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T wave alternant

Amelia A Miramonti, Nathaniel D M Jenkins, Preeti D Oza, Joseph P Weir, Joel T Cramer
INTRODUCTION: This study examined relationships among mechanomyographic (MMG), electromyographic (EMG), and peak twitch torque (PTT) responses as well as test-retest reliability when recorded during recruitment curves in the soleus muscle. METHODS: PTT, EMG (M-wave, H-reflex), and MMG responses were recorded during recruitment curves in 16 subjects (age=24±2y) on 2 separate days. The sum of the M-wave and H-reflex (M+H) was calculated. Correlations among variables and test-retest reliability were determined...
October 8, 2016: Muscle & Nerve
Pasquale Crea, Giuseppe Picciolo, Teresa Crea, Francesco Luzza
An 80-year-old male, who previously received a dual chamber pacemaker, was referred to our ambulatory for dizziness and fatigue. The ECG obtained showed sinus rhythm, highly variable atrioventricular (AV) interval and alternation between spontaneous and paced ventricular complexes. A spike on the ascending part of the T wave was observed, suggesting ventricular undersensing. However, telemetry-supported pacemaker control showed inconstant atrial undersensing.
September 24, 2016: Journal of Electrocardiology
Casey A Marjerrison, Corey M Thompson, Gabrielle Sala, Dalini D Maharaj, Edwin Kermarrec, Yipeng Cai, Alannah M Hallas, Murray N Wilson, Timothy J S Munsie, Garrett E Granroth, Roxana Flacau, John E Greedan, Bruce D Gaulin, Graeme M Luke
Double perovskites (DP) of the general formula Ba2MReO6, where M = Mg, Zn, and Y2/3, all based on Re(6+) (5d(1), t2g(1)), were synthesized and studied using magnetization, heat capacity, muon spin relaxation, and neutron-scattering techniques. All are cubic, Fm3̅m, at ambient temperature to within the resolution of the X-ray and neutron diffraction data, although the muon data suggest the possibility of a local distortion for M = Mg. The M = Mg DP is a ferromagnet, Tc = 18 K, with a saturation moment ∼0...
October 4, 2016: Inorganic Chemistry
Chase T Ellis, Joseph G Tischler, Orest J Glembocki, Francisco J Bezares, Alexander J Giles, Richard Kasica, Loretta Shirey, Jeffrey C Owrutsky, Dmitry N Chigrin, Joshua D Caldwell
Polar dielectrics have garnered much attention as an alternative to plasmonic metals in the mid- to long-wave infrared spectral regime due to their low optical losses. As such, nanoscale resonators composed of these materials demonstrate figures of merit beyond those achievable in plasmonic equivalents. However, until now, only low-order, phonon-mediated, localized polariton resonances, known as surface phonon polaritons (SPhPs), have been observed in polar dielectric optical resonators. In the present work, we investigate the excitation of 16 distinct high-order, multipolar, localized surface phonon polariton resonances that are optically excited in rectangular pillars etched into a semi-insulating silicon carbide substrate...
2016: Scientific Reports
Deniz Akdis, Corinna Brunckhorst, Firat Duru, Ardan M Saguner
This overview gives an update on the molecular mechanisms, clinical manifestations, diagnosis and therapy of arrhythmogenic cardiomyopathy (ACM). ACM is mostly hereditary and associated with mutations in genes encoding proteins of the intercalated disc. Three subtypes have been proposed: the classical right-dominant subtype generally referred to as ARVC/D, biventricular forms with early biventricular involvement and left-dominant subtypes with predominant LV involvement. Typical symptoms include palpitations, arrhythmic (pre)syncope and sudden cardiac arrest due to ventricular arrhythmias, which typically occur in athletes...
August 2016: Arrhythmia & Electrophysiology Review
Yi-Fu Cai, Salvatore Capozziello, Mariafelicia De Laurentis, Emmanuel N Saridakis
Over recent decades, the role of torsion in gravity has been extensively investigated along the main direction of bringing gravity closer to its gauge formulation and incorporating spin in a geometric description. Here we review various torsional constructions, from teleparallel, to Einstein-Cartan, and metric-affine gauge theories, resulting in extending torsional gravity in the paradigm of f (T) gravity, where f (T) is an arbitrary function of the torsion scalar. Based on this theory, we further review the corresponding cosmological and astrophysical applications...
October 2016: Reports on Progress in Physics
Isabelle C Beulaygue, Michael T French
BACKGROUND: Although marijuana use is commonly associated with increased appetite and the likelihood of weight gain, research findings in this area are mixed. Most studies, however, report cross-sectional associations and rarely control for such important predictors as physical activity, socioeconomic status, and alcohol and other drug use. METHODS: Using data from Waves III (N = 13,038) and IV (N = 13,972) of the National Longitudinal Survey of Adolescent Health, we estimate fixed-effects models to more rigorously study the relationships between marijuana use and body mass index over time...
September 2016: Journal of Mental Health Policy and Economics
Mikhail Y Ivanov, Vladimir A Nadolinny, Elena G Bagryanskaya, Yuriy A Grishin, Matvey V Fedin, Sergey L Veber
High purity bismuth germanate (Bi4(GeO4)3, BGO) is proposed and implemented as an alternative material for dielectric EPR resonators. A significant improvement of the absolute sensitivity can be readily achieved by substituting the alumina insert (ring) by BGO-made one in commercially available X-band EPR probeheads. Four BGO dielectric inserts of 2, 3, 4 and 5mm inner diameter (ID) were made for comparison with standard 5mm inner diameter alumina insert. All inserts were introduced into commercial Bruker EPR resonator ER 4118X-MD-5W1, and their performance was investigated...
October 2016: Journal of Magnetic Resonance
Erick A Perez Alday, Haibo Ni, Chen Zhang, Michael A Colman, Zizhao Gan, Henggui Zhang
Myocardial ventricular ischemia arises from a lack of blood supply to the heart, which may cause abnormal repolarization and excitation wave conduction patterns in the tissue, leading to cardiac arrhythmias and even sudden death. Current diagnosis of cardiac ischemia by the 12-lead electrocardiogram (ECG) has limitations as they are insensitive in many cases and may show unnoticeable differences to normal patterns. As the magnetic field provides extra information on cardiac excitation and is more sensitive to tangential currents to the surface of the chest, whereas the electric field is more sensitive to flux currents, it has been hypothesized that the magnetocardiogram (MCG) may provide a complementary method to the ECG in ischemic diagnosis...
2016: PloS One
A Lindroos, A Jula, P Puukka, I Kantola, V Salomaa, E Juhanoja, S Sivén, P Jousilahti, J Johansson, T Niiranen
OBJECTIVE: Our objective was to test the agreement between nighttime home and nighttime ambulatory blood pressure (BP) and to compare their associations with left ventricular hypertrophy, arterial stiffness and carotid atherosclerosis. DESIGN AND METHOD: A population sample of 248 participants underwent measurements for 24-hour ambulatory BP and nighttime home BP (3 measurements at 2, 3 and 4 hours during 2 nights). We measured ambulatory BP with a Microlife WatchBP O3 device and home BP with a timer-equipped Microlife WatchBP Home N device...
September 2016: Journal of Hypertension
Robert Dymarek, Jakub Taradaj, Joanna Rosińczuk
Objective. To evaluate the effectiveness of radial shock waves (rESW) for wrist and fingers flexors spasticity in stroke patients. Methods. Twenty patients with upper limb muscle spasticity were enrolled in the study and treated with a single session of rESW. The spasticity level of the radio carpal (RC) and finger (FF) joints was assessed using Modified Ashworth Scale (MAS). The resting bioelectrical activity of the flexor carpi radialis (FCR) and flexor carpi ulnaris (FCU) was examined using surface electromyography (sEMG)...
2016: Evidence-based Complementary and Alternative Medicine: ECAM
Hiroshi Kawazoe, Yukiko Nakano, Hidenori Ochi, Masahiko Takagi, Yusuke Hayashi, Yuko Uchimura, Takehito Tokuyama, Yoshikazu Watanabe, Hiroya Matsumura, Shunsuke Tomomori, Akinori Sairaku, Kazuyoshi Suenari, Akinori Awazu, Yosuke Miwa, Kyoko Soejima, Kazuaki Chayama, Yasuki Kihara
BACKGROUND: Risk stratification for ventricular fibrillation (VF) in patients with Brugada syndrome (BrS) remains controversial. OBJECTIVE: The purpose of this study was to construct a novel prediction model for VF risk in BrS patients using noninvasive parameters. METHODS: A total of 143 Japanese BrS patients with VF (n = 35) and without VF (n = 108) were retrospectively enrolled. We built a logistic regression model predicting VF occurrence and evaluated it by cross-validation...
October 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
J P Rodriguez
We obtain the exact low-energy spectrum of two mobile holes in a t-J model for an isolated layer in an iron-pnictide superconductor. The minimum d xz and d yz orbitals per iron atom are included, with no hybridization between the two. After tuning the Hund coupling to a putative quantum critical point (QCP) that separates a commensurate spin-density wave from a hidden-order antiferromagnet at half filling, we find an s-wave hole-pair groundstate and a d-wave hole-pair excited state. Near the QCP, both alternate in sign between hole Fermi surface pockets at the Brillouin zone center and emergent electron Fermi surface pockets at momenta that correspond to commensurate spin-density waves (cSDW)...
September 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Adam J Fleisher, David A Long, Zachary D Reed, Joseph T Hodges, David F Plusquellic
Dual-comb spectroscopy allows for the rapid, multiplexed acquisition of high-resolution spectra without the need for moving parts or low-resolution dispersive optics. This method of broadband spectroscopy is most often accomplished via tight phase locking of two mode-locked lasers or via sophisticated signal processing algorithms, and therefore, long integration times of phase coherent signals are difficult to achieve. Here we demonstrate an alternative approach to dual-comb spectroscopy using two phase modulator combs originating from a single continuous-wave laser capable of > 2 hours of coherent real-time averaging...
May 16, 2016: Optics Express
J Matthew Hoch, Daniel T Schneck, Christopher J Neufeld
Most barnacles are sessile, simultaneous hermaphrodites that reproduce by copulation. This is achieved through the extension of a muscular penis, famous for being the proportionally largest in the animal kingdom. The penis is a long cylindrical or conical organ, composed of a series of folded rings, allowing it to stretch to great lengths. The penises are covered with chemosensory setae allowing them to seek out receptive neighbors. For many species, the condition of the penis changes seasonally. In the most extreme circumstances, it degenerates and is shed during the first post-mating molt and is re-grown for the next mating season...
October 2016: Integrative and Comparative Biology
A Endo, S J C Yates, J Bueno, D J Thoen, V Murugesan, A M Baryshev, T M Klapwijk, P P van der Werf, J J A Baselmans
We show the first experimental results which prove that superconducting NbTiN coplanar-waveguide resonators can achieve a loaded Q factor in excess of 800 in the 350 GHz band. These resonators can be used as narrow band pass filters for on-chip filter bank spectrometers for astronomy. Moreover, the low-loss coplanar waveguide technology provides an interesting alternative to microstrip lines for constructing large scale submillimeter wave electronics in general.
2016: Journal of Low Temperature Physics
H Pendell Meyers, Elias Jaffa, Stephen W Smith, Weiying Drake, Alexander T Limkakeng
BACKGROUND: T-wave morphology in the setting of left bundle branch block (LBBB) has been proposed as an indicator of myocardial ischemia. OBJECTIVES: We sought to identify T-wave morphology findings in patients with LBBB that predict non-ST-segment elevation myocardial infarction (NSTEMI). We hypothesized that two or more contiguous leads with concordant T waves would be predictive of NSTEMI. METHODS: This was a retrospective cohort study performed by chart review in a tertiary care center emergency department...
September 2016: Journal of Emergency Medicine
N Kallweit, P Baumhoff, A Krueger, N Tinne, A Kral, T Ripken, H Maier
Optical stimulation of the cochlea with laser light has been suggested as an alternative to conventional treatment of sensorineural hearing loss with cochlear implants. The underlying mechanisms are controversially discussed: The stimulation can either be based on a direct excitation of neurons, or it is a result of an optoacoustic pressure wave acting on the basilar membrane. Animal studies comparing the intra-cochlear optical stimulation of hearing and deafened guinea pigs have indicated that the stimulation requires intact hair cells...
2016: Scientific Reports
B A Stuck, J T Maurer
Over the past few years, the diagnostic tools and therapeutic approaches for obstructive sleep apnea (OSA) have evolved further. Based on a review of the current literature and the personal experiences of the authors, the most relevant developments are summarized in this article and discussed with regard to their impact on the clinical management of the disease. In the third edition of the International Classification of Sleep Disorders, the classification of sleep-disordered breathing was modified. Notably, additional clinical criteria for the diagnosis of OSA were established and out-of-center sleep testing was introduced as an alternative to polysomnography...
June 14, 2016: HNO
Vienna E Brunt, Matthew J Howard, Michael A Francisco, Brett R Ely, Christopher T Minson
KEY POINTS: A recent 30 year prospective study showed that lifelong sauna use reduces cardiovascular-related and all-cause mortality; however, the specific cardiovascular adaptations that cause this chronic protection are currently unknown. We investigated the effects of 8 weeks of repeated hot water immersion ('heat therapy') on various biomarkers of cardiovascular health in young, sedentary humans. We showed that, relative to a sham group which participated in thermoneutral water immersion, heat therapy increased flow-mediated dilatation, reduced arterial stiffness, reduced mean arterial and diastolic blood pressure, and reduced carotid intima media thickness, with changes all on par or greater than what is typically observed in sedentary subjects with exercise training...
September 15, 2016: Journal of Physiology
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