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https://www.readbyqxmd.com/read/29221295/contralateral-thoracoscopic-lobectomy-in-postlobectomy-patients
#1
Manabu Yasuda, Ryoichi Nakanishi, Shinji Shinohara, Masataka Mori, Syuhei Ashikari, Tsunehiro Oyama, Takeshi Hanagiri
Background: It is difficult to perform thoracoscopic lobectomy in patients with a history of contralateral lobectomy, as stable oxygenation is not always maintained under conditions of one-lung ventilation during surgery. Methods: This study evaluated 14 patients who underwent thoracoscopic lobectomy after previously undergoing contralateral lobectomy at a single institution between 2008 and 2015. Results: Among 14 patients who had previously received contralateral lobectomy, 4 were unable to maintain sufficient perioperative oxygenation with usual one-lung ventilation...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29189750/multi-source-generation-mechanisms-for-low-frequency-noise-induced-by-flood-discharge-and-energy-dissipation-from-a-high-dam-with-a-ski-jump-type-spillway
#2
Jijian Lian, Xiaoqun Wang, Wenjiao Zhang, Bin Ma, Dongming Liu
As excess water is discharged from a high dam, low frequency noise (air pulsation lower than 10 Hz, LFN) is generated and propagated in the surrounding areas, causing environmental hazards such as the vibration of windows and doors and the discomfort of local residents. To study the generation mechanisms and key influencing factors of LFN induced by flood discharge and energy dissipation from a high dam with a ski-jump type spillway, detailed prototype observations and analyses of LFN are carried out. The discharge flow field is simulated and analyzed using a gas-liquid turbulent flow model...
November 30, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29173320/pulmonary-artery-pressures-in-school-age-children-born-prematurely
#3
Sanja Zivanovic, Kuberan Pushparajah, Sandy Calvert, Neil Marlow, Reza Razavi, Janet L Peacock, Anne Greenough
OBJECTIVES: To test the hypothesis that pulmonary artery pressures were higher in school aged children born extremely premature than those born at term. We also wanted to assess whether pulmonary artery pressures differed between children born prematurely with or without bronchopulmonary dysplasia (BPD) or between those randomized in the neonatal period to different ventilation modes. STUDY DESIGN: Transthoracic echocardiography was performed on 193 children born extremely premature (106 had BPD) and 110 children born at term when they were 11-14 years of age...
December 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/29161293/high-intensity-focused-ultrasound-ablation-around-the-tubing
#4
Jun Yang Siu, Chenhui Liu, Yufeng Zhou
High-intensity focused ultrasound (HIFU) has been emerging as an effective and noninvasive modality in cancer treatment with very promising clinical results. However, a small vessel in the focal region could be ruptured, which is an important concern for the safety of HIFU ablation. In this study, lesion formation in the polyacrylamide gel phantom embedded with different tubing (inner diameters of 0.76 mm and 3 mm) at varied flow speeds (17-339 cm/s) by HIFU ablation was photographically recorded. Produced lesions have decreased length (~30%) but slightly increased width (~6%) in comparison to that without the embedded tubing...
2017: PloS One
https://www.readbyqxmd.com/read/29094601/droplet-formation-by-rupture-of-vibration-induced-interfacial-fingers
#5
Sze Yi Mak, Youchuang Chao, Shakurur Rahman, Ho Cheung Shum
By imposing vibration to a core-annular flow of an aqueous two-phase system (ATPS) with ultralow interfacial tension, we observe a liquid finger protruding from the interface of an expanding jet. We find that the protruded finger breaks up only when its length-to-width ratio exceeds a threshold value. The breakup follows a constant wavelength-to-width ratio that is consistent with that of breakup under Rayleigh-Plateau instability. The mechanism is applicable to aqueous two-phase systems with a large range of viscosity ratios...
November 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29091044/dispersion-risk-associated-with-surgical-debridement-devices
#6
Mark Granick, Liel Rubinsky, Chaitra Parthiban, Mayilvahanan Shanmugam, Narayanan Ramasubbu
INTRODUCTION: Surgical instrumentation is now available to facilitate wound debridement. The 2 primary options involve different energy applications, but both have the potential to spray. The Versajet II (Smith & Nephew, London, UK) utilizes a high-powered water jet to disrupt tissue and remove debris by means of the Venturi effect. The SonicVac (Misonix, Farmingdale, NY) is a direct-contact, low-frequency ultrasound debriding device. It delivers a high-energy ultrasound to a wound surface via a fluid medium, causing bubble cavitation, a physical effect of rapid pressure waves causing bubbles to form and implode that releases mechanical energy...
October 2017: Wounds: a Compendium of Clinical Research and Practice
https://www.readbyqxmd.com/read/29060368/a-gaussian-process-regression-model-for-walking-speed-estimation-using-a-head-worn-imu
#7
Shaghayegh Zihajehzadeh, Edward J Park
Miniature inertial sensors mainly worn on waist, ankle and wrist have been widely used to measure walking speed of the individuals for lifestyle and/or health monitoring. Recent emergence of head-worn inertial sensors in the form of a smart eyewear (e.g. Recon Jet) or a smart ear-worn device (e.g. Sensixa e-AR) provides an opportunity to use these sensors for estimation of walking speed in real-world environment. This work studies the feasibility of using a head-worn inertial sensor for estimation of walking speed...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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