keyword
MENU ▼
Read by QxMD icon Read
search

systemic filling pressure

keyword
https://www.readbyqxmd.com/read/28513885/biomechanical-function-of-a-balloon-nucleus-pulposus-replacement-system-a-human-cadaveric-spine-study
#1
Taekyeong Lee, Tae-Hong Lim, Sang-Heon Lee, Joo-Han Kim, Junghwa Hong
With recent advances in motion-sparing techniques in spine surgery, disc nucleus replacement (DNR) has been introduced as a viable method to restore the biomechanical functions of the spine. Several methods of DNR have been proposed in the literature. However, the risk of device migration or extrusion is a major issue that should be addressed for a successful DNR. DNR using a balloon nucleus (BN) filled with pressurized fluid may be capable of reducing such risks while preserving the advantages of DNR. The objective of this study was to investigate the biomechanical functionalities of the human cadaveric lumbar motion segments with a custom made BN filled with saline at internal fluid pressure of 0...
May 17, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28508801/adaptive-pump-speed-algorithms-to-improve-exercise-capacity-in-patients-supported-with-a-left-ventricular-assist-device
#2
Thomas Schmidt, Nils Reiss, Ezin Deniz, Christina Feldmann, Andreas Hein, Jan-Dirk Hoffmann, Jenny Inge Röbesaat, Jan Dieter Schmitto, Detlev Willemsen, Frerk Müller-von Aschwege
For the treatment of terminal heart failure, the therapy with left-ventricular assist devices has already been established. In the systems used today, pump speed does not adjust during physical activity so that cardiac output and exercise capacity remain markedly limited. It is the aim of this study to develop an automatic pump speed control based on filling pressure values in order to improve exercise capacity and quality of life in these patients. Different approaches are planned, to be tested in an in vitro patient simulator...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28508510/impaired-atrioventricular-transport-in-patients-with-transposition-of-the-great-arteries-palliated-by-atrial-switch-and-preserved-systolic-right-ventricular-function-a-magnetic-resonance-imaging-study
#3
Magalie Ladouceur, Nadjia Kachenoura, Gilles Soulat, Emilie Bollache, Alban Redheuil, Michel Azizi, Christophe Delclaux, Gilles Chatellier, Pierre Boutouyrie, Laurence Iserin, Damien Bonnet, Elie Mousseaux
OBJECTIVES: We aimed (1) determine if systemic right ventricle filling parameters influence systemic right ventricle stroke volume in adult patients with D-transposition of the great arteries (D-TGA) palliated by atrial switch, using cardiac magnetic resonance imaging and echocardiography, and (2) to study relationship of these diastolic parameters with exercise performance and BNP, in patients with preserved systolic systemic right ventricle function. DESIGN: Single-center, cross-sectional, prospective study...
May 16, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28507833/does-hemodynamic-guided-heart-failure-management-reduce-hospitalization-a-systematic-review
#4
REVIEW
Abdul M Minhas, Saba Ahmed, Muhammad S Khan, Kaneez Fatima, Muhammad N Anwar, Jonathan Constantin
Heart failure (HF) is a pressing health concern as the expense of hospitalization financially burdens the health care system. Hemodynamic monitoring has the potential to detect increases in intracardiac filling pressures weeks before clinical deterioration; hence, preliminary findings of volume overload with the use of these devices may prevent the progression of disease and lead to a reduction in HF-associated hospitalizations. We extensively searched PubMed, Ovid SP, Embase, and Cochrane databases to identify all the possible studies that assess the effect of hemodynamic monitoring on hospitalizations in HF patients...
April 13, 2017: Curēus
https://www.readbyqxmd.com/read/28501608/porosity-of-spacer-filled-channels-in-spiral-wound-membrane-systems-quantification-methods-and-impact-on-hydraulic-characterization
#5
A Siddiqui, S Lehmann, V Haaksman, J Ogier, C Schellenberg, M C M van Loosdrecht, J C Kruithof, J S Vrouwenvelder
The porosity of spacer-filled feed channels influences the hydrodynamics of spiral-wound membrane systems and impacts the overall performance of the system. Therefore, an exact measurement and a detailed understanding of the impact of the feed channel porosity is required to understand and improve the hydrodynamics of spiral-wound membrane systems applied for desalination and wastewater reuse. The objectives of this study were to assess the accuracy of porosity measurement techniques for feed spacers differing in geometry and thickness and the consequences of using an inaccurate method on hydrodynamic predictions, which may affect permeate production...
April 13, 2017: Water Research
https://www.readbyqxmd.com/read/28500597/blood-pressure-monitoring-using-radio-telemetry-method-in-mice
#6
Yu Wang, Sean E Thatcher, Lisa A Cassis
The TA11PA-C10 implantable transmitter (Data Sciences International, DSI) is designed to measure blood pressure (BP) and activity in freely moving laboratory mice. The fluid filled catheter is placed in the free flowing blood of the systemic artery (inserted into the left carotid artery and extended into the aorta), and the transmitter body is placed in a benign location for long-term biocompatibility. The transmitter can be used to monitor BP in mice (as small as 17 g) under normal physiological and unrestricted conditions 24 h a day while remaining free from stress associated with human interaction...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28500297/three-dimensional-quantitative-fracture-analysis-of-tight-gas-sandstones-using-industrial-computed-tomography
#7
Jin Lai, Guiwen Wang, Zhuoying Fan, Jing Chen, Ziqiang Qin, Chengwen Xiao, Shuchen Wang, Xuqiang Fan
Tight gas sandstone samples are imaged at high resolution industrial X-ray computed tomography (ICT) systems to provide a three-dimensional quantitative characterization of the fracture geometries. Fracture networks are quantitatively analyzed using a combination of 2-D slice analysis and 3-D visualization and counting. The core samples are firstly scanned to produce grayscale slices, and the corresponding fracture area, length, aperture and fracture porosity as well as fracture density were measured. Then the 2-D slices were stacked to create a complete 3-D image using volume-rendering software...
May 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28498676/intermolecular-interactions-in-highly-disordered-confined-dense-n2
#8
Mario Santoro, Federico A Gorelli, Roberto Bini, Julien Haines
Molecular nitrogen is a benchmark system for condensed matter and, in particular, for looking at universal properties of strongly confined dense systems. We conducted Raman and X-ray diffraction measurements on a dense and disordered form of molecular nitrogen subnanoconfined in a noncatalytic pure SiO2 zeolite under pressure, up to 50 GPa. In this form, N2-N2 interactions and, consequently, distances are found to be very close to those of bulk N2 and intramolecular interactions progressively weaken upon increasing pressure...
May 15, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28495226/a-gas-flow-model-for-layered-landfills-with-vertical-extraction-wells
#9
Shi-Jin Feng, Qi-Teng Zheng, Hai-Jian Xie
This paper developed a two-dimensional axisymmetric analytical model for layered landfills with vertical wells. The model uses a horizontal layered structure to describe the waste non-homogeneity with depth in gas generation, permeability and temperature. The governing equations in the cylindrical coordinate system were transformed to dimensionless forms and solved using a method of eigenfunction expansion. After verification, the effects of different well boundary conditions and gas extraction systems on recovery efficiency were investigated...
May 8, 2017: Waste Management
https://www.readbyqxmd.com/read/28482060/unsuccessfully-treated-hypertension-a-major-public-health-problem-with-a-potential-solution
#10
Curt D Furberg, Jean E Sealey, Jon D Blumenfeld
BACKGROUND: About one-half of all hypertensive adults do not have their blood pressure controlled. They are often prescribed medications that conform to national guidelines but they continue to have elevated blood pressure. This public health problem might be improved by applying plasma renin guided therapy. RESULTS: A contributor to the public health problem of unsuccessfully treated hypertension is that the circulating renin-angiotensin system (RAS) is not recognized in treatment guidelines as clinically relevant for the treatment of hypertension or as important as the body salt status for determining blood pressure levels...
May 8, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/28479464/embo-evar-a-technique-to-prevent-type-ii-endoleak-a-single-centre-experience
#11
Massimiliano Natrella, Federico Navarretta, Alessandro Rapellino, Gianluca Job, Massimo Cristoferi, Matteo Castagnola, Gianmarco Lunardi, Luca Duc, Gianluca Fanelli, Andrea Peruzzo Cornetto, Teodoro Meloni, Flavio Peinetti
OBJECTIVES: To evaluate the role of intraprocedural aneurysm sac embolisation (embo-EVAR) during endovascular abdominal aneurysm repair (EVAR) using coils and fibrin glue for preventing type II endoleak (EII). MATERIALS AND METHODS: A retrospective clinical case analysis of 72 patients who underwent EVAR during the period 2011-2014. Two groups were compared at 6 and 12 months follow-up with MDCT scan and Contrast-enhanced ultrasound (CEUS) imaging: consecutively, 36 patients (group A) treated with classic EVAR and 36 patients (group B) treated with embo-EVAR...
May 4, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28479354/lyophilization-cycle-design-for-dual-chamber-cartridges-and-a-method-for-online-process-control-the-dcc-lyomate-procedure
#12
Christoph Korpus, Wolfgang Frieß
Freeze-Drying process design is a challenging task that necessitates a profound understanding of the complex interrelation between critical process parameters (e.g. shelf temperature and chamber pressure), heat transfer characteristics of the involved materials (e.g. product containers and holder devices) and critical quality attributes of the product (e.g. collapse temperatures). The Dual Chamber Cartridge "(DCC) LyoMate" (from lyophilization and automated), is a manometric temperature measurement (MTM) -based process control strategy that was developed within this study to streamline this complicated task...
May 4, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28478943/feasibility-safety-and-tolerance-of-subcutaneous-synthetic-canine-b-type-natriuretic-peptide-syncbnp-in-healthy-dogs-and-dogs-with-stage-b1-mitral-valve-disease
#13
M A Oyama, P F Solter, C L Thorn, J A Stern
INTRODUCTION: An important aspect of heart failure is the progressive ineffectiveness of the salutary natriuretic peptide system and its secondary messenger, 3',5'-cyclic guanosine monophosphate (cGMP). In humans with acute heart failure, administration of exogenous natriuretic peptide is associated with improvement in clinical signs and reduction of cardiac filling pressures. This study aimed to determine the feasibility, tolerance, and safety of subcutaneous (SC) synthetic canine B-type natriuretic peptide (syncBNP) administration in dogs...
May 3, 2017: Journal of Veterinary Cardiology: the Official Journal of the European Society of Veterinary Cardiology
https://www.readbyqxmd.com/read/28473116/elevated-mitral-valve-pressure-gradient-after-mitraclip-implantation-deteriorates-long-term-outcome-in-patients-with-severe-mitral-regurgitation-and-severe%C3%A2-heart-failure
#14
Michael Neuss, Thomas Schau, Akihiro Isotani, Markus Pilz, Maren Schöpp, Christian Butter
OBJECTIVES: This single-center study was performed to analyze the effect of an increased transvalvular gradient after the MitraClip (MC) (Abbott Laboratories, Abbott Park, Illinois) procedure on patient outcome during follow-up. BACKGROUND: Percutaneous transcatheter repair of the mitral valve with the MC device has been established as a novel technique for patients with severe mitral regurgitation and high surgical risk. This study investigated the influence of an increased pressure gradient after MC implantation on the long-term outcome of patients...
May 8, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28441439/hemodynamics-and-gas-exchange-during-chest-compressions-in-neonatal-resuscitation
#15
Payam Vali, Praveen Chandrasekharan, Munmun Rawat, Sylvia Gugino, Carmon Koenigsknecht, Justin Helman, Bobby Mathew, Sara Berkelhamer, Jayasree Nair, Myra Wyckoff, Satyan Lakshminrusimha
PURPOSE: Current knowledge about pulmonary/systemic hemodynamics and gas exchange during neonatal resuscitation in a model of transitioning fetal circulation with fetal shunts and fluid-filled alveoli is limited. Using a fetal lamb asphyxia model, we sought to determine whether hemodynamic or gas-exchange parameters predicted successful return of spontaneous circulation (ROSC). METHODS: The umbilical cord was occluded in 22 lambs to induce asphyxial cardiac arrest...
2017: PloS One
https://www.readbyqxmd.com/read/28437221/the-effect-of-reinforcement-methods-with-knotted-and-knotless-sutures-comparison-of-burst-pressures
#16
Alper Yavuz, Hakan Buluş
Sleeve gastrectomy operations have become popular among restrictive obesity surgeons, due to its effectiveness for losing weight and acceptable complication rates. However, leakage is a significant problem in these operations. In this ex vivo study, we tried to understand mechanisms of leakage and to examine the effects of two different types of frequently referred reinforcement techniques using sutures. The resected gastric specimens that were removed during sleeve gastrectomy operations were used in this ex vivo study...
September 22, 2016: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/28420152/measurement-of-pressure-fluctuations-inside-a-model-thrust-bearing-using-pvdf-sensors
#17
Andrew Youssef, David Matthews, Andrew Guzzomi, Jie Pan
Thrust bearings play a vital role in propulsion systems. They rely on a thin layer of oil being trapped between rotating surfaces to produce a low friction interface. The "quality" of this bearing affects many things from noise transmission to the ultimate catastrophic failure of the bearing itself. As a result, the direct measure of the forces and vibrations within the oil filled interface would be very desirable and would give an indication of the condition of the bearing in situ. The thickness of the oil film is, however, very small and conventional vibration sensors are too cumbersome to use in this confined space...
April 16, 2017: Sensors
https://www.readbyqxmd.com/read/28398440/assembly-of-trivalent-particles-under-confinement-from-an-exotic-solid-phase-to-a-liquid-phase-at-low-temperature
#18
Eva G Noya, Noé G Almarza, Enrique Lomba
Using computer simulations, we study the phase diagram of a two-dimensional system of disk particles with three patches distributed symmetrically along the particle equator. The geometry of the particles is compatible with a honey-comb lattice at moderately low temperature and pressure, whereas it is expected that the system forms a close-packed triangular lattice at high temperature and pressure. The effect of patch size within the single bond per patch regime was investigated, and it was found that the topology of the phase diagram changes drastically with patch size...
May 3, 2017: Soft Matter
https://www.readbyqxmd.com/read/28396595/p2y6-deficiency-increases-micturition-frequency-and-attenuates-sustained-contractility-of-the-urinary-bladder-in-mice
#19
Satoru Kira, Mitsuharu Yoshiyama, Sachiko Tsuchiya, Eiji Shigetomi, Tatsuya Miyamoto, Hiroshi Nakagomi, Keisuke Shibata, Tsutomu Mochizuki, Masayuki Takeda, Schuichi Koizumi
The role of the P2Y6 receptor in bladder function has recently attracted a great deal of attention in lower urinary tract research. We conducted this study to determine contributions of the P2Y6 receptor in lower urinary tract function of normal phenotypes by comparing P2Y6-deficient mice and wild-type mice. In in vivo experiments, P2Y6-deficient mice had more frequent micturition with smaller bladder capacity compared to wild-type mice; however, there was no difference between these groups in bladder-filling pressure/volume relationships during cystometry under decerebrate, unanaesthetized conditions...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28393776/serial-semi-invasive-hemodynamic-assessment-following-pericardiectomy-for-chronic-constrictive-pericarditis
#20
Ujjwal Kumar Chowdhury, Poonam Malhotra Kapoor, Adil Rizvi, Vishwas Malik, Sandeep Seth, Rajiv Narang, Mani Kalaivani, Sarvesh Pal Singh, Sathiya Selvam
OBJECTIVES: This study was designed to prospectively investigate the effects of pericardiectomy via median sternotomy on intra- and postoperative hemodynamics by a new semi-invasive device (Flotrac/VigileoTM monitor) using arterial pressure waveform analysis. PATIENTS AND METHODS: Thirty consecutive patients aged 15 to 55 years (mean+SD, 31.73 + 13.53 years), who had undergone total pericardiectomy via median sternotomy underwent serial hemodynamic evaluation. FlotracTM Sensor - derived stroke volume, stroke volume variation, systemic vascular resistance index (SVRI), cardiac index and right atrial pressure were measured just before and after pericardiectomy, at 12 hours, 24 hours, 48 hours, 72 hours and at discharge postoperatively...
April 2017: Annals of Cardiac Anaesthesia
keyword
keyword
76925
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"