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https://www.readbyqxmd.com/read/28540815/computation-of-ultimate-sar-amplification-factors-for-radiofrequency-hyperthermia-in-non-uniform-body-models-impact-of-frequency-and-tumour-location
#1
Bastien Guérin, Jorge F Villena, Athanasios G Polimeridis, Elfar Adalsteinsson, Luca Daniel, Jacob K White, Bruce R Rosen, Lawrence L Wald
PURPOSE: We introduce a method for calculation of the ultimate specific absorption rate (SAR) amplification factors (uSAF) in non-uniform body models. The uSAF is the greatest possible SAF achievable by any hyperthermia (HT) phased array for a given frequency, body model and target heating volume. METHODS: First, we generate a basis-set of solutions to Maxwell's equations inside the body model. We place a large number of electric and magnetic dipoles around the body model and excite them with random amplitudes and phases...
May 11, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28522238/biomechanical-comparison-of-four-coupled-fixation-systems-for-acl-reconstruction-with-bone-socket-or-full-tunnel-on-the-tibial-side
#2
Edoardo Monaco, Mattia Fabbri, Riccardo Maria Lanzetti, Andrea Del Duca, Luca Labianca, Andrea Ferretti
BACKGROUND: To compare in an animal model the biomechanical properties of four coupled fixation devices currently used in ACL reconstruction. Three out of four devices used a full tibial tunnel with an interference screw, while the other one system used a tibial socket and an adjustable loop suspension device. The null hypothesis is that there are no biomechanical differences between all the techniques tested. METHODS: Thirty two femur-graft-tibia complexes were mounted on a tensile machine using bovine digital extensor tendons, porcine knees and four different fixation device combinations: After a preconditioning with a tensile load of 90N for five minutes, 1000cycles between 0 and 150N were applied to the complex before the final pulled to failure...
May 15, 2017: Knee
https://www.readbyqxmd.com/read/28521596/overcoming-the-current-issues-surrounding-device-leads-reducing-the-complications-during-extraction
#3
Maria Grazia Bongiorni, Luca Segreti, Andrea Di Cori, Giulio Zucchelli, Luca Paperini, Stefano Viani, Ezio Soldati
The implantation rate of of Cardiac implantable Elecrtonical Devices has consistently increased in the last 20 years, so as related complication rates. According, devices infections and malfunctions required the development of appropriate strategies. The most relevant issue is the removal of pacing and ICD leads, which, few months after implantation, tend to develop intravascular fibrosis, often making extraction a challenging and risky procedure. Areas Covered: TLE scenario is constantly evolving. Transvenous lead extraction (TLE) is a key procedure in lead management strategies...
May 18, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28520540/virtual-surgery-for-conduit-reconstruction-of-the-right-ventricular-outflow-tract
#4
Chin Siang Ong, Yue-Hin Loke, Justin Opfermann, Laura Olivieri, Luca Vricella, Axel Krieger, Narutoshi Hibino
PURPOSE: Virtual surgery involves the planning and simulation of surgical reconstruction using three-dimensional (3D) modeling based upon individual patient data, augmented by simulation of planned surgical alterations including implantation of devices or grafts. Here we describe a case in which virtual cardiac surgery aided us in determining the optimal conduit size to use for the reconstruction of the right ventricular outflow tract. DESCRIPTION: The patient is a young adolescent male with a history of tetralogy of Fallot with pulmonary atresia, requiring right ventricle-to-pulmonary artery (RV-PA) conduit replacement...
May 2017: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/28514263/ventricular-energetics-in-pediatric-left-ventricular-assist-device-patients-a-retrospective-clinical-study
#5
Arianna Di Molfetta, Gianfranco Ferrari, Roberta Iacobelli, Sergio Filippelli, Luca Di Chiara, Paolo Guccione, Antonio Amodeo
The aim of this study is to estimate the trend of right and left energetic parameters in left ventricular assist device (LVAD) pediatric patients. Echocardiographic data were retrospectively collected at the baseline, in the acute phase after and at the monthly follow-ups till the LVAD explantation to estimate left and right ventricular energetic parameters. A significant relationship between the left and right ventricular energetic parameter trends was found along all the study period. Left ventricular end-systolic pressure-volume relationship improved till the follow-up of 2 months and then progressively decreases...
May 16, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28512580/high-intensity-focused-ultrasound-circular-cyclocoagulation-in-glaucoma-a-step-forward-for-cyclodestruction
#6
REVIEW
Rodolfo Mastropasqua, Vincenzo Fasanella, Alessandra Mastropasqua, Marco Ciancaglini, Luca Agnifili
The ciliary body ablation is still considered as a last resort treatment to reduce the intraocular pressure (IOP) in uncontrolled glaucoma. Several ablation techniques have been proposed over the years, all presenting a high rate of complications, nonselectivity for the target organ, and unpredictable dose-effect relationship. These drawbacks limited the application of cyclodestructive procedures almost exclusively to refractory glaucoma. High-intensity focused ultrasound (HIFU), proposed in the early 1980s and later abandoned because of the complexity and side effects of the procedure, was recently reconsidered in a new approach to destroy the ciliary body...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28506978/addition-of-blood-pressure-and-weight-transmissions-to-standard-remote-monitoring-of-implantable-defibrillators-and-its-association-with-mortality-and-rehospitalization
#7
M Obadah Al-Chekakie, Haikun Bao, Paul W Jones, Kenneth M Stein, Lucas Marzec, Paul D Varosy, Frederick A Masoudi, Jeptha P Curtis, Joseph G Akar
BACKGROUND: Among patients with implantable defibrillators (ICD), use of remote patient monitoring (RPM) is associated with lower risk of death and rehospitalization. Standard ICD RPM can be supplemented with weight and blood pressure data. It is not known whether standard RPM plus routine weight and blood pressure transmission (RPM+) is associated with better outcomes. METHODS AND RESULTS: RPM+ patients (n=4106) were compared with patients who only transmitted standard ICD RPM data (n=14 183)...
May 2017: Circulation. Cardiovascular Quality and Outcomes
https://www.readbyqxmd.com/read/28504219/one-year-clinical-results-of-the-italian-diffuse-multivessel-disease-absorb-prospective-registry-it-disappears
#8
Luca Testa, Marco De Carlo, Alessandro Petrolini, Claudio Rapetto, Ferdinando Varbella, Bernardo Cortese, Gabriele Gabrielli, Salvatore Geraci, Bruno Loi, Giacomo Boccuzzi, Giuseppe Tarantini, Daniela Fischetti, Paolo Calabria, Fabrizio Tomai, Flavio Ribichini, Corrado Tamburino, Ciro Indolfi, Antonio L Bartorelli, Anna Sonia Petronio, Francesco Bedogni
AIMS: The present multicentre prospective study, IT-DISAPPEARS, was designed with the aim of evaluating early and long-term clinical outcomes of the Absorb BVS in patients with long coronary lesions and/or multivessel coronary artery disease. The aim of this article is to present the one-year clinical results of this study. METHODS AND RESULTS: Between November 2014 and January 2016, we enrolled 1,002 patients undergoing BVS implantation (long lesion [≥ 24 mm] of a single vessel in 80...
May 16, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28498725/evaluation-of-abbott-s-burstdr-stimulation-device-for-the-treatment-of-chronic-pain
#9
Timothy R Deer, Lucas W Campos, Jason E Pope
Burst stimulation, as described by DeRidder, is a novel waveform made up of closely spaced, high-frequency electrical impulses delivered in packets, which are followed by a quiescent period or interburst interval. Electrically generated burst waveforms were initially designed to treat neural pathology in the auditory cortex and were later applied to the spinal cord through spinal cord stimulation (SCS) devices to treat chronic pain states. When Burst stimulation is applied to the spinal cord, the impulses travel to the thalamus and then diverge, targeting both the somatosensory cortex and the limbic system where they treat both the sensory, affective and attentional components of neuropathic pain...
May 12, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28497937/cone-beam-volumetric-imaging-in-craniofacial-medicine
#10
Dario Bertossi, Pietro Fiorino, Claudia Corega, Luca Sbricoli, Daniele DE Santis, Dario Donadello, Giulia Ricciardi, Umberto Luciano, Eriberto Bressan, Alessia Pardo, Massimo Albanese, Alessandro Zangani
With the development of x-ray computed tomography (CT) in the 1960s and its first use for clinical studies in 1972 by Sir Godfrey Hounsfield, radiological tomography attained widespread use and today is one of the essential imaging techniques in medical radiology. It is a technically mature and clinically widely accepted method and complements classical x-ray panoramic radiography in many areas. The technology is frequently used in craniofacial radiology, because of its characteristic low radiation dose, high spatial resolution and lower cost compared with CT...
May 12, 2017: Minerva Stomatologica
https://www.readbyqxmd.com/read/28493877/co2-driven-endotracheal-tube-cuff-control-in-critically-ill-patients-a-randomized-controlled-study
#11
Gennaro De Pascale, Mariano Alberto Pennisi, Maria Sole Vallecoccia, Giuseppe Bello, Riccardo Maviglia, Luca Montini, Valentina Di Gravio, Salvatore Lucio Cutuli, Giorgio Conti, Massimo Antonelli
BACKGROUND: To determine the safety and clinical efficacy of an innovative integrated airway system (AnapnoGuard™ 100 system) that continuously monitors and controls the cuff pressure (Pcuff), while facilitating the aspiration of subglottic secretions (SS). METHODS: This was a prospective, single centre, open-label, randomized, controlled feasibility and safety trial. The primary endpoint of the study was the rate of device related adverse events (AE) and serious AE (SAE) as a result of using AnapnoGuard (AG) 100 during mechanical ventilation...
2017: PloS One
https://www.readbyqxmd.com/read/28492570/-the-use-of-mechanical-chest-compression-devices-for-both-out-of-hospital-and-in-hospital-refractory-cardiac-arrest
#12
Alessandra Russo, Nicola Gasparetto, Luca Favero, Salvatore Ivan Caico, Silvia Orazio, Guido Garzena, Paolo Rosi, Zoran Olivari
The purpose of cardiopulmonary resuscitation after sudden cardiac arrest is to restore minimal blood flow to provide oxygen to the brain and other vital organs. Chest compressions and external defibrillation are the first line for circulatory support. Although early defibrillation is the main factor influencing survival, cardiopulmonary resuscitation must be characterized by high-quality external chest compressions. Unfortunately, the performance of manual chest compressions decreases during time and in hostile conditions...
April 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/28492569/-electromagnetic-interference-in-the-current-era-of-cardiac-implantable-electronic-devices-designed-for-magnetic-resonance-environment
#13
Valentina Ribatti, Luca Santini, Giovanni B Forleo, Domenico Della Rocca, Germana Panattoni, Marta Scali, Valentina Schirripa, Nicola Danisi, Fabrizio Ammirati, Massimo Santini
In the last decades we are observing a continuous increase in the number of patients wearing cardiac implantable electronic devices (CIEDs). At the same time, we face daily with a domestic and public environment featured more and more by the presence and the utilization of new emitters and finally, more medical procedures are based on electromagnetic fields as well. Therefore, the topic of the interaction of devices with electromagnetic interference (EMI) is increasingly a real and actual problem.In the medical environment most attention is paid to magnetic resonance, nevertheless the risk of interaction is present also with ionizing radiation, electrical nerve stimulation and electrosurgery...
April 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/28490728/bright-nanoscale-source-of-deterministic-entangled-photon%C3%A2-pairs-violating-bell-s-inequality
#14
Klaus D Jöns, Lucas Schweickert, Marijn A M Versteegh, Dan Dalacu, Philip J Poole, Angelo Gulinatti, Andrea Giudice, Val Zwiller, Michael E Reimer
Global, secure quantum channels will require efficient distribution of entangled photons. Long distance, low-loss interconnects can only be realized using photons as quantum information carriers. However, a quantum light source combining both high qubit fidelity and on-demand bright emission has proven elusive. Here, we show a bright photonic nanostructure generating polarization-entangled photon pairs that strongly violates Bell's inequality. A highly symmetric InAsP quantum dot generating entangled photons is encapsulated in a tapered nanowire waveguide to ensure directional emission and efficient light extraction...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28487535/basic-protocols-in-quantum-reinforcement-learning-with-superconducting-circuits
#15
Lucas Lamata
Superconducting circuit technologies have recently achieved quantum protocols involving closed feedback loops. Quantum artificial intelligence and quantum machine learning are emerging fields inside quantum technologies which may enable quantum devices to acquire information from the outer world and improve themselves via a learning process. Here we propose the implementation of basic protocols in quantum reinforcement learning, with superconducting circuits employing feedback- loop control. We introduce diverse scenarios for proof-of-principle experiments with state-of-the-art superconducting circuit technologies and analyze their feasibility in presence of imperfections...
May 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28483617/a-steerable-sheath-to-deploy-hypogastric-bridging-stent-by-contralateral-femoral-approach-in-an-iliac-branch-procedure-after-evar
#16
Ciro Ferrer, Luigi Venturini, Raffaele Grande, Katia Raccagni, Luca Ginanni Corradini, Mario Corona, Luca di Marzo
Aneurysmal degeneration of distal landing zones after endovascular aneurysm repair (EVAR), can be a potential cause of late failure of this technique. Aneurysmal degeneration of common iliac arteries increases the risk of rupture of the iliac aneurysm itself as well as of the abdominal aortic aneurysm (AAA) owing to aneurysm's reperfusion as a type Ib endoleak. Reoperation consists in plugging and covering the internal iliac artery (IIA), by extension into the external iliac artery, or preservation of antegrade flow in IIA by iliac branch devices (IBD) or sandwich technique...
May 5, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28480698/role-of-nonradiative-defects-and-environmental-oxygen-on-exciton-recombination-processes-in-cspbbr3-perovskite-nanocrystals
#17
Monica Lorenzon, Luca Sortino, Quinten Akkerman, Sara Accornero, Jacopo Pedrini, Mirko Prato, Valerio Pinchetti, Francesco Meinardi, Liberato Manna, Sergio Brovelli
Lead halide perovskite nanocrystals (NCs) are emerging as optically active materials for solution-processed optoelectronic devices. Despite the technological relevance of tracing rational guidelines for optimizing their performances and stability beyond their intrinsic resilience to structural imperfections, no in-depth study of the role of selective carrier trapping and environmental conditions on their exciton dynamics has been reported to date. Here we conduct spectro-electrochemical (SEC) experiments, side-by-side to oxygen sensing measurements on CsPbBr3 NCs for the first time...
May 10, 2017: Nano Letters
https://www.readbyqxmd.com/read/28479470/third-vs-second-generation-stent-graft-for-endovascular-aneurysm-repair-a-device-specific-analysis
#18
Marco Bergonti, Giovanni Teruzzi, Giulia Santagostino, Luca Grancini, Cristina Ferrari, Daniela Trabattoni, Alessandro Lualdi, Antonio Bartorelli
PURPOSE: to analyze outcomes of Endovascular Aneurysm Repair (EVAR) in patients treated with Excluder endograft (W.L. Gore and Associate, Flagstaff, AZ), comparing 2(nd) generation featuring SIM-PULL delivery system (ExSP), and 3(rd) generation, featuring C3 (ExC3), concerning intra-procedural data and long-term outcomes. METHODS: In our single-center, comparative study, we retrospectively analyzed all patients undergoing elective EVAR with Excluder from May 2008 to December 2015...
May 4, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28479464/embo-evar-a-technique-to-prevent-type-ii-endoleak-a-single-centre-experience
#19
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/28476479/the-cost-effectiveness-of-a-mechanical-compression-device-in-out-of-hospital-cardiac-arrest
#20
Joachim Marti, Claire Hulme, Zenia Ferreira, Silviya Nikolova, Ranjit Lall, Charlotte Kaye, Michael Smyth, Charlotte Kelly, Tom Quinn, Simon Gates, Charles D Deakin, Gavin D Perkins
AIM: To assess the cost-effectiveness of LUCAS-2, a mechanical device for cardiopulmonary resuscitation (CPR) as compared to manual chest compressions in adults with non-traumatic, out-of-hospital cardiac arrest. METHODS: We analysed patient-level data from a large, pragmatic, multi-centre trial linked to administrative secondary care data from the Hospital Episode Statistics (HES) to measure healthcare resource use, costs and outcomes in both arms. A within-trial analysis using quality adjusted life years derived from the EQ-5D-3L was conducted at 12-month follow-up and results were extrapolated to the lifetime horizon using a decision-analytic model...
May 2, 2017: Resuscitation
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