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https://www.readbyqxmd.com/read/29140267/detection-of-partial-discharge-sources-using-uhf-sensors-and-blind-signal-separation
#1
Carlos Boya, Guillermo Robles, Emilio Parrado-Hernández, Marta Ruiz-Llata
The measurement of the emitted electromagnetic energy in the UHF region of the spectrum allows the detection of partial discharges and, thus, the on-line monitoring of the condition of the insulation of electrical equipment. Unfortunately, determining the affected asset is difficult when there are several simultaneous insulation defects. This paper proposes the use of an independent component analysis (ICA) algorithm to separate the signals coming from different partial discharge (PD) sources. The performance of the algorithm has been tested using UHF signals generated by test objects...
November 15, 2017: Sensors
https://www.readbyqxmd.com/read/29136906/comparison-of-common-components-analysis-with-principal-components-analysis-and-independent-components-analysis-application-to-spme-gc-ms-volatolomic-signatures
#2
Jihéne Bouhlel, Delphine Jouan-Rimbaud Bouveresse, Said Abouelkaram, Elisabeth Baéza, Catherine Jondreville, Angélique Travel, Jérémy Ratel, Erwan Engel, Douglas N Rutledge
The aim of this work is to compare a novel exploratory chemometrics method, Common Components Analysis (CCA), with Principal Components Analysis (PCA) and Independent Components Analysis (ICA). CCA consists in adapting the multi-block statistical method known as Common Components and Specific Weights Analysis (CCSWA or ComDim) by applying it to a single data matrix, with one variable per block. As an application, the three methods were applied to SPME-GC-MS volatolomic signatures of livers in an attempt to reveal volatile organic compounds (VOCs) markers of chicken exposure to different types of micropollutants...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29135355/changes-in-ocular-hemodynamics-after-carotid-artery-angioplasty-and-stenting-caas-in-patients-with-different-severity-of-ocular-ischemic-syndrome
#3
Feiyan Ma, Jing Su, Qingli Shang, Jingxue Ma, Tongdi Zhang, Xin Wang, Honglei Ma, Jianghua Yu
PURPOSE: To evaluate the effects of carotid artery angioplasty and stenting (CAAS) on patients who were diagnosed with ocular ischemic syndrome (OIS). METHODS: Sixty-four eyes of 64 OIS patients with ipsilateral internal carotid artery stenosis ≥70% were included in the study. The study eyes were divided into two groups according to the presence of iris neovascularization: NVI-absent group and NVI-present group, with 32 eyes, respectively. All patients received ocular treatment modality according to the presence of non-perfusion area (pan-retinal photocoagulation) and intraocular pressure (medical treatment included timolol maleate eye drops combined with brinzolamide eye drop; trabeculectomy and cyclophotocoagulation)...
November 14, 2017: Current Eye Research
https://www.readbyqxmd.com/read/29134268/clinical-significance-of-transluminal-attenuation-gradient-in-320-row-area-detector-coronary-ct-angiography
#4
Etsuro Kato, Shinichiro Fujimoto, Kazuhisa Takamura, Yuko Kawaguchi, Chihiro Aoshima, Makoto Hiki, Kanako K Kumamaru, Hiroyuki Daida
The clinical significance of the transluminal attenuation gradient (TAG) has not been established. We evaluated the incremental diagnostic value of TAG by 320-row area detector computed tomography (320-ADCT). Subjects were 65 patients who underwent one-rotation scanning by 320-ADCT and invasive coronary angiography (ICA) within 3 months. TAG values were obtained for the major epicardial vessels 2 mm or more each in RCA, LAD and LCX using automatic analysis software. Moreover, TAG values that excluded calcified lesions in calculation of the regression line were also evaluated (excluded-TAG)...
November 13, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/29134171/endoscopic-endonasal-repair-of-internal-carotid-artery-injury-during-endoscopic-endonasal-surgery
#5
Irit Duek, Gill E Sviri, Moran Amit, Ziv Gil
Background  Injury to the cavernous portion of the internal carotid artery (ICA) during endoscopic skull base surgery is a well-recognized rare complication that can be associated with high rates of morbidity and mortality. Many techniques have been suggested to manage ICA injury with varying degrees of success. Objectives  We provide a detailed technical description of an operative technique for endoscopic management of carotid artery injury. Methods  A case of ICA injury during endoscopic skull base surgery is presented...
October 2017: Journal of Neurological Surgery Reports
https://www.readbyqxmd.com/read/29134163/prognostic-indices-for-predicting-facial-nerve-outcome-following-the-resection-of-large-acoustic-neuromas
#6
Kurt Grahnke, Jonathan R Garst, Brendan Martin, John P Leonetti, Douglas E Anderson
This study analyzes the simple ratio of anterior-to-posterior extension of large (>2.5 cm) acoustic neuromas relative to the internal auditory canal (ICA; anterior-posterior [A/P] index) as a tool for predicting risk of facial nerve (FN) injury. In total, 105 patients who underwent microsurgical resection for large acoustic neuromas were analyzed retrospectively. House-Brackmann (HB) scores were assessed immediately postoperatively, at 1 month, and at 1 year. Lateral-medial, inferior-superior, A/P, and maximum diameters were measured from preoperative magnetic resonance images...
December 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/29130668/-analysis-on-clinical-characteristic-and-risk-factors-of-patients-coexistence-of-cerebral-artery-stenosis-with-unruptured-intracranial-aneurysm
#7
Hai-Yan Zhao, Jin-Tao Han, Dong-Sheng Fan
OBJECTIVE: To analyze the incidence of intracranial unruptured aneurysms in patients with intracranial artery stenosis,clinical features,and investigate the risk factors for unruptured intracranial aneurysms. METHODS: Medical records from all patients performed with digital subtraction angiography (DSA) who had been treated at Peking University Third Hospital,China,from January 2012 to December 2015 were retrospectively reviewed to identify cases coexistence with cerebral artery stenosis and unruptured intracranial aneurysm...
September 2017: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
https://www.readbyqxmd.com/read/29130560/patterns-of-vascularization-and-surgical-morbidity-in-juvenile-nasopharyngeal-angiofibroma-a-case-series-systematic-review-and-meta-analysis
#8
Jonathan B Overdevest, Matthew R Amans, Peter Zaki, Steven D Pletcher, Ivan H El-Sayed
BACKGROUND: Vascular patterns of juvenile nasopharyngeal angiofibroma (JNA) are poorly defined. We performed both institutional and systematic literature reviews to characterize the relationship between arterial supply patterns of JNA with intraoperative blood loss and tumor recurrence. METHODS: A retrospective review of 26 patients with JNA treated at our institution from 1995 to 2015 with available angiograms, and systematic reviews and meta-analyses of 828 JNA cases undergoing angiographic embolization published between 1995 and 2015 were completed per Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines...
November 11, 2017: Head & Neck
https://www.readbyqxmd.com/read/29129769/retrosigmoid-intradural-suprameatal-inframeatal-approach-for-complete-surgical-removal-of-a-giant-recurrent-vestibular-schwannoma-with-severe-petrous-bone-involvement-technical-case-report
#9
Yosuke Sato, Tohru Mizutani, Katsuyoshi Shimizu, Hans-Joachim Freund, Madjid Samii
BACKGROUND: Surgical removal of giant vestibular schwannomas with severe petrous bone involvement remains challenging due to the high risk of complications. The retrosigmoid intradural suprameatal-inframeatal approach (RISIA) allows for safe exposure extending from Meckel's cave to the petrous internal carotid artery (ICA). CLINICAL DESCRIPTION: A 27-year-old man presented with recurrence of a giant vestibular schwannoma (4.5 cm) invading Meckel's cave and the left petrous ICA...
November 9, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29128888/two-dimensional-speckle-tracking-global-longitudinal-strain-in-high-sensitivity-troponin-negative-low-risk-patients-with-unstable-angina-a-resting-ischemia-test
#10
Patrícia Marques-Alves, Nuno Espírito-Santo, Rui Baptista, Rogério Teixeira, Rui Martins, Francisco Gonçalves, Mariano Pego
With the introduction of high-sensitivity troponin (hsTNI) assays, the clinical significance unstable angina (UA) has become uncertain. We hypothesized that impaired left ventricular (LV) two-dimensional speckle-tracking echocardiography (2D-STE)-derived peak global longitudinal strain (GLS) was able to exclude the presence of significant coronary artery disease (CAD) in UA patients without prior cardiovascular (CV) events and with a normal LV ejection fraction (LVEF). From a cohort of 200 patients admitted with UA, we selected 61 patients without prior CV events and with a normal LVEF; of these, 48 (79%) underwent invasive coronary angiography (ICA) and 24 (39%) had at least ≥ 1 significant stenosis...
November 11, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29125372/matched-increases-in-cerebral-artery-shear-stress-irrespective-of-stimulus-induce-similar-changes-in-extra-cranial-arterial-diameter-in-humans
#11
Kurt J Smith, Ryan L Hoiland, Ryan Grove, Hamish McKirdy, Louise Naylor, Philip N Ainslie, Daniel J Green
The mechanistic role of arterial shear stress in the regulation of cerebrovascular responses to physiological stimuli (exercise and hypercapnia) is poorly understood. We hypothesised that, if shear stress is a key regulator of arterial dilation, then matched increases in shear, induced by distinct physiological stimuli, would trigger similar dilation of the large extra-cranial arteries. Participants ( n = 10) participated in three 30-min experimental interventions, each separated by ≥48 h: (1) mild-hypercapnia (FICO2:∼0...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29120580/serum-level-of-il17a-among-cirrhotic-hepatitis-c-virus-infected-patients-with-incidence-of-diabetes-mellitus
#12
Helal F Hetta, Azza Elkady, Khairy H Morsy, Ismael S Mohamed, Maggie A Ibrahim
IL17a is the key inflammatory cytokine of TH17 and contributes to the pathogenesis of diabetes mellitus which is a common endocrine disorder associated with HCV infection. Herein, 183 cirrhotic HCV infected patients were screened for ANA by ELISA and positive cases (n=40) were screened for ICA by Immunofluorescence and IL17a serum levels were measured by ELISA and compared to a control group (n=24). Out of 40 cirrhotic HCV, ANA (+) infected patients, 16 patients (40 %) were type 2 diabetic and 13 (32.5%) were non-diabetic...
January 2017: Egyptian Journal of Immunology
https://www.readbyqxmd.com/read/29119540/discrimination-of-stroke-related-mild-cognitive-impairment-and-vascular-dementia-using-eeg-signal-analysis
#13
Noor Kamal Al-Qazzaz, Sawal Hamid Bin Mohd Ali, Siti Anom Ahmad, Mohd Shabiul Islam, Javier Escudero
Stroke survivors are more prone to developing cognitive impairment and dementia. Dementia detection is a challenge for supporting personalized healthcare. This study analyzes the electroencephalogram (EEG) background activity of 5 vascular dementia (VaD) patients, 15 stroke-related patients with mild cognitive impairment (MCI), and 15 control healthy subjects during a working memory (WM) task. The objective of this study is twofold. First, it aims to enhance the discrimination of VaD, stroke-related MCI patients, and control subjects using fuzzy neighborhood preserving analysis with QR-decomposition (FNPAQR); second, it aims to extract and investigate the spectral features that characterize the post-stroke dementia patients compared to the control subjects...
November 8, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29118798/internal-carotid-artery-and-the-proximal-m1-segment-are-optimal-targets-for-mechanical-thrombectomy
#14
Niko Sillanpää, Sara Protto, Jukka T Saarinen, Juha-Pekka Pienimäki, Janne Seppänen, Heikki Numminen, Harri Rusanen
Background and Purpose: Mechanical thrombectomy (MT) is an established treatment of acute anterior circulation stroke caused by large vessel occlusion (LVO). We compared the clinical outcome (3-month modified Rankin Scale, mRS) in hyperacute (<3h from the onset of symptoms) ischemic stroke between an MT and an intravenous thrombolysis (IVT) cohort in proximal (ICA and the proximal M1 segment of the middle cerebral artery) and distal (the distal M1 and the M2 segment) LVOs. Methods: We prospectively reviewed 67 patients who underwent MT with newer-generation stent retrievers...
October 2017: Interventional Neurology
https://www.readbyqxmd.com/read/29118792/anchoring-pipeline-flow-diverter-construct-in-the-treatment-of-traumatic-distal-cervical-carotid-artery-injury
#15
Krishna Amuluru, Fawaz Al-Mufti, William Roth, Charles J Prestigiacomo, Chirag D Gandhi
Background: Traumatic extracranial internal carotid artery (ICA) dissections are uncommon and can be difficult to treat. Thinning of adventitia and dilatation may occur following arterial dissection, thus resulting in a fusiform pseudoaneurysm, which can subsequently cause bleeding, expanding, or pulsatile hematoma. Currently, medical management with anticoagulation remains the first line of treatment and yields good outcomes in 75% of cases with a mortality rate of 3-4%. Endovascular intervention is indicated with failure of medical therapy, progressive enlargement of a traumatic pseudoaneurysm, acute flow-related infarcts due to vessel occlusion, or when anticoagulation is contraindicated due to risk of pseudoaneurysm rupture and hemorrhage...
October 2017: Interventional Neurology
https://www.readbyqxmd.com/read/29118244/isolation-and-characterization-of-antigen-specific-plasmablasts-using-a-novel-flow-cytometry-based-ig-capture-assay
#16
Christopher L Pinder, Sven Kratochvil, Deniz Cizmeci, Luke Muir, Yanping Guo, Robin J Shattock, Paul F McKay
We report the development of a novel flow cytometry-based Ig capture assay (ICA) for the identification and sorting of individual Ab-secreting cells based on their Ag reactivity. The ICA represents a fast and versatile tool for single-cell sorting of peripheral plasmablasts, streamlining subsequent Ab analysis, and cloning. We demonstrate the utility of the assay by isolating Ag-reactive plasmablasts from cryopreserved PBMC obtained from volunteers vaccinated with a recombinant HIV envelope protein. To show the specificity of the ICA, we produced Ag-specific Abs from these cells and subsequently verified their Ag reactivity via ELISA...
November 8, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29114373/coiled-distal-internal-carotid-artery-ica-aneurysm-in-transcranial-sonography
#17
Masoud Mehrpour, Fahimeh Haji-Akhoundi, Babak Zamani
No abstract text is available yet for this article.
July 6, 2017: Iranian Journal of Neurology
https://www.readbyqxmd.com/read/29114317/agenesis-of-the-internal-carotid-artery-with-transcavernous-anastomosis-associated-with-anterior-communicating-artery-aneurysms
#18
Kosuke Kumagai, Satoru Takeuchi, Naoki Otani, Masaki Komiyama, Kentaro Mori
Agenesis of the internal carotid artery (ICA) is a rare congenital anomaly. Recently, several cases of ICA agenesis have been associated with cerebral aneurysms. We present the seventh case of ICA agenesis with transcavernous anastomosis associated with cerebral aneurysms. A 47-year-old man presented with transient numbness of his left hand. Magnetic resonance angiography indicated the presence of anterior communicating artery (ACoA) aneurysms. Digital subtraction angiography revealed two ACoA aneurysms, absence of the left ICA, and an anomalous collateral vessel connecting the cavernous portions of both internal carotid arteries, which was considered to be a transcavernous anastomosis...
October 2017: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/29113719/utilization-of-independent-component-analysis-for-accurate-pathological-ripple-detection-in-intracranial-eeg-recordings-recorded-extra-and-intra-operatively
#19
Shoichi Shimamoto, Zachary J Waldman, Iren Orosz, Inkyung Song, Anatol Bragin, Itzhak Fried, Jerome Engel, Richard Staba, Ashwini Sharan, Chengyuan Wu, Michael R Sperling, Shennan A Weiss
OBJECTIVE: To develop and validate a detector that identifies ripple (80-200 Hz) events in intracranial EEG (iEEG) recordings in a referential montage and utilizes independent component analysis (ICA) to eliminate or reduce high-frequency artifact contamination. Also, investigate the correspondence of detected ripples and the seizure onset zone (SOZ). METHODS: iEEG recordings from 16 patients were first band-pass filtered (80-600 Hz) and Infomax ICA was next applied to derive the first independent component (IC1)...
October 25, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29111821/correlations-of-corneal-optical-densitometry-endothelial-hexagonality-percentage-and-epithelium-thickness
#20
Gökhan Pekel, Fatih Özbakış, Alperen Bahar, Evre Pekel, Ebru Nevin Çetin
PURPOSE: Our aim was to examine the associations between the cornea morphological parameters, endothelial cell density, and anterior chamber measurements. METHODS: This observational study included 50 eyes of 50 healthy volunteers. The thicknesses of corneal epithelium, Bowman's layer, stroma, Descemet's membrane-endothelium complex, and pre-ocular tear film were measured by means of anterior segment optical coherence tomography. The keratometry (K), corneal volume (CV), corneal optical densitometry (COD), iridocorneal angle (ICA), anterior chamber depth (ACD), and anterior chamber volume (ACV) measurements were taken by the Scheimpflug anterior segment imaging...
November 7, 2017: Current Eye Research
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