keyword
MENU ▼
Read by QxMD icon Read
search

T wave axis

keyword
https://www.readbyqxmd.com/read/29758759/calculation-of-gyrotropy-coefficients-in-media-with-low-pitch-helical-structures
#1
H Dhaouadi, F Trabelsi, O Riahi, T Othman
Chiral smectic liquid crystals are known for their huge optical activity due to the precession of the anisotropic dielectric tensor around the helicoidal axis. For an oblique direction of the propagating wave, the helix acts as a grating which splits an incident beam in different directions as long as the pitch is not too small with respect to the light wavelength. When the pitch of the helix is smaller than the wavelength, the effect of the helix is a renormalization of the gyrotropic coefficients (g_{⊥} and g_{∥}) of the resulting uniaxial medium...
April 2018: Physical Review. E
https://www.readbyqxmd.com/read/29723683/beyond-the-length-and-look-of-repolarization-defining-the-non-qtc-electrocardiographic-profiles-of-patients-with-congenital-long-qt-syndrome
#2
Conor M Lane, J Martijn Bos, Ram K Rohatgi, Michael J Ackerman
BACKGROUND: Little is known about the spectrum and prevalence of ECG features beyond the length and morphology of repolarization in patients with congenital long QT syndrome (LQTS). OBJECTIVE: To characterize the full ECG phenotype of LQTS patients and evaluate differences by age and LQTS genotype. METHODS: Retrospective review of 943 patients with LQTS (57% female, median age 25 years; IQR 9 - 34 years) was performed. Comprehensive analysis of their initial evaluation ECG was performed using definitions outlined in Heart Rhythm Society guidelines...
April 30, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29678445/spatial-patterns-of-gene-expression-are-unveiled-in-the-chick-primitive-streak-by-ordering-single-cell-transcriptomes
#3
Katie L Vermillion, Rhonda Bacher, Alex P Tannenbaum, Scott Swanson, Peng Jiang, Li-Fang Chu, Ron Stewart, James A Thomson, David T Vereide
During vertebrate development, progenitor cells give rise to tissues and organs through a complex choreography that commences at gastrulation. A hallmark event of gastrulation is the formation of the primitive streak, a linear assembly of cells along the anterior-posterior (AP) axis of the developing organism. To examine the primitive streak at a single-cell resolution, we measured the transcriptomes of individual chick cells from the streak or the surrounding tissue (the rest of the area pellucida) in Hamburger-Hamilton stage 4 embryos...
April 17, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29677280/assessment-of-the-effectiveness-of-combat-eyewear-protection-against-blast-overpressure
#4
A Sundaramurthy, M Skotak, E Alay, G Unnikrishnan, H Mao, X Duan, S T Williams, T H Harding, N Chandra, J Reifman
It is unclear whether combat eyewear used by U. S. Service members is protective against blast overpressures (BOPs) caused by explosive devices. Here, we investigated the mechanisms by which BOP bypasses eyewear and increases eye surface pressure. We performed experiments and developed three-dimensional (3D) finite element (FE) models of a head form (HF) equipped with an advanced combat helmet (ACH) and with no eyewear, spectacles, or goggles in a shock tube at three BOPs and five head orientations relative to the blast wave...
July 1, 2018: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29593570/distinct-ecg-phenotypes-identified-in-hypertrophic-cardiomyopathy-using-machine-learning-associate-with-arrhythmic-risk-markers
#5
Aurore Lyon, Rina Ariga, Ana Mincholé, Masliza Mahmod, Elizabeth Ormondroyd, Pablo Laguna, Nando de Freitas, Stefan Neubauer, Hugh Watkins, Blanca Rodriguez
Aims: Ventricular arrhythmia triggers sudden cardiac death (SCD) in hypertrophic cardiomyopathy (HCM), yet electrophysiological biomarkers are not used for risk stratification. Our aim was to identify distinct HCM phenotypes based on ECG computational analysis, and characterize differences in clinical risk factors and anatomical differences using cardiac magnetic resonance (CMR) imaging. Methods: High-fidelity 12-lead Holter ECGs from 85 HCM patients and 38 healthy volunteers were analyzed using mathematical modeling and computational clustering to identify phenotypic subgroups...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29556784/study-on-ecg-in-the-adolescent
#6
Hung-Chi Lue, Mei-Hwan Wu, Jou-Kou Wang, Min-Tai Lin, Chun-Wei Lu, Shuenn-Nan Chiu, Chun-An Chen, En-Ting Wu, Ching-Chia Wang, Chun-Min Fu, Wei-Chien Tseng, Wei-Hsuan Chang, Meng-Chang Lee
Normal ECG values in newborns, infants, and children have been collected and published. ECG in the adolescent, however, remains, to be collected and studied. The present study was designed and carried out to establish the normal ECG standards in male and female adolescents. A total of 898 school children and adolescents screened and examined as healthy were divided by age and sex into 6-9, 9-13, and 13-18 years age-groups. A 12 lead conventional ECG was recorded in 10 mm/mV and 25 mm/s, utilizing an automated Fukuda Denshi FCP-4301, MS-DOS/IBM-AT ECG machine...
March 19, 2018: Pediatric Cardiology
https://www.readbyqxmd.com/read/29535027/new-waves-rhythmic-electrical-field-stimulation-systematically-alters-spontaneous-slow-dynamics-across-mouse-neocortex
#7
Anastasia Greenberg, Javad Karimi Abadchi, Clayton T Dickson, Majid H Mohajerani
The signature rhythm of slow-wave forebrain activity is the large amplitude, slow oscillation (SO: ∼1 Hz) made up of alternating synchronous periods of activity and silence at the single cell and network levels. On each wave, the SO originates at a unique location and propagates across the neocortex. Attempts to manipulate SO activity using electrical fields have been shown to entrain cortical networks and enhance memory performance. However, neural activity during this manipulation has remained elusive due to methodological issues in typical electrical recordings...
July 1, 2018: NeuroImage
https://www.readbyqxmd.com/read/29530523/electrocardiographic-changes-and-conduction-disturbances-after-transfemoral-aortic-valve-implantation-with-edwards-sapien-3-prosthesis
#8
Unzue Leire, García Eulogio, Rodríguez Rodrigo Francisco José, Parra Jiménez Francisco Javier, Medina Peralta Juan, Díaz-Antón Belen, Rodríguez Del Río Miguel, Fontenla Adolfo, Teijeiro Rodrigo, Rubio-Alonso Belén
OBJECTIVES: The aim of this study is to describe electrocardiographic changes and conduction abnormalities in patients undergoing transcatheter aortic valve implantation (TAVI). METHODS: 76 patients who underwent TAVI using Edwards Sapien 3 prosthesis were included, comparing electrocardiographic registries at admission, post-procedure and before discharge. RESULTS: Patients after TAVI presented a longer PR interval, a wider QRS, and a longer corrected QT, with a left deviation of QRS axis and T waves; reversible changes that tended to correct in the following days after TAVI...
May 2018: Journal of Electrocardiology
https://www.readbyqxmd.com/read/29525195/advanced-age-attenuates-left-ventricular-filling-efficiency-quantified-using-vortex-formation-time-a-study-of-octogenarians-with-normal-left-ventricular-systolic-function-undergoing-coronary-artery-surgery
#9
Paul S Pagel, Lonnie Dye, Brent T Boettcher, Julie K Freed
OBJECTIVE: Blood flow across the mitral valve during early left ventricular (LV) filling produces a 3-dimensional rotational fluid body, known as a vortex ring, that enhances LV filling efficiency. Diastolic dysfunction is common in elderly patients, but the influence of advanced age on vortex formation is unknown. The authors tested the hypothesis that advanced age is associated with a reduction in LV filling efficiency quantified using vortex formation time (VFT) in octogenarians undergoing coronary artery bypass graft (CABG) surgery...
March 7, 2018: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29506156/the-il-4-stat6-ppar%C3%AE-signaling-axis-is-driving-the-expansion-of-the-rxr-heterodimer-cistrome-providing-complex-ligand-responsiveness-in-macrophages
#10
Bence Daniel, Gergely Nagy, Attila Horvath, Zsolt Czimmerer, Ixchelt Cuaranta-Monroy, Szilard Poliska, Tristan T Hays, Sascha Sauer, Jean Francois-Deleuze, Laszlo Nagy
Retinoid X receptor (RXR) is an obligate heterodimeric partner of several nuclear receptors (NRs), and as such a central component of NR signaling regulating the immune and metabolic phenotype of macrophages. Importantly, the binding motifs of RXR heterodimers are enriched in the tissue-selective open chromatin regions of resident macrophages, suggesting roles in subtype specification. Recent genome-wide studies revealed that RXR binds to thousands of sites in the genome, but the mechanistic details how the cistrome is established and serves ligand-induced transcriptional activity remained elusive...
February 28, 2018: Nucleic Acids Research
https://www.readbyqxmd.com/read/29504323/electrocardiographic-manifestations-in-paediatric-wilson-disease
#11
Syeda Sara Batool Hamdani, Huma Arshad Cheema, Anjum Saeed, Hassan Suleman Malik, Tayaba Sehar
BACKGROUND: Wilson disease (WD) is one of the most common metabolic liver diseases in older children. It has a strong genetic background with autosomal recessive inheritance. WD is a multisystem disorder with predominant hepatic and neurological manifestations and variable age of presentation. The data on cardiac manifestations in children is very limited and only few adult studies are available in the literature. This study was planned to determine the frequency and spectrum of Electrocardiographic (ECG) changes in pediatric WD...
January 2018: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/29459494/a-dual-mode-hemispherical-sparse-array-for-3d-passive-acoustic-mapping-and-skull-localization-within-a-clinical-mri-guided-focused-ultrasound-device
#12
Calum Crake, Spencer T Brinker, Christian M Coviello, Margaret S Livingstone, Nathan J McDannold
Previous work has demonstrated that passive acoustic imaging may be used alongside MRI for monitoring of focused ultrasound therapy. However, past implementations have generally made use of either linear arrays originally designed for diagnostic imaging or custom narrowband arrays specific to in-house therapeutic transducer designs, neither of which is fully compatible with clinical MR-guided focused ultrasound (MRgFUS) devices. Here we have designed an array which is suitable for use within an FDA-approved MR-guided transcranial focused ultrasound device, within the bore of a 3 Tesla clinical MRI scanner...
March 15, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29430560/epilepsy-is-associated-with-ventricular-alterations-following-convulsive-status-epilepticus-in-children
#13
Wail Ali, Beth A Bubolz, Linh Nguyen, Danny Castro, Jorge Coss-Bu, Michael M Quach, Curtis E Kennedy, Anne E Anderson, Yi-Chen Lai
Objective: Convulsive status epilepticus can exert profound cardiovascular effects in adults including ventricular depolarization-repolarization abnormalities. Whether status epilepticus adversely affects ventricular electrical properties in children is less understood. Therefore, we sought to characterize ventricular alterations and the associated clinical factors in children following convulsive status epilepticus. Methods: We conducted a 2-year retrospective, case-control study...
December 2017: Epilepsia Open
https://www.readbyqxmd.com/read/29400796/digital-holographic-detection-in-the-off-axis-pupil-plane-recording-geometry-for-deep-turbulence-wavefront-sensing
#14
Matthias T Banet, Mark F Spencer, Robert A Raynor
This paper uses wave-optics and signal-to-noise models to explore the estimation accuracy of digital-holographic detection in the off-axis pupil plane recording geometry for deep-turbulence wavefront sensing. In turn, the analysis examines three important parameters: the number of pixels across the width of the focal-plane array, the window radius in the Fourier plane, and the signal-to-noise ratio. By varying these parameters, the wave-optics and signal-to-noise models quantify performance via a metric referred to as the field-estimated Strehl ratio, and the analysis leads to a method for optimal windowing of the turbulence-limited point spread function...
January 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/29386554/field-controllable-spin-hall-effect-of-light-in-optical-crystals-a-conoscopic-mueller-matrix-analysis
#15
C T Samlan, Nirmal K Viswanathan
Electric-field applied perpendicular to the direction of propagation of paraxial beam through an optical crystal dynamically modifies the spin-orbit interaction (SOI), leading to the demonstration of controllable spin-Hall effect of light (SHEL). The electro- and piezo-optic effects of the crystal modifies the radially symmetric spatial variation in the fast-axis orientation of the crystal, resulting in a complex pattern with different topologies due to the symmetry-breaking effect of the applied field. This introduces spatially-varying Pancharatnam-Berry type geometric phase on to the paraxial beam of light, leading to the observation of SHEL in addition to the spin-to-vortex conversion...
January 31, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348018/myocardial-inflammation-predicts-remodeling-and-neuroinflammation-after-myocardial-infarction
#16
James T Thackeray, Henri C Hupe, Yong Wang, Jens P Bankstahl, Georg Berding, Tobias L Ross, Johann Bauersachs, Kai C Wollert, Frank M Bengel
BACKGROUND: The local inflammatory tissue response after acute myocardial infarction (MI) determines subsequent healing. Systemic interaction may induce neuroinflammation as a precursor to neurodegeneration. OBJECTIVES: This study sought to assess the influence of MI on cardiac and brain inflammation using noninvasive positron emission tomography (PET) of the heart-brain axis. METHODS: After coronary artery ligation or sham surgery, mice (n = 49) underwent serial whole-body PET imaging of the mitochondrial translocator protein (TSPO) as a marker of activated macrophages and microglia...
January 23, 2018: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29261643/a-mildly-relativistic-wide-angle-outflow-in-the-neutron-star-merger-event-gw170817
#17
K P Mooley, E Nakar, K Hotokezaka, G Hallinan, A Corsi, D A Frail, A Horesh, T Murphy, E Lenc, D L Kaplan, K De, D Dobie, P Chandra, A Deller, O Gottlieb, M M Kasliwal, S R Kulkarni, S T Myers, S Nissanke, T Piran, C Lynch, V Bhalerao, S Bourke, K W Bannister, L P Singer
GW170817 was the first gravitational-wave detection of a binary neutron-star merger. It was accompanied by radiation across the electromagnetic spectrum and localized to the galaxy NGC 4993 at a distance of 40 megaparsecs. It has been proposed that the observed γ-ray, X-ray and radio emission is due to an ultra-relativistic jet being launched during the merger (and successfully breaking out of the surrounding material), directed away from our line of sight (off-axis). The presence of such a jet is predicted from models that posit neutron-star mergers as the drivers of short hard-γ-ray bursts...
February 8, 2018: Nature
https://www.readbyqxmd.com/read/29239433/photophysical-properties-of-acetylene-linked-syn-bimane-oligomers-a-molecular-photonic-wire
#18
T S Chwee, Z C Wong, M B Sullivan, W Y Fan
Computational studies using correlated wave function methods and density functional theory were carried out on a series of acetylene-linked bimane oligomers with particular emphasis on their excitonic properties and implications for intra-chain excitation energy transfer (EET). The low energy barriers found for the rotation of bimane subunits about the longitudinal axis are such that the π-conjugation is easily disrupted. Nevertheless, a distinctive feature of the oligomer lies in the parallel alignment of the S1 transition dipole along the longitudinal axis, which sustains electronic coupling between adjacent bimane subunits over a range of torsional angles and is crucial for driving intra-chain EET...
January 3, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29217568/attosecond-resolved-photoionization-of-chiral-molecules
#19
S Beaulieu, A Comby, A Clergerie, J Caillat, D Descamps, N Dudovich, B Fabre, R Géneaux, F Légaré, S Petit, B Pons, G Porat, T Ruchon, R Taïeb, V Blanchet, Y Mairesse
Chiral light-matter interactions have been investigated for two centuries, leading to the discovery of many chiroptical processes used for discrimination of enantiomers. Whereas most chiroptical effects result from a response of bound electrons, photoionization can produce much stronger chiral signals that manifest as asymmetries in the angular distribution of the photoelectrons along the light-propagation axis. We implemented self-referenced attosecond photoelectron interferometry to measure the temporal profile of the forward and backward electron wave packets emitted upon photoionization of camphor by circularly polarized laser pulses...
December 8, 2017: Science
https://www.readbyqxmd.com/read/29191568/value-of-the-electrocardiographic-p-wave-t-wave-qrs-axis-as-a-predictor-of-mortality-in-14-years-in-a-population-with-a-high-prevalence-of-chagas-disease-from-the-bambu%C3%A3-cohort-study-of-aging
#20
Diego N Moraes, Bruno R Nascimento, Andrea Z Beaton, Elsayed Z Soliman, Maria Fernanda Lima-Costa, Rodrigo C P Dos Reis, Antonio Luiz P Ribeiro
We sought to investigate the prognostic value of the electrocardiogram (ECG) electrical axes (P wave, T wave and QRS) as predictors of mortality in the 14-year follow-up of the prospective cohort of all residents ≥60 years living in the southeastern Brazilian city of Bambuí, a population with high prevalence of Chagas disease (ChD). Baseline ECG axes were automatically measured with normal values defined as follows: P-wave axis 0° to 75°, QRS axis -30° to 90°, and T axis 15° to 75°. Participants underwent annual follow-up visits and death was verified using death certificates...
February 1, 2018: American Journal of Cardiology
keyword
keyword
16118
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"