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Radiofrequency lesioning

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https://www.readbyqxmd.com/read/27931834/treatments-for-colorectal-liver-metastases-a-new-focus-on-a-familiar-concept
#1
REVIEW
M G Zampino, E Magni, P S Ravenda, C A Cella, G Bonomo, P Della Vigna, S Galdy, F Spada, G M Varano, G Mauri, N Fazio, F Orsi
A major challenge for the management of advanced-colorectal-cancer is the multidisciplinary approach required for the treatment of liver metastases. Reducing the burden of liver metastases with liver-directed therapy has an important impact on both survival and health-related quality of life. This paper debates the rationale and current liver-directed approaches for colorectal liver metastases based on the evidence of literature and new clinical trials. Surgery is the gold standard, when feasible, and it's the main treatment goal for patients with potentially-resectable disease as a means of prolonging progression-free survival...
December 2016: Critical Reviews in Oncology/hematology
https://www.readbyqxmd.com/read/27930718/seeing-the-invisible-revealing-atrial-ablation-lesions-using-hyperspectral-imaging-approach
#2
Narine Muselimyan, Luther M Swift, Huda Asfour, Tigran Chahbazian, Ramesh Mazhari, Marco A Mercader, Narine A Sarvazyan
BACKGROUND: Currently, there are limited means for high-resolution monitoring of tissue injury during radiofrequency ablation procedures. OBJECTIVE: To develop the next generation of visualization catheters that can reveal irreversible atrial muscle damage caused by ablation and identify viability gaps between the lesions. METHODS: Radiofrequency lesions were placed on the endocardial surfaces of excised human and bovine atria and left ventricles of blood perfused rat hearts...
2016: PloS One
https://www.readbyqxmd.com/read/27930603/strategies-to-improve-the-efficacy-of-epicardial-linear-ablation-on-the-beating-heart
#3
Yoshiyuki Watanabe, Matthew R Schill, Toshinobu Kazui, Spencer J Melby, Richard B Schuessler, Ralph J Damiano
OBJECTIVE: Creating transmural linear lesions on the beating heart is an important component of minimally invasive surgical ablation for atrial fibrillation. Animal studies have shown poor efficacy for surface bipolar radiofrequency ablation (RFA). Clinicians have developed strategies including multiple device applications and vena caval occlusion (VCO) to improve ablation efficacy. These techniques were evaluated in an acute porcine model. METHODS: In the first experiment, an RFA device was used to perform two 40-second epicardial ablations on the right atrium of six pigs...
December 7, 2016: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
https://www.readbyqxmd.com/read/27928458/anatomical-hepatectomy-for-liver-metastasis-from-rectal-adenocarcinoma-presenting-with-intrabiliary-extension-a-case-report
#4
Tetsuo Kon, Hideo Suzuki, Tatsuya Kawaguchi, Kazuyuki Gyoten, Hideki Machishi, Takashi Kurumiya, Yoshikatsu Okada
Liver metastases from colorectal carcinoma commonly form nodular lesions in the liver parenchyma. We report a case of liver metastasis from rectal adenocarcinoma that extended predominantly into the bile duct. A 62-year-old Japanese man underwent low anterior resection for rectal adenocarcinoma 9 years ago. Approximately 3 years later, he underwent radiofrequency ablation therapy for a metastatic liver tumor. Nine years after surgery, a tumor in liver segment III exhibiting intrabiliary extension was discovered; it was unclear if this was a metastatic liver tumor or intrahepatic cholangiocarcinoma...
2016: Journal of Rural Medicine: JRM
https://www.readbyqxmd.com/read/27916745/transcatheter-non-contact-microwave-ablation-may-enable-circumferential-renal-artery-denervation-while-sparing-the-vessel-intima-and-media
#5
Pierre C Qian, Michael A Barry, Sara Al-Raisi, Pramesh Kovoor, Jim Pouliopoulos, Chrishan Nalliah, Abhishek Bhaskaran, William Chik, Rahul Kurup, Virginia James, Winny Varikatt, Alistair McEwan, Aravinda Thiagalingam, Stuart P Thomas
AIMS: Trials of transcatheter renal artery denervation (RDN) have failed to show consistent antihypertensive efficacy. Procedural factors and limitations of radiofrequency ablation can lead to incomplete denervation. We hypothesized that non-contact microwave catheter ablation could produce deep circumferential perivascular heating while avoiding the renal artery intima and media injury. METHOD AND RESULTS: A novel microwave catheter was designed and tested in a renal artery model consisting layers of phantom materials embedded with a thermochromic liquid crystal sheet, colour range 50-78°C...
December 6, 2016: EuroIntervention
https://www.readbyqxmd.com/read/27916360/combined-resection-and-rfa-in-colorectal-liver-metastases-stratification-of-long-term-outcomes
#6
Kazunari Sasaki, Georgios A Margonis, Nikolaos Andreatos, Yuhree Kim, Ana Wilson, Faiz Gani, Neda Amini, Timothy M Pawlik
BACKGROUND: Combined hepatic resection and radiofrequency ablation (resection-RFA) is a widely accepted multidisciplinary treatment for unresectable colorectal cancer liver metastases. Worse prognosis after resection-RFA is correlated to tumor morphology, although unfavorable morphology is inherent to this patient cohort. This study aimed to select patients who may or may not benefit from resection-RFA with the aid of tumor biology. METHOD: Data from 485 patients who underwent curative hepatectomy with or without concurrent RFA were retrospectively collected and analyzed...
November 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27911227/radiofrequency-ablation-of-spinal-osteoid-osteoma-a-prospective-study
#7
Joe Faddoul, Yara Faddoul, Sandra Kobaiter-Maarrawi, Ronald Moussa, Tony Rizk, Georges Nohra, Nabil Okais, Elie Samaha, Joseph Maarrawi
OBJECTIVE Surgery has been considered the standard treatment for spinal osteoid osteomas that are refractory to analgesic agents. Radiofrequency ablation (RFA) is a less invasive technique with established efficiency for the treatment of peripheral osteoid osteomas. The main objectives of this study are to evaluate the safety of RFA based on the results of a previous experimental study in rats conducted in the authors' laboratory and to identify its short- and long-term efficiency in the treatment of spinal osteoid osteomas...
December 2, 2016: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/27909522/safety-and-necessity-of-thermal-esophageal-probes-during-radiofrequency-ablation-for-the-treatment-of-atrial-fibrillation
#8
Antonio Fasano, Prof Emeritus, Luca Anfuso Md, Stefano Bozzi Md, Claudio Pandozi Prof
BACKGROUND: Radiofrequency ablation is extensively used to achieve pulmonary veins isolation for the cure of atrial fibrillation. Luminal esophageal temperature can be monitored by means of suitable probes to prevent the onset of lesions. OBJECTIVE: To compute the thermal field generated by the ablation, to investigate the interaction between the electromagnetic field and the probe sensors, and to provide a safe interpretation of the temperature detected by the probe, supported by clinical data...
June 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909510/interactive-in-vitro-training-in-physics-of-radiofrequency-ablation-for-physicians-and-medical-engineering-students
#9
REVIEW
Haber T, Kleister G, Selman B, Härtig J, Melichercik J, Ismer B
Radiofrequency (RF) ablation requires a complex set of devices as well as profound electrophysiological experience and substantial knowledge of physical science basics. To establish RF ablation in-vitro teaching-system, six workstations were equipped with computer-controlled RF ablation generators. Universal connection boxes allow ablation-essays with catheters of different make and model. Special wetlabs were developed combining a basin containing isotonic saline solution with a thermostat and a pump to simulate blood flow...
June 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909471/contact-force-and-atrial-fibrillation-ablation
#10
REVIEW
Ullah W, Schilling Rj, Wong T
Catheters able to measure the force and vector of contact between the catheter tip and myocardium are now available. Pre-clinical work has established that the degree of contact between the radiofrequency ablation catheter and myocardium correlates with the size of the delivered lesion. Excess contact is associated with steam pops and perforation. Catheter contact varies within the left atrium secondary to factors including respiration, location, atrial rhythm and the trans-septal catheter delivery technology used...
February 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27907904/a-new-cryoenergy-for-ventricular-tachycardia-ablation-a-proof-of-concept-study
#11
Benjamin Berte, Frédéric Sacher, Jean-Yves Wielandts, Saagar Mahida, Xavier Pillois, Rukshen Weerasooriya, Olivier Bernus, Pierre Jaïs
INTRODUCTION: Lack of transmural lesion formation during radiofrequency (RF) ablation for ventricular tachycardia (VT) is an important determinant of arrhythmia recurrence. The aim of this proof-of-concept study was to evaluate safety and efficacy of a new and more powerful cryoablation system for ventricular ablation. METHODS AND RESULTS: Five healthy female sheep (59 ± 6 kg) underwent a surgical sternotomy for epicardial and endocardial access [endocardial access via right atrial appendage and left ventricular (LV) apex]...
October 25, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/27906939/a-new-radiofrequency-ablation-procedure-to-treat-sacroiliac-joint-pain
#12
Jianguo Cheng, See Loong Chen, Nicole Zimmerman, Jarrod E Dalton, Garret LaSalle, Richard Rosenquist
BACKGROUND: Low back pain may arise from disorders of the sacroiliac joint in up to 30% of patients. Radiofrequency ablation (RFA) of the nerves innervating the sacroiliac joint has been shown to be a safe and efficacious strategy. OBJECTIVES: We aimed to develop a new RFA technique to relieve low back pain secondary to sacroiliac joint disorders. STUDY DESIGN: Methodology development with validation through prospective observational non-randomized trial (PONRT)...
November 2016: Pain Physician
https://www.readbyqxmd.com/read/27904858/interventional-therapy-of-esophageal-cancer
#13
REVIEW
Aiwu Mao
Esophageal cancer (EC) is the fourth leading cause of cancer death in China. Despite a lot of advances in diagnosis and therapy, the survival rate of patients with EC is low. There is urgent need for a variety of methods and techniques to improve the survival time and alleviate the lesions of EC. Nowadays, alternative and less invasive approaches to the treatment of ECs are being identified. Here, we review several main interventional methods at different stages of EC, including endoscopic resection, stent placement, arterial infusion, photodynamic therapy, and radiofrequency ablation...
October 2016: Gastrointestinal Tumors
https://www.readbyqxmd.com/read/27893539/comparative-efficacy-of-radiofrequency-and-pulsed-dye-laser-in-the-treatment-of-rosacea
#14
Sue-Jeong Kim, Young Lee, Young-Joon Seo, Jeung-Hoon Lee, Myung Im
BACKGROUND: Laser and light-based therapies have been used successfully in the treatment of rosacea; however, evidence is lacking regarding the efficacy of radiofrequency (RF). OBJECTIVE: This study evaluated the efficacy of RF in the treatment of rosacea compared with pulsed dye laser (PDL). METHODS: Thirty patients with rosacea (erythematotelangiectatic rosacea [ETR], n = 20; papulopustular rosacea [PPR], n = 10) were enrolled in a randomized, controlled, split-face study...
November 23, 2016: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/27858704/comparison-of-bipolar-radiofrequency-ablation-zones-in-an-in-vivo-porcine-model-correlation-of-histology-and-gross-pathological-findings
#15
Ole Gemeinhardt, Franz G M Poch, Bernhard Hiebl, Urte Kunz-Zurbuchen, Giuliano M Corte, Stefan F Thieme, Janis L Vahldiek, Stefan M Niehues, Martin E Kreis, Robert Klopfleisch, Kai S Lehmann
BACKGROUND: Continuing research ex vivo and in vivo with animal models is performed to advance the oncological safety of radiofrequency ablation (RFA) of liver tumors. In these experiments, frequently imaging modalities (e.g. MRI or CT) or macro-morphological measurements are used to determine the full extent of the different ablation zones inside of RFA lesions. However, no systematic study has been performed so far, which verified the accuracy of the macro-morphological findings. Therefore, the present study aimed to correlate histological and gross pathological findings of bipolar radiofrequency ablation zones of pig livers with regard to cell viability in vivo...
November 18, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27855466/detection-of-lesions-in-dysplastic-barrett-s-esophagus-by-community-and-expert-endoscopists
#16
Dirk W Schölvinck, Kim van der Meulen, Jacques J G H M Bergman, Bas L A M Weusten
Background and aims: Endoscopic treatment of Barrett's esophagus (BE) consists of endoscopic resection of visible lesions followed by radiofrequency ablation (RFA) for any remaining flat BE. Because RFA is only justified in flat BE, detection of neoplastic lesions (high grade dysplasia [HGD] and early adenocarcinoma [EAC]) is crucial. We hypothesized that the detection of visible lesions containing HGD or EAC would be superior in BE expert centers compared with community hospitals, thereby supporting centralization of therapy for BE-related neoplasia...
November 17, 2016: Endoscopy
https://www.readbyqxmd.com/read/27849406/curative-effects-of-microneedle-fractional-radiofrequency-system-on-skin-laxity-in-asian-patients-a-prospective-double-blind-randomized-controlled-face-split-study
#17
Wenli Lu, Pinru Wu, Zhen Zhang, Jinan Chen, Xiangdong Chen, Biskup Ewelina
BACKGROUND: To date, no studies compared curative effects of thermal lesions in deep and superficial dermal layers in the same patient (face-split study). OBJECTIVE: To evaluate skin laxity effects of microneedle fractional radiofrequency induced thermal lesions in different dermal layers. METHODS AND MATERIALS: 13 patients underwent three sessions of a randomized face-split microneedle fractional radiofrequency system (MFRS) treatment of deep dermal and superficial dermal layer...
November 16, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/27812781/ct-perfusion-for-early-response-evaluation-of-radiofrequency-ablation-of-focal-liver-lesions-first-experience
#18
Herman P Marquez, Gilbert Puippe, Rishi Philip Mathew, Hatem Alkadhi, Thomas Pfammatter, Michael A Fischer
PURPOSE: To investigate the value of perfusion CT (P-CT) for early assessment of treatment response in patients undergoing radiofrequency ablation (RFA) of focal liver lesions. METHODS AND MATERIALS: 20 consecutive patients (14 men; mean age 64 ± 14) undergoing P-CT within 24 h after RFA of liver metastases (n = 10) or HCC (n = 10) were retrospectively included. Two readers determined arterial liver perfusion (ALP, mL/min/100 mL), portal liver perfusion (PLP, mL/min/100 mL), and hepatic perfusion index (HPI, %) in all post-RFA lesions by placing a volume of interest in the necrotic central (CZ), the transition (TZ), and the surrounding parenchymal (PZ) zone...
November 3, 2016: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/27811527/a-cadaveric-study-evaluating-the-feasibility-of-an-ultrasound-guided-diagnostic-block-and-radiofrequency-ablation-technique-for-sacroiliac-joint-pain
#19
Shannon L Roberts, Robert S Burnham, Anne M Agur, Eldon Y Loh
BACKGROUND AND OBJECTIVES: Ultrasound (US)-guided diagnostic block/radiofrequency ablation (RFA) along the lateral sacral crest (LSC) has been proposed for managing sacroiliac joint (SIJ) pain. We sought to investigate (1) ease of visualization of bony landmarks using US; (2) consistency of US-guided needle placement along the LSC; and (3) percentage of the posterior sacral network (PSN) innervating the SIJ complex that would be captured if an RFA strip lesion were created between the needles...
November 2, 2016: Regional Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/27807370/role-of-endoscopy-in-early-oesophageal-cancer
#20
REVIEW
Jayan Mannath, Krish Ragunath
Incidence of oesophageal adenocarcinoma has increased exponentially in the West over the past few decades. Following detection of advanced cancers, 5-year survival rates remain bleak, making identification of early neoplasia, which has a better outcome, important. Detection of subtle oesophageal lesions during endoscopy can be challenging, and advanced imaging techniques might improve their detection. High-definition endoscopy has become a standard in most endoscopy centres, and this technology probably provides better delineation of mucosal features than standard-definition endoscopy...
November 3, 2016: Nature Reviews. Gastroenterology & Hepatology
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