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https://www.readbyqxmd.com/read/27913363/detecting-breathing-and-snoring-episodes-using-a-wireless-tracheal-sensor-a-feasibility-study
#1
Marcel Mlynczak, Ewa Migacz, Maciej Migacz, Wojciech Kukwa
OBJECTIVE: Sleep-disordered breathing is both a clinical and a social problem. This implies the need for convenient solutions to simplify screening and diagnosis. The aim of the study was to investigate the sensitivity and specificity of a novel wireless system in detecting breathing and snoring episodes during sleep. METHODS: A wireless acoustic sensor was elaborated and implemented. Segmentation (based on spectral thresholding and heuristics) and classification of all breathing episodes during recording were implemented through a mobile application...
November 29, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/27912204/incremental-diagnostic-value-of-combined-quantitative-and-qualitative-parameters-of-magnetocardiography-to-detect-coronary-artery-disease
#2
Eun-Seok Shin, Yat-Yin Lam, Ae-Young Her, Johannes Brachmann, Friedrich Jung, Jai-Wun Park
BACKGROUND/OBJECTIVES: Magnetocardiography (MCG) has been proposed as a non-invasive and functional technique with high accuracy for diagnosis of myocardial ischemia. This study sought to investigate the incremental diagnostic value of combined quantitative and qualitative parameters of MCG to detect coronary artery disease (CAD). METHODS: Ninety six patients with suspected CAD who underwent coronary angiography were enrolled in the analysis to test the diagnostic accuracy of 2 MCG parameters (a quantitative parameter of the percent change of ST-segment fluctuation score and a qualitative parameter of non-dipole phenomenon)...
November 9, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27911353/computer-aided-classification-of-mammographic-masses-using-visually-sensitive-image-features
#3
Yunzhi Wang, Faranak Aghaei, Ali Zarafshani, Yuchen Qiu, Wei Qian, Bin Zheng
PURPOSE: To develop a new computer-aided diagnosis (CAD) scheme that computes visually sensitive image features routinely used by radiologists to develop a machine learning classifier and distinguish between the malignant and benign breast masses detected from digital mammograms. METHODS: An image dataset including 301 breast masses was retrospectively selected. From each segmented mass region, we computed image features that mimic five categories of visually sensitive features routinely used by radiologists in reading mammograms...
November 30, 2016: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/27909886/automatic-snoring-sounds-detection-from-sleep-sounds-via-multi-features-analysis
#4
Can Wang, Jianxin Peng, Lijuan Song, Xiaowen Zhang
Obstructive sleep apnea hypopnea syndrome (OSAHS) is a serious respiratory disorder. Snoring is the most intuitively characteristic symptom of OSAHS. Recently, many studies have attempted to develop snore analysis technology for diagnosing OSAHS. The preliminary and essential step in such diagnosis is to automatically segment snoring sounds from original sleep sounds. This study presents an automatic snoring detection algorithm that detects potential snoring episodes using an adaptive effective-value threshold method, linear and nonlinear feature extraction using maximum power ratio, sum of positive/negative amplitudes, 500 Hz power ratio, spectral entropy (SE) and sample entropy (SampEn), and automatic snore/nonsnore classification using a support vector machine...
December 1, 2016: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/27909801/increasing-the-sensitivity-of-mri-for-the-detection-of-multiple-sclerosis-lesions-by-long-axial-coverage-of-the-spinal-cord-a-prospective-study-in-119-patients
#5
Michael O Breckwoldt, Johann Gradl, Stefan Hähnel, Thomas Hielscher, Brigitte Wildemann, Ricarda Diem, Michael Platten, Wolfgang Wick, Sabine Heiland, Martin Bendszus
Diagnostic imaging criteria of multiple sclerosis (MS) include the spatial and temporal dissemination of cerebral and/or spinal cord lesions. Magnetic resonance imaging (MRI) is the method of choice for initial diagnosis and follow-up disease monitoring. Current guidelines for spinal MRI recommend sagittal imaging of the spinal cord and lesion confirmation on axial planes if lesions are detected. Sagittal imaging is, however, hampered by technical (e.g. partial volume effects, motion artifacts) and anatomical (e...
December 1, 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27908171/automated-detection-of-white-matter-hyperintensities-of-all-sizes-in-cerebral-small-vessel-disease
#6
Mohsen Ghafoorian, Nico Karssemeijer, Inge W M van Uden, Frank-Erik de Leeuw, Tom Heskes, Elena Marchiori, Bram Platel
PURPOSE: White matter hyperintensities (WMH) are seen on FLAIR-MRI in several neurological disorders, including multiple sclerosis, dementia, Parkinsonism, stroke and cerebral small vessel disease (SVD). WMHs are often used as biomarkers for prognosis or disease progression in these diseases, and additionally longitudinal quantification of WMHs is used to evaluate therapeutic strategies. Human readers show considerable disagreement and inconsistency on detection of small lesions. A multitude of automated detection algorithms for WMHs exists, but since most of the current automated approaches are tuned to optimize segmentation performance according to Jaccard or Dice scores, smaller WMHs often go undetected in these approaches...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908154/mass-detection-in-digital-breast-tomosynthesis-deep-convolutional-neural-network-with-transfer-learning-from-mammography
#7
Ravi K Samala, Heang-Ping Chan, Lubomir Hadjiiski, Mark A Helvie, Jun Wei, Kenny Cha
PURPOSE: Develop a computer-aided detection (CAD) system for masses in digital breast tomosynthesis (DBT) volume using a deep convolutional neural network (DCNN) with transfer learning from mammograms. METHODS: A data set containing 2282 digitized film and digital mammograms and 324 DBT volumes were collected with IRB approval. The mass of interest on the images was marked by an experienced breast radiologist as reference standard. The data set was partitioned into a training set (2282 mammograms with 2461 masses and 230 DBT views with 228 masses) and an independent test set (94 DBT views with 89 masses)...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908083/perceptual-thresholds-for-non-ideal-diffuse-field-reverberation
#8
David Romblom, Catherine Guastavino, Philippe Depalle
The objective of this study is to understand listeners' sensitivity to directional variations in non-ideal diffuse field reverberation. An ABX discrimination test was conducted using a semi-spherical 28-loudspeaker array; perceptual thresholds were estimated by systematically varying the level of a segment of loudspeakers for lateral, height, and frontal conditions. The overall energy was held constant using a gain compensation scheme. When compared to an ideal diffuse field, the perceptual threshold for detection is -2...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27908038/phonetic-imitation-of-coarticulatory-vowel-nasalization
#9
Georgia Zellou, Rebecca Scarborough, Kuniko Nielsen
This study investigates the spontaneous phonetic imitation of coarticulatory vowel nasalization. Speakers produced monosyllabic words with a vowel-nasal sequence either from dense or sparse phonological neighborhoods in shadowing and word-naming tasks. During shadowing, they were exposed to target words that were modified to have either an artificially increased or decreased degree of coarticulatory vowel nasality. Increased nasality, which is communicatively more facilitative in that it provides robust predictive information about the upcoming nasal segment, was imitated more strongly during shadowing than decreased nasality...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27907080/development-of-an-automated-mri-based-diagnostic-protocol-for-amyotrophic-lateral-sclerosis-using-disease-specific-pathognomonic-features-a-quantitative-disease-state-classification-study
#10
Christina Schuster, Orla Hardiman, Peter Bede
BACKGROUND: Despite significant advances in quantitative neuroimaging, the diagnosis of ALS remains clinical and MRI-based biomarkers are not currently used to aid the diagnosis. The objective of this study is to develop a robust, disease-specific, multimodal classification protocol and validate its diagnostic accuracy in independent, early-stage and follow-up data sets. METHODS: 147 participants (81 ALS patients and 66 healthy controls) were divided into a training sample and a validation sample...
2016: PloS One
https://www.readbyqxmd.com/read/27905975/health-profile-of-centenarians-in-portugal-a-census-based-approach
#11
Oscar Ribeiro, Laetitia Teixeira, Lia Araújo, Constança Paúl
BACKGROUND: The number of centenarians is rapidly increasing in Europe. In Portugal, it has almost tripled over the last 10 years and constitutes one of the fastest-growing segments of the population. This paper aims to describe the health and sociodemographic characteristics of Portuguese centenarians as given in the 2011 census and to identify sex differences. METHODS: All persons living in Portugal mainland and Madeira and Azores islands aged 100 years old at the time of the 2011 census (N = 1,526) were considered...
April 12, 2016: Population Health Metrics
https://www.readbyqxmd.com/read/27903345/-application-of-low-dose-ct-angiography-with-70-kv-in-patients-with-peripheral-arterial-diseases
#12
Y H Duan, G M Lu, J Wu, X C Yang, D D Wu, Z P Cheng, X M Wang
Objective: To assess the image quality, radiation dose and diagnostic efficiency of peripheral arterial CT angiography (CTA) performed at tube voltage of 70 and 120 kV. Methods: Between January 2014 and December 2015, a total of 200 consecutive patients with known or suspected lower extremity arteriosclerosis obliterans (LEASO) underwent CTA.Patients were randomly divided into 2 groups by different scanning protocols.Group A (n=100): 70 kV and 0.8 ml/kg contrast agent, group B (n=100): 120 kV and 100 ml contrast agent...
November 22, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/27902859/evaluation-of-velocity-sensitized-and-acceleration-sensitized-nce-mra-for-below-knee-peripheral-arterial-disease
#13
Nadeem Shaida, Andrew N Priest, T C See, Andrew P Winterbottom, Martin J Graves, David J Lomas
PURPOSE: To evaluate the diagnostic performance of velocity- and acceleration-sensitized noncontrast-enhanced magnetic resonance angiography (NCE-MRA) of the infrageniculate arteries using contrast-enhanced MRA (CE-MRA) as a reference standard. MATERIALS AND METHODS: Twenty-four patients with symptoms of peripheral arterial disease were recruited. Each patient's infrageniculate arterial tree was examined using a velocity-dependent flow-sensitized dephasing (VEL-FSD) technique, an acceleration-dependent (ACC-FSD) technique, and our conventional CE-MRA technique performed at 1...
November 30, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27899851/cutoff-value-of-admission-n-terminal-pro-brain-natriuretic-peptide-which-predicts-poor-myocardial-perfusion-after-primary-percutaneous-coronary-intervention-for-st-segment-elevation-myocardial-infarction
#14
Khairy Abdel-Dayem, Inas I Eweda, Ashraf El-Sherbiny, Marc O Dimitry, Wail Nammas
BACKGROUND: We explored the value of admission levels of N-terminal pro-brain natriuretic peptide (NTProBNP) that best predicts poor myocardial tissue perfusion following primary percutaneous coronary intervention (PPCI) in patients admitted with acute ST-segment-elevation myocardial infarction (STEMI). METHODS: We enrolled 90 consecutive patients admitted with acute STEMI who underwent PPCI and achieved post-procedural TIMI flow grade 3 in the infarct-related artery...
November 2016: Acta Cardiologica Sinica
https://www.readbyqxmd.com/read/27895429/potential-model-for-differential-diagnosis-between-crohn-s-disease-and-primary-intestinal-lymphoma
#15
Tian-Yu Zhang, Yun Lin, Rong Fan, Shu-Rong Hu, Meng-Meng Cheng, Mao-Chen Zhang, Li-Wen Hong, Xiao-Lin Zhou, Zheng-Ting Wang, Jie Zhong
AIM: To evaluate the usefulness of different parameters to differentiate Crohn's disease (CD) from primary intestinal lymphoma (PIL). METHODS: The medical records of 85 patients with CD and 56 patients with PIL were reviewed retrospectively. Demographic, clinical, laboratory, endoscopic, and computed tomographic enterography (CTE) parameters were collected. The univariate value of each parameter was analyzed. A differentiation model was established by pooling all the valuable parameters...
November 14, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/27895353/bacterobilia-in-acute-cholecystitis-bile-cultures-isolates-antibiotic-sensitivities-and-antibiotic-usage-a-study-on-a-pakistani-population
#16
Yousaf Bashir Hadi, Muhammad Waqas, Hafiz Muhammad Umer, Ammar Alam, Abdul Rehman Alvi, Muhammad Rizwan Khan
Acute cholecystitis is one of the most common acute surgical conditions. Laparoscopic cholecystectomy remains the mainstay of treatment. In patients managed non-operatively, antibiotics play an important role in the treatment of cholecystitis. The current retrospective observational study was conducted at a tertiary care hospital in Karachi, and comprised medical records of patients admitted between 2008 and 2014with acute cholecystitis and in whom bile cultures were obtained. Of the 509 patients with a mean age of 51...
October 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/27894261/multimarker-approach-for-the-prediction-of-microvascular-obstruction-after-acute-st-segment-elevation-myocardial-infarction-a-prospective-observational-study
#17
Hans-Josef Feistritzer, Sebastian Johannes Reinstadler, Gert Klug, Martin Reindl, Sebastian Wöhrer, Christoph Brenner, Agnes Mayr, Johannes Mair, Bernhard Metzler
BACKGROUND: Presence of microvascular obstruction (MVO) derived from cardiac magnetic resonance (CMR) imaging is among the strongest outcome predictors after ST-segment elevation myocardial infarction (STEMI). We aimed to investigate the comparative predictive values of different biomarkers for the occurrence of MVO in a large cohort of reperfused STEMI patients. METHODS: This study included 128 STEMI patients. CMR imaging was performed within the first week after infarction to assess infarct characteristics, including MVO...
November 28, 2016: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/27893566/validity-and-reliability-of-a-portable-balance-tracking-system-btracks-in-older-adults
#18
Susan S Levy, Katie J Thralls, Shiloah A Kviatkovsky
BACKGROUND AND PURPOSE: Falls are the leading cause of disability, injury, hospital admission, and injury-related death among older adults. Balance limitations have consistently been identified as predictors of falls and increased fall risk. Field measures of balance are limited by issues of subjectivity, ceiling effects, and low sensitivity to change. The gold standard for measuring balance is the force plate; however, its field use is untenable due to high cost and lack of portability...
November 23, 2016: Journal of Geriatric Physical Therapy
https://www.readbyqxmd.com/read/27893380/area-determination-of-diabetic-foot-ulcer-images-using-a-cascaded-two-stage-svm-based-classification
#19
Lei Wang, Peder Pedersen, Emmanuel Agu, Diane Strong, Bengisu Tulu
It is standard practice for clinicians and nurses to primarily assess patients' wounds via visual examination. This subjective method can be inaccurate in wound assessment and also represents a significant clinical workload. Hence, computer-based systems, especially implemented on mobile devices, can provide automatic, quantitative wound assessment and can thus be valuable for accurately monitoring wound healing status. Out of all wound assessment parameters, the measurement of the wound area is the most suitable for automated analysis...
November 23, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27889567/prognostic-value-of-plasma-apelin-concentrations-at-admission-in-patients-with-st-segment-elevation-acute-myocardial-infarction
#20
Jordi Sans-Roselló, Gregori Casals, Xavier Rosselló, Bernardino González de la Presa, Montserrat Vila, Albert Duran-Cambra, Manuel Morales-Ruiz, Andreu Ferrero-Gregori, Wladimiro Jiménez, Alessandro Sionis
BACKGROUND: The use of plasma biomarkers is relevant for the prognosis of ST-segment elevation myocardial infarction (STEMI) patients. Apelin, an adipocytokine, plays a pivotal role in the pathophysiology of both ischemia/reperfusion injury and its potential subsequent heart failure. We evaluated apelin concentrations at admission as a biomarker to assess risk of 6-month mortality. METHODS: Consecutive patients with STEMI were recruited from January 2012 to January 2013 (n=250)...
November 23, 2016: Clinical Biochemistry
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