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Monopolar radiofrequency

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https://www.readbyqxmd.com/read/29807444/increasing-radiofrequency-ablation-volumes-with-the-use-of-internally-cooled-electrodes-and-injected-hydrochloric-acid-in-ex-vivo-bovine-livers
#1
Xiong-Ying Jiang, Tian-Qi Zhang, Guo Li, Yang-Kui Gu, Fei Gao, Wang Yao, Yan-Yang Zhang, Jin-Hua Huang
PURPOSE: We used an impedance-controlled generator with an internally cooled electrode to perform radiofrequency ablation (RFA) in ex vivo bovine livers, with a single injection of either 38.5% sodium chloride (NaCl) or 10% hydrochloric acid (HCl), to determine the relative effects of these two solutions on tissue impedance, temperature and ablation volume. MATERIALS AND METHODS: We performed 10 ablations each with injections of NaCl (NaCl-RFA), HCl (HCl-RFA) or nothing (RFA-alone), with a power setting of 200 W for 15 minutes...
May 28, 2018: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29766302/technique-safety-and-feasibility-of-eus-guided-radiofrequency-ablation-in-unresectable-pancreatic-cancer
#2
Filippo Scopelliti, Antonio Pea, Rita Conigliaro, Giovanni Butturini, Isabella Frigerio, Paolo Regi, Alessandro Giardino, Helga Bertani, Marina Paini, Paolo Pederzoli, Roberto Girelli
BACKGROUND AND AIMS: Radiofrequency ablation (RFA) is a well-recognized local ablative technique applied in the treatment of different solid tumors. Intraoperative RFA has been used for non-metastatic unresectable pancreatic ductal adenocarcinoma (PDAC), showing increased overall survival in retrospective studies. A novel RFA probe has recently been developed, allowing RFA under endoscopic ultrasound (EUS) guidance. Aim of the present study was to assess the feasibility and safety of EUS-guided RFA for unresectable PDACs...
May 15, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29737030/transcatheter-electrosurgery-in-bipolar-or-monopolar-modes
#3
EDITORIAL
Jaffar M Khan, Robert J Lederman
Transcatheter electrosurgery has emerging value in a range of other new procedures that require traversing tissue (transcaval access, transcatheter Glenn Shunt) or slicing tissue (LAMPOON slicing of the mitral valve and BASILICA slicing of the aortic valve). This is the first report of bipolar radiofrequency wires used to cross lesions in humans, reported here in seven re-entry CTO cases. The bipolar configuration may provide directionality to charge without need for wire alignment and advancement, but is theoretically disadvantageous for tissue "cutting" because of problems with charge concentration...
May 1, 2018: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/29609903/transarterial-chemoembolization-tace-in-the-management-of-hepatocellular-carcinoma-results-of-a-french-national-survey-on-current-practices
#4
A Fohlen, J P Tasu, H Kobeiter, J M Bartoli, J P Pelage, B Guiu
PURPOSE: To report current practices of transarterial chemoembolization (TACE) by interventional radiologists (IR) for hepatocellular carcinoma (HCC) through a French national survey. MATERIALS AND METHODS: An electronic survey was sent by e-mail to 232 IRs performing TACE in 32 private or public centers. The survey included 66 items including indications for TACE, technical aspects of TACE, other locally available treatments for HCC, follow-up imaging and general aspects of interventional radiology practices...
March 30, 2018: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/29565952/the-effect-of-bipolar-pulsed-radiofrequency-treatment-on-chronic-lumbosacral-radicular-pain-refractory-to-monopolar-pulsed-radiofrequency-treatment
#5
Dong Gyu Lee, Yun Woo Cho, Sang Ho Ahn, Min Cheol Chang
BACKGROUND: Patients with lumbosacral radicular pain may complain of persisting pain after monopolar pulsed radiofrequency (PRF) treatment. OBJECTIVE: We evaluated the effect of bipolar PRF stimulation of the dorsal root ganglion (DRG) in patients with chronic lumbosacral radicular pain who were unresponsive to both monopolar PRF stimulation of the DRG and transforaminal epidural steroid injection (TFESI). STUDY DESIGN: This is a prospective observational study...
March 2018: Pain Physician
https://www.readbyqxmd.com/read/29524305/clinical-evaluation-of-simultaneously-applied-monopolar-radiofrequency-and-targeted-pressure-energy-as-a-new-method-for-noninvasive-treatment-of-cellulite-in-postpubertal-women
#6
Klaus Fritz, Carmen Salavastru, Magdalina Gyurova
INTRODUCTION: This study investigates noninvasive cellulite treatments based on simultaneous application of monopolar radiofrequency (RF) and targeted pressure energy to evaluate efficacy and safety and to see whether simultaneous application has any benefits in noninvasive cellulite treatments. METHODS: Thirty women with cellulite (fibrous/adipose/aqueous types) received 4 gluteofemoral treatments (~24 minutes; ~1000 cm2 ) using a simultaneous application of RF and targeted pressure energy...
March 9, 2018: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/29490593/monopolar-radiofrequency-ablation-of-thyroid-nodules-a-prospective-austrian-single-center-study
#7
Harald Dobnig, Karin Amrein
BACKGROUND: Monopolar radiofrequency ablation is currently deemed an exotic treatment option for benign thyroid nodules in many central European countries. The aim of this study was to evaluate prospectively the safety and efficacy of this method in a large patient cohort following its introduction in Austria. METHODS: Peri- and post-interventional complications were analyzed for 277 patients. Efficacy was determined for 300 and 154 nodules at 3 and 12 months post treatment, respectively...
April 2018: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/29469595/combined-treatment-for-skin-laxity-of-the-aging-face-with-monopolar-radiofrequency-and-intense-focused-ultrasound-in-korean-subjects
#8
Hyuck Hoon Kwon, Won-Yong Lee, Sun Chul Choi, Jae Yoon Jung, Youin Bae, Gyeong-Hun Park
BACKGROUND: Although various minimal invasive approaches are available for aging skin laxity, they alone may not lead to notably satisfactory results. OBJECTIVE: To evaluate the effectiveness and safety of combination regimen with monopolar radiofrequency (MRF) and intense-focused ultrasound (IFUS) in facial lifting and tightening. METHODS: Twenty-two Korean participants with aging face received a sequential single session of MRF and IFUS treatment...
February 22, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/29457510/hepatocellular-carcinoma-abutting-large-vessels-comparison-of-four-percutaneous-ablation-systems
#9
Amélie Loriaud, Alban Denys, Olivier Seror, Naik Vietti Violi, Antonia Digklia, Rafael Duran, Hervé Trillaud, Arnaud Hocquelet
PURPOSE: To compare overall local tumour progression (OLTP), defined as the failure of primary ablation or local tumour progression, with single applicator monopolar radiofrequency ablation (RFA), microwave ablation (MWA), cluster-RFA and multi-bipolar radiofrequency (mbpRFA) in the treatment of hepatocellular carcinoma (HCC) ≤ 5 cm abutting large vessels (≥3 mm). MATERIALS AND METHODS: This multicenter, retrospective, per-nodule study was performed from 2007 to 2015...
April 18, 2018: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29420589/comparison-of-switching-bipolar-ablation-with-multiple-cooled-wet-electrodes-and-switching-monopolar-ablation-with-separable-clustered-electrode-in-treatment-of-small-hepatocellular-carcinoma-a-randomized-controlled-trial
#10
RANDOMIZED CONTROLLED TRIAL
Won Chang, Jeong Min Lee, Dong Ho Lee, Jeong Hee Yoon, Yoon Jun Kim, Jung Hwan Yoon, Joon Koo Han
OBJECTIVE: A randomized controlled trial was conducted to prospectively compare the therapeutic effectiveness of switching bipolar (SB) radiofrequency ablation (RFA) using cooled-wet electrodes and switching monopolar (SM) RFA using separable clustered (SC) electrodes in patients with hepatocellular carcinomas (HCCs). MATERIALS AND METHODS: This prospective study was approved by our Institutional Review Board. Between April 2014 and January 2015, sixty-nine patients with 74 HCCs were randomly treated with RFA using either internally cooled-wet (ICW) electrodes in SB mode (SB-RFA, n = 36) or SC electrodes in SM mode (SM-RFA, n = 38)...
2018: PloS One
https://www.readbyqxmd.com/read/29415262/anatomical-comparison-of-radiofrequency-ablation-techniques-for-sacroiliac-joint-pain
#11
Shannon L Roberts, Alison Stout, Eldon Y Loh, Nathan Swain, Paul Dreyfuss, Anne M Agur
Objective: To compare the percentage of sacral lateral branches (LBs) that would be captured if lesions were created by seven current sacroiliac joint (SIJ) radiofrequency ablation (RFA) techniques: three monopolar and four bipolar. Design: Cadaveric fluoroscopy study. Setting: Anatomy and surgical skills laboratories. Subjects: Forty cadaveric SIJs. Methods: LBs were exposed, radiopaque wires were sutured to LBs, and anterior-posterior fluoroscopic images through the S1 superior endplate were obtained...
February 5, 2018: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29402149/ex-vivo-comparison-between-thyroid-dedicated-bipolar-and-monopolar-radiofrequency-electrodes
#12
Ra Gyoung Yoon, Jung Hwan Baek, Sae Rom Chung, Young Jun Choi, Jeong Hyun Lee
PURPOSE: This study evaluated the characteristics of a thyroid-dedicated bipolar RF electrode (BRFE) and compared its ablation performance with that of monopolar RF electrodes (MRFEs) in normal bovine liver blocks. METHODS: BRFE was tested on 60 bovine liver blocks with six different time-power combinations, applying 20, 30 and 40 W for 60 and 120 s. Subsequently, BRFE and MRFEs with 0.5-, 0.7- and 1-cm active tips were applied on 160 bovine liver blocks, creating 16 time-electrode combinations (10, 30, 60 and 120 s)...
February 19, 2018: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29330080/use-of-pulsed-radiofrequency-energy-device-peak-plasmablade-in-neuromodulation-implant-revisions
#13
Ismail Ughratdar, Khandkar Ali Kawsar, Rosalind Mitchell, Richard Selway, Keyoumars Ashkan
BACKGROUND: Battery replacement or revision surgery for neuromodulation implants is conventionally performed using sharp dissection. Meticulous dissection within thick scar tissue is vital to avoid damage to surrounding lead(s), which could result in more extensive revision surgery. Traditional electrosurgery devices are contraindicated as the emitted energy can be transferred to the hardware, resulting in implant or tissue damage with severe consequent complications. OBJECTIVE: We report our experience and potential applications of a novel, pulsed monopolar radiofrequency energy device (PEAK PlasmaBlade, Medtronic PLC, Minneapolis, Minnesota, USA), which facilitates dissection around implants without the risk of damaging or transmitting energy through the system...
April 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29308927/skin-thermophysiological-effects-of-448-khz-capacitive-resistive-monopolar-radiofrequency-in-healthy-adults-a-randomised-crossover-study-and-comparison-with-pulsed-shortwave-therapy
#14
Binoy Kumaran, Tim Watson
Radiofrequency-based electrophysical agents (EPA) have been used in therapy practice over several decades (e.g., shortwave therapies). Currently, there is insufficient evidence supporting such devices operating below shortwave frequencies. This laboratory-based study investigated the skin physiological effects of 448 kHz capacitive resistive monopolar radiofrequency (CRMRF) and compared them to pulsed shortwave therapy (PSWT). In a randomised crossover study, seventeen healthy volunteers received four treatment conditions - High, Low and Placebo dose conditions receiving 15-min CRMRF treatment and a Control condition receiving no intervention...
2018: Electromagnetic Biology and Medicine
https://www.readbyqxmd.com/read/29308914/numerical-study-to-establish-relationship-between-coagulation-volume-and-target-tip-temperature-during-temperature-controlled-radiofrequency-ablation
#15
Sundeep Singh, Ramjee Repaka
The present study aims at proposing a relationship between the coagulation volume and the target tip temperature in different tissues (viz., liver, lung, kidney, and breast) during temperature-controlled radiofrequency ablation (RFA). A 20-min RFA has been modelled using commercially available monopolar multi-tine electrode subjected to different target tip temperatures that varied from 70°C to 100°C with an increment of 10°C. A closed-loop feedback proportional-integral-derivative (PID) controller has been employed within the finite element model to perform temperature-controlled RFA...
2018: Electromagnetic Biology and Medicine
https://www.readbyqxmd.com/read/29235992/avoiding-neuromuscular-stimulation-in-liver-irreversible-electroporation-using-radiofrequency-electric-fields
#16
Quim Castellví, Borja Mercadal, Xavier Moll, Dolors Fondevila, Anna Andaluz, Antoni Ivorra
Electroporation-based treatments typically consist of the application of high-voltage dc pulses. As an undesired side effect, these dc pulses cause electrical stimulation of excitable tissues such as motor nerves. The present in vivo study explores the use of bursts of sinusoidal voltage in a frequency range from 50 kHz to 2 MHz, to induce irreversible electroporation (IRE) whilst avoiding neuromuscular stimulation. A series of 100 dc pulses or sinusoidal bursts, both with an individual duration of 100 µs, were delivered to rabbit liver through thin needles in a monopolar electrode configuration, and thoracic movements were recorded with an accelerometer...
January 31, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29224639/a-multinational-clinical-approach-to-assessing-the-effectiveness-of-catheter-based-ultrasound-renal-denervation-the-radiance-htn-and-require-clinical-study-designs
#17
RANDOMIZED CONTROLLED TRIAL
Laura Mauri, Kazuomi Kario, Jan Basile, Joost Daemen, Justin Davies, Ajay J Kirtane, Felix Mahfoud, Roland E Schmieder, Michael Weber, Shinsuke Nanto, Michel Azizi
Catheter-based renal denervation is a new approach to treat hypertension via modulation of the renal sympathetic nerves. Although nonrandomized and small, open-label randomized studies resulted in significant reductions in office blood pressure 6months after renal denervation with monopolar radiofrequency catheters, the first prospective, randomized, sham-controlled study (Symplicity HTN-3) failed to meet its blood pressure efficacy end point. New clinical trials with new catheters have since been designed to address the limitations of earlier studies...
January 2018: American Heart Journal
https://www.readbyqxmd.com/read/29182498/effect-of-single-session-cryogen-cooled-monopolar-radiofrequency-therapy-on-sexual-function-in-women-with-vaginal-laxity-the-viveve-i-trial
#18
Michael Krychman, Christopher G Rowan, Bruce B Allan, Scott Durbin, Ashley Yacoubian, Deborah Wilkerson
OBJECTIVE: This subanalysis of the VIVEVE I trial aimed to evaluate the impact of cryogen-cooled monopolar radiofrequency (CMRF) therapy, for the treatment of vaginal laxity, on the domains of sexual function included in the Female Sexual Function Index (FSFI). MATERIALS AND METHODS: The VIVEVE I clinical trial was prospective, randomized, single-blind, and Sham-controlled. Nine clinical study centers in Canada, Italy, Spain, and Japan were included. This subanalysis included premenopausal women with self-reported vaginal laxity who had ≥1 term vaginal delivery and a baseline FSFI total score ≤26...
March 2018: Journal of Women's Health
https://www.readbyqxmd.com/read/29135099/tissue-injury-of-the-remnant-liver-following-radiofrequency-assisted-partial-hepatectomy
#19
Petros Ypsilantis, Maria Lambropoulou, Anastasios Karayiannakis, Miroslav Milicevic, Predrag Bulajic, Dimitrios Zacharoulis, Eleni Sioka, Constantinos Simopoulos
PURPOSE: To evaluate remnant liver tissue damage in a pig model of radiofrequency (RF)-assisted liver resection employing either the sequential coagulate cut (SCC) Belgrade technique using a monopolar RF electrode or the one using the bipolar Habib-4x device. METHODS: Sixteen pigs underwent either a) resection of part of the left lateral and left median hepatic lobes employing the SCC (SCC group), the Habib-4X (H group) or the "crushclamp" technique (CC group) or b) sham operation (Sham group)...
September 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/29089682/ct-guided-radiofrequency-ablation-in-osteoid-osteoma-result-from-a-tertiary-cancer-centre-in-india
#20
Suyash S Kulkarni, Nitin S Shetty, Ashwin M Polnaya, Amit Janu, Suresh Kumar, Ajay Puri, Ashish Gulia, Venkatesh Rangarajan
AIMS: The aim of this study is to evaluate the clinical efficacy of computed tomography (CT)-guided radiofrequency (RF) ablation as a minimally invasive therapy for osteoid osteoma. MATERIALS AND METHODS: This is a retrospective analysis of prospectively maintained data of 43 symptomatic osteoid osteoma patients who were treated by radiofrequency ablation (RFA). Forty out of 43 patients were naive cases and underwent primary treatment for osteoid osteoma with RFA, whereas 3 patients included in the study underwent RFA for local recurrence after having undergone surgical treatment...
July 2017: Indian Journal of Radiology & Imaging
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