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https://www.readbyqxmd.com/read/28106147/prediction-of-very-late-arrhythmia-recurrence-after-radiofrequency-catheter-ablation-of-atrial-fibrillation-the-mb-later-clinical-score
#1
Nebojša Mujović, Milan Marinković, Nebojša Marković, Alena Shantsila, Gregory Y H Lip, Tatjana S Potpara
Reliable prediction of very late recurrence of atrial fibrillation (VLRAF) occuring >12 months after catheter ablation (CA) in apparently "cured" patients could optimize long-term follow-up and modify decision-making regarding the discontinuation of oral anticoagulant therapy. In a single-centre cohort of consecutive patients post radiofrequency AFCA, we retrospectively derived a novel score for VLRAF prediction. Of 133 consecutive post AFCA patients (mean age 56.9 ± 11.8 years, 63.9% male, 69.2% with paroxysmal AF) who were arrhythmia-free at 12 months (excluding 3-month "blanking period"), 20 patients expirienced a VLRAF during a 29...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28106136/long-term-exposure-to-835%C3%A2-mhz-rf-emf-induces-hyperactivity-autophagy-and-demyelination-in-the-cortical-neurons-of-mice
#2
Ju Hwan Kim, Da-Hyeon Yu, Yang Hoon Huh, Eun Ho Lee, Hyung-Gun Kim, Hak Rim Kim
Radiofrequency electromagnetic field (RF-EMF) is used globally in conjunction with mobile communications. There are public concerns of the perceived deleterious biological consequences of RF-EMF exposure. This study assessed neuronal effects of RF-EMF on the cerebral cortex of the mouse brain as a proxy for cranial exposure during mobile phone use. C57BL/6 mice were exposed to 835 MHz RF-EMF at a specific absorption rate (SAR) of 4.0 W/kg for 5 hours/day during 12 weeks. The aim was to examine activation of autophagy pathway in the cerebral cortex, a brain region that is located relatively externally...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28106118/small-window-parametric-imaging-based-on-information-entropy-for-ultrasound-tissue-characterization
#3
Po-Hsiang Tsui, Chin-Kuo Chen, Wen-Hung Kuo, King-Jen Chang, Jui Fang, Hsiang-Yang Ma, Dean Chou
Constructing ultrasound statistical parametric images by using a sliding window is a widely adopted strategy for characterizing tissues. Deficiency in spatial resolution, the appearance of boundary artifacts, and the prerequisite data distribution limit the practicability of statistical parametric imaging. In this study, small-window entropy parametric imaging was proposed to overcome the above problems. Simulations and measurements of phantoms were executed to acquire backscattered radiofrequency (RF) signals, which were processed to explore the feasibility of small-window entropy imaging in detecting scatterer properties...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28106018/cardioneuroablation-in-the-treatment-of-neurally-mediated-reflex-syncope-a-review-of-the-current-literature
#4
Tolga Aksu, Tümer Erdem Güler, Serdar Bozyel, Kazım Serhan Özcan, Kıvanç Yalın, Ferit Onur Mutluer
OBJECTIVE: An imbalance between parasympathetic and sympathetic tone is a main cause of neurally mediated reflex syncope (NMRS). These patients may be very symptomatic and the condition may require cardiac pacemaker implantation. Cardioneuroablation (CNA) is a relatively novel technique based on radiofrequency ablation of vagal ganglia that can be used in treatment of NMRS. The aim of this analysis was to compare potential role of CNA in patients with NMRS. METHODS: In accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses Statement, literature search was conducted using the keywords "cardioneuroablation," "vagal denervation," "reflex syncope," "vagal ablation," and "ganglionic plexi ablation...
December 2017: Türk Kardiyoloji Derneği Arşivi: Türk Kardiyoloji Derneğinin Yayın Organıdır
https://www.readbyqxmd.com/read/28105097/curative-effects-of-rf-combined-with-dsa-guided-ethanol-sclerotherapy-in-venous-malformations
#5
Xing Wang, Jian Meng, Jie Zhang, Ruihan Wu, Jianmin Gu, Cuiling Shao, Kun Han
The aim of the study was to investigate the clinical effect of radiofrequency (RF) ablation combined with digital subtraction angiography (DSA)-guided anhydrous ethanol injection sclerotherapy in the treatment of high-return flow venous malformation (VM). Forty-one patients who were diagnosed as high-return flow VM with clinical and radiographic evidence were divided into the observation group (n=19) and control group (n=22) by random number table. All the patients received DSA-guided anhydrous ethanol injection sclerotherapy while the patients in the observation group were given RF ablation in addition...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28104923/unique-heating-curves-generated-by-radiofrequency-electric-field-interactions-with-semi-aqueous-solutions
#6
Nadia C Lara, Asad A Haider, Lon J Wilson, Steven A Curley, Stuart J Corr
Aqueous and nanoparticle-based solutions have been reported to heat when exposed to an alternating radiofrequency (RF) electric-field. Although the theoretical models have been developed to accurately model such a behavior given the solution composition as well as the geometrical constraints of the sample holder, these models have not been investigated across a wide-range of solutions where the dielectric properties differ, especially with regard to the real permittivity. In this work, we investigate the RF heating properties of non-aqueous solutions composed of ethanol, propylene glycol, and glycine betaine with and without varying amounts of NaCl and LiCl...
January 2, 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/28104089/prediction-of-radiofrequency-ablation-lesion-formation-using-a-novel-temperature-sensing-technology-incorporated-in-a-force-sensing-catheter
#7
Guy Rozen, Leon Ptaszek, Israel Zilberman, Kevin Cordaro, E Kevin Heist, Christopher Beeckler, Andres Altmann, Zhang Ying, Zhenjiang Liu, Jeremy N Ruskin, Assaf Govari, Moussa Mansour
BACKGROUND: Real-time radiofrequency (RF) ablation lesion assessment is a major unmet need in cardiac electrophysiology. OBJECTIVE: The purpose of this study was to assess whether improved temperature measurement using a novel thermocoupling (TC) technology combined with information derived from impedance change, contact force (CF) sensing, and catheter orientation allows accurate real-time prediction of ablation lesion formation. METHODS: RF ablation lesions were delivered in the ventricles of 15 swine using a novel externally irrigated-tip catheter containing 6 miniature TC sensors in addition to force sensing technology...
February 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28104073/af-ablation-guided-by-spatiotemporal-electrogram-dispersion%C3%A2-without-pulmonary-vein-isolation-a-wholly-patient-tailored-approach
#8
Julien Seitz, Clément Bars, Guillaume Théodore, Sylvain Beurtheret, Nicolas Lellouche, Michel Bremondy, Ange Ferracci, Jacques Faure, Guillaume Penaranda, Masatoshi Yamazaki, Uma Mahesh R Avula, Laurence Curel, Sabrina Siame, Omer Berenfeld, André Pisapia, Jérôme Kalifa
BACKGROUND: The use of intracardiac electrograms to guide atrial fibrillation (AF) ablation has yielded conflicting results. OBJECTIVES: The authors evaluated the usefulness of spatiotemporal dispersion, a visually recognizable electric footprint of AF drivers, for the ablation of all forms of AF. METHODS: The authors prospectively enrolled 105 patients admitted for AF ablation. AF was sequentially mapped in both atria with a 20-pole PentaRay catheter...
January 24, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28104035/-application-value-of-laparoscopic-radiofrequency-ablation-for-specific-location-hepatocellular-carcinoma
#9
H D Shi, X J Shi, H X Ma, Y R Liang, L Zhou, Y Shi
Objective: To investigate the therapeutic efficacy and safety of laparoscopic radiofrequency ablation (LRFA) for specific-location hepatocellular carcinoma. Methods: To retrospectively analyze 496 patients with specific-location hepatocellular carcinoma treated with LRFA from January 2010 to January 2015 in our hospital. There was a total of 652 hepatic lesions with a mean diameter of (2.8±1.3) cm including 397 cases with single lesion and 99 cases with multiple lesions. The hepatic lesions were adjacent to major hepatic vessels, hepatic hilar region, diaphragmatic dome, gallbladder, or gastrointestinal tract and on the surface of the liver, respectively...
January 23, 2017: Zhonghua Zhong Liu za Zhi [Chinese Journal of Oncology]
https://www.readbyqxmd.com/read/28103953/microwave-ablation-is-as-effective-as-radiofrequency-ablation-for-very-early-stage-hepatocellular-carcinoma
#10
Yun Xu, Qiang Shen, Neng Wang, Pan-Pan Wu, Bin Huang, Ming Kuang, Guo-Jun Qian
BACKGROUND: Percutaneous radiofrequency ablation (RFA) is a first-line treatment for very-early-stage hepatocellular carcinoma (HCC), whereas the efficacy of percutaneous microwave ablation (MWA) for very-early-stage HCC remains unclear. The purpose of this study was to clarify this issue by comparing the safety and efficacy of percutaneous MWA with percutaneous RFA in treating very-early-stage HCC. METHODS: Clinical data of 460 patients who were diagnosed with very-early-stage HCC and treated with percutaneous MWA or RFA between January 2007 and July 2012 at the Eastern Hepatobiliary Surgery Hospital, The Second Military Medical University, in Shanghai, China were retrospectively analyzed...
January 19, 2017: Chinese Journal of Cancer
https://www.readbyqxmd.com/read/28103837/evaluation-of-the-ablation-margin-of-hepatocellular-carcinoma-using-ceus-ct-mr-image-fusion-in-a-phantom-model-and-in-patients
#11
Kai Li, Zhongzhen Su, Erjiao Xu, Qiannan Huang, Qingjing Zeng, Rongqin Zheng
BACKGROUND: To assess the accuracy of contrast-enhanced ultrasound (CEUS)-CT/MR image fusion in evaluating the radiofrequency ablative margin (AM) of hepatocellular carcinoma (HCC) based on a custom-made phantom model and in HCC patients. METHODS: Twenty-four phantoms were randomly divided into a complete ablation group (n = 6) and an incomplete ablation group (n = 18). After radiofrequency ablation (RFA), the AM was evaluated using ultrasound (US)-CT image fusion, and the results were compared with the AM results that were directly measured in a gross specimen...
January 19, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28101960/effects-of-antegrade-accessory-pathway-conduction-on-qrs-terminal-vector-in-patients-with-pre-excitation-syndrome
#12
Renguang Liu, Q I Chen, Yang Chen, Yingjie Zhang, Zhaolong Xu, Gaopin Wang
BACKGROUND: Ventricle pre-excitation through accessory pathway changes QRS initial vector, and manifests as delta wave on ECG. However, QRS terminal vector can also be affected. METHODS: 158 patients who had single accessory pathway (AP) with antegrade conduction capacity were included and divided into 2 groups according to the ECG with or without delta wave. In 150 patients had delta wave (overt AP group) on ECG, classical pre-excitation syndrome was diagnosed before radiofrequency ablation (RFCA)...
January 19, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28101402/identification-and-removal-of-laser-induced-noise-in-photoacoustic-imaging-using-singular-value-decomposition
#13
Emma R Hill, Wenfeng Xia, Matthew J Clarkson, Adrien E Desjardins
Singular value decomposition (SVD) was used to identify and remove laser-induced noise in photoacoustic images acquired with a clinical ultrasound scanner. This noise, which was prominent in the radiofrequency data acquired in parallel from multiple transducer elements, was induced by the excitation light source. It was modelled by truncating the SVD matrices so that only the first few largest singular value components were retained, and subtracted prior to image reconstruction. The dependency of the signal amplitude and the number of the largest singular value components used for noise modeling was investigated for different photoacoustic source geometries...
January 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28101217/safety-and-effectiveness-of-percutaneous-radiofrequency-ablation-in-early-stage-renal-cell-carcinoma
#14
Hang Liu, Changzhong Gao, Hualong Yu
The purpose of this study was to analyze the safety and effectiveness of percutaneous radiofrequency ablation (RFA) in early stage renal cell carcinoma. A total of 76 patients suffering from early stage renal cell carcinoma were selected and randomly assigned into the observation group (41 cases) or the control group (35 cases). Percutaneous RFA was used in the observation group, while retroperitoneoscopic radical operation of renal cell carcinoma was used in the control group, and the operative effects were compared...
December 2016: Oncology Letters
https://www.readbyqxmd.com/read/28101203/short-term-effect-analysis-of-radiofrequency-ablation-combined-chemotherapy-on-middle-and-late-period-non-small-cell-lung-cancer
#15
Shuo Yu, Zhen Zhou Wu, Hong Tao Si, Sai Yang, Guang Mao Liu, Xiao Dong Zhao
In this study, we investigated the effect of radiofrequency ablation (RFA) combined chemotherapy on middle and late period non-small cell lung cancer (NSCLC). In total, 85 cases of middle and late period NSCLC patients were selected, and were randomly divided into the RFA combined chemotherapy group, RFA treatment group and chemotherapy group. After treatment, the three groups were followed up for computed tomography (CT) scan, and were analyzed for the effect of RFA combined chemotherapy on middle and late period NSCLC...
December 2016: Oncology Letters
https://www.readbyqxmd.com/read/28100967/anesthetic-management-in-radiofrequency-catheter-ablation-of-ventricular-tachycardia
#16
REVIEW
Yi Deng, Payam S Naeini, Mehdi Razavi, Charles D Collard, Daniel A Tolpin, James M Anton
Radiofrequency catheter ablation is increasingly being used to treat patients who have ventricular tachycardia, and anesthesiologists frequently manage their perioperative care. This narrative review is intended to familiarize anesthesiologists with preprocedural, intraprocedural, and postprocedural implications of this ablation. Ventricular tachycardia typically arises from structural heart disease, most often from scar tissue after myocardial infarction. Many patients thus affected will benefit from radiofrequency catheter ablation in the electrophysiology laboratory to ablate the foci of arrhythmogenesis...
December 2016: Texas Heart Institute Journal
https://www.readbyqxmd.com/read/28099460/impact-of-radiofrequency-ablation-induced-glisson-s-capsule-associated-complications-in-patients-with-hepatocellular-carcinoma
#17
Toru Wakamatsu, Sadahisa Ogasawara, Tetsuhiro Chiba, Masayuki Yokoyama, Masanori Inoue, Naoya Kanogawa, Tomoko Saito, Eiichiro Suzuki, Yoshihiko Ooka, Akinobu Tawada, Osamu Yokosuka
BACKGROUND: Radiofrequency ablation (RFA) is commonly used to locally treat hepatocellular carcinoma (HCC). However, when tumors are close to the Glisson's capsule, RFA may induce injury in this region, complicating therapeutic efforts. We investigated the impact of RFA-induced Glisson's capsule-associated complications on liver function and prognosis of HCC patients. METHODS: We retrospectively reviewed our patient database and found 170 early-stage HCC patients treated via RFA from April 2004 to December 2012...
2017: PloS One
https://www.readbyqxmd.com/read/28099345/trigeminal-somatosensory-evoked-potential-a-neurophysiological-tool-to-monitor-the-extent-of-lesion-of-ganglion-radiofrequency-thermocoagulation-in-idiopathic-trigeminal-neuralgia-a-case-control-study
#18
Yan-Xing Zhao, Su-Hua Miao, Yuan-Zhang Tang, Liang-Liang He, Li-Qiang Yang, Yu Ma, Jia-Xiang Ni
To reflect the extent of thermolesion of ganglion by testing the change of trigeminal somatosensory-evoked potential (TSEP) before and after ganglion radiofrequency thermocoagulation surgery (GRT), and evaluate long-term clinic effect by follow-up visiting of 1 year.Patients with idiopathic trigeminal neuralgia (TN) in the second division were enrolled between October 2014 and October 2015. They were treated with computed tomography-guided GRT and a follow-up visiting of 1 year. Bilateral TSEP measurements were performed 1 day before and 2 days after the GRT surgery...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28099329/evaluation-of-efficacy-of-transcatheter-arterial-chemoembolization-combined-with-computed-tomography-guided-radiofrequency-ablation-for-hepatocellular-carcinoma-using-magnetic-resonance-diffusion-weighted-imaging-and-computed-tomography-perfusion-imaging-a
#19
Guo-Liang Shao, Jia-Ping Zheng, Li-Wen Guo, Yu-Tang Chen, Hui Zeng, Zheng Yao
BACKGROUND: The purpose of this study is to evaluate the efficacy of transcatheter arterial chemoembolization (TACE) combined with computed tomography-guided radiofrequency ablation (CT-RFA) in the treatment of hepatocellular carcinoma (HCC) using magnetic resonance diffusion weighted imaging (MR-DWI) and CT perfusion imaging (CT-PI). METHODS: From January 2008 to January 2014, a total of 522 HCC patients receiving TACE combined with CT-RFA were included in this study...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28097733/optimized-amplitude-modulated-multiband-rf-pulse-design
#20
Samy Abo Seada, Anthony N Price, Joseph V Hajnal, Shaihan J Malik
PURPOSE: Multiband pulses are characterized by highly temporally modulated waveforms. Rapid phase or frequency modulation can be extremely demanding on the performance of radiofrequency (RF) pulse generation, which can lead to errors that can be avoided if pulses are restricted to amplitude modulation (AM) only. In this work, three existing multiband pulse design techniques are modified to produce AM waveforms. THEORY AND METHODS: Multiband refocusing pulses were designed using phase optimization, time shifting, and root flipping...
January 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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