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https://www.readbyqxmd.com/read/28267527/the-underdilation-of-nitinol-stents-at-tips-implantation-solution-or-illusion
#1
Ashkan Mollaiyan, Dominik Bettinger, Martin Rössle
PURPOSE: This study investigates the behaviour of self-expanding nitinol stents at the time of TIPS-implantation and thereafter. METHODS: Hundred consecutive patients with cirrhosis receiving a TIPS revision were included. The smallest stent diameter was measured radiologically immediately after implantation and before shunt revision. Accuracy of the measurement was assessed by comparing the nominal stent diameter with the largest stent diameter measured at the time of revision...
April 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28254383/impact-of-stent-diameter-on-vascular-response-after-self-expanding-paclitaxel-eluting-stent-implantation-in-the-superficial-femoral-artery
#2
Kojiro Miki, Kenichi Fujii, Masahiko Shibuya, Masashi Fukunaga, Takahiro Imanaka, Kenji Kawai, Hiroto Tamaru, Akinori Sumiyoshi, Machiko Nishimura, Tetsuo Horimatsu, Ten Saita, Nagataka Yoshihara, Takumi Kimura, Yasuhiro Honda, Peter J Fitzgerald, Tohru Masuyama, Masaharu Ishihara
BACKGROUND: The optimal sizing of self-expanding paclitaxel-eluting stents (PES) in the treatment for superficial femoral artery (SFA) lesions is unclear. This study sought to investigate the influence of PES diameter on stent patency in SFA lesions using optical frequency domain imaging (OFDI). METHODS: A total of 20 de novo SFA lesions were randomized 1:1 to receive either self-expanding PES with a nominal diameter of 6mm or 8mm. Follow-up angiography and OFDI was scheduled six months after stent implantation, and volumetric OFDI analysis was performed to evaluate vascular response to the stents...
February 18, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28113292/non-invasive-personalisation-of-a-cardiac-electrophysiology-model-from-body-surface-potential-mapping
#3
Sophie Giffard-Roisin, Thomas Jackson, Lauren Fovargue, Jack Lee, Herve Delingette, Reza Razavi, Nicholas Ayache, Maxime Sermesant
Modelling cardiac electrophysiology (EP) can help understand pathologies and predict the response to therapies. Moreover, estimating patient-specific parameters of the EP model is crucial to obtain personalised information. The novelty of this paper is to use non-invasive data (body surface potential mapping, BSPM) in order to personalise the main parameters of a cardiac EP model for predicting different pacing conditions. First, an efficient forward model is proposed, coupling the Mitchell- Schaeffer transmembrane potential model with a current dipole formulation...
November 16, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28081481/fatigue-limits-of-different-peek-materials-for-dental-implants
#4
Andreas Dominik Schwitalla, Tycho Zimmermann, Tobias Spintig, Ilona Kallage, Wolf-Dieter Müller
The increasing use of PEEK (poly-ether-ether-ketone) as a substitute for metal implant components has led to the suggestion that it could also be used as an alternative to titanium in the field of dental implants. A major requirement for dental implant materials is their resistance to cyclic loading due to mastication. A special fatigue test was designed to evaluate the elastic behavior and long-term form stability of cylindrically shaped PEEK specimens of 4, 5 and 6mm in diameter, using 11 different PEEK materials of various grades: unfilled, filled with titanium dioxide or barium sulfate powder, reinforced with short carbon fibers or short glass fibers, and reinforced with continuous carbon fibers...
December 23, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28073660/effectiveness-of-subcutaneous-implantable-cardioverter-defibrillator-testing-in-patients-with-hypertrophic-cardiomyopathy
#5
Niccoló Maurizi, Ilaria Tanini, Iacopo Olivotto, Ernesto Amendola, Giuseppe Limongelli, Maria Angela Losi, Giuseppe Allocca, Giovanni Battista Perego, Paolo Pieragnoli, Giuseppe Ricciardi, Paolo De Filippo, Paola Ferrari, Giovanni Quarta, Stefano Viani, Antonio Rapacciuolo, Maria Grazia Bongiorni, Franco Cecchi
BACKGROUND: Subcutaneous ICD (S-ICD) is a promising option for Hypertrophic Cardiomyopathy (HCM) patients at risk of Sudden Cardiac Death (SCD). However, its effectiveness in terminating ventricular arrhythmias in HCM is yet unresolved. METHODS: Consecutive HCM patients referred for S-ICD implantation were prospectively enrolled. Patients underwent one or two attempts of VF induction by the programmer. Successful conversion was defined as any 65J shock that terminated VF (not requiring rescue shocks)...
March 15, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28048900/su-f-t-43-prediction-of-dose-increments-by-brain-metastases-resection-cavity-shrinkage-model-with-i-125-and-cs-131-ldr-seed-implantations
#6
D Han, S Braunstein, P Sneed, M McDermott, L Ma
PURPOSE: This work aims to determine dose variability via a brain metastases resection cavity shrinkage model (RC-SM) with I-125 or Cs-131 LDR seed implantations. METHODS: The RC-SM was developed to represent sequential volume changes of 95 consecutive brain metastases patients. All patients underwent serial surveillance MR and change in cavity volume was recorded for each patient. For the initial resection cavity, a prolate-ellipsoid cavity model was suggested and applied volume shrinkage rates to correspond to 1...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047630/su-f-t-526-a-comparative-study-on-gating-efficiency-of-varian-rpm-device-and-calypso-system
#7
P Ravindran, W WuiAnn, Y Lim
PURPOSE: In general, the linear accelerator is gated using respiratory signal obtained by way of external sensors to account for the breathing motion during radiotherapy. One of the commonly used gating devices is the Varian RPM device. Calypso system that uses electromagnetic tracking of implanted or surface transponders could also be used for gating. The aim of this study is to compare the gating efficiency of RPM device and the calypso system by phantom studies. METHODS: An ArcCheck insert was used as the phantom with a Gafchromic film placed in its holder...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046406/we-ab-bra-12-post-implant-dosimetry-in-prostate-brachytherapy-by-x-ray-and-mri-fusion
#8
S Park, Y Le, D Song, J Lee
PURPOSE: For post-implant dosimetric assessment after prostate brachytherapy, CT-MR fusion approach has been advocated due to the superior accuracy on both seeds localization and soft tissue delineation. However, CT deposits additional radiation to the patient, and seed identification in CT requires manual review and correction. In this study, we propose an accurate, low-dose, and cost-effective post-implant dosimetry approach based on X-ray and MRI. METHODS: Implanted seeds are reconstructed using only three X-ray fluoroscopy images by solving a combinatorial optimization problem...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27993443/-percutaneous-closure-of-persistent-ductus-arteriosus-in-low-weight-infants
#9
M Hassine, S Hamdi, D Mlayeh, W Jomaa, K Ben Hamda, H Gamra, F Maatouk
INTRODUCTION: The persistent ductus arteriosus remains a common congenital pathology. Although percutaneous closure of wide channels using an Amplatzer Duct Occluder is an attractive alternative to the surgical treatment, this prosthesis is not recommended for infants weighing less than 6kg. AIM OF THE STUDY: The objective was to evaluate the efficacy and safety of this prosthesis in low-weight children. PATIENTS AND METHODS: The records of children weighing less than 6kg who underwent closure with the Amplatzer Duct Occluder prosthesis between January 2010 and December 2014 were retrospectively analyzed...
February 2017: Archives de Pédiatrie: Organe Officiel de la Sociéte Française de Pédiatrie
https://www.readbyqxmd.com/read/27915135/primary-stability-and-viscoelastic-displacement-of-mini-implant-system-under-loading
#10
Jim Lee, Yong-Hoon Jeong, Joseph Pittman, Toru Deguchi, William M Johnston, Henry W Fields, Do-Gyoon Kim
BACKGROUND: The objectives of the current study were to examine the effects of mini-implant diameters on 1) primary stability before bone properties are changed by active peri-implant bone remodeling and 2) the time-dependent displacement of mini-implant systems in bone under a functional radial loading and their associations with bone mineral density. METHODS: Twenty one, 8mm length mini-implants (7 each for 1.4mm, 1.6mm, and 2mm diameters) were placed in mandibular sections of human cadavers (4 males and 3 females, average 69...
November 24, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27875131/non-invasive-personalisation-of-a-cardiac-electrophysiology-model-from-body-surface-potential-mapping
#11
Sophie Giffard-Roisin, Thomas Jackson, Lauren Fovargue, Jack Lee, Herve Delingette, Reza Razavi, Nicholas Ayache, Maxime Sermesant
Modelling cardiac electrophysiology (EP) can help understand pathologies and predict the response to therapies. Moreover, estimating patient-specific parameters of the EP model is crucial to obtain personalised information. The novelty of this paper is to use non-invasive data (body surface potential mapping, BSPM) in order to personalise the main parameters of a cardiac EP model for predicting different pacing conditions. First, an efficient forward model is proposed, coupling the Mitchell- Schaeffer transmembrane potential model with a current dipole formulation...
November 16, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27769514/characterizing-fluoroscopy-based-kinematic-accuracy-as-a-function-of-pulse-width-and-velocity
#12
Arin M Ellingson, Joseph D Mozingo, Dixon J Magnuson, Mark W Pagnano, Kristin D Zhao
Fluoroscopic imaging has become increasingly popular to investigate total knee arthroplasty kinematics non-invasively - 3D implant models are aligned with 2D image projections, and optimized via an edge-contour alignment technique. Previous studies have quantified the accuracy of this approach, however they do not always adequately address the impact of image collection parameters. A particularly sensitive parameter is the pulse width, or exposure time per frame. At longer pulse widths, more motion is captured in a single frame; this can lead to image blur and subsequent degradation to image edge quality...
November 7, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27716970/soft-tissue-volume-augmentation-at-dental-implant-sites-using-a-volume-stable-three-dimensional-collagen-matrix-histological-outcomes-of-a-preclinical-study
#13
Daniel S Thoma, Nadja Naenni, Goran I Benic, Christoph H F Hämmerle, Ronald E Jung
AIM: The aim of this study was to test whether or not soft tissue augmentation with a collagen matrix (VCMX) leads to a similar increase in ridge width around dental implants compared to the use of an autogenous subepithelial connective tissue graft (SCTG). MATERIALS AND METHODS: In 12 dogs, immediate dental implants were placed with simultaneous guided bone regeneration. Three months later, soft tissue volume augmentation was performed by randomly allocating three treatment modalities to these sites [VCMX, SCTG, sham-operated group (control)]...
October 7, 2016: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/27693985/accuracy-of-meg-in-localizing-irritative-zone-and-seizure-onset-zone-quantitative-comparison-between-meg-and-intracranial-eeg
#14
Daeyoung Kim, Eun Yeon Joo, Dae-Won Seo, Min-Young Kim, Yong-Ho Lee, Hyuk Chan Kwon, Jae-Moon Kim, Seung Bong Hong
BACKGROUND: We conducted the study to examine accuracy of the magnetoencephalography (MEG) spike source localization in presurgical evaluation of patients with medically refractory focal epilepsy. METHODS: Ten consecutive patients with refractory focal epilepsy who were candidates for two-stage surgery with long-term intracranial electroencephalography (ICEEG) monitoring were enrolled. Interictal MEG recordings with simultaneous scalp EEG were obtained within 7days before the ICEEG electrode implantation...
August 16, 2016: Epilepsy Research
https://www.readbyqxmd.com/read/27620655/correction-of-buccal-dehiscence-during-immediate-implant-placement-using-the-flapless-technique-a-tomographic-evaluation
#15
Jamal Hassan Assaf, Débora do Canto Assaf, Raquel Pippi Antoniazzi, Leandro Berni Osório, Fabiana Mantovani Gomes França
BACKGROUND: The aim of this study was to evaluate a new technique for treating dehiscence buccal bone sites (Class II) with immediate implant and collagen-enriched bovine-derived xenograft blocks without a surgical flap or membrane. METHODS: Individuals with at least 5 mm of buccal bone dehiscence were selected for a flapless surgical approach to insert xenograft blocks into buccal dehiscence defects as well as the gap between implant and residual bone wall. No membrane was used...
February 2017: Journal of Periodontology
https://www.readbyqxmd.com/read/27617433/prosthetic-mismatch-and-subscapularis-tear-effects-on-glenohumeral-contact-pattern-in-total-shoulder-arthroplasty-a-musculoskeletal-numerical-analysis
#16
Lauranne Sins, Patrice Tétreault, Natalia Nuño, Nicola Hagemeister
Prosthetic components mismatch and subscapularis tear are determining factors for glenoid failure complication in non-conforming total shoulder arthroplasty. Risk factors are linked to glenoid prosthetic loading. However, the mechanisms underlying the clinical observations remain unclear. This study assessed the combined impact of mismatch and subscapularis tear on glenoid loading. It was assumed that adequate glenoid loading was associated with minimal, but non-null, humeral head translations and contact pressure, as well as with maximal glenoid contact area, and that the center of pressure on the glenoid would have a centered displacement pattern...
September 12, 2016: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/27528116/the-accuracy-of-extracted-target-motion-trajectories-in-four-dimensional-cone-beam-computed-tomography-for-lung-cancer-patients
#17
Hiraku Iramina, Mitsuhiro Nakamura, Yusuke Iizuka, Takamasa Mitsuyoshi, Yukinori Matsuo, Takashi Mizowaki, Masahiro Hiraoka, Ikuo Kanno
PURPOSE: To quantify the accuracy of extracted target motion trajectories in dual-source four-dimensional cone-beam computed tomography (4D-CBCT) by comparison with the actual three-dimensional (3D) target motion acquired simultaneously during 4D-CBCT scan. MATERIALS AND METHODS: 4D-CBCT scans were performed for 19 different sinusoidal-like patterns and 13 lung cancer patients with implanted markers. Internal (In) or external (Ex) surrogates with amplitude (Amp)- or phase (Ph)-based sorting were used for the reconstructions...
August 12, 2016: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/27435361/the-outcome-of-unstable-proximal-femoral-fracture-treated-with-reverse-liss-plates
#18
Shih-Jie Lin, Kuo-Chin Huang, Po-Yao Chuang, Chien-Yin Lee, Tsan-Wen Huang, Mel S Lee, Robert Wen-Wei Hsu
BACKGROUND: The Russel-Taylor type 2B fractures compromised the trochanteric region and medial buttress of proximal femur. This fracture pattern limits the choice of implants and raises the risk of adverse outcomes. We aimed to (i) determine the outcome of Russel-Taylor type 2B fractures treated using reverse less invasive stabilization system plates (LISS-DF) and to (ii) learn what factors affected outcomes after osteosynthesis with reverse LISS plates. DESIGN: A retrospective study SETTING: The study was conducted at a Level III trauma center in Taiwan...
October 2016: Injury
https://www.readbyqxmd.com/read/27426891/nasal-or-canthal-alar-parentheses-a-study-of-the-facial-base-of-the-nose
#19
G Bonfort, D T Nguyen, C Rumeau, R Jankowski
OBJECTIVES: The facial implantation of the osseous nasal pyramid corresponds to the piriform aperture, the shape of which is projected on the facial skin in the form of bracket-shaped parentheses. The objective of this study was to compare inter-parenthesis width with subjective visibility on frontal photographs. MATERIAL AND METHODS: The "patient" group came from a retrospective cohort of photographs taken ahead of septorhinoplasty. The "model" group photographs were collected from the Web or magazines...
December 2016: European Annals of Otorhinolaryngology, Head and Neck Diseases
https://www.readbyqxmd.com/read/27404705/optical-coherence-tomography-guidance-for-percutaneous-coronary-intervention-with-bioresorbable-scaffolds
#20
Gianluca Caiazzo, Giovanni Longo, Alessandra Giavarini, Ismail Dogu Kilic, Enrico Fabris, Roberta Serdoz, Alessio Mattesini, Nicolas Foin, Gioel Gabrio Secco, Salvatore De Rosa, Ciro Indolfi, Carlo Di Mario
BACKGROUND: The effect of optical coherence tomography (OCT) guidance on the implantation strategy during all phases of percutaneous coronary intervention (PCI) with bioresorbable vascular scaffolds (BVSs) in a real-world scenario has been poorly investigated. METHODS: Consecutive patients undergoing BVS implantation at our institution were included in this registry. Frequency-domain OCT pullbacks were performed at the operator's discretion during all phases of BVS implantation procedures to optimize preparation of lesions, confirm BVS size, and optimize expansion and apposition of scaffolds...
October 15, 2016: International Journal of Cardiology
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