the interpretation of observations. Eletrophysiological recording in awake animals avoids this problem. Recordings in forebrain areas are now used routinely but a number of specific difficulties have limited their application to the medullary areas...
February 15, 2005: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/15159898/-effect-of-anhydrous-glycerol-injection-into-the-mental-foramen-of-rabbit-on-inferior-nerve-an-experimental-study
#14
Y S Wang, Y J Dong, Q Q Su
In this experiment anhydrous glycerol was injected into the mental foramen of rabbits to determine neurolytic effects on the peripheral trigeminal nerve by electrohysiologic and morphologic methods.The rabbits underwent unilateral injection of anhydrous glycerol and the control side was injected with normal saline.The results show that partial fibers are effected (myelinated and unmyelinated fibers at random).Glycerol injection increased the average latencies and reduced the average amplitudes of compound action potentials...
December 1992: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/14992008/-anterior-cingulate-cortex-and-processing-of-pain
#15
REVIEW
Yong-Jing Gao, Yu-Qiu Zhang, Zhi-Qi Zhao
Anterior cingulate cortex (ACC), an important part of the limbic system, has extensive connections with other cortical areas and subcortical nuclei and is involved in modulating many functions. In recent years, an increasing body of evidence in eletrophysiology, functional imaging and behavioral study indicates that ACC is closely involved in processing of pain, especially in the affective dimension of pain. This review will focus on the progress in the study of ACC in processing of pain.
October 2003: Sheng Li Ke Xue Jin Zhan [Progress in Physiology]
https://www.readbyqxmd.com/read/12691789/flunitrazepam-induced-changes-in-neurophysiological-behavioural-and-subjective-measures-used-to-assess-sedation
#16
RANDOMIZED CONTROLLED TRIAL
Lígia M Lucchesi, Sabine Pompéia, Gilberto M Manzano, André F Kohn, José C F Galduroz, Orlando F A Bueno, Sérgio Tufik
INTRODUCTION: Certain features of event-related potentials (ERPs), electroencephalographic (EEG), and behavioural measures vary with differing states of alertness and/or sedation. PURPOSE: This study was conducted to investigate changes in several measures usually viewed as reflecting states of sedation/sleepiness associated with the use of a range of doses of the hypnotic benzodiazepine (BZD) flunitrazepam (FNZ). METHODS: This was a double blind, independent group design study of the effects of acute oral doses of FNZ in young healthy volunteers...
May 2003: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/10863416/the-influence-of-exogenous-nerve-growth-factor-on-inferior-alveolar-nerve-regeneration-in-silicone-tubes
#17
S S Bu, J R Li, C Z Hu, Y F Zhao
OBJECTIVE: To explore the effects of exogenous nerve growth factor (NGF) in the regeneration of adult white rabbit inferior alveolar nerves within silicone tubes. METHODS: Twenty-four adult white rabbits were selected. Bilateral 8 mm inferior alveolar nerve gaps were created, and the proximal and distal stumps were inserted into a 12 mm silicone tube. The right side silicone tube was filled with exogenous NGF (experimental group) and the contralateral side was filled with saline (control group)...
December 1999: Chinese Journal of Dental Research
https://www.readbyqxmd.com/read/10450360/seizures-in-ch%C3%A3-diak-higashi-syndrome-case-report
#18
G R De Freitas, C P De Oliveira, R S Reis, M R Sarmento, N K Gaspar, M Fialho, H Praxedes
Chédiak-Higashi syndrome is a rare hematological disease characterized by increased fusion of cytoplasmatic granules. Neurological symptoms occur in approximately half of the patients. We describe the clinical, eletrophysiological, hematological and radiological findings in a girl who had Chédiak-Higashi syndrome and seizures.
June 1999: Arquivos de Neuro-psiquiatria
https://www.readbyqxmd.com/read/10431273/-comparison-of-iodixanol-visipaque-and-ioxaglate-hexabrix-in-coronary-angiography-and-ventriculography-a-double-blind-randomized-study
#19
RANDOMIZED CONTROLLED TRIAL
R Roriz, G de Gevigney, G Finet, C Nantois-Collet, K W Borch, M Amiel, J Beaune
OBJECTIVE: To evaluate and compare in a double-blinded and prospective study the incidence of adverse reactions between two contrast agents used for coronary angiography and ventriculography. The first agent was the non-ionic, dimeric, isotonic contrast medium iodixanol (Visipaque), the other was the ionic dimeric contrast medium ioxaglate (Hexabrix). METHODS: A total of 110 consecutive patients were randomized and received either iodixanol 320 mgl/ml or ioxaglate 320 mgl/ml...
July 1999: Journal de Radiologie
https://www.readbyqxmd.com/read/9927825/-clostridium-difficile-as-an-inducer-of-inflammatory-diarrhea
#20
REVIEW
M F Rocha, J J Sidrim, A A Lima
Clostridium difficile has been pointed out as an important agent of diarrheal diseases associated with antibiotic use. However, due to its complexity, the physiopathology of these diseases is only partially elucidated, although a series of scientific works has demonstrated the importance of toxins A and B in the pathogenesis of the inflammatory diarrhea induced by this microorganism. The inflammatory mechanisms involved in the biological activities of these toxins are complex. There are some studies demonstrating that toxin B has no enterotoxic activity in vivo...
January 1999: Revista da Sociedade Brasileira de Medicina Tropical
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