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https://www.readbyqxmd.com/read/28523469/system-for-automatic-heart-rate-calculation-in-epileptic-seizures
#1
Marcin Kołodziej, Andrzej Majkowski, Remigiusz J Rak, Bartosz Świderski, Andrzej Rysz
This article presents a comprehensive system for automatic heart rate (HR) detection. The system is robust and resistant to disturbances (noise, interferences, artifacts) occurring mainly during epileptic seizures. ECG signal filtration (IIR) and normalization due to skewness and standard deviation were used as preprocessing steps. A key element of the system is a reference QRS complex pattern calculated individually for each ECG recording. Next, a cross-correlation of the reference QRS pattern with short, normalized ECG windows is calculated and the maxima of the correlation are found (R-wave locations)...
May 18, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28513853/association-between-textural-and-morphological-tumor-indices-on-baseline-pet-ct-and-early-metabolic-response-on-interim-pet-ct-in-bulky-malignant-lymphomas
#2
Fayçal Ben Bouallègue, Yassine Al Tabaa, Marilyne Kafrouni, Guillaume Cartron, Fabien Vauchot, Denis Mariano-Goulart
PURPOSE: We investigated whether metabolic, textural and morphological tumoral indices evaluated on baseline PET-CT were predictive of early metabolic response on interim PET-CT in a cohort of patients with bulky Hodgkin and non-Hodgkin malignant lymphomas. METHODS: This retrospective study included 57 patients referred for initial PET-CT examination. In-house dedicated software was used to delineate tumor contours using a fixed 30% threshold of SUV max and then to compute tumoral metabolic parameters (SUV max, mean, peak, standard deviation, skewness and kurtosis, metabolic tumoral volume (MTV), total lesion glycolysis, and area under the curve of the cumulative histogram), textural parameters (Moran's and Geary's indices, energy, entropy, contrast, correlation derived from the gray-level co-occurrence matrix, area under the curve of the power spectral density, auto-correlation distance, and granularity), and shape parameters (surface, asphericity, convexity, surfacic extension, and 2D and 3D fractal dimensions)...
May 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28484820/-vertigo-and-dizziness-in-the-emergency-room
#3
REVIEW
A Zwergal, K Möhwald, M Dieterich
Vertigo and dizziness are among the most common chief complaints in the emergency department. Etiologies can be categorized into three subgroups: neurootological (vestibular), medical (especially cardiovascular, metabolic), and psychiatric disorders. The diagnostic approach in the emergency department is based on a systematic analysis of case history (type, time course of symptoms, modulating factors, associated symptoms), clinical examination of the vestibular, ocular motor, and cerebellar systems (head impulse test, nystagmus, skew deviation, positioning maneuver, test of gait and stance), as well as a basal monitoring (vital signs, 12-lead ECG, blood tests)...
May 8, 2017: Der Nervenarzt
https://www.readbyqxmd.com/read/28474892/current-phase-relation-of-ballistic-graphene-josephson-junctions
#4
G Nanda, J L Aguilera-Servin, P Rakyta, A Kormányos, R Kleiner, D Koelle, K Watanabe, T Taniguchi, L M K Vandersypen, S Goswami
The current-phase relation (CPR) of a Josephson junction (JJ) determines how the supercurrent evolves with the superconducting phase difference across the junction. Knowledge of the CPR is essential in order to understand the response of a JJ to various external parameters. Despite the rising interest in ultraclean encapsulated graphene JJs, the CPR of such junctions remains unknown. Here, we use a fully gate-tunable graphene superconducting quantum intereference device (SQUID) to determine the CPR of ballistic graphene JJs...
May 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28441749/using-wavelet-packet-transform-for-surface-roughness-evaluation-and-texture-extraction
#5
Xiao Wang, Tielin Shi, Guanglan Liao, Yichun Zhang, Yuan Hong, Kepeng Chen
Surface characterization plays a significant role in evaluating surface functional performance. In this paper, we introduce wavelet packet transform for surface roughness characterization and surface texture extraction. Surface topography is acquired by a confocal laser scanning microscope. Smooth border padding and de-noise process are implemented to generate a roughness surface precisely. By analyzing the high frequency components of a simulated profile, surface textures are separated by using wavelet packet transform, and the reconstructed roughness and waviness coincide well with the original ones...
April 23, 2017: Sensors
https://www.readbyqxmd.com/read/28429801/the-dizzy-patient-don-t-forget-disorders-of-the-central-vestibular-system
#6
REVIEW
Thomas Brandt, Marianne Dieterich
Vertigo and dizziness are among the most common complaints in neurology clinics, and they account for about 13% of the patients entering emergency units. In this Review, we focus on central vestibular disorders, which are mostly attributable to acute unilateral lesions of the bilateral vestibular circuitry in the brain. In a tertiary interdisciplinary outpatient dizziness unit, central vestibular disorders, including vestibular migraine, comprise about 25% of the established diagnoses. The signs and symptoms of these disorders can mimic those of peripheral vestibular disorders with sustained rotational vertigo...
April 21, 2017: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/28419171/ultrasound-texture-analysis-association-with-lymph-node-metastasis-of-papillary-thyroid-microcarcinoma
#7
Soo-Yeon Kim, Eunjung Lee, Se Jin Nam, Eun-Kyung Kim, Hee Jung Moon, Jung Hyun Yoon, Kyung Hwa Han, Jin Young Kwak
This retrospective study aimed to evaluate whether ultrasound texture analysis is useful to predict lymph node metastasis in patients with papillary thyroid microcarcinoma (PTMC). This study was approved by the Institutional Review Board, and the need to obtain informed consent was waived. Between May and July 2013, 361 patients (mean age, 43.8 ± 11.3 years; range, 16-72 years) who underwent staging ultrasound (US) and subsequent thyroidectomy for conventional PTMC ≤ 10 mm between May and July 2013 were included...
2017: PloS One
https://www.readbyqxmd.com/read/28416644/evaluation-of-different-estimation-methods-for-accuracy-and-precision-in-biological-assay-validation
#8
Binbing Yu, Harry Yang
Biological assays (bioassays) are procedures to estimate the potency of a substance by studying its effects on living organisms, tissues, and cells. Bioassays are essential tools for gaining insight into biologic systems and processes including, for example, the development of new drugs and monitoring environmental pollutants. Two of the most important parameters of bioassay performance are relative accuracy (bias) and precision. Although general strategies and formulas are provided in USP 〈1033〉, a comprehensive understanding of the definitions of bias and precision remain elusive...
April 17, 2017: PDA Journal of Pharmaceutical Science and Technology
https://www.readbyqxmd.com/read/28399805/tno1-a-tgn-localized-snare-interacting-protein-modulates-root-skewing-in-arabidopsis-thaliana
#9
Rahul Roy, Diane C Bassham
BACKGROUND: The movement of plant roots within the soil is key to their ability to interact with the environment and maximize anchorage and nutrient acquisition. Directional growth of roots occurs by a combination of sensing external cues, hormonal signaling and cytoskeletal changes in the root cells. Roots growing on slanted, impenetrable growth medium display a characteristic waving and skewing, and mutants with deviations in these phenotypes assist in identifying genes required for root movement...
April 11, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28397569/analysis-of-an-ordinal-endpoint-for-use-in-evaluating-treatments-for-severe-influenza-requiring-hospitalization
#10
Ross L Peterson, David M Vock, John H Powers, Sean Emery, Eduardo Fernandez Cruz, Sally Hunsberger, Mamta K Jain, Sarah Pett, James D Neaton
Background/Aims A single best endpoint for evaluating treatments of severe influenza requiring hospitalization has not been identified. A novel six-category ordinal endpoint of patient status is being used in a randomized controlled trial (FLU-Intravenous Immunoglobulin - FLU-IVIG) of intravenous immunoglobulin. We systematically examine four factors regarding the use of this ordinal endpoint that may affect power from fitting a proportional odds model: (1) deviations from the proportional odds assumption which result in the same overall treatment effect as specified in the FLU-IVIG protocol and which result in a diminished overall treatment effect, (2) deviations from the distribution of the placebo group assumed in the FLU-IVIG design, (3) the effect of patient misclassification among the six categories, and (4) the number of categories of the ordinal endpoint...
March 1, 2017: Clinical Trials: Journal of the Society for Clinical Trials
https://www.readbyqxmd.com/read/28388315/a-simulation-based-sample-size-calculation-method-for-pre-clinical-tumor-xenograft-experiments
#11
Jianrong Wu, Shengping Yang
Pre-clinical tumor xenograft experiments usually require a small sample size that is rarely greater than 20, and data generated from such experiments very often do not have censored observations. Many statistical tests can be used for analyzing such data, but most of them were developed based on large sample approximation. We demonstrate that the type-I error rates of these tests can substantially deviate from the designated rate, especially when the data to be analyzed has a skewed distribution. Consequently, the sample size calculated based on these tests can be erroneous...
April 7, 2017: Journal of Biopharmaceutical Statistics
https://www.readbyqxmd.com/read/28384860/fungal-opportunistic-pneumonias-in-hiv-aids-patients-an-indian-tertiary-care-experience
#12
Ravinder Kaur, Bhanu Mehra, Megh Singh Dhakad, Ritu Goyal, Preena Bhalla, Richa Dewan
INTRODUCTION: Opportunistic pneumonias are a major cause of mortality and morbidity in Human Immunodeficiency Virus (HIV) reactive patients. Despite the significant role that fungi play in causation of this opportunistic mycoses, very few Indian studies have attempted to investigate the burden and aetiological spectrum of HIV/AIDS-associated fungal pneumonias. AIM: To document the prevalence of fungal aetiology in HIV/AIDS-related opportunistic pneumonias in an Indian setting; and to elucidate the various fungal opportunists responsible for the same...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28357529/differentiating-pheochromocytoma-from-lipid-poor-adrenocortical-adenoma-by-ct-texture-analysis-feasibility-study
#13
Gu-Mu-Yang Zhang, Bing Shi, Hao Sun, Zheng-Yu Jin, Hua-Dan Xue
OBJECTIVES: To investigate the feasibility of using CT texture analysis (CTTA) to differentiate pheochromocytoma from lipid-poor adrenocortical adenoma (lp-ACA). METHODS: Ninety-eight pheochromocytomas and 66 lp-ACAs were included in this retrospective study. CTTA was performed on unenhanced and enhanced images. Receiver operating characteristic (ROC) analysis was performed, and the area under the ROC curve (AUC) was calculated for texture parameters that were significantly different for the objective...
March 29, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28299958/a-model-of-self-monitoring-blood-glucose-measurement-error
#14
Martina Vettoretti, Andrea Facchinetti, Giovanni Sparacino, Claudio Cobelli
BACKGROUND: A reliable model of the probability density function (PDF) of self-monitoring of blood glucose (SMBG) measurement error would be important for several applications in diabetes, like testing in silico insulin therapies. In the literature, the PDF of SMBG error is usually described by a Gaussian function, whose symmetry and simplicity are unable to properly describe the variability of experimental data. Here, we propose a new methodology to derive more realistic models of SMBG error PDF...
March 1, 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28294687/twenty-two-years-of-u-s-meat-and-poultry-product-recalls-implications-for-food-safety-and-food-waste
#15
Acton Gorton, Matthew J Stasiewicz
The U.S. Department of Agriculture, Food Safety and Inspection Service maintains a recall case archive of meat and poultry product recalls from 1994 to the present. In this study, we collected all recall records from 1994 to 2015 and extracted the recall date, meat or poultry species implicated, reason for recall, recall class, and pounds of product recalled and recovered. Of a total of 1,515 records analyzed, the top three reasons for recall were contamination with Listeria, undeclared allergens, and Shiga toxin-producing Escherichia coli ...
March 15, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28288078/idiopathic-genu-valgum-and-its-association-with-obesity-in-children-and-adolescents
#16
Janet L Walker, Pooya Hosseinzadeh, Hank White, Kevin Murr, Todd A Milbrandt, Vishwas J Talwalkar, Henry Iwinski, Ryan Muchow
BACKGROUND: Obesity as a cause of lower extremity deformity in children has been well established. This deformity is most often seen as tibia vara, however, at our institution we have observed more obese children and adolescents over age 7 years with excessive or progressive idiopathic genu valgum. Our hypothesis is that children with idiopathic genu valgum have high rates of obesity which impact the severity of their disease. METHODS: Retrospective review of existing data was performed on 66 consecutive children/112 limbs over age 7 years with idiopathic genu valgum, seen from 2010 to 2013...
March 10, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28268479/early-warnings-of-heart-rate-deterioration
#17
Vania G Almeida, Ian T Nabney
Hospitals can experience difficulty in detecting and responding to early signs of patient deterioration leading to late intensive care referrals, excess mortality and morbidity, and increased hospital costs. Our study aims to explore potential indicators of physiological deterioration by the analysis of vital-signs. The dataset used comprises heart rate (HR) measurements from MIMIC II waveform database, taken from six patients admitted to the Intensive Care Unit (ICU) and diagnosed with severe sepsis. Different indicators were considered: 1) generic early warning indicators used in ecosystems analysis (autocorrelation at-1-lag (ACF1), standard deviation (SD), skewness, kurtosis and heteroskedasticity) and 2) entropy analysis (kernel entropy and multi scale entropy)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28264243/lumbar-disc-herniation-presented-with-contralateral-symptoms
#18
Pius Kim, Chang Il Ju, Hyeun Sung Kim, Seok Won Kim
OBJECTIVE: This study aimed to unravel the putative mechanism underlying the neurologic deficits contralateral to the side with lumbar disc herniation (LDH) and to elucidate the treatment for this condition. METHODS: From January 2009 to June 2015, 8 patients with LDH with predominantly contralateral neurologic deficits underwent surgical treatment on the side with LDH with or without decompressing the symptomatic side. A retrospective review of charts and radiological records of these 8 patients was performed...
March 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/28263629/auditory-spectral-versus-spatial-temporal-order-judgment-threshold-distribution-analysis
#19
Leah Fostick, Harvey Babkoff
Some researchers suggested that one central mechanism is responsible for temporal order judgments (TOJ), within and across sensory channels. This suggestion is supported by findings of similar TOJ thresholds in same modality and cross-modality TOJ tasks. In the present study, we challenge this idea by analyzing and comparing the threshold distributions of the spectral and spatial TOJ tasks. In spectral TOJ, the tones differ in their frequency ("high" and "low") and are delivered either binaurally or monaurally...
May 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28258739/analysis-of-ct-features-and-quantitative-texture-analysis-in-patients-with-lung-adenocarcinoma-a-correlation-with-egfr-mutations-and-survival-rates
#20
B Sacconi, M Anzidei, A Leonardi, F Boni, L Saba, R Scipione, M Anile, M Rengo, F Longo, M Bezzi, F Venuta, A Napoli, A Laghi, C Catalano
AIM: To investigate the correlation between conventional computed tomography (CT) features, quantitative texture analysis (QTA), epidermal growth factor receptor (EGFR) mutations, and survival rates in patients with lung adenocarcinoma. MATERIALS AND METHODS: Sixty-eight patients were evaluated for conventional CT features and QTA in this retrospective study. A multiple logistic regression analysis and receiver operating characteristics (ROC) curve analysis versus death and EGFR status was performed for CT features and QTA in order to assess correlation between CT features, QTA, EGFR mutations, and survival rates...
February 28, 2017: Clinical Radiology
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