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https://www.readbyqxmd.com/read/28822667/doppler-parameters-derived-from-transthoracic-echocardiography-accurately-detect-bioprosthetic-mitral-valve-dysfunction
#1
Ryan J Spencer, Ken G Gin, Michael Y C Tsang, Teresa S M Tsang, Parvathy Nair, Pui K Lee, John Jue
BACKGROUND: Detecting bioprosthetic mitral valve dysfunction on transthoracic echocardiography can be challenging because of acoustic shadowing of regurgitant jets and a wide normal range of transvalvular gradients. Several studies in mechanical mitral valves have demonstrated the utility of the transthoracically derived parameters E (peak early mitral inflow velocity), pressure half-time, and the ratio of mitral inflow velocity-time integral (VTIMV) to left ventricular outflow tract velocity-time integral (VTILVOT) in detecting significant prosthetic dysfunction...
August 16, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28822620/medications-and-adverse-voice-effects
#2
Kátia Nemr, Ariana Di Carlos Silva, Danilo de Albuquerque Rodrigues, Marcia Simões Zenari
OBJECTIVES: To identify the medications used by patients with dysphonia, describe the voice symptoms reported on initial speech-language pathology (SLP) examination, evaluate the possible direct and indirect effects of medications on voice production, and determine the association between direct and indirect adverse voice effects and self-reported voice symptoms, hydration and smoking habits, comorbidities, vocal assessment, and type and degree of dysphonia. STUDY DESIGN: This is a retrospective cross-sectional study...
August 16, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28822412/-feasibility-of-single-staged-han-uvulopalatopharyngoplasty-with-septoplasty-in-adults-with-obstructive-sleep-apnea-hypopnea-syndrome
#3
S G Xiu, D D Yu, Y M Wang, S D Gao
Objective: To explore the feasibility and therapeutic effect of single-staged Han-uvulopalatopharyngoplasty with septoplasty in adults with obstructive sleep apnea-hypopnea syndrome. Methods: Ninety six cases with OSAHS were diagnosed by polysomnography, and they all had retropalatal obstruction and deviation of nasal septum. Patients were divided into study group(48 cases) and control group(48 cases) randomly. Cases in study group were simultaneously treated with Han-uvulopalatopharyngoplasty and septoplasty, while cases in control group were only treated with Han-uvulopalatopharyngoplasty...
August 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/28822121/investigating-the-origin-of-acoustic-attenuation-in-liquid-foams
#4
Juliette Pierre, Camille Gaulon, Caroline Derec, Florence Elias, Valentin Leroy
Liquid foams are known to be highly efficient to absorb acoustic waves but the origin of the sound dissipation remains unknown. In this paper, we present low frequency (0.5-4kHz) experimental results measured with an impedance tube and we confront the recorded attenuations with a simple model that considers the foam as a concentrate bubbly liquid. In order to identify the influence of the different parameters constituting the foams we probe samples with different gases, and various liquid fractions and bubble size distributions...
August 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28821880/vocal-expression-of-emotional-valence-in-przewalski-s-horses-equus-przewalskii
#5
Anne-Laure Maigrot, Edna Hillmann, Callista Anne, Elodie F Briefer
Vocal expression of emotions has been suggested to be conserved throughout evolution. However, since vocal indicators of emotions have never been compared between closely related species using similar methods, it remains unclear whether this is the case. Here, we investigated vocal indicators of emotional valence (negative versus positive) in Przewalski's horses, in order to find out if expression of valence is similar between species and notably among Equidae through a comparison with previous results obtained in domestic horse whinnies...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821680/cortical-representations-of-speech-in-a-multi-talker-auditory-scene
#6
Krishna C Puvvada, Jonathan Z Simon
The ability to parse a complex auditory scene into perceptual objects is facilitated by a hierarchical auditory system. Successive stages in the hierarchy transform an auditory scene of multiple overlapping sources, from peripheral tonotopically-based representations in the auditory nerve, into perceptually distinct auditory-objects based representation in auditory cortex. Here, using magneto-encephalo-graphy (MEG) recordings from human subjects, both men and women, we investigate how a complex acoustic scene consisting of multiple speech sources is represented in distinct hierarchical stages of auditory cortex...
August 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28821642/super-optimal-perceptual-integration-suggests-a-place-based-representation-of-pitch-at-high-frequencies
#7
Bonnie K Lau, Anahita H Mehta, Andrew J Oxenham
Pitch, the perceptual correlate of sound repetition rate or frequency, plays an important role in speech perception, music perception, and listening in complex acoustic environments. Despite its perceptual importance, the neural mechanisms underlying pitch remain poorly understood. Although cortical regions responsive to pitch have been identified, little is known about how pitch information is extracted from the inner ear itself. The two primary theories of peripheral pitch coding involve stimulus-driven spike timing, or phase locking, in the auditory nerve (time code), and the spatial distribution of responses along the length of the cochlear partition (place code)...
August 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28821018/a-cross-language-study-of-acoustic-predictors-of-speech-intelligibility-in-individuals-with-parkinson-s-disease
#8
Yunjung Kim, Yaelin Choi
Purpose: The present study aimed to compare acoustic models of speech intelligibility in individuals with the same disease (Parkinson's disease [PD]) and presumably similar underlying neuropathologies but with different native languages (American English [AE] and Korean). Method: A total of 48 speakers from the 4 speaker groups (AE speakers with PD, Korean speakers with PD, healthy English speakers, and healthy Korean speakers) were asked to read a paragraph in their native languages...
August 18, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28820462/wettability-investigations-and-wet-transfer-enhancement-of-large-area-cvd-graphene-on-aluminum-nitride
#9
Marius Knapp, René Hoffmann, Volker Cimalla, Oliver Ambacher
The two-dimensional and virtually massless character of graphene attracts great interest for radio frequency devices, such as surface and bulk acoustic wave resonators. Due to its good electric conductivity, graphene might be an alternative as a virtually massless electrode by improving resonator performance regarding mass-loading effects. We report on an optimization of the commonly used wet transfer technique for large-area graphene, grown via chemical vapor deposition, onto aluminum nitride (AlN), which is mainly used as an active, piezoelectric material for acoustic devices...
August 18, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28820301/translabyrinthine-microsurgical-resection-of-small-vestibular-schwannomas
#10
Marc S Schwartz, Gregory P Lekovic, Mia E Miller, William H Slattery, Eric P Wilkinson
OBJECTIVE Translabyrinthine resection is one of a number of treatment options available to patients with vestibular schwannomas. Though this procedure is hearing destructive, the authors have noted excellent clinical outcomes for patients with small tumors. The authors review their experience at a tertiary acoustic neuroma referral center in using the translabyrinthine approach to resect small vestibular schwannomas. All operations were performed by a surgical team consisting of a single neurosurgeon and 1 of 7 neurotologists...
August 18, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28820002/applicability-of-the-arabic-version-of-vocal-tract-discomfort-scale-vtds-with-student-singers-as-professional-voice-users
#11
Wesam B Darawsheh, Yaser S Natour, Eve G Sada
AIM: This pilot study aimed to evaluate the internal consistency, convergent construct validity and criterion validity of Arabic version of the Vocal Tract Discomfort Scale (VTDS), and to investigate the correlation between the scores of the VTDS, the VHI and the acoustic measures of fundamental frequency (F0), shimmer, jitter and signal-to-noise ratio (SNR). METHODOLOGY: A cross-sectional study where 97 participants participated (47 males and 50 females) (mean age 20...
August 18, 2017: Logopedics, Phoniatrics, Vocology
https://www.readbyqxmd.com/read/28819203/differential-diagnostic-performance-of-acoustic-radiation-force-impulse-imaging-in-small-%C3%A2-20%C3%A2-mm-breast-cancers-is-it-valuable
#12
Si-Da Wang, Lei Wang, Zhi-Xian Li, Kang-Lai Wei, Xin-Hong Liao, Yuan-Yuan Chen, Xue Huang
To evaluate acoustic radiation force impulse (ARFI) inthe differential diagnosis of small (≤20 mm) solid breast lesions and identify the most efficient ARFI parameters. Conventional ultrasonography and ARFIwere performed in 120 patients with 121 small solid breast lesions. The area ratios (ARs) of the lesion on virtual touch tissue compared to B-mode were calculated. The shear wave velocity of the inner (SWVi) and boundary (SWVb) of the lesions and surrounding fatty tissue (SWVf) was measured. The ratio of SWVi to SWVf (SWVrat) was calculated...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819102/group-association-and-vocal-behaviour-during-foraging-trips-in-gentoo-penguins
#13
Noori Choi, Jeong-Hoon Kim, Nobuo Kokubun, Seongseop Park, Hosung Chung, Won Young Lee
In contrast to their terrestrial call, the offshore call of penguins during their foraging trips has been poorly studied due to the inaccessibility of the foraging site-the open ocean-to researchers. Here, we present the first description of the vocal behaviour of penguins in the open ocean and discuss the function of their vocal communication. We deployed an animal-borne camera on gentoo penguins (Pygoscelis papua) and recorded their foraging behaviour during chick guarding. From the video recordings, we collected 598 offshore calls from 10 individuals in two breeding seasons (2014-2015 and 2015-2016), and we analysed the acoustic characteristics and behavioural contexts of these calls, including diving patterns, group association events, and foraging behaviour...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818702/the-effects-of-cannabinoid-receptors-activation-and-glucocorticoid-receptors-deactivation-in-the-amygdala-and-hippocampus-on-the-consolidation-of-a-traumatic-event
#14
Noa Shoshan, Irit Akirav
Ample evidence demonstrates that fear learning contributes significantly to many anxiety pathologies including post-traumatic stress disorder (PTSD). The endocannabinoid (eCB) system may offer therapeutic benefits for PTSD and it is a modulator of the hypothalamic pituitary adrenal (HPA) axis. Here we compared the separated and combined effects of blocking glucocorticoid receptors (GRs) using the GR antagonist RU486 and enhancing CB1r signaling using the CB1/2 receptor agonist WIN55,212-2 in the CA1 and basolateral amygdala (BLA) on the consolidation of traumatic memory...
August 14, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28818692/suppression-of-irrelevant-sounds-during-auditory-working-memory
#15
Jyrki Ahveninen, Larry J Seidman, Wei-Tang Chang, Matti Hämäläinen, Samantha Huang
Auditory working memory (WM) processing in everyday acoustic environments depends on our ability to maintain relevant information online in our minds, and to suppress interference caused by competing incoming stimuli. A challenge in communication settings is that the relevant content and irrelevant inputs may emanate from a common source, such as a talkative conversationalist. An open question is how the WM system deals with such interference. Will the distracters become inadvertently filtered before processing for meaning because the primary WM operations deplete all available processing resources? Or are they suppressed post perceptually, through an active control process? We tested these alternative hypotheses by measuring magnetoencephalography (MEG), EEG, and functional MRI (fMRI) during a phonetic auditory continuous performance task...
August 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28817767/understanding-how-acoustic-vibrations-modulate-the-optical-response-of-plasmonic-metal-nanoparticles
#16
Aftab Ahmed, Matthew Pelton, Jeffrey R Guest
Measurements of acoustic vibrations in nanoparticles provide a unique opportunity to study mechanical phenomena at nanometer length scales and picosecond time scales. Vibrations in noble-metal nanoparticles have attracted particular attention, because they couple to plasmon resonances in the nanoparticles, leading to strong modulation of optical absorption and scattering. There are three mechanisms that transduce the mechanical oscillations into changes in the plasmon resonance: (1) changes in the nanoparticle geometry, (2) changes in electron density due to changes in the nanoparticle volume, and (3) changes in the interband transition energies due to compression / expansion of the nanoparticle (deformation potential)...
August 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28817081/multiphysics-simulation-of-low-amplitude-acoustic-wave-detection-by-piezoelectric-wafer-active-sensors-validated-by-in-situ-ae-fatigue-experiment
#17
Md Yeasin Bhuiyan, Victor Giurgiutiu
Piezoelectric wafer active sensors (PWAS) are commonly used for detecting Lamb waves for structural health monitoring application. However, in most applications of active sensing, the signals are of high-amplitude and easy to detect. In this article, we have shown a new avenue of using the PWAS transducer for detecting the low-amplitude fatigue-crack related acoustic emission (AE) signals. Multiphysics finite element (FE) simulations were performed with two PWAS transducers bonded to the structure. Various configurations of the sensors were studied by using the simulations...
August 17, 2017: Materials
https://www.readbyqxmd.com/read/28816690/complications-of-the-middle-cranial-fossa-approach-for-acoustic-neuroma-removal
#18
Matthias Scheich, Christian Ginzkey, Desiree Ehrmann Müller, Wafaa Shehata Dieler, Rudolf Hagen
OBJECTIVE: To analyze postoperative complications after microsurgery for acoustic neuroma (AN) via the middle fossa approach (MFA). MATERIALS AND METHODS: In total, 203 consecutive patients of a tertiary skull base referral center at a university hospital were included in this retrospective chart and database analysis. All patients had undergone primary microsurgery at the Otorhinolaryngology department via MFA between December 2005 and October 2014. Postoperative complications were documented during the inpatient stay and outpatient follow-up...
August 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/28816178/plasmon-modes-of-bilayer-molybdenum-disulfide-a-density-functional-study
#19
Zahra Torbatian, Reza Asgari
We explore the collective electronic excitations of bilayer molybdenum disulfide (MoS2 ) using the density functional theory together with the random phase approximation. The many-body dielectric function and electron energy-loss spectra are calculated using an ab initio based model involving material-realistic physical properties. The electron energy-loss function of bilayer MoS2 system is found to be sensitive to either electron or hole doping and it is owing to the fact that the Kohn-Sham band dispersions are not symmetric for energies above and below the zero Fermi level...
August 17, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28815940/production-and-perception-of-emotional-prosody-by-adults-with-autism-spectrum-disorder
#20
Daniel J Hubbard, Daniel J Faso, Peter F Assmann, Noah J Sasson
This study examined production and perception of affective prosody by adults with autism spectrum disorder (ASD). Previous research has reported increased pitch variability in talkers with ASD compared to typically developing (TD) controls in grammatical speaking tasks (e.g., comparing interrogative vs. declarative sentences), but it is unclear whether this pattern extends to emotional speech. In this study, speech recordings in five emotion contexts (angry, happy, interested, sad, and neutral) were obtained from 15 adult males with ASD and 15 controls (Experiment 1), and were later presented to 52 listeners (22 with ASD) who were asked to identify the emotion expressed and rate the level of naturalness of the emotion in each recording (Experiment 2)...
August 17, 2017: Autism Research: Official Journal of the International Society for Autism Research
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