keyword
MENU ▼
Read by QxMD icon Read
search

External valve

keyword
https://www.readbyqxmd.com/read/29221734/aortic-annulus-does-not-dilate-over-time-after-aortic-root-remodeling-with-or-without-annuloplasty
#1
Takashi Kunihara, Satoshi Arimura, Fumihiro Sata, Christian Giebels, Ulrich Schneider, Hans-Joachim Schäfers
OBJECTIVE: The lack of annular stabilization is the drawback of aortic root remodeling, and recently the addition of annuloplasty has been proposed. Limited data, however, exist on late annular size after remodeling. We studied annular size over time. METHODS: In 241 patients (53 ± 16 years) annular size was determined preoperatively (T0), before discharge (T1), and at least 2 years after remodeling (T2, 54 ± 27 months) with (n = 52) or without external suture annuloplasty...
December 5, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29216839/rates-of-morphological-evolution-asymmetry-and-morphological-integration-of-shell-shape-in-scallops
#2
Emma Sherratt, Jeanne M Serb, Dean C Adams
BACKGROUND: Rates of morphological evolution vary across different taxonomic groups, and this has been proposed as one of the main drivers for the great diversity of organisms on Earth. Of the extrinsic factors pertaining to this variation, ecological hypotheses feature prominently in observed differences in phenotypic evolutionary rates across lineages. But complex organisms are inherently modular, comprising distinct body parts that can be differentially affected by external selective pressures...
December 8, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/29184602/-giant-lithiasis-due-to-urinary-stasis-related-to-ileo-caecal-bladder
#3
Hamza Dergamoun, Zayd El Boukili El Makhoukhi
Bladder exstrophy is a malformation characterized by subumbilical anterior abdominal wall and anterior bladder wall deishence. It affects nearly 30.000-40.000 births per year, with a higher prevalence in boys. External continent urinary diversion creates a long-term outcome. However, it is not devoid of complications. We report the case of a 30-year old female patient who had undergone cystectomy with bladder replaced with ileo-caecal segment for bladder exstrophy 13 years earlier. She was followed up for 5 years and then lost to follow up...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/29162718/delay-between-actuation-and-shaking-of-a-hydrofluoroalkane-fluticasone-pressurized-metered-dose-inhaler
#4
Ariel Berlinski, Dirk von Hollen, John N Pritchard, Ross Hm Hatley
BACKGROUND: Inhaled corticosteroids are used to treat pediatric asthma. The shaking of a pressurized metered-dose inhaler (pMDI) is required to ensure consistency of emitted dose. Delays between shaking and actuating the pMDI are frequent during administration of aerosols to children where a valved holding chamber is used. METHODS: In a recent clinical trial, we used a monitoring device to record shaking and actuation of the pMDI and the inhalation profiles of children with asthma while they were inhaling fluticasone hydrofluoroalkane from a valved holding chamber onto an external filter...
November 21, 2017: Respiratory Care
https://www.readbyqxmd.com/read/29156355/biomechanical-evaluation-of-a-personalized-external-aortic-root-support-applied-in-the-ross-procedure
#5
Julie Vastmans, Heleen Fehervary, Peter Verbrugghe, Tom Verbelen, Emma Vanderveken, Jos Vander Sloten, Tom Treasure, Filip Rega, Nele Famaey
A commonly heard concern in the Ross procedure, where a diseased aortic valve is replaced by the patient's own pulmonary valve, is the possibility of pulmonary autograft dilatation. We performed a biomechanical investigation of the use of a personalized external aortic root support or exostent as a possibility for supporting the autograft. In ten sheep a short length of pulmonary artery was interposed in the descending aorta, serving as a simplified version of the Ross procedure. In seven of these cases, the autograft was supported by an external mesh or so-called exostent...
November 11, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29127116/predicting-mortality-after-transcatheter-aortic-valve-replacement-external-validation-of-the-transcatheter-valve-therapy-registry-model
#6
Thomas Pilgrim, Anna Franzone, Stefan Stortecky, Fabian Nietlispach, Alan G Haynes, David Tueller, Stefan Toggweiler, Oliver Muller, Enrico Ferrari, Stéphane Noble, Francesco Maisano, Raban Jeger, Marco Roffi, Jürg Grünenfelder, Christoph Huber, Peter Wenaweser, Stephan Windecker
BACKGROUND: The Transcatheter Valve Therapy (TVT) registry model was recently developed to predict the risk of in-hospital mortality in patients undergoing transcatheter aortic valve replacement. We sought to externally validate the model in an independent data set of consecutively enrolled patients in the Swiss Transcatheter Aortic Valve Implantation registry. METHODS AND RESULTS: The original prediction model was retrospectively applied to 3491 consecutive patients undergoing transcatheter aortic valve replacement in Switzerland between February 2011 and February 2016...
November 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29124391/implementing-a-digital-real-time-hydrocephalus-and-shunt-registry-to-evaluate-contemporary-pattern-of-care-and-surgical-outcome-in-pediatric-hydrocephalus
#7
Hans Christoph Bock, Maximilian Kanzler, Ulrich-Wilhelm Thomale, Hans Christoph Ludwig
OBJECTIVE: Treatment monitoring and outcome evaluation in pediatric hydrocephalus require gapless documentation regarding surgical and clinical follow-up data beginning from day 1 of treatment in order to apply high quality of care. Endoscopic procedures, shunt insertion and revision surgeries, and individual modifications of valve hardware or pressure settings during follow-up as well as established outcome measurements are highly relevant for complete illustration of the patient's hydrocephalus histories...
November 9, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29121572/simultaneous-determination-of-rutin-and-ascorbic-acid-in-a-sequential-injection-lab-at-valve-system
#8
Mohammed Khair E A Al-Shwaiyat, Yuliia V Miekh, Tatyana A Denisenko, Andriy B Vishnikin, Vasil Andruch, Yaroslav R Bazel
A green, simple, accurate and highly sensitive sequential injection lab-at-valve procedure has been developed for the simultaneous determination of ascorbic acid (Asc) and rutin using 18-molybdo-2-phosphate Wells-Dawson heteropoly anion (18-MPA). The method is based on the dependence of the reaction rate between 18-MPA and reducing agents on the solution pH. Only Asc is capable of interacting with 18-MPA at pH 4.7, while at pH 7.4 the reaction with both Asc and rutin proceeds simultaneously. In order to improve the precision and sensitivity of the analysis, to minimize reagent consumption and to remove the Schlieren effect, the manifold for the sequential injection analysis was supplemented with external reaction chamber, and the reaction mixture was segmented...
November 6, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29095145/electrical-controllable-spin-pump-based-on-a-zigzag-silicene-nanoribbon-junction
#9
Zhang Lin, Peiqing Tong
We propose a possible electrical controllable spin pump based on a zigzag silicene nanoribbon (ZSNR) ferromagnetic junction by applying two time-dependent perpendicular electric fields. By using the Keldysh Green's function method, we derive the analytic expression of spin-resolved current at adiabatic approximation and demonstrate that two asymmetric spin up and spin down currents can be pumped out in the device without an external bias. The pumped current mainly comes from the interplay between the photon-assisted spin pump effect and the electrically-modulated energy band structure of the tunneling junction...
November 2, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29054364/-indication-for-mitral-valve-interventions-development-of-a-quality-indicator-for-external-hospital-quality-assurance
#10
Christina Köster, Lena Schorbach, Stephanie Wrede, Sven Meyer, Tonia Kazmaier, Joachim Szecsenyi
BACKGROUND: The indication for a mitral valve intervention is an important patient-relevant parameter for the assessment of process quality and the comparison of healthcare providers. In this article, we describe the development of a corresponding quality indicator for an external hospital quality assurance (QA) procedure in Germany. METHODS: An expert panel was set up by the aQua Institute to assist with the development of a QA procedure for mitral valve interventions and the associated quality indicators...
October 17, 2017: Zeitschrift Für Evidenz, Fortbildung und Qualität Im Gesundheitswesen
https://www.readbyqxmd.com/read/29053300/proximity-effects-in-bilayer-graphene-on-monolayer-wse_-2-field-effect-spin-valley-locking-spin-orbit-valve-and-spin-transistor
#11
Martin Gmitra, Jaroslav Fabian
Proximity orbital and spin-orbit effects of bilayer graphene on monolayer WSe_{2} are investigated from first principles. We find that the built-in electric field induces an orbital band gap of about 10 meV in bilayer graphene. Remarkably, the proximity spin-orbit splitting for holes is 2 orders of magnitude-the spin-orbit splitting of the valence band at K is about 2 meV-more than for electrons. Effectively, holes experience spin valley locking due to the strong proximity of the lower graphene layer to WSe_{2}...
October 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29051929/fully-chip-embedded-automation-of-a-multi-step-lab-on-a-chip-process-using-a-modularized-timer-circuit
#12
Junsu Kang, Donghyeon Lee, Young Jin Heo, Wan Kyun Chung
For highly-integrated microfluidic systems, an actuation system is necessary to control the flow; however, the bulk of actuation devices including pumps or valves has impeded the broad application of integrated microfluidic systems. Here, we suggest a microfluidic process control method based on built-in microfluidic circuits. The circuit is composed of a fluidic timer circuit and a pneumatic logic circuit. The fluidic timer circuit is a serial connection of modularized timer units, which sequentially pass high pressure to the pneumatic logic circuit...
November 7, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/29023775/prenatal-sonographic-monitoring-of-progressive-cardiac-damages-caused-by-anti-ro-antibodies-a-case-report
#13
Fuanglada Tongprasert, Rekwan Sittiwangkul, Thitikarn Lerthiranwong, Theera Tongsong
Maternal autoantibodies to Ro/SSA are often linked to congenital heart block and rarely associated with structural defects. We describe the case of a fetus with anti-Ro-mediated second-degree block at 19 weeks, which progressed to a complete block, fibroelastosis, atrioventricular valve insufficiency, and semilunar valve stenosis/insufficiency at 20, 22, 24, and 26 weeks, respectively, although the fetus received transplacental anti-arrhythmic drugs. The 2150-g fetus was vaginally delivered at 35 weeks. An external pacemaker was inserted immediately after birth and replaced with permanent pacemaker at the age of 3 months...
October 12, 2017: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/29020413/incidence-predictors-and-clinical-outcomes-of-coronary-obstruction-following-transcatheter-aortic-valve-replacement-for-degenerative-bioprosthetic-surgical-valves-insights-from-the-vivid-registry
#14
Henrique B Ribeiro, Josep Rodés-Cabau, Philipp Blanke, Jonathon Leipsic, Jong Kwan Park, Vinayak Bapat, Raj Makkar, Matheus Simonato, Marco Barbanti, Joachim Schofer, Sabine Bleiziffer, Azeem Latib, David Hildick-Smith, Patrizia Presbitero, Stephan Windecker, Massimo Napodano, Alfredo G Cerillo, Mohamed Abdel-Wahab, Didier Tchetche, Claudia Fiorina, Jan-Malte Sinning, Mauricio G Cohen, Mayra E Guerrero, Brian Whisenant, Fabian Nietlispach, José Honório Palma, Luis Nombela-Franco, Arend de Weger, Malek Kass, Fabio Sandoli de Brito, Pedro A Lemos, Ran Kornowski, John Webb, Danny Dvir
Aims: There are limited data on coronary obstruction following transcatheter valve-in-valve (ViV) implantation inside failed aortic bioprostheses. The objectives of this study were to determine the incidence, predictors, and clinical outcomes of coronary obstruction in transcatheter ViV procedures. Methods and results: A total of 1612 aortic procedures from the Valve-in-Valve International Data (VIVID) Registry were evaluated. Data were subject to centralized blinded corelab computed tomography (CT) analysis in a subset of patients...
August 14, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28968314/reconstruction-of-an-alar-defect-with-a-fusiform-nasolabial-turnover-flap-with-a-proximal-superiorly-tapered-apex
#15
Constantin El Habr, Gian Vinelli, Adam Tinklepaugh, David Ciocon
The nasolabial turnover flap was first described by Spear et al in 1987 for the coverage of full thickness defects of the lateral ala. It offered a single-stage repair that recreated the internal nasal lining, the external nasal valve, and the rounded contour of the ala without requiring a cartilage graft. A frequently encountered problem with the execution of Spear's original design is elevation of the ipsilateral commissure of the adjacent lip due to its broad proximal pedicle. Here, the authors describe a fusiform-type design with a proximal, superiorly tapered apex that relies on anteriorly coursing perforators from the underlying angular artery...
September 29, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28960218/3d-shape-evolution-of-microparticles-and-3d-enabled-applications-using-non-uniform-uv-flow-lithography-nufl
#16
Kenneth Choi, Mohammad Salehizadeh, Rafael Belo Da Silva, Navid Hakimi, Eric Diller, Dae Kun Hwang
The generation of microparticles with non-spherical morphologies has generated extensive interest because of their enhanced physical properties that can increase their performance in a wide variety of clinical and industrial applications. A flow lithographic technique based on stop flow lithography (SFL) recently showed the ability to fabricate particles with 3D shapes via manipulation of the UV intensity profile in a simple 2D microfluidic channel. Here, we further explore this flow lithographic method, called non-uniform flow lithography (NUFL), to investigate the 3D-shape tuning ability for the generation of 3D magnetic microparticles and their potential applications...
October 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/28960050/redo-root-replacement-using-the-ross-in-valsalva-technique
#17
Shakil Farid, Saadallah Tamer, Laurent de Kerchove, Gebrine El Khoury
The Ross procedure is an alternative option for young and middle-aged patients needing aortic valve replacement. We present an interesting case where the patient had a preexisting aortic homograft that was implanted because of previous infective endocarditis with aortic root abscess. The patient presented with biological degeneration of the homograft with resultant severe stenosis as well as insufficiency. We performed a redo root surgery to replace the homograft with the Ross procedure by using the autograft inclusion into a vascular graft technique...
August 4, 2017: Multimedia Manual of Cardiothoracic Surgery: MMCTS
https://www.readbyqxmd.com/read/28941480/a-double-crossover-technique-in-an-obese-patient-undergoing-transfemoral-transcatheter-aortic-valve-implantation-how-to-accomplish-hemostasis-percutaneously
#18
Hirokazu Onishi, Toru Naganuma, Sunao Nakamura
Percutaneous transfemoral transcatheter aortic valve implantation (TF-TAVI) is generally an acceptable procedure but may be associated with vascular complications at femoral access sites, particularly in obese patients. This report aimed to describe a case of successful performance of our "double crossover technique" in an obese patient undergoing TF-TAVI with a percutaneous transfemoral intra-aortic balloon pump (TF-IABP). A 75-year-old man presented with heart failure due to a left ventricular ejection fraction of 35% and low-flow, low-gradient severe aortic stenosis...
September 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28935890/demonstration-and-analysis-of-the-suction-effect-for-pumping-lymph-from-tissue-beds-at-subatmospheric-pressure
#19
Samira Jamalian, Mohammad Jafarnejad, Scott D Zawieja, Christopher D Bertram, Anatoliy A Gashev, David C Zawieja, Michael J Davis, James E Moore
Many tissues exhibit subatmospheric interstitial pressures under normal physiologic conditions. The mechanisms by which the lymphatic system extracts fluid from these tissues against the overall pressure gradient are unknown. We address this important physiologic issue by combining experimental measurements of contractile function and pressure generation with a previously validated mathematical model. We provide definitive evidence for the existence of 'suction pressure' in collecting lymphatic vessels, which manifests as a transient drop in pressure downstream of the inlet valve following contraction...
September 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28933244/ventricular-fibrillation-and-myocardial-depression-following-pulmonary-valve-replacement-in-tetralogy-of-fallot-with-an-intramural-coronary-artery-and-coronary-artery-compression-by-chest-tube
#20
Mubbasheer Ahmed, Nathan E Thompson, Susan R Foerster, Michele A Frommelt, Michael E Mitchell, John P Scott
We describe the case of a 10-year-old male with a history of repaired Tetralogy of Fallot and known intramural right coronary artery (RCA) who presented for bioprosthetic pulmonary valve replacement. The operation was complicated by postoperative ventricular fibrillation arrest. Selective coronary angiography revealed external compression of the mid-RCA by a mediastinal chest tube that improved immediately upon removal of the tube. Ultimately, the patient required additional unroofing of the intramural coronary for full recovery...
January 1, 2017: World Journal for Pediatric & Congenital Heart Surgery
keyword
keyword
104773
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"