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https://www.readbyqxmd.com/read/29038412/-effects-of-high-frequency-jet-ventilation-on-respiratory-failure-after-total-arch-replacement-due-to-acute-aortic-dissection-with-morbid-obesity-report-of-a-case
#1
Motoyuki Kumagai, Junichiro Nishizawa, Kazuhiro Takatoku, Takashi Ohba
A 55-year-old morbidly obese woman [body mass index (BMI) 51.2] developed acute type A aortic dissection, and she also presented with significant hypoxemia and hypercapnia. She underwent a successful emergency total arch replacement, but severe hypoxemia persisted and Pao2/Fio2 lowered to 71.9 mmHg. We therefore applied high frequency jet ventilation (HFJV), which soon improved the hypoxemia without hemodynamic compromise. HFJV was discontinued three days later, when her Pao2/Fio2 improved to 170.0 mmHg. Weaning from the respirator was initiated on postoperative day 13...
October 2017: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/28931881/contrasting-subtropical-pv-intrusion-frequency-and-their-impact-on-tropospheric-ozone-distribution-over-pacific-ocean-in-el-ni%C3%A3-o-and-la-ni%C3%A3-a-conditions
#2
Debashis Nath, Wen Chen, Hans-F Graf, Xiaoqiang Lan, Hainan Gong
Upper tropospheric equatorial westerly ducts over the Pacific Ocean are the preferred location for Rossby wave breaking events during boreal winter and spring. These subtropical wave breaking events lead to the intrusion of high PV (potential vorticity) air along the extra-tropical tropopause and transport ozone rich dry stratospheric air into the tropics. The intrusion frequency has strong interannual variability due to ENSO (El-Niño/Southern Oscillation), with more events under La-Niña and less under El-Niño conditions...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28927867/cardiovascular-autonomic-regulation-inflammation-and-pain-in-rheumatoid-arthritis
#3
Ahmed M Adlan, Jet J C S Veldhuijzen van Zanten, Gregory Y H Lip, Julian F R Paton, George D Kitas, James P Fisher
BACKGROUND: Rheumatoid arthritis (RA) is a chronic inflammatory condition characterised by reduced heart rate variability (HRV) of unknown cause. We tested the hypothesis that low HRV, indicative of cardiac autonomic cardiovascular dysfunction, was associated with systemic inflammation and pain. Given the high prevalence of hypertension (HTN) in RA, a condition itself associated with low HRV, we also assessed whether the presence of hypertension further reduced HRV in RA. METHODS: In RA-normotensive (n=13), RA-HTN (n=17), normotensive controls (NC; n=17) and HTN (n=16) controls, blood pressure and heart rate were recorded...
September 13, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28901229/intraoperative-high-frequency-jet-ventilation-is-equivalent-to-conventional-ventilation-during-patent-ductus-arteriosus-ligation
#4
Mackenzie Noonan, Joseph W Turek, John M Dagle, Steven J McElroy
BACKGROUND: Patent ductus arteriosus (PDA) treatment is typically pharmacologic, but if unsuccessful, surgical ligation is commonly performed. High-frequency jet ventilation (HFJV) is used at the University of Iowa Stead Family Children's Hospital for extremely low birth weight infants. Historically, neonates requiring PDA ligation were temporarily transferred to conventional ventilation (CV) prior to surgery. OBJECTIVE: The objective of this study was to determine whether conversion was necessary...
September 2017: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/28872134/coulomb-explosion-imaging-as-a-tool-to-distinguish-between-stereoisomers
#5
Martin Pitzer, Kilian Fehre, Maksim Kunitski, Till Jahnke, Lothar Schmidt, Horst Schmidt-Böcking, Reinhard Dörner, Markus Schöffler
This article shows how the COLTRIMS (Cold Target Recoil Ion Momentum Spectroscopy) or the "reaction microscope" technique can be used to distinguish between enantiomers (stereoisomers) of simple chiral species on the level of individual molecules. In this approach, a gaseous molecular jet of the sample expands into a vacuum chamber and intersects with femtosecond (fs) laser pulses. The high intensity of the pulses leads to fast multiple ionization, igniting a so-called Coulomb Explosion that produces several cationic (positively charged) fragments...
August 18, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28842641/non-equilibrium-plasma-jet-induced-thermo-acoustic-resistivity-imaging-for-higher-contrast-and-resolution
#6
Liang Guo, Linbo Li, Fanqing Dong, Wencong Jiang
A thermo-acoustic imaging modality induced by non-equilibrium atmospheric pressure plasma jet is reported. A tiny plasma jet is generated by a fast-rising pulsed dielectric barrier discharge and applied to the surface of the biological tissues. The pulsed conductive current induced by the conductive plasma jet is injected into the biological tissues. The Joule heating inside the tissue stimulates the ultrasound signals effectively. The amplitude of the ultrasound is related to the resistivity of the biological tissues near the contact point and takes the maximum at the certain conductivity of the certain frequency...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28839006/the-physiology-of-oral-whistling-a-combined-radiographic-and-mri-analysis
#7
Alba Miranda Azola, Jeffrey Palmer, Rachel Mulheren, Riccardo Hofer, Florian Fischmeister, W Tecumseh Fitch
The fluid mechanics of whistling involve the instability of an air jet, resultant vortex rings, and the interaction of these rings with rigid boundaries (2,4). Experimental models support the hypothesis that the sound in human whistling is generated by a Helmholtz resonator, suggesting that the oral cavity acts as a resonant chamber bounded by two orifices, posteriorly by raising the tongue to the hard palate, and anteriorly by pursed lips 2,2,3). However, the detailed anatomical changes in the vocal tract and their relation to the frequencies generated have not been described in the literature...
August 24, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28804874/high-frequency-jet-ventilation-for-motion-management-during-ablation-procedures-a-narrative-review
#8
REVIEW
K Galmén, P Harbut, J Freedman, J G Jakobsson
BACKGROUND: High frequency jet ventilation (HFJV) is a method of ventilation that has gained renewed interest over the recent years as it can reduce organ movement to near static conditions, thus enhancing surgical precision in minimal invasive procedures, for example, ablation procedures for atrial fibrillation and solid organ tumours. The aim of this review was to create a summary of the current evidence concerning the clinical use of HFJV for ablative procedures. METHOD: PubMed was searched for the key words high frequency ventilation and ablation January 1990-December 2016...
August 13, 2017: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/28774059/effects-of-acoustic-modulation-and-mixed-fuel-on-flame-synthesis-of-carbon-nanomaterials-in-an-atmospheric-environment
#9
Wei-Chieh Hu, Shanti Kartika Sari, Shuhn-Shyurng Hou, Ta-Hui Lin
In this study, methane-ethylene jet diffusion flames modulated by acoustic excitation in an atmospheric environment were used to investigate the effects of acoustic excitation frequency and mixed fuel on nanomaterial formation. Acoustic output power was maintained at a constant value of 10 W, while the acoustic excitation frequency was varied (f = 0-90 Hz). The results show that the flame could not be stabilized on the port when the ethylene volume concentration (ΩE) was less than 40% at f = 10 Hz, or when ΩE = 0% (i...
November 18, 2016: Materials
https://www.readbyqxmd.com/read/28733016/interaction-between-cavitation-microbubble-and-cell-a-simulation-of-sonoporation-using-boundary-element-method-bem
#10
Xiasheng Guo, Chenliang Cai, Guangyao Xu, Yanye Yang, Juan Tu, PinTong Huang, Dong Zhang
Sonoporation has been widely accepted as a significant tool for gene delivery as well as some bio-effects like hemolysis, bringing in high demands of looking into its underlying mechanism. A two-dimensional (2D) boundary element method (BEM) model was developed to investigate microbubble-cell interaction, especially the morphological and mechanical characteristics around the close-to-bubble point (CP) on cell membrane. Based on time evolution analysis of sonoporation, detailed information was extracted from the model for analysis, including volume expansion ratio of the bubble, areal expansion ratio of the cell, jet velocity and CP displacement...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28720845/pulsation-of-electrified-jet-in-capillary-microfluidics
#11
Xiong Li, Shanshan Wei, Liucheng Chen, Gang Qu, Huisheng Zhang, Zhou Liu, Liqiu Wang, Tiantian Kong, Tianfu Wang
In this work, we investigate the pulsation of an electrically charged jet surrounded by an immiscible dielectric liquid in flow-focusing capillary microfluidics. We have characterized a low-frequency large-amplitude pulsation and a high-frequency small-amplitude pulsation, respectively. The former, due to the unbalanced charge and fluid transportation is responsible for generating droplets with a broad size distribution. The latter is intrinsic and produces droplets with a relatively narrow size distribution...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28682620/new-biotechnological-microencapsulating-methodology-utilizing-individualized-gradient-screened-jet-laminar-flow-techniques-for-pancreatic-%C3%AE-cell-delivery-bile-acids-support-cell-energy-generating-mechanisms
#12
Armin Mooranian, Rebecca Negrulj, Ryu Takechi, Emma Jamieson, Grant Morahan, Hani Al-Salami
In previous studies, we developed a new technique (ionic gelation vibrational jet flow; IGVJF) in order to encapsulate pancreatic β-cells, for insulin in vivo delivery, and diabetes treatment. The fabricated microcapsules showed good morphology but limited cell functions. Thus, this study aimed to optimize the IGVJF technique, by utilizing integrated electrode tension, coupled with high internal vibration, jet-flow polymer stream rate, ionic bath-gelation concentrations, and gelation time stay. The study also utilized double inner/outer nozzle segmented-ingredient flow of microencapsulating dispersion, in order to form β-cell microcapsules...
August 7, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28667960/a-model-combustor-for-studying-a-reacting-jet-in-an-oscillating-crossflow
#13
Christopher A Fugger, Rohan M Gejji, J Enrique Portillo, Yen Yu, Robert P Lucht, William E Anderson
This paper discusses a novel model combustion experiment that was built for studying the structure and dynamics of a reacting jet in an unsteady crossflow. A natural-gas-fired dump combustor is used to generate and sustain an acoustically oscillating vitiated flow that serves as the crossflow for transverse jet injection. Unlike most other techniques that are limited in operating pressure or acoustic amplitude, this method of generating an unsteady flow field is demonstrated at a pressure of 10 atm with peak-to-peak oscillation amplitudes approaching 20% of the mean pressure...
June 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28646006/high-frequency-jet-ventilation-in-preterm-infants-is-there-still-room-for-it
#14
EDITORIAL
Mário Ferreira Carpi
No abstract text is available yet for this article.
July 2017: Respiratory Care
https://www.readbyqxmd.com/read/28607397/oscillatory-bursting-of-gel-fuel-droplets-in-a-reacting-environment
#15
Ankur Miglani, Purushothaman Nandagopalan, Jerin John, Seung Wook Baek
Understanding the combustion behavior of gel fuel droplets is pivotal for enhancing burn rates, lowering ignition delay and improving the operational performance of next-generation propulsion systems. Vapor jetting in burning gel fuel droplets is a crucial process that enables an effective transport (convectively) of unreacted fuel from the droplet domain to the flame zone and accelerates the gas-phase mixing process. Here, first we show that the combusting ethanol gel droplets (organic gellant laden) exhibit a new oscillatory jetting mode due to aperiodic bursting of the droplet shell...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28588405/aeroacoustic-catastrophes-upstream-cusp-beaming-in-lilley-s-equation
#16
J T Stone, R H Self, C J Howls
The downstream propagation of high-frequency acoustic waves from a point source in a subsonic jet obeying Lilley's equation is well known to be organized around the so-called 'cone of silence', a fold catastrophe across which the amplitude may be modelled uniformly using Airy functions. Here we show that acoustic waves not only unexpectedly propagate upstream, but also are organized at constant distance from the point source around a cusp catastrophe with amplitude modelled locally by the Pearcey function. Furthermore, the cone of silence is revealed to be a cross-section of a swallowtail catastrophe...
May 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28587141/lem-characterization-of-synthetic-jet-actuators-driven-by-piezoelectric-element-a-review
#17
Matteo Chiatto, Francesco Capuano, Gennaro Coppola, Luigi de Luca
In the last decades, Synthetic jet actuators have gained much interest among the flow control techniques due to their short response time, high jet velocity and absence of traditional piping, which matches the requirements of reduced size and low weight. A synthetic jet is generated by the diaphragm oscillation (generally driven by a piezoelectric element) in a relatively small cavity, producing periodic cavity pressure variations associated with cavity volume changes. The pressured air exhausts through an orifice, converting diaphragm electrodynamic energy into jet kinetic energy...
May 26, 2017: Sensors
https://www.readbyqxmd.com/read/28527463/sub-doppler-infrared-spectroscopy-of-ch2oh-radical-in-a-slit-supersonic-jet-vibration-rotation-tunneling-dynamics-in-the-symmetric-ch-stretch-manifold
#18
Michael D Schuder, Fang Wang, Chih-Hsuan Chang, David J Nesbitt
The sub-Doppler CH-symmetric stretch (ν3) infrared absorption spectrum of a hydroxymethyl (CH2OH) radical is observed and analyzed with the radical formed in a slit-jet supersonic discharge expansion (Trot = 18 K) via Cl atom mediated H atom abstraction from methanol. The high sensitivity of the spectrometer and reduced spectral congestion associated with the cooled expansion enable first infrared spectroscopic observation of hydroxymethyl transitions from both ± symmetry tunneling states resulting from large amplitude COH torsional motion...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28433021/to-kink-or-not-a-search-for-long-chain-cumulenones-using-microwave-spectral-taxonomy
#19
Michael C McCarthy, Luyao Zou, Marie-Aline Martin-Drumel
A systematic search for carbon-chain cumulenones beyond H2C4O has been undertaken using microwave spectral taxonomy in combination with a pulsed jet discharge source. No evidence was found for the C2υ isomer of H2C5O or its longer derivatives, but HC(O)C4H, the longer variant of propynal, HC(O)CCH, was identified instead. Its rotational and leading centrifugal distortion constants have been derived to high accuracy from detection of both a- and b-type lines; those below 40 GHz were measured using a Fabry-Perot cavity, while lines between 40 and 72 GHz were recorded by double resonance techniques...
April 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28377402/assessing-initial-response-to-high-frequency-jet-ventilation-in-premature-infants-with-hypercapnic-respiratory-failure
#20
Craig R Wheeler, Craig D Smallwood, Iris O'Donnell, Daniel Gagner, Martha C Sola-Visner
BACKGROUND: High-frequency jet ventilation (HFJV) has been used in conjunction with conventional ventilation for infants with respiratory failure. We sought to identify parameters that were associated with successful application of HFJV in patients with hypercapnic respiratory failure. METHODS: A single-center, retrospective review of infants who received HFJV was conducted. Subjects were enrolled if birthweight was ≤2,000 g and capillary PCO2 was ≥55 mm Hg...
April 4, 2017: Respiratory Care
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