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Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society

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https://read.qxmd.com/read/30720554/repeated-transcranial-magnetic-stimulation-induced-motor-evoked-potentials-correlate-with-the-subject-specific-serum-metabolic-profile-of-creatine
#1
Elisa Kallioniemi, Olli Kärkkäinen, Sara Määttä, Mervi Könönen, Petri Kivimäki, Outi Kaarre, Vidya Velagapudi, Virve Kekkonen, Soili M Lehto, Eila Laukkanen, Tommi Tolmunen
PURPOSE: Transcranial magnetic stimulation-induced motor responses have been considered to mainly reflect the electrophysiological characteristics of the central motor system. However, certain motor phenomena, such as the magnitude of repetition suppression measured with motor evoked potentials (MEPs), could also in part be influenced by metabolic processes in the peripheral muscles and in both the peripheral and central nervous system. Repetition suppression is an inhibitory phenomenon in which the amplitude of MEP decreases in comparison to that of the first MEP in a train of transcranial magnetic stimulation pulses...
February 1, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30694945/area-under-the-curve-of-somatosensory-evoked-potentials-detects-spinal-cord-injury
#2
Ahmed Jorge, James Zhou, Edward C Dixon, Kojo D Hamilton, Jeffrey Balzer, Parthasarathy Thirumala
PURPOSE: Intraoperative neurophysiological monitoring using somatosensory evoked potentials has been linked to a reduction in the incidence of neurological deficits during corrective surgery. Nonetheless, quantitative assessments of somatosensory evoked potential waveforms are often difficult to evaluate, because they are affected by anesthesia, injury, and noise. Here, we discuss a novel method that integrates somatosensory evoked potential signals into a single metric by calculating the area under the curve (AUC)...
January 28, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30694944/supranormal-sensory-nerve-action-potential-amplitude-correlates-of-sensory-symptoms
#3
Philip W Tipton, Devon I Rubin
PURPOSE: Patients presenting with pain, numbness, or paresthesias frequently have normal electrodiagnostic studies. Supranormal sensory nerve action potential amplitudes may be a potential biomarker of sensory nerve hyperexcitability. METHODS: A retrospective chart review of 400 consecutive patients with normal electromyography reports between July and November 2016 was performed. Patients were divided into tertiles based on the degree of sensory nerve action potential amplitudes above lower limits of normal (<2×, 2-3×, and >3×)...
January 28, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30694943/clinical-and-eeg-characteristics-of-ifosfamide-related-encephalopathy
#4
Aaron M Gusdon, Rachna Malani, Xi Chen
PURPOSE: Ifosfamide can lead to a syndrome of central nervous system toxicity. Here, we investigate the clinical and EEG characteristics of patients with ifosfamide-related encephalopathy. METHODS: Retrospective data were collected on patients from Memorial Sloan Kettering Cancer Center, who developed encephalopathy associated with ifosfamide between 2007 and 2017. Patients who had an EEG performed were included. Clinical and laboratory data were retrospectively collected...
January 28, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30694942/somatosensory-evoked-potentials-as-a-stand-alone-tool-during-spine-surgery-an-egyptian-preliminary-report
#5
Ann Ali Abdelkader, Ahmed Zohdi, Amira M El Gohary, Reem Atef El-Hadidy, Rania Ahmed Almahdy
PURPOSE: Monitoring of somatosensory evoked potentials (SSEPs) serves as an early warning system to detect spinal cord injury and is correlated with postoperative sensory findings. It is an indirect indicator of motor function. This study aimed to evaluate the usefulness of intraoperative SSEPs monitoring as a stand-alone tool during spinal surgeries when motor evoked potentials are not available, to prevent and predict new postoperative neurologic deficits. Motor evoked potentials were not used as the equipment needed to record them was not available at the time of this study...
January 28, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30694941/technical-description-of-long-term-high-density-eeg-monitoring-using-128-channel-cap-applied-with-a-conductive-paste
#6
Juan G Ochoa, James Rini, Judy Diaz, Jennifer Botwell
PURPOSE: EEG is a common diagnostic tool to localize epileptic activity with excellent temporal resolution and, however, with relatively low spatial resolution. High-density EEG recording is limited in clinical practice, mainly because of electrode placement difficulties, need of high technical skills, and advanced equipment requirement. METHODS: We described the technique of long-term EEG recording using a 128-channel neoprene cap placed with a dielectric paste in 7 patients with refractory epilepsy...
January 28, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30688773/baclofen-neurotoxicity-a-metabolic-encephalopathy-susceptible-to-exacerbation-by-benzodiazepine-therapy
#7
James D Triplett, Nicholas D Lawn, John W Dunne
PURPOSE: Baclofen has been reported to cause both a metabolic encephalopathy and nonconvulsive status epilepticus. Baclofen is typically used in the management of muscle spasticity but is being increasingly used to manage alcohol withdrawal and opiate dependency. Given the increasing use of baclofen we describe the clinical and electrographical features of baclofen neurotoxicity seen at our institution. METHODS: The clinical and EEG features of patients with an encephalopathy in the setting of baclofen therapy were analyzed...
January 24, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30688772/use-of-continuous-eeg-monitoring-in-children-presenting-with-encephalopathy-following-convulsive-status-epilepticus
#8
Asri Yuliati, Amanda R B Weber
PURPOSE: The Critical Care Continuous EEG Task Force of the American Clinical Neurophysiology Society recommends continuous EEG (cEEG) monitoring in patients with persistent encephalopathy following convulsive status epilepticus. This recommendation is based on data, which correlates prolonged nonconvulsive seizures and nonconvulsive status epilepticus with worse neurologic outcomes. Compliance with these recommendations may be limited by barriers such as inadequate resource and staff availability...
January 24, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30648977/eeg-in-wnv-neuroinvasive-disease
#9
Angela M Parsons, Marie F Grill, Anteneh M Feyissa, Jeffrey Britton, Sara Hocker, Amy Crepeau
PURPOSE: Neuroinvasive West Nile virus (WNV) is rare, occurring in less than 1% of those infected, and may manifest as meningitis, encephalitis, and/or acute flaccid paralysis. Patients may present initially with nonspecific symptoms including fevers. Although rare, neuroinvasive WNV is associated with significant morbidity and mortality. The mainstay of treatment is supportive care. Electroencephalography (EEG) allows for identification of nonconvulsive status epilepticus and other epileptiform and nonepileptiform patterns suggestive of underlying cognitive dysfunction...
January 21, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30624286/improving-the-reliability-of-v-wave-responses-in-the-soleus-muscle
#10
Goncalo V Mendonca, Carolina Teodósio, Miguel Mouro, Sandro Freitas, Pedro Mil-Homens, Pedro Pezarat-Correia, Carolina Vila-Chã
PURPOSE: The V wave is an electrophysiologic variant of the H reflex that is evoked with supramaximal stimulus intensity. In this study, we explored whether the between-day reliability of V-wave normalized amplitude varies as a function of the number of intrasession measurement trials. We also determined whether the reliability of the V wave improves after the exclusion of the initial testing trials. METHODS: Eighteen healthy, young participants (10 men and 8 women) were included in this study...
January 7, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30624287/the-diagnostic-utility-of-ambulatory-eeg-following-nondiagnostic-epilepsy-monitoring-unit-admissions
#11
Jonah Fox, Shaun Ajinkya, Pramod Chopade, Sarah Schmitt
PURPOSE: Epilepsy monitoring unit (EMU) admissions provide a definitive diagnosis for approximately three-quarters of patients. However, many patients do not receive a definitive diagnosis following EMU admission. Ambulatory EEG following nondiagnostic EMU admissions was evaluated as a means of providing a diagnosis for these patients. METHODS: In this retrospective study, we performed a chart review of 62 pediatric and adult patients who had a 72-hour ambulatory EEG following a nondiagnostic EMU admission...
January 3, 2019: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30608275/generalized-periodic-discharges-with-and-without-triphasic
#12
Ayham Alkhachroum, Haifa Al-Abri, Alok Sachdeva, Sarita Maturu, Jennifer Waldron, Han Wang, Macym Rizvi, Guadalupe Fernandez-Baca Vaca, Hans O Lüders
No abstract text is available yet for this article.
December 31, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30589767/interictal-slow-and-high-frequency-oscillations-is-it-an-epileptic-slow-or-red-slow
#13
Takeshi Inoue, Morito Inouchi, Masao Matsuhashi, Riki Matsumoto, Takefumi Hitomi, Masako Daifu-Kobayashi, Katsuya Kobayashi, Mitsuyoshi Nakatani, Kyoko Kanazawa, Akihiro Shimotake, Takayuki Kikuchi, Kazumichi Yoshida, Takeharu Kunieda, Susumu Miyamoto, Ryosuke Takahashi, Akio Ikeda
PURPOSE: We reported the presence of interictal slow and high-frequency oscillations (HFOs) (IIS + HFO) and its temporal change so as to elucidate its clinical usefulness as a surrogate marker of epileptogenic zone in a patient with intractable focal epilepsy. METHODS: We focused on one of the core electrodes of epileptogenicity, and investigated IIS + HFO in the pre- and post-segment of 30 minutes to all the 6 seizures. We adopted interictal slow in duration of 0...
December 26, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30585889/nonconvulsive-status-epilepticus-validating-the-salzburg-criteria-against-an-expert-eeg-examiner
#14
Martin H Krogstad, Hans Høgenhaven, Christoph P Beier, Thomas Krøigård
PURPOSE: Rapid and correct diagnosis of nonconvulsive status epilepticus (NCSE) is crucial for optimal treatment. However, electroencephalographic diagnosis can be challenging. Salzburg Consensus Criteria (SCC) have been proposed to facilitate correct diagnosis, but their validity needs to be further established. METHODS: We retrospectively reanalyzed the first EEG in adult patients (n = 284) referred under the suspicion of NCSE at our institution in 2014. Nonconvulsive status epilepticus or possible NCSE was diagnosed according to the SCC by an examiner specifically trained in SCC and was compared with the original diagnosis made by an expert EEG examiner, which in this context served as the reference standard, to assess the validity of the criteria...
December 21, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30585908/evaluating-an-interdisciplinary-eeg-initiative-on-in-training-examination-eeg-related-item-scores-for-anesthesiology-residents
#15
Brenda G Fahy, Terrie Vasilopoulos, Meriem Bensalem-Owen, Destiny F Chau
PURPOSE: Clinical neurophysiology is an evolving area of medicine with clinical applications in intensive care unit and intraoperative settings, where EEG is used. An interdisciplinary module was implemented over 7 years in one institution to strengthen anesthesiology residents' EEG education. This study researched the module's outcome by evaluating participants' specific performance on EEG-related questions (keywords) through independent testing, i.e., the in-training examinations (ITEs)...
December 20, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30550491/generalized-periodic-discharges-with-and-without-triphasic-morphology
#16
Michael W K Fong, Nicolas Gaspard, Lawrence J Hirsch
No abstract text is available yet for this article.
December 12, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30531427/triple-stimulation-technique-in-amyotrophic-lateral-sclerosis
#17
Yue Wang, Han Wang, Li-Ying Cui
PURPOSE: To identify upper motor neuron (UMN) dysfunction using the triple stimulation technique (TST) in amyotrophic lateral sclerosis (ALS). METHODS: Fifty ALS and 42 non-ALS patients were examined clinically, using conventional transcranial magnetic stimulation and TST. RESULTS: For ALS patients presenting with UMN in tested limb, the TST amplitude ratio was abnormal in 25 of 28 patients (89.3%). For ALS patients without UMN signs, 6 of 22 patients (27...
December 7, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30531428/novel-use-of-responsive-neurostimulation-rns-system-in-the-treatment-of-super-refractory-status-epilepticus
#18
Lia D Ernst, Katie L Krause, Marissa A Kellogg, Ahmed M Raslan, David C Spencer
There are very few randomized controlled trials studying treatment of super refractory status epilepticus (SE), despite estimated occurrence in about 15% of SE cases and its association with high morbidity and mortality rates. Small case series and case reports have described use of neurostimulation, including vagal nerve stimulation, transcranial magnetic stimulation, and deep brain stimulation, to treat super refractory SE when medical interventions have failed. To our knowledge, this is the first reported case of responsive neurostimulation being used to successfully treat a case of super refractory SE...
December 6, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30507655/electrophysiological-assessment-of-the-impact-of-mobile-phone-radiation-on-cognition-in-persons-with-epilepsy
#19
Noha Elsawy, Saly Elkholy, Radwa Azmy, Eman A Maher, Reham Shamloul
PURPOSE: Serious concerns about the effect of mobile phone radiation on cognition are growing. This study aimed to assess the possible effect of mobile phone radiation in persons with epilepsy and in normal subjects. METHODS: The amplitude and reaction time of auditory event-related potentials (P300) and occipital alpha frequency were compared before and after exposure with a 30-minute call in 30 persons with epilepsy and in 30 control subjects. Alpha power was monitored before, during, and after exposure to mobile phone radiation...
November 28, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://read.qxmd.com/read/30489402/heart-rate-variability-during-nocturnal-sleep-and-daytime-naps-in-patients-with-narcolepsy-type-1-and-type-2
#20
Sabina Aslan, Nurhan Erbil, F Irsel Tezer
PURPOSE: Heart rate variability is a noninvasive measure of autonomic function. The aim of this study was to determine the risk of cardiovascular autonomic dysfunction during sleep in patients with narcolepsy. The effect of daytime napping was also examined in patients with narcolepsy type 1 and type 2. METHODS: Polysomnography recordings and multiple sleep latency tests from 11 patients with narcolepsy type 1 (N1) and 20 patients with narcolepsy type 2 (N2) were included and compared with 12 healthy controls...
November 27, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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