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Roderick J Finlayson, Atikun Thonnagith, Maria Francisca Elgueta, Jordi Perez, John-Paul B Etheridge, De Q H Tran
BACKGROUND AND OBJECTIVES: Novel multitined cannulae constitute an attractive option for ultrasound-guided radiofrequency neurotomy of cervical medial branches. The deployment tines increase the cannula's active area, thus altering its lesion size. Despite their theoretical benefits, multitined cannulae have not been assessed. In this bench study, we sought to investigate the lesions produced by a standard 18-gauge and 2 commercially available multitined deployment cannulae. We created ex vivo models to evaluate lesion morphology at a periosteal interface using approach angles likely to be encountered during an ultrasound-guided technique...
October 21, 2016: Regional Anesthesia and Pain Medicine
R-C Zhao, W Han, J Han, J Yu, J Guo, J-L Fu, Z Li, R-Z Zhao
OBJECTIVE: To study the efficacy and safety of radiofrequency catheter ablation (RFCA) in patients with different forms of atrial fibrillation. PATIENTS AND METHODS: By retrospective analysis, we summarize 720 cases, where patients diagnosed with atrial fibrillation in our hospital were treated with RFCA from February 2010 to October 2014. Among the cases, 425 were diagnosed with paroxysmal atrial fibrillation and 295 with non-paroxysmal atrial fibrillation (including persistent atrial fibrillation and permanent atrial fibrillation)...
October 2016: European Review for Medical and Pharmacological Sciences
Vincent Gras, Alexandre Vignaud, Alexis Amadon, Franck Mauconduit, Denis Le Bihan, Nicolas Boulant
PURPOSE: A multispoke specific absorption rate (SAR) -aware pulse design approach for homogeneous multiple-slice small and large flip angle (FA) excitations with parallel transmission is proposed. The approach aims at optimizing in a slice-specific manner the spokes locations and radiofrequency pulses. METHODS: The problem is posed as a set of slice-specific magnitude-least-squares problems, linked together by hardware and SAR constraints, and solved jointly using an active-set algorithm...
October 23, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Desmond H Y Tse, Christopher J Wiggins, Benedikt A Poser
PURPOSE: In order to fully benefit from the improved signal-to-noise and contrast-to-noise ratios at 9.4T, the challenges of B1+ inhomogeneity and the long acquisition time of high-resolution 2D gradient-recalled echo (GRE) imaging were addressed. THEORY AND METHODS: Flip angle homogenized excitations were achieved by parallel transmission (pTx) of 3-spoke pulses, designed by magnitude least-squares optimization in a slice-by-slice fashion; the acquisition time reduction was achieved by simultaneous multislice (SMS) pulses...
October 23, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Abhijeet B Shelke, Rajeev Menon, Anuj Kapadiya, Sachin Yalagudri, Daljeet Saggu, Sandeep Nair, C Narasimhan
OBJECTIVE: Alcohol septal ablation (ASA) is a therapeutic alternative to surgical myectomy in patients with hypertrophic obstructive cardiomyopathy (HOCM). However, the anatomical variability of the septal branch, risk of complete heart block, and late onset ventricular arrhythmias are limitations to its therapeutic usage. There is recent interest in the use of radiofrequency catheter ablation (RFCA) as a therapeutic option in HOCM. We aimed to assess the safety and efficacy of RFCA in the treatment of symptomatic HOCM...
September 2016: Indian Heart Journal
D I Branovan, M Fridman, O Krasko, M Lushchik, V Drozd, N Shiglik, L Danilova, Y Demidchik
No abstract text is available yet for this article.
February 2016: Pathology
Yuki Kuroda, Kenji Minakata, Kazuhiro Yamazaki, Hisashi Sakaguchi, Kyokun Uehara, Ryuzo Sakata
No abstract text is available yet for this article.
November 2016: Annals of Thoracic Surgery
Napatthaorn Pongsrihadulchai, Thep Chalermchai, Suwirakorn Ophaswongse, Suriya Pongsawat, Montree Udompataikul
BACKGROUND: Striae distensae (SD) is a form of dermal scar. A number of treatments have been proposed, but they usually have unsatisfactory result especially in striae alba. Recently, nanofractional RF has been developed. Its mechanism of action is to stimulate dermal remodeling and epidermal re-epithelization. AIM: To evaluate the efficacy and safety of nanofractional RF in the treatment of striae alba. PATIENTS/METHODS: This is an experimental, assessor-blinded, before-after study...
October 21, 2016: Journal of Cosmetic Dermatology
M Arcan Ertürk, Xiaoping Wu, Yiğitcan Eryaman, Pierre-François Van de Moortele, Edward J Auerbach, Russell L Lagore, Lance DelaBarre, J Thomas Vaughan, Kâmil Uğurbil, Gregor Adriany, Gregory J Metzger
PURPOSE: To explore the potential of performing body imaging at 10.5 Tesla (T) compared with 7.0T through evaluating the transmit/receive performance of similarly configured dipole antenna arrays. METHODS: Fractionated dipole antenna elements for 10.5T body imaging were designed and evaluated using numerical simulations. Transmit performance of antenna arrays inside the prostate, kidneys and heart were investigated and compared with those at 7.0T using both phase-only radiofrequency (RF) shimming and multi-spoke pulses...
October 21, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Hong Shang, Subramaniam Sukumar, Cornelius von Morze, Robert A Bok, Irene Marco-Rius, Adam Kerr, Galen D Reed, Eugene Milshteyn, Michael A Ohliger, John Kurhanewicz, Peder E Z Larson, John M Pauly, Daniel B Vigneron
PURPOSE: Balanced steady-state free precession (bSSFP) sequences can provide superior signal-to-noise ratio efficiency for hyperpolarized (HP) carbon-13 ((13) C) magnetic resonance imaging by efficiently utilizing the nonrecoverable magnetization, but managing their spectral response is challenging in the context of metabolic imaging. A new spectrally selective bSSFP sequence was developed for fast imaging of multiple HP (13) C metabolites with high spatiotemporal resolution. THEORY AND METHODS: This novel approach for bSSFP spectral selectivity incorporates optimized short-duration spectrally selective radiofrequency pulses within a bSSFP pulse train and a carefully chosen repetition time to avoid banding artifacts...
October 21, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Robert N Goldstone, Shirin R Hasan, Steven Drury, Teresa M Darragh, Annemieke van Zante, Stephen E Goldstone
PURPOSE: Radiofrequency ablation (RFA) effectively treats esophageal high-grade dysplasia, but its efficacy in treating anal canal high-grade squamous intraepithelial lesions (HSILs) is unsubstantiated. This prospective study assessed the safety and efficacy of applying hemi-circumferential RFA to anal canal HSIL. METHODS: Twenty-one HIV-negative participants with HSIL occupying ≤ half the anal canal circumference were treated with hemi-circumferential anal canal RFA...
October 21, 2016: International Journal of Colorectal Disease
Korgün Ökmen, Burcu Metin Ökmen
This study aims to investigate the efficacy of three different percutaneous intradiscal therapies in patients with chronic low back pain (CLBP) due to lumbar disc herniation (LDH). Medical files of a total of 120 patients who received percutaneous intradiscal therapy were retrospectively analyzed. All patients were divided into three groups: group L: diode laser (n = 40), group R: radiofrequency (RF) (n = 40), and group P: pulsed radiofrequency (PRF) (n = 40). The visual analogue scale (VAS) and Oswestry Disability Index (ODI) scores were calculated at 1, 3, 6, and 12 months for all patients...
October 21, 2016: Lasers in Medical Science
J M Madrid Pérez, P M García Barquín, A J Villanueva Marcos, J I García Bolao, G Bastarrika Alemañ
OBJECTIVE: Radiofrequency ablation is an efficacious alternative in patients with symptomatic atrial fibrillation who do not respond to or are intolerant to at least one class I or class III antiarrhythmic drug. Although radiofrequency ablation is a safe procedure, complications can occur. Depending on the location, these complications can be classified into those that affect the pulmonary veins themselves, cardiac complications, extracardiac intrathoracic complications, remote complications, and those that result from vascular access...
October 18, 2016: Radiología
Wei Liu, Jichun Jiang, Keyong Hou, Weiguo Wang, Yachen Qi, Yan Wang, Yuanyuan Xie, Lei Hua, Haiyang Li
Chlorinated benzenes are typical precursors and indicators for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) emissions from waste incinerators. Online and real-time monitoring of chlorobenzenes is a challenge due to their low concentration and complex nature of the flue gas. In this work, a continuous online monitoring system was built for detection of trace chlorinated benzenes based on a time-of-flight mass spectrometer (TOFMS). A single photon ionization (SPI) source based on a radiofrequency-excited windowless vacuum ultraviolet (VUV) lamp was developed for the first time to eliminate the signal attenuation resulting from the contamination of magnesium fluoride windows and to avoid the fragment ions...
December 1, 2016: Talanta
Itsuko Tsukimura, Hideki Murakami, Makoto Sasaki, Hirooki Endo, Daisuke Yamabe, Ryosuke Oikawa, Minoru Doita
The safety of metallic spinal implants in magnetic resonance imaging (MRI) performed using ultrahigh fields has not been established. Hence, we examined whether the displacement forces caused by a static magnetic field and the heating induced by radiofrequency radiation are substantial for spinal implants in a 7 T field. We investigated spinal rods of various lengths and materials, a screw, and a cross-linking bridge in accordance with the American Society for Testing and Materials guidelines. The displacement forces of the metallic implants in static 7 T and 3 T static magnetic fields were measured and compared...
October 21, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Xiao Zheng, Zhi Yuan Bo, Wei Wan, Ye Chen Wu, Tian Tian Wang, Jun Wu, Dao Jian Gao, Bing Hu
AIM: Endoscopic biliary radiofrequency ablation (RFA) has been increasingly used for unresectable malignant biliary obstruction (MBO). However, its efficacy and safety remain unclear. METHODS: A comprehensive search of Cochrane Library, PubMed and EMBASE was conducted to collect studies to evaluate endoscopic biliary RFA in the management of MBO. Meta-analysis was performed by extracting the data from included studies with regards to the technical effectiveness, overall survival, adverse events and mortality of endoscopic RFA...
October 21, 2016: Journal of Digestive Diseases
Ai Ueki, Tomohisa Okuma, Shinichi Hamamoto, Yukio Miki
Purpose To evaluate survival time with concurrent, combined use of radiofrequency ablation (RFA) and one of the commonly used platinum-doublet chemotherapies (cisplatin [CDDP]/paclitaxel [PTX], CDDP/vinorelbine [VNR], CDDP/adriamycin [ADR], or CDDP/pemetrexed [MTA] combinations) by using a rabbit VX2 lung tumor model. Materials and Methods The experiment was approved by the institutional animal care committee. VX2 cells were implanted into the lungs of 60 rabbits randomized into groups treated with supportive care (control group), RFA alone, chemotherapy alone (CDDP/PTX, CDDP/VNR, CDDP/ADR, or CDDP/MTA), or a combination of RFA and chemotherapy (RFA/CDDP/PTX, RFA/CDDP/VNR, RFA/CDDP/ADR, or RFA/CDDP/MTA)...
October 21, 2016: Radiology
Renzo Colombo, Hans van Valenberg, Marco Moschini, Johannes A Witjes
OBJECTIVE: An updated review of intravesical radiofrequency (RF)-induced thermo-chemotherapy effect (RITE) for NMIBC with regard to efficacy, adverse events (AEs) and perspectives. EVIDENCE ACQUISITION: An extensive and sensitive search for RF-induced chemo-hyperthermia in Medline, Embase, Cochrane and databases was performed. A table of published clinical trials up to 2016 was constructed. No meta-analysis could be performed on the basis of new papers...
October 4, 2016: Urologia
Baodong Liu, Lei Liu, Mu Hu, Kun Qian, Yuanbo Li
BACKGROUND: The purpose of this study was to retrospectively evaluate percutaneous radiofrequency ablation (RFA) combined with palliative thoracoscopic pleurodesis (TP) for malignant pleural effusion and/or pleural disseminated non-small cell lung cancer (NSCLC), diagnosed by thoracoscopy. METHODS: The study was composed of 40 patients with primary NSCLC with malignant pleural effusion and/or pleural dissemination recognized for the first time during thoracoscopic exploration...
September 2016: Thoracic Cancer
Maxime Barat, Audrey Fohlen, Christophe Cassinotto, Anne Sophie Jannot, Raphael Dautry, Jean-Pierre Pelage, Mourad Boudiaf, Marc Pocard, Clarisse Eveno, Bachir Taouli, Philippe Soyer, Anthony Dohan
PURPOSE: To assess whether apparent diffusion coefficient (ADC) values at 1 and 3 months after radiofrequency ablation (RFA) may be associated with a favorable response to therapy for hepatocellular carcinoma (HCC) and liver metastases. MATERIALS AND METHODS: Fifty-nine patients with HCC (n = 35) or liver metastases (n = 24) who underwent 1.5T diffusion-weighted magnetic resonance imaging (DWMRI) at 1 and 3 months post-RFA were included. ADC values of patients with local tumor recurrence were compared to those without local recurrence...
October 20, 2016: Journal of Magnetic Resonance Imaging: JMRI
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