Read by QxMD icon Read


Lin Li, Mary Cazzell, Olajide Babawale, Hanli Liu
Atlas-guided diffuse optical tomography (atlas-DOT) is a computational means to image changes in cortical hemodynamic signals during human brain activities. Graph theory analysis (GTA) is a network analysis tool commonly used in functional neuroimaging to study brain networks. Atlas-DOT has not been analyzed with GTA to derive large-scale brain connectivity/networks based on near-infrared spectroscopy (NIRS) measurements. We introduced an automated voxel classification (AVC) method that facilitated the use of GTA with atlas-DOT images by grouping unequal-sized finite element voxels into anatomically meaningful regions of interest within the human brain...
October 2016: Neurophotonics
Daniel Bos, Atefeh Bozorgpourniazi, Unal Mutlu, Maryam Kavousi, Meike W Vernooij, Adriaan Moelker, Oscar H Franco, Peter J Koudstaal, M Arfan Ikram, Aad van der Lugt
BACKGROUND AND PURPOSE: It remains uncertain whether aortic valve calcification (AVC) is a risk factor for stroke. METHODS: From the population-based Rotterdam Study, 2471 participants (mean age: 69.6 years; 51.8% women) underwent computed tomography to quantify AVC. We assessed prevalent stroke and continuously monitored the remaining participants for the incidence of stroke. Logistic and Cox regression models were used to investigate associations of AVC with prevalent stroke and risk of incident stroke...
October 13, 2016: Stroke; a Journal of Cerebral Circulation
Sotiris Avgousti, Andreas S Panayides, Antonis P Jossif, Eftychios G Christoforou, Pierre Vieyres, Cyril Novales, Sotos Voskarides, Constantinos S Pattichis
This Letter proposes an end-to-end mobile tele-echography platform using a portable robot for remote cardiac ultrasonography. Performance evaluation investigates the capacity of long-term evolution (LTE) wireless networks to facilitate responsive robot tele-manipulation and real-time ultrasound video streaming that qualifies for clinical practice. Within this context, a thorough video coding standards comparison for cardiac ultrasound applications is performed, using a data set of ten ultrasound videos. Both objective and subjective (clinical) video quality assessment demonstrate that H...
September 2016: Healthcare Technology Letters
Yohei Shibata, Hideki Ishii, Susumu Suzuki, Akihito Tanaka, Yosuke Tatami, Shingo Harata, Tomoyuki Ota, Yusaku Shimbo, Yohei Takayama, Ayako Kunimura, Kenshi Hirayama, Kazuhiro Harada, Naohiro Osugi, Toyoaki Murohara
AIMS: Previous studies have shown that aortic valve calcification (AVC) was associated with cardiovascular events and mortality. On the other hand, periprocedural myocardial injury (PMI) in percutaneous coronary intervention (PCI) is a well-known predictor of subsequent mortality and poor clinical outcomes. The purpose of the study was to assess the hypothesis that the presence of AVC could predict PMI in PCI. METHODS: This study included 370 patients treated with PCI for stable angina pectoris...
October 13, 2016: Journal of Atherosclerosis and Thrombosis
Francesco Aggogeri, Alberto Borboni, Angelo Merlo, Nicola Pellegrini, Raffaele Ricatto
This paper proposes an innovative mechatronic piezo-actuated module to control vibrations in modern machine tools. Vibrations represent one of the main issues that seriously compromise the quality of the workpiece. The active vibration control (AVC) device is composed of a host part integrated with sensors and actuators synchronized by a regulator; it is able to make a self-assessment and adjust to alterations in the environment. In particular, an innovative smart actuator has been designed and developed to satisfy machining requirements during active vibration control...
2016: Sensors
A A Sakrana, M M Nasr, G A Ashamallah, R A Abuelatta, H A Naeim, M E Tahlawi
AIM: To investigate the determinants of paravalvular leak (PVL) occurring after transcatheter aortic valve implantation (TAVI). MATERIALS AND METHODS: One hundred and eight patients with severe symptomatic aortic stenosis (mean age 75.5±11.8 years, 72.2% male) underwent contrast-enhanced electrocardiogram (ECG)-gated multidetector computed tomography (MDCT) then successful TAVI. The following parameters were determined in the late systolic phase: annular and left ventricular outflow tract (LVOT) diameters, annular perimeter, ellipticity index, annular area, indexed annular area, LVOT perimeter, annulus/LVOT perimeter difference ratio, the LVOT to ascending aorta angle (< LVOT-AO)...
November 2016: Clinical Radiology
Andrea Mafficini, Eliana Amato, Ivana Cataldo, Borislav C Rusev, Luca Bertoncello, Vincenzo Corbo, Michele Simbolo, Claudio Luchini, Matteo Fassan, Cinzia Cantù, Roberto Salvia, Giovanni Marchegiani, Giampaolo Tortora, Rita T Lawlor, Claudio Bassi, Aldo Scarpa
OBJECTIVE: To identify molecular prognostic factors and potentially actionable mutations in ampulla of Vater cancer (AVC). BACKGROUND: The largely variable outcomes of AVCs make clinical decisions difficult regarding the need of postsurgical therapy, which is based on morphological and immunohistochemical classification that do not adequately consider the varying degrees of heterogeneity present in many AVCs. No approved targeted therapies for AVC exist, but some show promising results requiring better molecular characterization to identify potential responders...
September 8, 2016: Annals of Surgery
Keisuke Minami, Kihei Yoneyama, Masaki Izumo, Kengo Suzuki, Yasuyoshi Ogawa, Kousuke Chikaraishi, Yukihisa Ogawa, Yasuyuki Kobayashi, Toshiyuki Furukawa, Yasuhiro Tanabe, Yoshihiro J Akashi
BACKGROUND: Computed tomography is the best noninvasive imaging modality for evaluating valve leaflet calcification. OBJECTIVE: To evaluate the association of aortic valve leaflet calcification with instantaneous valve opening and closing using dynamic multidetector computed tomography (MDCT). METHODS: We retrospectively evaluated 58 consecutive patients who underwent dynamic MDCT imaging. Aortic valve calcification (AVC) was quantified using the Agatston method...
August 23, 2016: Journal of Cardiovascular Computed Tomography
Robbert Willem van Hamersvelt, Annemarie M den Harder, Martin J Willemink, Arnold M R Schilham, Jan-Willem J Lammers, Hendrik M Nathoe, Ricardo P J Budde, Tim Leiner, Pim A de Jong
OBJECTIVE: This study aimed to determine the lowest radiation dose and iterative reconstruction level(s) at which computed tomography (CT)-based quantification of aortic valve calcification (AVC) and thoracic aortic calcification (TAC) is still feasible. METHODS: Twenty-eight patients underwent a cardiac CT and 20 patients a chest CT at 4 different dose levels (routine dose and approximately 40%, 60%, and 80% reduced dose). Data were reconstructed with filtered back projection, 3 iDose levels, and 3 iterative model-based reconstruction levels...
August 25, 2016: Journal of Computer Assisted Tomography
Swapnalee Sarmah, Pooja Muralidharan, James A Marrs
Fetal alcohol spectrum disorder (FASD), birth defects associated with ethanol exposure in utero, includes a wide spectrum of congenital heart defects (CHDs), the most prevalent of which are septal and conotruncal defects. Zebrafish FASD model was used to dissect the mechanisms underlying FASD-associated CHDs. Embryonic ethanol exposure (3-24 hours post fertilization) led to defects in atrio-ventricular (AV) valvulogenesis beginning around 37 hpf, a morphogenetic event that arises long after ethanol withdrawal...
2016: PloS One
Ayrton R Massaro, Gregory Y H Lippp
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia, with an estimated prevalence of 1-2% in North America and Europe. The increased prevalence of AF in Latin America is associated with an ageing general population, along with poor control of key risk factors, including hypertension. As a result, stroke prevalence and associated mortality have increased dramatically in the region. Therefore, the need for effective anticoagulation strategies in Latin America is clear. The aim of this review is to provide a contemporary overview of anticoagulants for stroke prevention...
August 11, 2016: Arquivos Brasileiros de Cardiologia
Talal S Alnabelsi, Yaser Alhamshari, Ramzi H Mulki, Jose N Codolosa, Nikoloz Koshkelashvili, Igor Goykhman, Gregg S Pressman, Abel Romero-Corral
Epicardial adipose tissue (EAT) has been linked to coronary artery calcium deposits and atherosclerotic disease. Mitral annular (MAC) and aortic valve calcium (AVC) have also been associated with atherosclerosis. This study examined the possible relation between EAT thickness and valvular calcium deposits. We included 294 patients aged ≥65 years who had noncontrast computed tomography scans of the chest. Mean age was 76 ± 7 years; 47% were men. Using reconstructed images, EAT thickness was measured at various locations...
October 1, 2016: American Journal of Cardiology
Alexander Bulk, David Bark, Brennan Johnson, Deborah Garrity, Lakshmi Prasad Dasi
Normal development of the heart is regulated, in part, by mechanical influences associated with blood flow during early stages of embryogenesis. Specifically, the potential for retrograde flow at the atrioventricular canal (AVC) is particularly important in valve development. However, the mechanisms causing this retrograde flow have received little attention. In this study, a numerical analysis was performed on images of the embryonic zebrafish heart between 48 and 55hpf. During these stages, normal retrograde flow is prevalent...
July 30, 2016: Journal of Biomechanics
J Bastos, A Araújo, J Pires, J Pinto, P Almeida, J Polonia
OBJECTIVE: HASH(0x461c488) AIM: It is not well known if systolic white coat effect (WCE), the difference between casual systolic blood pressure (SBPc) and daytime systolic blood pressure determined by ambulatory blood pressure (ABPM), is a marker or not of worst cardiovascular events (CV).The aim of the study was to evaluate the prognostic value of white coat effect in relation to cardiovascular events (CV) stroke (AVC) and coronary events (DC). DESIGN AND METHOD: Casual and ABP were obtained in 1200 hypertensive patients (645 female) age 51 ± 12 years, BMI 27 ± 5 Kg/m2, SBPc 154...
September 2016: Journal of Hypertension
Mylène Shen, Lionel Tastet, Romain Capoulade, Éric Larose, Élisabeth Bédard, Marie Arsenault, Philippe Chetaille, Jean G Dumesnil, Patrick Mathieu, Marie-Annick Clavel, Philippe Pibarot
OBJECTIVE: To evaluate the effect of age and aortic valve anatomy (tricuspid (TAV) vs bicuspid (BAV) aortic valve) on the relationship between the aortic valve calcification (AVC) and the haemodynamic parameters of aortic stenosis (AS) severity. METHODS: Two hundred patients with AS and preserved left ventricular ejection fraction were prospectively recruited in the PROGRESSA (Metabolic Determinants of the Progression of Aortic Stenosis) study and underwent a comprehensive Doppler echocardiography and multidetector CT (MDCT)...
August 8, 2016: Heart: Official Journal of the British Cardiac Society
Hatice Sevil Avc, Nimet Ovayolu, Özlem Ovayolu
The aim of this study was to assess the effect of acupressure, applied at P6 (Neiguan) acupuncture point, on chemotherapy-induced nausea and vomiting in patients with acute myeloblastic leukemia. This was a randomized controlled trial conducted on patients with myeloblastic leukemia. A total of 90 patients, who received the same chemotherapy regimen and antiemetic therapy, were included in the study as 30 patients in the control group, 30 patients in the band group, and 30 patients in the pressure group. Although acupressure was applied by placing wristbands at P6 acupuncture point of both wrists in patients of the band group for totally 4 days, acupressure was applied with the use of finger pressure in patients of the pressure group for totally 4 days...
September 2016: Holistic Nursing Practice
Abid Qureshi, Gazaldeep Kaur, Manoj Kumar
Viral infections constantly jeopardize the global public health due to lack of effective antiviral therapeutics. Therefore, there is an imperative need to speed up the drug discovery process to identify novel and efficient drug candidates. In the present study, we have developed Quantitative structure-activity relationship (QSAR) based models for predicting Antiviral compounds (AVCs) against deadly viruses like Human immunodeficiency virus (HIV), Hepatitis C virus (HCV), Hepatitis B virus (HBV), Human herpesvirus (HHV) and 26 others using publicly available experimental data from the ChEMBL bioactivity database...
August 4, 2016: Chemical Biology & Drug Design
Wenrui Dai, Yangmei Shen, Xin Tang, Junni Zou, Hongkai Xiong, Chang Wen Chen
Classical dictionary learning methods for video coding suer from high computational complexity and interfered coding eciency by disregarding its underlying distribution. This paper proposes a spatio-temporal online dictionary learning (STOL) algorithm to speed up the convergence rate of dictionary learning with a guarantee of approximation error. The proposed algorithm incorporates stochastic gradient descents to form a dictionary of pairs of 3-D low-frequency and highfrequency spatio-temporal volumes. In each iteration of the learning process, it randomly selects one sample volume and updates the atoms of dictionary by minimizing the expected cost, rather than optimizes empirical cost over the complete training data like batch learning methods, e...
July 27, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
Anna E Bortnick, Traci M Bartz, Joachim H Ix, Michel Chonchol, Alexander Reiner, Mary Cushman, David Owens, Eddy Barasch, David S Siscovick, John S Gottdiener, Jorge R Kizer
OBJECTIVE: Calcification of the aortic valve and adjacent structures involves inflammatory, lipid and mineral metabolism pathways. We hypothesised that circulating biomarkers reflecting these pathways are associated with cardiac calcification in older adults. METHODS: We investigated the associations of various biomarkers with valvular and annular calcification in the Cardiovascular Health Study. Of the 5888 participants, up to 3585 were eligible after exclusions for missing biomarker, covariate or echocardiographic data...
July 13, 2016: Heart: Official Journal of the British Cardiac Society
Hui Xu, Xiao-Jun Tong, Miao Zhang, Zhu Wang, Ling-Hao Li
Video encryption schemes mostly employ the selective encryption method to encrypt parts of important and sensitive video information, aiming to ensure the real-time performance and encryption efficiency. The classic block cipher is not applicable to video encryption due to the high computational overhead. In this paper, we propose the encryption selection control module to encrypt video syntax elements dynamically which is controlled by the chaotic pseudorandom sequence. A novel spatiotemporal chaos system and binarization method is used to generate a key stream for encrypting the chosen syntax elements...
June 1, 2016: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"