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https://www.readbyqxmd.com/read/28236098/use-of-extracorporeal-membrane-oxygenation-in-complicated-transcatheter-aortic-valve-replacement
#1
Kyokun Uehara, Kenji Minakata, Naritatsu Saito, Masao Imai, Hiroki Daijo, Taro Nakatsu, Kazuhisa Sakamoto, Kazuhiro Yamazaki, Takeshi Kimura, Ryuzo Sakata
OBJECTIVES: Although transcatheter aortic valve replacement (TAVR) is an excellent alternative procedure for high-risk patients with severe symptomatic aortic stenosis, it is often associated with life-threatening complications. We report on the emergency or elective use of veno-arterial extracorporeal membrane oxygenation (ECMO) to manage these complications. METHODS: Between December 2013 and February 2016, 46 patients underwent TAVR at our institution. Of these, 4 patients required emergency ECMO support and another 3 patients were electively placed on ECMO support at the start of the procedure...
February 24, 2017: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28230600/nasal-valve-collapse-our-treatment-protocol
#2
Giulia Amodeo, Domenico Scopelliti
The nasal valve area is the functional area that allows airflow regulation. It could be divided in an internal area and an external one, basing on the anatomical landmarks. Many conditions can damage these areas with a consequently nasal obstruction, more often in particular extended rhinoplasty and sequels of facial trauma. To restore this area many techniques were advocated during the last decades.In this article the authors investigate on valve areas deficiency in sequel of rhinoplasty proposing a structural approach through alar batten grafts to correct internal-external nasal valves collapse...
February 22, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28226685/tracking-of-the-anterior-mitral-leaflet-in-echocardiographic-sequences-using-active-contours
#3
Malik Saad Sultan, Nelson Martins, Diana Veiga, Manuel Joao Ferreira, Miguel Tavares Coimbra, Malik Saad Sultan, Nelson Martins, Diana Veiga, Manuel Joao Ferreira, Miguel Tavares Coimbra, Diana Veiga, Nelson Martins, Malik Saad Sultan, Miguel Tavares Coimbra, Manuel Joao Ferreira
Echocardiography assessment of cardiac valves plays a vital role in the diagnosis of rheumatic heart disease. In the vast majority of cases, the mitral valve gets affected, leading to the thickening of its leaflets that may result in the fusion of their tips. This changes the appearance and reduces the mobility of the leaflets, which also reduce the heart efficiency. Quantifying such parameters provides diagnostic insight. To achieve that, the first step is to identify and then track fast moving leaflets. This work is focused on Anterior Mitral Leaflet (AML) tracking...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28219192/-efficacy-comparison-of-interventional-treatment-by-anterograde-or-retrograde-catheterization-for-acute-lower-extremity-deep-venous-thrombosis
#4
G P Chen, J P Gu, X He, W S Lou, Y Wang, L Chen, H B Su, W Y Shi, T Wang
Objective: To compare the clinical efficacy differences between anterograde and retrograde catheterization interventional treatment for acute low extremity deep venous thrombosis(DVT). Methods: The clinical data of 217 patients with acute low extremity DVT between January 2009 and December 2014 were analyzed retrospectively. Group A: 67 patients underwent treated with anterograde catheterization interventional treatment. Group B: 150 patients underwent treated with retrograde catheterization interventional treatment...
February 7, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28187973/remodeling-root-repair-with-an-external-aortic-ring-annuloplasty
#5
Emmanuel Lansac, Isabelle Di Centa, Ghassan Sleilaty, Stephanie Lejeune, Alain Berrebi, Pavel Zacek, Mathieu Debauchez
OBJECTIVE: Although the remodeling technique provides the most dynamic valve-sparing root replacement, a dilated annulus (>25 mm) is a risk factor for failure. Aortic annuloplasty aims to reduce the annulus diameter, thus increasing coaptation height to protect the repair. The results of 177 patients with remodeling and external aortic ring annuloplasty were studied. METHODS: Data were collected from the Aortic Valve repair InternATiOnal Registry. Preoperative aortic insufficiency grade 3 or greater was present in 79 patients (44...
January 11, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28181607/robust-temperature-change-rate-actuated-valving-and-switching-for-highly-integrated-centrifugal-microfluidics
#6
M Keller, G Czilwik, J Schott, I Schwarz, K Dormanns, F von Stetten, R Zengerle, N Paust
We present new unit operations for valving and switching in centrifugal microfluidics that are actuated by a temperature change rate (TCR) and controlled by the rotational frequency. Implementation is realized simply by introducing a comparatively large fluidic resistance to an air vent of a fluidic structure downstream of a siphon channel. During temperature decrease at a given TCR, the air pressure inside the downstream structure decreases and the fluidic resistance of the air vent slows down air pressure compensation allowing a thermally induced underpressure to build up temporarily...
February 9, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28179104/variations-in-structure-of-the-outflow-tract-of-the-human-embryonic-heart-a-new-hypothesis-for-generating-bicuspid-aortic-semilunar-valves
#7
Nadine C Milos, Derek B Nordstrom, Ivano Ongaro, Ava K Chow
Outflow tract development of the heart is complex. The presence, differential growth and interactions of the various tissues through space and time contribute to the final development of the tract. This paper presents a novel interpretation of observations of outflow tract development, in particular of the aortic and pulmonary semilunar valves in embryos from the Shaner Collection at the University of Alberta. Three-dimensional reconstructions assist in the visualization of the spatial relationships of the developing valve tissues...
February 4, 2017: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/28167498/myocardial-oxygen-consumption-and-efficiency-in-aortic-valve-stenosis-patients-with-and-without-heart-failure
#8
Nils Henrik Stubkjær Hansson, Jens Sörensen, Hendrik Johannes Harms, Won Yong Kim, Roni Nielsen, Lars P Tolbod, Jørgen Frøkiær, Kirsten Bouchelouche, Karen Kaae Dodt, Inger Sihm, Steen Hvitfeldt Poulsen, Henrik Wiggers
BACKGROUND: Myocardial oxygen consumption (MVO2) and its coupling to contractile work are fundamentals of cardiac function and may be involved causally in the transition from compensated left ventricular hypertrophy to failure. Nevertheless, these processes have not been studied previously in patients with aortic valve stenosis (AS). METHODS AND RESULTS: Participants underwent (11)C-acetate positron emission tomography, cardiovascular magnetic resonance, and echocardiography to measure MVO2 and myocardial external efficiency (MEE) defined as the ratio of left ventricular stroke work and the energy equivalent of MVO2...
February 6, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28164025/pulmonary-autograft-in-aortic-position-is-everything-known
#9
COMMENT
Francesco Nappi, Antonio Nenna, Cristiano Spadaccio, Massimo Chello
The Ross operation provides several advantages compared to other valve substitutes to manage aortic valve disease, such as growth potential, excellent hemodynamics, freedom from oral anticoagulation and hemolysis, and better durability. However, progressive dilatation of the pulmonary autografts after Ross operation reflects the inadequate remodeling of the native pulmonary root in the systemic circulation, which results in impaired adaptability to systemic pressure and risk of reoperation after the first decade...
January 2017: Translational pediatrics
https://www.readbyqxmd.com/read/28153693/breathing-parameters-associated-to-two-different-external-nasal-dilator-strips-in-endurance-athletes
#10
Giancarlo Ottaviano, Andrea Ermolao, Ennio Nardello, Flavio Muci, Vittorio Favero, Marco Zaccaria, Lorenzo Favero
OBJECTIVE: The aim of the study was to investigate and compare the effects of two different external nasal dilator strips (ENDS) on nasal respiratory flow, maximal oxygen uptake (VO2max), nasal VO2max, time to exhaustion and subjective nasal obstruction in adult triathletes participating in exhaustive, controlled physical exercise tests. METHODS: Thirteen healthy triathletes without nasal symptoms were recruited and randomly tested in three different conditions: without ENDS, wearing the Breathe Right(®) dilator strip and wearing the Master-aid Roll-flex(®) strip...
January 30, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/28134644/management-of-rhinophyma-outcomes-study-of-the-subunit-method
#11
Aladdin H Hassanein, Raj M Vyas, Jessica Erdmann-Sager, Edward J Caterson, Julian J Pribaz
BACKGROUND: Rhinophyma causes a nasal deformity and functional airway obstruction. Partial excision (eg, tangential) with secondary healing commonly removes hypertrophic soft tissues but does not improve nasal support. The subunit method for rhinophyma uses 6 nasal flaps to provide exposure for removal of rhinophymatous tissue and enhance structure. The purpose of this study was to evaluate outcomes of subunit method. METHODS: Medical records of patients with rhinophyma treated with the subunit method between 2013 and 2016 were analyzed...
January 27, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28129320/totally-endoscopic-robotic-left-atrial-appendage-closure-demonstrates-high-success-rate
#12
Alison F Ward, Robert M Applebaum, Nana Toyoda, Ans Fakiha, Peter J Neuburger, Jennie Ngai, Robert G Nampiaparampil, David W Yaffee, Didier F Loulmet, Eugene A Grossi
OBJECTIVE: In patients with atrial fibrillation, 90% of embolic strokes originate from the left atrial appendage (LAA). Successful exclusion of the LAA is associated with a lower stroke rate in patients with atrial fibrillation. Surgical oversewing of the LAA is often incomplete when evaluated with transesophageal echocardiogram (TEE). External closure techniques of suturing and stapling have also demonstrated high failure rates with persistent flow and large stumps. We hypothesized that the precise visualization of a robotic LAA closure (RLAAC) would result in superior closure rates...
January 2017: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
https://www.readbyqxmd.com/read/28125664/velcro-like-system-used-to-fix-a-protective-faecal-shield-on-weevil-larvae
#13
Jiří Skuhrovec, Robert Stejskal, Filip Trnka, Andrea di Giulio
The last instar larva and pupa of Eucoeliodes mirabilis (A. Villa & G. B. Villa, 1835) (Curculionidae: Ceutorhynchini) are described using drawings and SEM images and are compared and keyed with already described larvae of 58 other ceutorhynchinae taxa. The larval body has an effective combination of morphological adaptations that assist a unique biological defensive strategy. All larval stages of E. mirabilis feed ectophytically on leaves of Euonymus europaeus L. (Celastraceae), and the larval body is covered with a thick faecal shield...
2017: PloS One
https://www.readbyqxmd.com/read/28105847/compact-ultrahigh-pressure-nanoflow-capillary-liquid-chromatograph
#14
Xiaofeng Zhao, Xiaofeng Xie, Sonika Sharma, Luke T Tolley, Alex Plistil, Hal E Barnett, Martin P Brisbin, Adam C Swensen, John C Price, Paul B Farnsworth, H Dennis Tolley, Stanley D Stearns, Milton L Lee
A compact ultrahigh-pressure nanoflow liquid chromatograph (LC) was developed with the purpose in mind of creating a portable system that could be easily moved to various testing locations or placed in close proximity to other instruments for optimal coupling, such as with mass spectrometry (MS). The system utilized innovative nanoflow pumps integrated with a very low volume stop-flow injector and mixing tee. The system weighed only 5.9 kg (13 lbs) or 4.5 kg (10 lbs) without a controller and could hold up to 1100 bar (16000 psi) of pressure...
January 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28104190/in%C3%A2-vitro-coronary-flow-after-transcatheter-aortic-valve-in-valve-implantation-a-comparison-of-2-valves
#15
Sina Stock, Michael Scharfschwerdt, Roza Meyer-Saraei, Doreen Richardt, Efstratios I Charitos, Hans-Hinrich Sievers, Thorsten Hanke
BACKGROUND: Transcatheter aortic valve-in-valve implantation (TAVI-ViV) is an evolving treatment strategy for degenerated surgical aortic valve bioprostheses (SAVBs). However, there is some concern regarding coronary obstruction, especially after TAVI-ViV in calcified SAVBs with externally mounted leaflets. We investigated in vitro coronary flow and hydrodynamics after TAVI-ViV using 2 modern SAVBs with externally and internally mounted leaflets. METHODS: Aortic root models including known risk factors for coronary obstruction served for the implantation of SAVBs with either externally mounted leaflets (St Jude Trifecta, size 25) or internally mounted leaflets (Edwards Perimount Magna Ease, size 25)...
February 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28092382/a-vascularized-and-perfused-organ-on-a-chip-platform-for-large-scale-drug-screening-applications
#16
Duc T T Phan, Xiaolin Wang, Brianna M Craver, Agua Sobrino, Da Zhao, Jerry C Chen, Lilian Y N Lee, Steven C George, Abraham P Lee, Christopher C W Hughes
There is a growing awareness that complex 3-dimensional (3D) organs are not well represented by monolayers of a single cell type - the standard format for many drug screens. To address this deficiency, and with the goal of improving screens so that drugs with good efficacy and low toxicity can be identified, microphysiological systems (MPS) are being developed that better capture the complexity of in vivo physiology. We have previously described an organ-on-a-chip platform that incorporates perfused microvessels, such that survival of the surrounding tissue is entirely dependent on delivery of nutrients through the vessels...
January 31, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28033641/optimizing-the-soft-tissue-triangle-alar-margin-furrow-and-alar-ridge-aesthetics-analysis-and-use-of-the-articulate-alar-rim-graft
#17
Jennifer L Goodrich, B J F Wong
The alar lobule, alar margin, and soft triangle facet are receiving more attention in the literature as critical elements to address both preoperatively and during rhinoplasty. We have found that the use of the articulated alar rim graft (AARG) corrects deficiencies in these areas as well as provides mechanical stability to the external valve. In this article, we describe indications for AARG, describe in detail the procedure for AARG placement, and highlight the transformation AARGs can achieve in two illustrated case studies...
December 2016: Facial Plastic Surgery: FPS
https://www.readbyqxmd.com/read/28009195/nanoelectromechanical-heat-engine-based-on-electron-electron-interaction
#18
A Vikström, A M Eriksson, S I Kulinich, L Y Gorelik
We theoretically show that a nanoelectromechanical system can be mechanically actuated by a heat flow through it via an electron-electron interaction. In contrast to most known actuation mechanisms in similar systems, this new mechanism does not involve an electronic current nor external ac fields. Instead, the mechanism relies on deflection-dependent tunneling rates and a heat flow which is mediated by an electron-electron interaction while an electronic current through the device is prohibited by, for instance, a spin-valve effect...
December 9, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/28005655/columellar-reconstruction-after-nasal-continuous-positive-airway-pressure-associated-necrosis
#19
Jerry W Chao, Janani A Raveendran, Tina M Sauerhammer, Gary F Rogers, Albert K Oh, Michael Boyajian
Though a life-saving modality in neonatal intensive care units, nasal continuous positive airway pressure (nCPAP) carries a small risk of irreversible ischemia and necrosis of the columella due to the configuration of the pressure delivery system. Iatrogenic injuries to the columella after nCPAP use result in a spectrum of disfigurement and functional airway obstruction. The authors performed a retrospective review of patients evaluated for nCPAP-related columellar deformities by the Division of Plastic and Reconstructive Surgery at the authors' institution over a 10-year period to assess reconstructive outcomes...
December 21, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28001132/geometrical-control-of-pure-spin-current-induced-domain-wall-depinning
#20
A Pfeiffer, R M Reeve, M Voto, W Savero-Torres, N Richter, L Vila, J P Attané, L Lopez-Diaz, Mathias Kläui
We investigate the pure spin-current assisted depinning of magnetic domain walls in half ring based Py/Al lateral spin valve structures. Our optimized geometry incorporating a patterned notch in the detector electrode, directly below the Al spin conduit, provides a tailored pinning potential for a transverse domain wall and allows for a precise control over the magnetization configuration and as a result the domain wall pinning. Due to the patterned notch, we are able to study the depinning field as a function of the applied external field for certain applied current densities and observe a clear asymmetry for the two opposite field directions...
March 1, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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