keyword
MENU ▼
Read by QxMD icon Read
search

f wave

keyword
https://www.readbyqxmd.com/read/28431066/limited-left-atrial-surgical-ablation-effectively-treats-atrial-fibrillation-but-decreases-left-atrial-function
#1
Marieke G Compier, Laurens F Tops, Jerry Braun, Katja Zeppenfeld, Robert J Klautz, Martin J Schalij, Serge A Trines
Aims: Limited left atrial (LA) surgical ablation with bipolar radiofrequency is considered to be an effective procedure for treatment of atrial fibrillation (AF). We studied whether limited LA surgical ablation concomitant to cardiac surgery is able to maintain LA function. Methods and Results: Thirty-six consecutive patients (age 66 ± 12 years, 53% male, 78% persistent AF) scheduled for valve surgery and/or coronary revascularization and concomitant LA surgical ablation were included...
April 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28430520/wind-generated-rogue-waves-in-an-annular-wave-flume
#2
A Toffoli, D Proment, H Salman, J Monbaliu, F Frascoli, M Dafilis, E Stramignoni, R Forza, M Manfrin, M Onorato
We investigate experimentally the statistical properties of a wind-generated wave field and the spontaneous formation of rogue waves in an annular flume. Unlike many experiments on rogue waves where waves are mechanically generated, here the wave field is forced naturally by wind as it is in the ocean. What is unique about the present experiment is that the annular geometry of the tank makes waves propagating circularly in an unlimited-fetch condition. Within this peculiar framework, we discuss the temporal evolution of the statistical properties of the surface elevation...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28430470/parametrically-tunable-soliton-induced-resonant-radiation-by-three-wave-mixing
#3
B B Zhou, X Liu, H R Guo, X L Zeng, X F Chen, H P Chung, Y H Chen, M Bache
We show that a temporal soliton can induce resonant radiation by three-wave mixing nonlinearities. This constitutes a new class of resonant radiation whose spectral positions are parametrically tunable. The experimental verification is done in a periodically poled lithium niobate crystal, where a femtosecond near-IR soliton is excited and resonant radiation waves are observed exactly at the calculated soliton phase-matching wavelengths via the sum- and difference-frequency generation nonlinearities. This extends the supercontinuum bandwidth well into the mid IR to span 550-5000 nm, and the mid-IR edge is parametrically tunable over 1000 nm by changing the three-wave mixing phase-matching condition...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28429850/association-of-obstructive-sleep-apnea-with-arterial-stiffness-and-nondipping-blood-pressure-in-patients-with-hypertension
#4
Raimundo Jenner, Fernanda Fatureto-Borges, Valéria Costa-Hong, Heno F Lopes, Sandra H Teixeira, Elias Marum, Dante A M Giorgi, Fernanda M Consolim-Colombo, Luiz A Bortolotto, Geraldo Lorenzi-Filho, Eduardo M Krieger, Luciano F Drager
Whether sex influences the association of obstructive sleep apnea (OSA) with markers of cardiovascular risk in patients with hypertension is unknown. In this study, 95 hypertensive participants underwent carotid-femoral pulse wave velocity, 24-hour ambulatory blood pressure monitoring, echocardiogram, and polysomnography after a 30-day standardized treatment with hydrochlorothiazide plus enalapril or losartan. OSA was present in 52 patients. Compared with non-OSA patients, pulse wave velocity values were higher in the OSA group (men: 11...
April 21, 2017: Journal of Clinical Hypertension
https://www.readbyqxmd.com/read/28429754/real-time-detection-of-tsunami-ionospheric-disturbances-with-a-stand-alone-gnss-receiver-a-preliminary-feasibility-demonstration
#5
Giorgio Savastano, Attila Komjathy, Olga Verkhoglyadova, Augusto Mazzoni, Mattia Crespi, Yong Wei, Anthony J Mannucci
It is well known that tsunamis can produce gravity waves that propagate up to the ionosphere generating disturbed electron densities in the E and F regions. These ionospheric disturbances can be studied in detail using ionospheric total electron content (TEC) measurements collected by continuously operating ground-based receivers from the Global Navigation Satellite Systems (GNSS). Here, we present results using a new approach, named VARION (Variometric Approach for Real-Time Ionosphere Observation), and estimate slant TEC (sTEC) variations in a real-time scenario...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28429537/preliminary-findings-on-the-safety-of-1-5-and-3-tesla-magnetic-resonance-imaging-in-cardiac-pacemaker-patients
#6
V F van Dijk, P P H M Delnoy, J J J Smit, R A Ramdat Misier, A Elvan, H W van Es, B J W M Rensing, G Raciti, L V A Boersma
INTRODUCTION: Modern pacemakers are designed to allow patients to undergo Magnetic Resonance Imaging(MRI) under a set of specific conditions. Aim of this study is to provide confirmatory evidence of safety and performance of a new pacing system (ImageReady™, Boston Scientific) in patients undergoing 1.5 and 3 Tesla(T) MRI. METHODS AND RESULTS: Two prospective, non-randomized, single-arm studies were designed to provide confirmatory data of no impact of MRI on device function, lead parameters and patient conditions in subjects implanted with the system undergoing a clinically non-indicated 1...
April 21, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28427378/assessment-of-cardiac-function-in-children-with-congenital-adrenal-hyperplasia-a-case-control-study-in-cameroon
#7
J Tony Nengom, S Sap Ngo Um, D Chelo, R Mbono Betoko, J Boombhi, F Mouafo Tambo, A Chiabi, S Kingue, P Koki Ndombo
BACKGROUND: High level of androgens found in congenital adrenal hyperplasia (CAH) seems to have a deleterious effect on heart function. We therefore evaluate cardiac function of children with CAH in comparison with a healthy group. METHODS: We carried out a case-control study in the single endocrinology unit of the Mother and Child Center of Chantal Biya's Foundation. Cases were matched for age and genotypic sex to 2 healthy controls. We analyzed the ejection fraction (LVEF), fractional shortening and left ventricular mass; output and cardiac index; E and A waves velocities, E/A ratio and the mitral deceleration time and diameter of the left atrium; tricuspid annular plane systolic excursion and pulmonary artery systolic pressure were also measured...
April 20, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/28426437/supersonic-transient-magnetic-resonance-elastography-for-quantitative-assessment-of-tissue-elasticity
#8
Yu Liu, Jingfei Liu, Brett Z Fite, Josquin Foiret, Asaf Ilovitsh, J Kent Leach, Erik Dumont, Charles F Caskey, Katherine W Ferrara
Non-invasive, quantitative methods to assess the properties of biological tissues are needed for many therapeutic and tissue engineering applications. Magnetic resonance elastography (MRE) has historically relied on external vibration to generate periodic shear waves. In order to focally assess a biomaterial or to monitor the response to ablative therapy, the interrogation of a specific region of interest by a focused beam is desirable and transient MRE (t-MRE) techniques have previously been developed to accomplish this goal...
April 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28426196/chiral-inorganic-nanostructures
#9
Wei Ma, Liguang Xu, André F de Moura, Xiaoling Wu, Hua Kuang, Chuanlai Xu, Nicholas A Kotov
The field of chiral inorganic nanostructures is rapidly expanding. It started from the observation of strong circular dichroism during the synthesis of simple nanoparticles (NPs) and their assemblies mediated by biomolecules and expanded to sophisticated synthetic protocols involving nanostructures from metals, semiconductors, ceramics, and nanocarbons. Besides the well-established chirality transfer from bioorganic molecules, other methods to impart handedness to nanoscale matter specific to inorganic materials were discovered, including three-dimentional lithography, multiphoton chirality transfer, polarization effects in nanoscale assemblies, and others...
April 20, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28423119/importance-of-serca2a-on-early-isolated-diastolic-dysfunction-induced-by-supravalvular-aortic-stenosis-in-rats
#10
C F S M P Silveira, D H S Campos, P P Freire, A F Deus, K Okoshi, C R Padovani, A C Cicogna
Cardiac remodeling is defined as changes in shape and function of the heart in response to aggression (pressure overload). The sarcoplasmic reticulum calcium ATPase cardiac isoform 2a (SERCA2a) is a known factor that influences function. A wide spectrum of studies report a decrease in SERCA2a in heart failure, but none evaluate it's the role in early isolated diastolic dysfunction in supravalvular aortic stenosis (AoS). Our hypothesis was that SERCA2a participates in such dysfunction. Thirty-day-old male Wistar rats (60-80 g) were divided into AoS and Sham groups, which were submitted to surgery with or without aorta clipping, respectively...
April 13, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28422416/clot-wave-analysis-and-thromboembolic-score-in-liver-cirrhosis-two-opposing-phenomena
#11
M F Ruberto, O Sorbello, A Civolani, D Barcellona, L Demelia, F Marongiu
INTRODUCTION: Prothrombin time (PT) and activated partial thromboplastin time (aPTT) are abnormal but unreliable in cirrhotic patients to express their risk of bleeding. However, these patients may also suffer from thrombotic episodes. In order to investigate the dynamics of the formation of fibrin, the clot waveform analysis (CWA) of aPTT was studied together with a score for the evaluation of the thromboembolic risk. METHODS: CWA in terms of velocity (1st derivative), acceleration (2nd derivatives) and density (Delta) of aPTT and the Padua Prediction Score (PPS) for venous thromboembolism were studied in 191 cirrhotic patients...
April 19, 2017: International Journal of Laboratory Hematology
https://www.readbyqxmd.com/read/28422135/genomic-evidence-of-hybridization-between-two-independent-invasions-of-european-green-crab-carcinus-maenas-in-the-northwest-atlantic
#12
N W Jeffery, C DiBacco, B F Wringe, R R E Stanley, L C Hamilton, P N Ravindran, I R Bradbury
Invasive species have been associated with significant negative impacts in their introduced range often outcompeting native species, yet the long-term evolutionary dynamics of biological invasions are not well understood. Hybridization, either among waves of invasion or between native and introduced populations, could alter the ecological and evolutionary impacts of invasions yet has rarely been studied in marine invasive species. The European green crab (Carcinus maenas) invaded eastern North America twice from northern and southern locations in its native range...
April 19, 2017: Heredity
https://www.readbyqxmd.com/read/28418634/protein-trapping-in-plasmonic-nanoslit-and-nanoledge-cavities-the-behavior-and-sensing
#13
Zheng Zeng, Xiaojun Shi, Taylor Mabe, Shaun Christie, Grant Gilmore, Adam W Smith, Jianjun Wei
A novel plasmonic nanoledge device was presented to explore the geometry-induced trapping of nanoscale biomolecules and examine a generation of surface plasmon resonance (SPR) for plasmonic sensing. To design an optimal plasmonic device, a semi-analytical model was implemented for a quantitative analysis of SPR under plane-wave illumination and a finite-difference time-domain (FDTD) simulation was used to study the optical transmission and refractive index (RI) sensitivity. In addition, total internal reflection fluorescence (TIRF) imaging was used to visualize the migration of fluorescently labeled bovine serum albumin (BSA) into the nanoslits; and fluorescence correlation spectroscopy (FCS) was further used to investigate the diffusion of BSA in the nanoslits...
April 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28415370/bubblelike-structures-generated-by-activation-of-internal-shape-modes-in-two-dimensional-sine-gordon-line-solitons
#14
Mónica A García-Ñustes, Juan F Marín, Jorge A González
Nonlinear waves that collide with localized defects exhibit complex behavior. Apart from reflection, transmission, and annihilation of an incident wave, a local inhomogeneity can activate internal modes of solitons, producing many impressive phenomena. In this work we investigate a two-dimensional sine-Gordon model perturbed by a family of localized forces. We observed the formation of bubblelike and droplike structures due to local internal shape mode instabilities. We describe the formation of such structures on the basis of a one-dimensional theory of activation of internal modes of sine-Gordon solitons...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415268/delayed-collapses-of-bose-einstein-condensates-in-relation-to-anti-de-sitter-gravity
#15
Anxo F Biasi, Javier Mas, Angel Paredes
We numerically investigate spherically symmetric collapses in the Gross-Pitaevskii equation with attractive nonlinearity in a harmonic potential. Even below threshold for direct collapse, the wave function bounces off from the origin and may eventually become singular after a number of oscillations in the trapping potential. This is reminiscent of the evolution of Einstein gravity sourced by a scalar field in anti de Sitter space where collapse corresponds to black-hole formation. We carefully examine the long time evolution of the wave function for continuous families of initial states in order to sharpen out this qualitative coincidence which may bring new insights in both directions...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415103/p673improvement-of-arterial-stiffness-and-myocardial-deformation-in-patients-with-poorly-controlled-diabetes-mellitus-type-2-after-optimization-of-antidiabetic-medication
#16
I Ikonomidis, G Pavlidis, V Lambadiari, F Kousathana, H Triantafyllidi, M Varoudi, D Vlastos, S Vlachos, G Dimitriadis, J Lekakis
Background: Arterial stiffness is associated with increased risk for cardiovascular disease. The purpose of this study is to investigate the arterial stiffness and myocardial deformation in patients with poorly controlled diabetes mellitus type 2 before and after glycemic control by optimal medication. Methods: In 50 patients with uncontrolled type 2 diabetes(age:52±10years)and 25 controls of similar age and sex and no atherosclerotic risk factors we measured at baseline and 6 months after glycemic control a) carotid-femoral pulse wave velocity(PWVc m/sec-Complior SP ALAM),central systolic blood pressure(cSBP -mmHg),augmentation index(AI%), of the aortic pulse wave(ArteriographTensioMed) b)S',E'(m/sec)andE'/A'of mitral annulus by Tissue Doppler c)LV longitudinal strain(GLS-%),systolic(LongSr-l/sec)and diastolic(LongSrE-l/sec)strain rate, twisting(Tw-deg),peak twisting(Tw)and untwisting(unTw-deg/sec)velocity using speckle tracking echocardiography...
December 1, 2016: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28413741/serial-magnetic-resonance-imaging-in-creutzfeldt-jakob-disease-a-case-report-and-literature-review
#17
Ahmed H Qavi, Tasnim F Imran, Zachariah Hasan, Fariha Ilyas, Usman Ghani, Salman Assad, Shabih Hasan
Creutzfeldt-Jakob disease (CJD) is a rare, degenerative, invariably fatal brain disorder. CJD usually appears in later life and runs a rapid course. Typically, the onset of symptoms occurs about age 60 and about 90% of individuals die within one year. We report a case of 67-year-old male presented with progressive aphasia, confusion, dysphagia and inability to carry out activities of daily life (ADLs) over a period of three to four weeks. The patient had past medical history of chronic atrial fibrillation and hypertension...
March 14, 2017: Curēus
https://www.readbyqxmd.com/read/28413682/multi-focal-hifu-reduces-cavitation-in-mild-hyperthermia
#18
Vandiver Chaplin, Charles F Caskey
BACKGROUND: Mild-hyperthermia therapy (40-45 °C) with high-intensity focused ultrasound (HIFU) is a technique being considered in a number of different treatments such as thermally activated drug delivery, immune-stimulation, and as a chemotherapy adjuvant. Mechanical damage and loss of cell viability associated with HIFU-induced acoustic cavitation may pose a risk during these treatments or may hinder their success. Here we present a method that achieves mild heating and reduces cavitation by using a multi-focused HIFU beam...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28412277/the-association-of-endothelial-function-and-tone-by-digital-arterial-tonometry-with-mri-left-ventricular-mass-in-african-americans-the-jackson-heart-study
#19
Avnish Tripathi, Emelia J Benjamin, Solomon K Musani, Naomi M Hamburg, Connie W Tsao, Arti Saraswat, Ramachandran S Vasan, Gary F Mitchell, Ervin R Fox
Peripheral vascular endothelial dysfunction assessed by digital peripheral arterial tonometry (PAT) has been associated with risk for adverse cardiovascular events. We examined the relations of peripheral microvascular dysfunction and left ventricular mass in a community-based cohort of African Americans. We examined participants of the Jackson Heart Study who had PAT and cardiac magnetic resonance imaging evaluations between 2007 and 2013. Consistent with pertinent literature, left ventricular mass index (LVMI) was adjusted for body size by indexing to height(2...
March 27, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/28412009/shockwave-lithotripsy-with-music-less-painful-and-more-satisfactory-treatment
#20
D G Ordaz Jurado, A Budia Alba, P Bahilo Mateu, M Trassierra Villa, D López-Acón, F Boronat Tormo
INTRODUCTION: The objective of this study was to determine whether listening to music during a session of extracorporeal shockwave lithotripsy (ESWL) improves patients' pain. MATERIAL AND METHOD: A simple, blind randomisation was undertaken of patients with kidney and ureter stones attending an ESWL session of 7,000 waves for the first time, between September and December 2014. One group was given music and the other was not. The age, gender, location of stones (kidney/ureter) were recorded and 2questionnaires: pre ESWL (questionnaire A) and postESWL (questionnaire B)...
April 12, 2017: Actas Urologicas Españolas
keyword
keyword
41404
1
2
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"