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

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https://www.readbyqxmd.com/read/29771747/diagnostic-utility-of-reduced-electroencephalography
#1
Kapil Gururangan
No abstract text is available yet for this article.
May 15, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29746390/electrophysiology-of-olfactory-and-optic-nerve-in-outpatient-and-intraoperative-settings
#2
Praveen Hariharan, Jeffery R Balzer, Katherine Anetakis, Donald J Crammond, Parthasarathy D Thirumala
No abstract text is available yet for this article.
May 9, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29746391/magnetoencephalographic-mapping-of-epileptic-spike-population-using-distributed-source-analysis-comparison-with-intracranial-electroencephalographic-spikes
#3
Naoaki Tanaka, Christos Papadelis, Eleonora Tamilia, Joseph R Madsen, Phillip L Pearl, Steven M Stufflebeam
INTRODUCTION: This study evaluates magnetoencephalographic (MEG) spike population as compared with intracranial electroencephalographic (IEEG) spikes using a quantitative method based on distributed source analysis. METHODS: We retrospectively studied eight patients with medically intractable epilepsy who had an MEG and subsequent IEEG monitoring. Fifty MEG spikes were analyzed in each patient using minimum norm estimate. For individual spikes, each vertex in the source space was considered activated when its source amplitude at the peak latency was higher than a threshold, which was set at 50% of the maximum amplitude over all vertices...
April 27, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29677014/continuous-electroencephalography-in-the-critically-ill-clinical-and-continuous-electroencephalography-markers-for-targeted-monitoring
#4
Christopher R Newey, Tyler G Kinzy, Vineet Punia, Stephen Hantus
PURPOSE: Electrographic seizures detected by continuous electroencephalography (CEEG) in critically ill patients with altered mental status is becoming increasingly recognized. Data guiding the appropriate selection of patients to be monitored on CEEG are lacking. The aims of this article were to study the incidence of seizures in the critical care setting and to evaluate for clinical predictors to improve the efficiency of CEEG monitoring. METHODS: Retrospective review of the CEEG and clinical data on 1,123 consecutive patients who had continuous video EEG over a 24-month period...
April 17, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29649014/structural-mri-correlates-of-cognitive-event-related-potentials-in-multiple-sclerosis
#5
Artemios K Artemiadis, Maria C Anagnostouli, Ioannis G Zalonis, Konstantinos G Chairopoulos, Nikos I Triantafyllou
PURPOSE: Cognitive impairment in multiple sclerosis has been associated with cognitive event-related potentials and MRI abnormalities. This study aims to explore for the first time the association between P300 and MRI in multiple sclerosis. METHODS: Fifty-eight relapsing-remitting patients (41.5 ± 10.5 years old, 41 women, disease duration 139.7 ± 84.9 months) and 51 healthy controls were used. Visual P300 responses and a set of 2- or 3-dimensional MRI indices were obtained...
April 10, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29649013/eeg-patterns-in-patients-with-calcified-neurocysticercosis-with-or-without-hippocampal-atrophy
#6
Naoum P Issa, Mark J Sedler, Victor J Del Brutto, Elizabeth Darsan, Lucía Milla, Jessica Montes, Mauricio Zambrano, Oscar H Del Brutto
PURPOSE: To assess whether hippocampal atrophy develops in conjunction with clinical or subclinical epileptiform or encephalopathic activity in subjects with neurocysticercosis (NCC). METHODS: Using a population-based and nested case-control study design, scalp EEGs and brain MRIs were performed in Atahualpa residents aged ≥40 years, who have imaging-confirmed NCC (case patients), as well as in age- and sex-matched NCC-free control subjects. RESULTS: Sixty-two case patients and 62 control subjects were included...
April 10, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29547472/clinical-and-electrographic-correlates-of-bilateral-independent-periodic-discharges
#7
Brin Freund, James J Gugger, Alexandra Reynolds, William O Tatum, Jan Claassen, Peter W Kaplan
PURPOSE: Periodic discharges (PDs) are EEG patterns denoting brain dysfunction and ictal tendency. Their exact meaning regarding etiology and outcomes is not well known. In particular, bilateral independent PDs (BIPDs) are poorly described. METHODS: We performed a retrospective, multicenter study evaluating neuroimaging, epileptic, clinical, and EEG correlates of BIPDs. RESULTS: Twenty-five patients studied with a mean Glasgow Coma Scale 6...
March 15, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29533307/does-continuous-video-eeg-in-patients-with-altered-consciousness-improve-patient-outcome-current-evidence-and-randomized-controlled-trial-design
#8
Andrea O Rossetti, Kaspar Schindler, Vincent Alvarez, Raoul Sutter, Jan Novy, Mauro Oddo, Loane Warpelin-Decrausaz, Stephan Rüegg
Continuous video-EEG is recommended for patients with altered consciousness; as compared to routine EEG (lasting <30 minutes), it improves seizure detection, but is time- and resource-consuming. Although North American centers increasingly implement continuous video-EEG, most other (including European) hospitals have insufficient resources. Only one study suggested that continuous video-EEG could improve outcome in adults, and a recent assessments challenge this view. This article reviews current evidence on the added value for continuous video-EEG in clinical terms and describes a design for a prospective study...
March 8, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29718832/stimulus-induced-rhythmic-periodic-or-ictal-discharges-sirpids
#9
Emily L Johnson, Peter W Kaplan, Eva K Ritzl
Stimulus-induced rhythmic, periodic, or ictal discharges (SIRPIDs) are a relatively common phenomenon found on prolonged electroencephalogram (EEG) monitoring that captures state changes and stimulation of critically ill patients. Common causes include hypoxic injury, traumatic brain injury, and hemorrhage, as well as toxic-metabolic disturbances. Some studies have shown an association between SIRPIDs and the presence of spontaneous electrographic seizures. Although the degree to which SIRPIDs should be treated with antiepileptic medications is unknown, the rare cases of functional imaging obtained in patients with SIRPIDs have not shown an increase in cerebral blood flow to suggest an active ictal process...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29718831/generalized-and-lateralized-rhythmic-patterns
#10
Sarah E Schmitt
The relationship between generalized and lateralized rhythmic delta activity (RDA) and seizures is more ambiguous than the relationship between periodic discharges and seizures. Although frontally predominant generalized RDA is not associated with seizures, occipitally predominant RDA may be associated with the absence of seizures. Lateralized RDA seems to be more strongly associated with the presence of seizure activity. Appropriate recognition of generalized RDA and lateralized rhythmic delta activity may be confounded by benign etiologies of RDA, such as phi rhythm, slow alpha variant, subclinical rhythmic electrographic discharges of adults, or hyperventilation-induced high-amplitude rhythmic slowing...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29718830/systematic-review-of-bilateral-independent-periodic-discharges-written-for-topical-journal-subject-on-periodic-discharges
#11
Brin Freund, Peter W Kaplan
Periodic discharges (PDs) are EEG patterns that may have important clinical and prognostic implications. There are different subtypes of PDs that are delineated by their location, and each type may have different meaning regarding prognosis and clinical associations. Bilateral independent PDs are a subtype that have not been analyzed recently and remain poorly understood. In this article, we systematically review the literature to better describe bilateral independent PDs regarding underlying neuropathology, neuroimaging, and neuroexamination correlates, seizure incidence, EEG characteristics, their comparison with other PD subtypes, and prognostic meaning...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29718829/generalized-periodic-discharges-a-topical-review
#12
Krystal E Sully, Aatif M Husain
Generalized periodic discharges (GPDs) are generalized discharges that recur with a relatively uniform morphology and duration. They have a quantifiable interdischarge interval. Over the past decade, our understanding of these waveforms has improved considerably. The nomenclature has changed, and etiologic references have been removed. Many disease states can cause GPDs, such as anoxia, toxic/metabolic encephalopathy, infections, nonconvulsive status epilepticus, and hypothermia. Generally, GPDs are morphologically similar regardless of etiology...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29718828/lateralized-periodic-discharges-a-literature-review
#13
Lu Lin, Frank W Drislane
The purpose of this article is to provide a comprehensive review of the literature about a particular EEG pattern, lateralized periodic discharges (LPDs), or periodic lateralized epileptiform discharges (PLEDs). The review will discuss the history and terminology of LPDs and provide a detailed summary of the etiologies, pathophysiology, clinical symptoms, and imaging studies related to LPDs. Current controversies about the association of LPDs with seizures and their management will be reviewed. Finally, some unanswered questions and suggestions for future research on LPDs will be discussed...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29718827/definition-and-classification-of-periodic-and-rhythmic-patterns
#14
Carolina B Maciel, Lawrence J Hirsch
The growing use of continuous video-EEG recording in the inpatient setting, in particular in patients with varying degrees of encephalopathy, has yielded a window to the brain with an excellent temporal resolution. This increasingly available tool has become more than an instrument to detect nonconvulsive seizures (its primary use), and clinical indications span from ischemia detection in acute brain injuries, neuroprognostication of comatose patients, to monitoring the degree of encephalopathy. In this context, abnormal findings such as periodic discharges and rhythmic delta activity were increasingly recognized; however, significant subjectivity remained in the interpretation of these findings pertaining to key features regarding their spatial involvement, prevalence of occurrence, duration, associated morphologic features, and behavior...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29718826/one-or-five-alarm-fire-do-we-call-out-the-fire-engines-or-turn-on-the-sprinklers-an-overview-of-the-ictal-interictal-continuum-and-approaches-to-understanding-the-spectrum-and-treatment
#15
Emily L Johnson, Peter W Kaplan
No abstract text is available yet for this article.
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29521808/electromyographic-study-of-thoracic-paraspinal-and-rectus-abdominis-muscles-in-amyotrophic-lateral-sclerosis
#16
Thomas Zambelis, Pinelopi Koutsoudaki, Evangelos Anagnostou, Panagiotis Kokotis, Nikolaos Karandreas
PURPOSE: The aim of our study was the comparison of active denervation (fibrillation and/or positive sharp wave potentials) in thoracic paraspinal muscles with rectus abdominis in patients with definite amyotrophic lateral sclerosis. METHODS: Ninety-five consecutive patients with clinically definite amyotrophic lateral sclerosis according to the revised El Escorial criteria were studied prospectively over a 5-year period. Concentric needle electromyogram was performed in thoracic paraspinal muscles, in the rectus abdominis at the T9 level, and in limb muscles...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29470192/sensitivity-of-a-reduced-eeg-montage-for-seizure-detection-in-the-neurocritical-care-setting
#17
Brandy B Ma, Emily L Johnson, Eva K Ritzl
INTRODUCTION: Neurocritical care units commonly implement the double-distance reduced EEG montage in postoperative neurosurgic patients who have structural barriers that hinder the placement of a standard 10-20 system array. Despite its widespread use, its sensitivity has not been adequately addressed. We evaluated the sensitivity and specificity of this montage for seizure detection. METHODS: One hundred fifty-five full-montage continuous EEGs (cEEGs) completed in the Johns Hopkins University neurocritical care unit containing unequivocal electrographic seizures, status epilepticus, or other abnormalities were selected, comprising 73 ictal and 82 nonictal EEGs...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29443794/stability-of-early-eeg-background-patterns-after-pediatric-cardiac-arrest
#18
Nicholas S Abend, Rui Xiao, Sudha Kilaru Kessler, Alexis A Topjian
PURPOSE: We aimed to determine whether EEG background characteristics remain stable across discrete time periods during the acute period after resuscitation from pediatric cardiac arrest. METHODS: Children resuscitated from cardiac arrest underwent continuous conventional EEG monitoring. The EEG was scored in 12-hour epochs for up to 72 hours after return of circulation by an electroencephalographer using a Background Category with 4 levels (normal, slow-disorganized, discontinuous/burst-suppression, or attenuated-featureless) or 2 levels (normal/slow-disorganized or discontinuous/burst-suppression/attenuated-featureless)...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29438177/eeg-factors-after-pediatric-cardiac-arrest
#19
Nicholas S Abend, Douglas J Wiebe, Rui Xiao, Shavonne L Massey, Mark Fitzgerald, France Fung, Alexis A Topjian
PURPOSE: We aimed to determine whether conventional standardized EEG features could be consolidated into a more limited number of factors and whether the derived factor scores changed during the acute period after pediatric cardiac arrest. METHODS: Children resuscitated after cardiac arrest underwent conventional continuous EEG monitoring. The EEG was scored in 12-hour epochs for up to 72-hours after return of circulation by an electroencephalographer using standardized critical care EEG terminology...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29438175/effect-of-fascia-penetration-on-sensory-nerve-conduction-in-the-superficial-radial-nerve
#20
Hye Jung Park, Joon Shik Yoon, Won Ihl Rhee, Jea Won Kim, Seung Nam Yang, Sun Jae Won
PURPOSE: The aim of this study was to identify the effects of fascia penetration on superficial radial sensory nerve action potential amplitude. METHODS: The penetration point (PP) at which the nerve penetrated the brachioradialis fascia and became superficial was observed using ultrasonography. The sensory nerve action potential amplitude was measured at five points: the penetration point, 2 and 4 cm proximal to the PP, and 2 and 4 cm distal to the PP. RESULTS: The sensory nerve action potential amplitude at the penetration point and at 2 and 4 cm distal to the PP was significantly larger than that at 2 and 4 cm proximal to the PP...
May 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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