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Relevant bibliographies by topics / Flow shunting

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Academic literature on the topic 'Flow shunting'

Author: Grafiati

Published: 28 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Flow shunting"

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Smolich, Joseph J., Kelly R. Kenna, Michael M. H. Cheung, and Jonathan P. Mynard. "Brief asphyxial state following immediate cord clamping accelerates onset of left-to-right shunting across the ductus arteriosus after birth in preterm lambs." Journal of Applied Physiology 128, no. 2 (2020): 429–39. http://dx.doi.org/10.1152/japplphysiol.00559.2019.

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Reversal of shunting across the ductus arteriosus from right-to-left to left-to-right is a characteristic feature of the birth transition. Given that immediate cord clamping (ICC) followed by an asphyxial cord clamp-to-ventilation (CC-V) interval may augment left ventricular (LV) output and central blood flows after birth, we tested the hypothesis that an asphyxial CC-V interval accelerates the onset of postnatal left-to-right ductal shunting. High-fidelity central blood flow signals were obtained in anesthetized preterm lambs (gestation 128 ± 2 days) after ICC followed by a nonasphyxial (∼40

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Javlé, P., J. Yates, H. G. Kynaston, K. F. Parsons, and S. A. Jenkins. "Hepatosplanchnic haemodynamics and renal blood flow and function in rats with liver failure." Gut 43, no. 2 (1998): 272–79. http://dx.doi.org/10.1136/gut.43.2.272.

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Background—Massive liver necrosis, characteristic of acute liver failure, may affect hepatosplanchnic haemodynamics, and contribute to the alterations in renal haemodynamics and function.Aims—To investigate the relation between hepatosplanchnic haemodynamics, including portal systemic shunting, and renal blood flow and function in rats with acute liver failure.Methods—Liver failure was induced in male Wistar rats by intraperitoneal injection of 1.1 g/kg ofd(+)-galactosamine hydrochloride. The parameters assessed included: systemic, hepatosplanchnic, and renal blood flow (57Co microsphere metho

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Shepherd, A. P., and J. W. Kiel. "A model of countercurrent shunting of oxygen in the intestinal villus." American Journal of Physiology-Heart and Circulatory Physiology 262, no. 4 (1992): H1136—H1142. http://dx.doi.org/10.1152/ajpheart.1992.262.4.h1136.

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This report describes a mathematical model of the countercurrent shunting (CCS) of O2 in the intestinal villus. The anatomic basis for the model is the close proximity of the arteriole and venule between which O2 is free to diffuse. The model divides the villus into four segments from base to tip. Steady-state equations describe the convective and diffusive fluxes of O2 in the arteriolar, capillary, and tissue compartments within each segment. Longitudinal diffusion along the length of the villus is assumed to be negligible. Simulations with the model led to the following observations: 1) CCS

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Zierer, Andreas, Spencer J. Melby, Rochus K. Voeller, and Marc R. Moon. "Interatrial shunt for chronic pulmonary hypertension: differential impact of low-flow vs. high-flow shunting." American Journal of Physiology-Heart and Circulatory Physiology 296, no. 3 (2009): H639—H644. http://dx.doi.org/10.1152/ajpheart.00496.2008.

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The purpose of the present study was to determine for the first time the qualitative and quantitative impact of varying degrees of interatrial shunting on right heart dynamics and systemic perfusion in subjects with chronic pulmonary hypertension (CPH). Eight dogs underwent 3 mo of progressive pulmonary artery banding, following which right atrial and ventricular end-systolic and end-diastolic pressure-volume relations were calculated using conductance catheters. An 8-mm shunt prosthesis was inserted between the superior vena cava and left atrium, yielding a controlled model of atrial septosto

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Smolich, Joseph J., Kelly R. Kenna, and Jonathan P. Mynard. "Retrograde lower body arterial reservoir discharge underlies rapid reversal of ductus arteriosus shunting after early cord clamping at birth in preterm lambs." Journal of Applied Physiology 120, no. 4 (2016): 399–407. http://dx.doi.org/10.1152/japplphysiol.00794.2015.

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Arterial reservoir (“windkessel”) function, whereby a part of left ventricular (LV) output is stored in elastic arteries during systole and discharged in diastole, is a well-established physiological phenomenon. However, its role in rapid reversal (to left-to-right) and a systolic-to-diastolic shift of shunting across the ductus arteriosus after birth is unknown. To address this question, ductal and aortic isthmus flows were measured with high-fidelity transit-time probes in six anesthetized preterm fetal lambs before and after cord clamping and subsequent early mechanical ventilation and for

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Diller, Gerhard-Paul, Astrid E. Lammers, Sheila G. Haworth, et al. "A modelling study of atrial septostomy for pulmonary arterial hypertension, and its effect on the state of tissue oxygenation and systemic blood flow." Cardiology in the Young 20, no. 1 (2010): 25–32. http://dx.doi.org/10.1017/s1047951109991855.

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AbstractAtrial septostomy is performed in patients with severe pulmonary arterial hypertension, and has been shown to improve symptoms, quality of life and survival. Despite recognized clinical benefits, the underlying pathophysiologic mechanisms are poorly understood. We aimed to assess the effects of right-to-left shunting on arterial delivery of oxygen, mixed venous content of oxygen, and systemic cardiac output in patients with pulmonary arterial hypertension and a fixed flow of blood to the lungs. We formulated equations defining the mandatory relationship between physiologic variables an

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Mascalchi, M., G. Arnetoli, D. Inzitari, et al. "Cine-MR Imaging of Aqueductal CSF Flow in Normal Pressure Hydrocephalus Syndrome before and after CSF Shunt." Acta Radiologica 34, no. 6 (1993): 586–92. http://dx.doi.org/10.1177/028418519303400612.

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Reproducibility of the aqueductal CSF signal intensity on a gradient echo cine-MR sequence exploiting through plane inflow enhancement was tested in 11 patients with normal or dilated ventricles. Seven patients with normal pressure hydrocephalus (NPH) syndrome were investigated with the sequence before and after CSF shunting. Two patients exhibiting central flow void within a hyperintense aqueductal CSF improved after surgery and the flow void disappeared after shunting. One patient with increased maximum and minimum aqueductal CSF signal as compared to 18 healthy controls also improved and th

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Ordia, Joe I., Ronald W. Mortara, and Edward L. Spatz. "Audible cerebrospinal fluid flow through a ventriculoperitoneal shunt." Journal of Neurosurgery 67, no. 3 (1987): 460–62. http://dx.doi.org/10.3171/jns.1987.67.3.0460.

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Smolich, Joseph J., Kelly R. Kenna, and Jonathan P. Mynard. "Antenatal betamethasone augments early rise in pulmonary perfusion at birth in preterm lambs: role of ductal shunting and right ventricular outflow distribution." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 316, no. 6 (2019): R716—R724. http://dx.doi.org/10.1152/ajpregu.00318.2018.

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The glucocorticosteroid betamethasone is routinely administered via maternal intramuscular injection to enhance fetal lung maturation before anticipated preterm birth. Although antenatal betamethasone increases fetal pulmonary arterial (PA) blood flow, whether this agent alters the contribution of 1) right ventricular (RV) output or 2) left-to-right shunting across the ductus arteriosus to rises in PA blood flow after preterm birth is unknown. To address this question, anesthetized control ( n = 7) and betamethasone-treated ( n = 7) preterm fetal lambs (gestation 127 ± 1 days, means ± SD) were

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Hawkins, P. A., M. R. DeJoseph, and R. A. Hawkins. "Eliminating metabolic abnormalities of portacaval shunting by restoring normal liver blood flow." American Journal of Physiology-Endocrinology and Metabolism 270, no. 6 (1996): E1037—E1042. http://dx.doi.org/10.1152/ajpendo.1996.270.6.e1037.

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Portacaval shunting causes a variety of anatomic, metabolic, and physiological changes. However, it has not been determined whether, and to what degree, these changes are permanent after a sustained period of shunting. We prepared three groups of rats for study of the recovery process. One group had side-to-side shunts for 3 wk, one group had side-to-side shunts for 2 wk followed by the restoration of normal liver circulation for 1 wk, and one group (control) had sham operations. Side-to-side shunting causes liver atrophy, increased plasma ammonia, altered plasma and brain amino acid spectra,

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Dissertations / Theses on the topic "Flow shunting"

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Šišmiš, Lukáš. "Optimalizace IDS/IPS systému Suricata." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2021. http://www.nusl.cz/ntk/nusl-445503.

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V dnešnom svete zrýchľujúcej sa sieťovej prevádzky je potrebné držať krok v jej monitorovaní . Dostatočný prehľad o dianí v sieti dokáže zabrániť rozličným útokom na ciele nachádzajúce sa v nej . S tým nám pomáhajú systémy IDS, ktoré upozorňujú na udalosti nájdené v analyzovanej prevádzke . Pre túto prácu bol vybraný systém Suricata . Cieľom práce je vyladiť nastavenia systému Suricata s rozhraním AF_PACKET pre optimálnu výkonnosť a následne navrhnúť a implementovať optimalizáciu Suricaty . Výsledky z meraní AF_PACKET majú slúžiť ako základ pre porovnanie s navrhnutým vylepšením . Navrhovaná o

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Ostlin, Janice Christine. "Cardiac shunting and blood flow distribution in the American alligator (ALLIGATOR MISSISSIPPIENSIS)." Thesis, 1997. http://hdl.handle.net/2429/6562.

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The cardiac and circulatory anatomy of the American alligator (Alligator mississippiensis) is unique in that both the cardiac and systemic circulatory systems display anatomical divisions. This situation may also be of physiological significance to the animal. The purpose of this study was to determine regional blood flow distribution in the alligator, with respect to cardiac blood flow patterns. Animals were instrumented with flow and pressure recorders, and monitored over extended time periods. Fluorescent microspheres capable of being entrapped in tissue capillary beds were introduce

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Li, Yi-Jian, and 李宜堅. "Cerebral Blood Flow Velocity and Vasomotor Reactivity before and after Shunting Surgery in Patients with Normal Pressure Hydrocephalus." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/24831229639771129866.

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Lee, E.-Jian, and 李宜堅. "Cerebral Blood Flow Velocity and Vasomotor Reactivity before and after Shunting Surgery in Patients with Normal Pressure Hydrocephalus." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/48826035231997811722.

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碩士<br>國立成功大學<br>醫學工程學系<br>86<br>ABSTRACTOBJECTIVE:The aim of the study was to evaluate the hemodynamic changes and their correlationwith the clinical results by measurement of cerebral blood flow velocity (CBFV) andcerebral vasomotor reserve before and after shunt placement in normal pressurehydrocephalus (NPH).METHODS:Ten demented patients with clinical signs suggestive of NPH received examinationsof blood flow velocity (BFV) and vasomotor reactivity (VMR) of the anterior cerebralartery (A

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Book chapters on the topic "Flow shunting"

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Hoekstra, A., and M. Sussman. "Hydrocephalus Management With a Flow-Control Shunt: Overdrainage and Proximal Obstruction: Controllable Complications of Shunting." In Biomedical and Life Physics. Vieweg+Teubner Verlag, 1996. http://dx.doi.org/10.1007/978-3-322-85017-1_30.

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Sirakov, Alexander, Marta Aguilar Pérez, Klaus Terstegge, Erich Donauer, and Hans Henkes. "Vertebral Artery Junction Aneurysm: Brain Stem Compression due to a Giant Dolichoectatic and Partially Thrombosed Aneurysm Involving the Intradural Segments of Both Vertebral Arteries and the Proximal Trunk of the Basilar Artery; Asymptomatic Thrombosis of the Vertebral Artery Junction After Ventricle Shunting; Endovascular Disconnection of the Vertebrobasilar Junction Using Coil Occlusion of Both V4 Segments and Flow Diverter Stent Deployment from Both Posterior Inferior Cerebellar Arteries to the Afferent V4 Segments; Long-Term Follow-Up Showing Aneurysm Shrinkage and Good Clinical Outcome." In The Aneurysm Casebook. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-77827-3_156.

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Sirakov, Alexander, Marta Aguilar Pérez, Klaus Terstegge, Erich Donauer, and Hans Henkes. "Vertebral Artery Junction Aneurysm: Brain Stem Compression due to a Giant Dolichoectatic and Partially Thrombosed Aneurysm Involving the Intradural Segments of Both Vertebral Arteries and the Proximal Trunk of the Basilar Artery; Asymptomatic Thrombosis of the Vertebral Artery Junction After Ventricle Shunting; Endovascular Disconnection of the Vertebrobasilar Junction Using Coil Occlusion of Both V4 Segments and Flow Diverter Stent Deployment from Both Posterior Inferior Cerebellar Arteries to the Afferent V4 Segments; Long-Term Follow-Up Showing Aneurysm Shrinkage and Good Clinical Outcome." In The Aneurysm Casebook. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-70267-4_156-1.

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Baird, Lissa C. "Vein of Galen Malformation." In Pediatric Neurosurgery. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780190617073.003.0018.

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Vein of Galen malformations consist of multiple arteriovenous fistulas shunting arterial blood into the persistent embryonic prosencephalic vein of Markowski. The mural type are characterized by fewer fistulas and commonly present with progressive hydrocephalus. The choroidal type malformations have more complex and numerous fistulas, have higher flow, and commonly present with severe high-output cardiac failure. Transfemoral transarterial embolization at the fistula sites of the malformation for complete obliteration of arteriovenous shunting is the optimal intervention. An interdisciplinary approach is critical from the time of diagnosis through the post-treatment follow-up period. Sequelae of cardiac failure and end-organ damage may be minimized with early endovascular intervention when indicated and complete embolization when feasible.

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Witschey, Walter RT, and Michael Markl. "Blood flow and phase contrast CMR." In The EACVI Textbook of Cardiovascular Magnetic Resonance, edited by Massimo Lombardi, Sven Plein, Steffen Petersen, et al. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198779735.003.0018.

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Flow-sensitive cardiovascular magnetic resonance (CMR) is a widespread non-invasive imaging method for the clinical evaluation of blood flow in cardiovascular disease. The basic principle of phase contrast magnetic resonance imaging (MRI) is the use of bipolar gradients to encode blood velocity in the magnetic resonance (MR) signal phase. The most common type of flow-encoded scan two-dimensional (2D) cine phase contrast CMR with single-direction velocity encoding is clinically used to quantify cardiovascular flow and velocities. Trade-offs between resolution (temporal and spatial) and acquisition time are illustrated in the context of patient examination, considering high-velocity jet flow, patient breath-hold duration, respiratory motion artefacts, and patient comfort. In addition, the chapter describes how the velocity-to-noise ratio and aliasing behaviour of flow measurements are affected by the velocity-encoding sensitivity (VENC). An advantage of phase contrast MR is that flow encoding may be performed in all three spatial dimensions, improving peak velocity measurement accuracy. Several clinical applications (aortic stenosis, coarctation, and ventricular shunting) and best practices are explained in detail with illustrations. Analysis and post-processing of phase contrast data are summarized. The progressive development of advanced phase contrast techniques is discussed by adding incremental complexity, starting with 2D phase contrast (2D spatial and one-dimensional velocity) and ending with four-dimensional flow encoding (three-dimensional spatial and velocity). Methods to accelerate phase contrast, such as parallel imaging, are briefly discussed. Finally, the chapter concludes with a summary of emerging topics for accelerated scanning and special applications such as compressed sensing, real-time phase contrast, and ultra-short echo time imaging.

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Conference papers on the topic "Flow shunting"

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Zhao, Jun, and Qiyuan Peng. "Integrated Wagon-Flow Allocation and Shunting Locomotive Scheduling Problem at Railyard with Multiple Locomotives." In Inernational Conference of Logistics Engineering and Management 2012. American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412602.0020.

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Zhang, Yi, and Jun Zhao. "A New Model for Solving Integrated Wagon-Flow Allocation and Shunting Locomotive Scheduling Problem at Railyard." In Third International Conference on Transportation Engineering (ICTE). American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41184(419)145.

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Mu, Feng, Ciguang Wang, and Yun Jing. "Model of Taking-Out and Placing-In Shunting of Non-Through Wagon Flow on Branch-Shaped Sidings." In Second International Conference on Transportation Engineering. American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41039(345)119.

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Collet, Manuel, Ken A. Cunefare, Massimo Ruzzene, et al. "Beams and Plates Vibroacoustic Energy Diffusion Optimization by Mean of Distributed Shunted Piezoelectric Patches." In ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1256.

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The paper proposes a synthesis of different new methodologies for developing a distributed, integrated shunted piezo composite for beams and plates applications able to modify the structural vibro acoustical impedance of the passive supporting structure so as to absorb or reflect incidental power flow. This design implements tailored structural responses, through integrated passive and active features, and offers the potential for higher levels of vibration isolation as compared to current designs. Novel active and passive shunting configurations will be investigated to reduce vibrations such

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Biglino, Giovanni, Ethan Kung, Adam Dorfman, et al. "A Hemi Fontan Operation Performed by an Engineer: Considerations on Virtual Surgery." In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14451.

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Single ventricle circulation, characterized at birth by a rudimentary or absent left or right ventricle, presents a challenging and life-threatening physiological scenario. Surgical palliation aims to restore the balance between systemic and pulmonary blood flow and is staged, each of the three stages presenting the surgeon with different options: - Stage 1 (Norwood procedure) involves different types of shunting to source pulmonary blood flow, or recently a hybrid approach [1]; - Stage 2 can involve a superior cavopulmonary connection (Glenn operation) or patching between the right atrium and

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Collet, Manuel, Morvan Ouisse, Mohammed Ichchou, and Roger Ohayon. "Semi-Active Optimization of 2D Wave’s Dispersion Into Shunted Piezocomposite Systems for Controlling Acoustic Interaction." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5018.

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In this paper, we present an application of the Floquet-Bloch theorem in the context of electrodynamics for vibroacoustic power flow optimization by mean of distributed and shunted piezoelectric patches. The main purpose of this work is first to propose a dedicated numerical approach able to compute the multi-modal wave dispersions curves into the whole first Brillouin zone for periodically distributed 2D shunted piezomechanical systems. By using two specific indicators evaluating the evanescent part of Bloch’s waves and the induced electronic damping, we optimize the piezoelectric shunting el

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Cross, Charles J., and Sanford Fleeter. "Shunted Piezoelectric Control of Airfoil Vibrations." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-385.

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The application of shunted piezoelectric elements to provide passive structural damping is investigated by means of experiments performed in the Purdue High Speed Axial Compressor Research Facility. Piezoelectric elements are bonded to three airfoils in the stator row. This airfoil is excited by the wakes generated by an upstream rotor. As the wakes drive the airfoil vibrations, the piezoelectrics experience a strain and in response produce an electric field. Tuned electrical circuits connected to the piezoelectrics as shunts dissipate this electrical energy, with multiple shunting techniques

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Swim, Benjamin M., Julie A. Reyer, Martin J. Morris, and Julian J. Lin. "Development of an Apparatus for the Testing of Hydrocephalic Shunts." In ASME 2006 Frontiers in Biomedical Devices Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/nanobio2006-18025.

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This abstract summarizes the development of a new apparatus designed to test hydrocephalic shunts. Hydrocephalus is a medical condition most commonly characterized by above-normal intracranial pressure (ICP) that occurs when a patient’s head cannot properly regulate cerebrospinal fluid (CSF) volume in the head. The condition is generally caused by a blockage to flow of CSF in the normal biological pathways. This can result from a birth defect, trauma, or disease. In a hydrocephalic patient, excess fluid builds up in the ventricles resulting in increased mechanical stress and physical deformati

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Tateo, F., M. Collet, M. Ouisse, M. N. Ichchou, and K. A. Cunefare. "Design and Experimental Validation of a Metacomposite Made of an Array of Piezopatches Shunted on Negative Capacitance Circuits for Vibroacoustic Control." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3182.

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In the last few decades, researchers have given a lot of attention to new engineered materials with the purpose of developing new technologies and devices such as mechanical filters, low frequency sound and vibration isolators, and acoustic waveguides. For instance, elastic phononic crystals may come to mind. They are materials with elastic or fluid inclusions inside a matrix made of an elastic solid. The anomalous behavior in phononic crystals arises from interference of waves propagating within an inhomogeneous material. The inclusions inside the matrix cause strong modifications of scatteri

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