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Monopolar radiofrequency

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https://www.readbyqxmd.com/read/29235992/avoiding-neuromuscular-stimulation-in-liver-irreversible-electroporation-using-radiofrequency-electric-fields
#1
Quim Castellví, Borja Mercadal, Xavier Moll, Dolors Fondevila, Anna Andaluz, Antoni Ivorra
Electroporation based treatments typically consist in applying high voltage dc pulses. As an undesired side effect, these dc pulses cause electrical stimulation of excitable tissues such as motor nerves. In the present in vivo study, it was explored the use of bursts of sinusoidal voltage in the frequency range from 50 kHz to 2 MHz to induce irreversible electroporation (IRE) whilst avoiding neuromuscular stimulation. 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...
December 13, 2017: 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
#2
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
#3
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...
November 28, 2017: Journal of Women's Health
https://www.readbyqxmd.com/read/29135099/tissue-injury-of-the-remnant-liver-following-radiofrequency-assisted-partial-hepatectomy
#4
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
#5
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
https://www.readbyqxmd.com/read/29078867/hand-to-hand-coupling-and-strategies-to-minimize-unintentional-energy-transfer-during-laparoscopic-surgery
#6
Douglas M Overbey, Sarah A Hilton, Brandon C Chapman, Nicole T Townsend, Carlton C Barnett, Thomas N Robinson, Edward L Jones
BACKGROUND: Energy-based devices are used in nearly every laparoscopic operation. Radiofrequency energy can transfer to nearby instruments via antenna and capacitive coupling without direct contact. Previous studies have described inadvertent energy transfer through bundled cords and nonelectrically active wires. The purpose of this study was to describe a new mechanism of stray energy transfer from the monopolar instrument through the operating surgeon to the laparoscopic telescope and propose practical measures to decrease the risk of injury...
November 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/29032589/microscopic-assessment-of-the-tissue-sparing-potential-of-radiofrequency-assisted-liver-resection-techniques-in-a-porcine-model
#7
Petros Ypsilantis, Maria Lambropoulou, Miroslav Milicevic, Predrag Bulajic, Anastasios Karayiannakis, Dimitrios Zacharoulis, Constantinos Simopoulos
BACKGROUND: The aim of the present study was to microscopically assess the tissue-sparing potential of contemporary radiofrequency-assisted liver resection (RF-LR) techniques. METHODS: Twenty-four pigs were subjected to either (1) partial hepatectomy (PH) using the sequential-coagulate-cut (SCC) technique (group SCC, n = 6) using a monopolar electrode, the technique using the bipolar electrode Habib-4X (group H, n = 6) or the "crush-clamp" technique (group CC, n = 6); or (2) sham operation (group Sham, n = 6)...
October 15, 2017: Journal of Hepato-biliary-pancreatic Sciences
https://www.readbyqxmd.com/read/29031662/percutaneous-treatment-of-hepatocellular-carcinoma-state-of-the-art-and-innovations
#8
REVIEW
Jean-Charles Nault, Olivier Sutter, Pierre Nahon, Nathalie Ganne-Carrié, Olivier Séror
Percutaneous treatment of hepatocellular carcinoma (HCC) encompasses a vast range of techniques, including monopolar radiofrequency ablation (RFA), multibipolar RFA, microwave ablation, cryoablation and irreversible electroporation. RFA is considered to be one of the main curative treatments for HCC of less than 5 cm developing on cirrhosis, together with surgical resection and liver transplantation. However, controversies exist concerning the respective roles of ablation and liver resection for HCC of less than 3 to 5 cm on cirrhosis...
October 12, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/29017400/minimally-invasive-method-to-activate-the-expiratory-muscles-to-restore-cough
#9
Anthony F DiMarco, Robert T Geertman, Kutaiba Tabbaa, Rebecca R Polito, Krzysztof E Kowalski
CONTEXT: Spinal cord stimulation (SCS) via disc electrodes surgically placed via laminotomy incisions has been shown to restore an effective cough in subjects with spinal cord injury (SCI). The purpose of this study was to evaluate a new method of expiratory muscle activation utilizing spinal cord wire leads, which can be implanted with minimally invasive techniques. METHODS: In a subject with SCI, parallel wire leads with two electrode contacts were inserted percutaneously through a needle, advanced to the T9, T11 spinal levels and connected to an implanted radiofrequency receiver...
October 11, 2017: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/28940666/successful-treatment-of-trichoepithelioma-with-a-novel-insulated-monopolar-radiofrequency-microneedle-device
#10
J Y Hong, J Seok, J M Kim, Y J Jang, B J Kim
No abstract text is available yet for this article.
September 20, 2017: Clinical and Experimental Dermatology
https://www.readbyqxmd.com/read/28934795/comparisons-of-lesion-volumes-and-shapes-produced-by-a-radiofrequency-system-with-a-cooled-a-protruding-or-a-monopolar-probe
#11
David L Cedeno, Alejandro Vallejo, Courtney A Kelley, Dana M Tilley, Nitesh Kumar
BACKGROUND: Radiofrequency (RF) ablation for denervation has been utilized for decades in chronic pain management. This relies on the proper targeting of the affected nerve which may be obtained by creating an ablation lesion with a shape and volume that optimizes targeting. Various systems designed to improve lesion size are available. These include cooling the active tip (cooled-RF) and protruding the RF electrode outside the active tip (PERF). OBJECTIVES: This study compares lesion volumes of 3 commercially available RF systems: cooled-RF, "V" shaped active cannula and protruding electrode (18 g and 20 g), and monopolar RF (MRF; 16 g, 18 g, and 20 g)...
September 2017: Pain Physician
https://www.readbyqxmd.com/read/28902023/novel-modality-for-neck-rejuvenation-a-prospective-multicenter-trial-of-percutaneous-radiofrequency-ablation-of-the-cervical-branch-of-the-facial-nerve
#12
Daniel Rivlin, D Ryan Skinner, Christina Y Steinmetz-Rodriguez, Jordan S Fabrikant, Marie A Stoddard, Jeffrey J So, Shauntell J Solomon, Ronald L Moy
BACKGROUND: Neck rejuvenation offers few modalities of treatments limited to either invasive plastic surgery or temporary neuromodulation using botulinum toxin. OBJECTIVE: To access the efficacy, longevity, and safety of percutaneous monopolar radiofrequency (RF) ablation of the cervical branch of the facial nerve innervating the platysma for neck rejuvenation. MATERIALS AND METHODS: This prospective, multicenter trial enrolled 19 adult patients with noticeable platysmal banding at 2 different centers...
September 8, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28902019/a-randomized-evaluator-blinded-trial-comparing-subsurface-monopolar-radiofrequency-with-microfocused-ultrasound-for-lifting-and-tightening-of-the-neck
#13
Isabela T Jones, Isabella Guiha, Mitchel P Goldman, Douglas C Wu
BACKGROUND: Both subsurface monopolar radiofrequency (SMRF) and microfocused ultrasound with visualization (MFU-V) have demonstrated the ability to lift and tighten the neck. No head-to-head comparison study exists of these 2 technologies. OBJECTIVE: To compare the efficacy and safety of SMRF and MFU-V for the lifting and tightening of neck. MATERIALS AND METHODS: Twenty subjects aged from 18 to 65 with moderate neck skin laxity were randomized to receive either one treatment of SMRF or MFU-V...
September 8, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28895981/radiofrequency-thermocoagulation-for-the-treatment-of-lower-extremity-ischemic-pain-comparison-of-monopolar-and-bipolar-modes
#14
Dilek Destegül, Geylan Işık, Hayri Özbek, Hakkı Ünlügenç, Murat Ilgınel
OBJECTIVES: Radiofrequency thermocoagulation (RFT) has been reported to be used safely to treat ischemic lower extremity pain. The objective of the present study was to evaluate efficiency of RFT for treatment of lower extremity ischemic pain and to compare effectiveness of monopolar RFT and bipolar RFT modes. METHODS: Following ethics committee approval, 30 American Society of Anesthesiologists classification I-III patients with ischemic lower extremity pain aged between 18 and 65 years were recruited...
April 2017: Aǧrı: Ağrı (Algoloji) Derneği'nin Yayın Organıdır, the Journal of the Turkish Society of Algology
https://www.readbyqxmd.com/read/28860897/percutaneous-dual-switching-monopolar-radiofrequency-ablation-using-a-separable-clustered-electrode-a-preliminary-study
#15
Tae Won Choi, Jeong Min Lee, Dong Ho Lee, Jeong-Hoon Lee, Su Jong Yu, Yoon Jun Kim, Jung-Hwan Yoon, Joon Koo Han
OBJECTIVE: To prospectively evaluate the safety and therapeutic effectiveness of dual-switching monopolar (DSM) radiofrequency ablation (RFA) for the treatment of hepatocellular carcinoma (HCC), and to retrospectively compare the results with those of single-switching monopolar (SSM) RFA in a historical control group. MATERIALS AND METHODS: This study was approved by the Institutional Review Board, with informed consent obtained from all patients. Fifty-two HCC patients who underwent DSM-RFA using a separable clustered electrode and dual-generators were prospectively enrolled...
September 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/28807250/a-systematic-review-on-radiofrequency-assisted-laparoscopic-liver-resection-challenges-and-window-to-excel
#16
REVIEW
Isabella Reccia, Jayant Kumar, Tomokazu Kusano, Artur Zanellato, Ahmed Draz, Duncan Spalding, Nagy Habib, Madhava Pai
Laparoscopic liver resection has progressively gained acceptance as a safe and effective procedure in the treatment of benign and malignant liver neoplasms. However, blood loss remains the major challenge in liver surgery. Several techniques and devices have been introduced in liver surgery in order to minimize intraoperative haemorrhage during parenchymal transection. Radiofrequency (RF)-assisted liver resection has been shown to be an effective method to minimize bleeding in open and laparoscopic liver resection...
September 2017: Surgical Oncology
https://www.readbyqxmd.com/read/28805286/a-survey-on-monopolar-radiofrequency-treatment
#17
Dong Hye Suh, Eun Sun Hong, Hyun Joo Kim, Sang Jun Lee, Hei Sung Kim
This questionnaire-based study was aimed to measure the level of appreciation, awareness of the special tips, and practice patterns of monopolar radiofrequency among Korean dermatologists practicing a specific monopolar radiofrequency device (Thermage® Inc., Hayward, CA). A total of 82 surveys were analyzed to show that the majority of participants (78.8%) were highly satisfied with the outcomes of monopolar radiofrequency treatment. All respondents were aware of the Eye Tip 0.25 cm(2) , and the majority knew the difference between the Face tip (blue) and the Total tip (orange)...
September 2017: Dermatologic Therapy
https://www.readbyqxmd.com/read/28721494/a-comprehensive-characterization-of-parameters-affecting-high-frequency-irreversible-electroporation-lesions
#18
Tyler Miklovic, Eduardo L Latouche, Matthew R DeWitt, Rafael V Davalos, Michael B Sano
Several focal therapies are being investigated clinically to treat tumors in which surgery is contraindicated. Many of these ablation techniques, such as radiofrequency ablation and microwave ablation, rely on thermal damage mechanisms which can put critical nerves or vasculature at risk. Irreversible electroporation (IRE) is a minimally invasive, non-thermal technique to destroy tumors. A series of short electric pulses create nanoscale defects in the cell membrane, eventually leading to cell death. Typical IRE protocols deliver a series of 50-100 µs monopolar pulses...
November 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28714203/posterior-cordotomy-in-bilateral-vocal-cord-paralysis-using-monopolar-microelectrodes-and-radiofrequency-in-18-patients
#19
J Basterra, Y Castillo-Lopez, R Reboll, E Zapater, C Olavarria, F Krause, R Hernandez, M Torres, F Tocornal
Posterior cordotomy is an option in the surgical treatment of bilateral vocal cord paralysis in adduction. We present results obtained in 18 patients with bilateral vocal cord paralysis in adduction treated using microelectrodes terminal with tips in several angles, and a radiofrequency generator from 2008 to 2013. The functional outcome was evaluated using postoperative spirometry, the decannulation time, and swallowing. All patients except one were successfully decannulated and showed an increase in mid-inspiratory flow rates...
July 17, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28678582/efficacy-of-monopolar-dielectric-transmission-radio-frequency-in-panniculus-adiposus-and-cellulite-reduction
#20
Manuel Albornoz-Cabello, Alfonso Javier Ibáñez-Vera, Blanca De la Cruz-Torres
INTRODUCTION: Despite high incidence rate of cellulite, there are few studies regarding its treatment. Most of them present non-validated evaluation tools. Radio frequency is a focused treatment very used in aesthetics to reduce it. OBJECTIVES: To know the efficacy of Monopolar Dielectric Radio frequency (MDR) treatment in dynamic applications to reduce cellulite, panniculus adiposus and gluteal and posterior thigh regions. METHODS: Experimental study consisting of inferior members of nine women...
November 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
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