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Radiofrequency lesioning

Sophinese Iskander-Rizk, Pieter Kruizinga, Antonius F W van der Steen, Gijs van Soest
Catheter-based radiofrequency ablation for atrial fibrillation has long-term success in 60-70% of cases. A better assessment of lesion quality, depth, and continuity could improve the procedure's outcome. We investigate here photoacoustic contrast between ablated and healthy atrial-wall tissue in vitro in wavelengths spanning from 410 nm to 1000 nm. We studied single- and multi-wavelength imaging of ablation lesions and we demonstrate that a two-wavelength technique yields precise detection of lesions, achieving a diagnostic accuracy of 97%...
March 1, 2018: Biomedical Optics Express
Demosthenes G Katritsis, Roy M John, Rakesh Latchamsetty, Rahul G Muthalaly, Theodoros Zografos, George D Katritsis, William G Stevenson, Igor R Efimov, Fred Morady
BACKGROUND: Immunohistochemistry studies suggest that the anatomic substrate of the slow pathway in atrioventricular nodal reentrant tachycardia (AVNRT) is the left inferior nodal extension. We hypothesized that slow pathway ablation from the left septum is an effective alternative to right-sided ablation. METHODS AND RESULTS: We analyzed our databases of AVNRT in search of cases that had used slow pathway ablation from the left septum because of failure of right septal ablation, and then prospectively subjected consenting patients to a left septal-only procedure...
March 2018: Circulation. Arrhythmia and Electrophysiology
Yang Guang, Yu-Kun Luo, Yan Zhang, Ming-Bo Zhang, Nan Li, Ying Zhang, Jie Tang
Objective To assess the effectiveness and safety of ultrasound-guided percutaneous radiofrequency ablation (RFA) for nonsurgical treatment of metastatic lymph nodes (LNs) in the neck from papillary thyroid carcinoma (PTC). Methods Totally 45 PTC patients who had been treated with total thyroidectomy and radioiodine therapy were enrolled in this retrospective study. A total of 71 metastatic LNs in the neck from PTC were confirmed by percutaneous biopsy. Follow-up consisted of conventional ultrasound,contrast-enhanced ultrasound,and thyroglobulin (Tg) measurement 1,3 and 6 months after RFA and then every 6 months...
February 28, 2018: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
Yojiro Yutaka, Toshihiko Sato, Koichi Matsushita, Hiroyuki Aiba, Yusuke Muranishi, Yasuto Sakaguchi, Tadao Sugiura, Minoru Okada, Tatsuo Nakamura, Hiroshi Date
OBJECTIVE: We developed a novel localization technique for small intrapulmonary lesions using radiofrequency identification (RFID) technology. Micro-RFID markers with nickel-titanium coils were designed to be placed from subsegmental bronchi to the peripheral parenchyma. In this preclinical study, thoracoscopic subsegmentectomy of a canine pseudotumor model was performed to demonstrate the feasibility and three-dimensional positional accuracy of the system. METHODS: To recover subcentimeter pseudotumors, markers were bronchoscopically placed to determine the resection line: 1) next to the pseudotumor, 2) in the responsible subsegmental bronchi as the central margin, 3) on the intersubsegmental plane as the lateral margin...
March 9, 2018: Seminars in Thoracic and Cardiovascular Surgery
N Golse, A El Bouyousfi, F Marques, B Bancel, K Mohkam, C Ducerf, P Merle, M Sebagh, D Castaing, A Sa Cunha, R Adam, D Cherqui, E Vibert, J-Y Mabrut
BACKGROUND: Hepatectomy remains the standard treatment for large hepatocellular carcinoma (LHCC) ≥5cm. Fibrosis may constitute a contraindication for resection because of high risk of post-hepatectomy liver failure, but its impact on patient outcome and cancer recurrence remains ill defined. Our aim was to compare predictors of survival in patients with and without cirrhosis following hepatectomy for LHCC. METHODS: The data on consecutive patients undergoing hepatectomy for LHCC in two tertiary centres between 2012 and 2016 were reviewed...
March 7, 2018: Journal of Visceral Surgery
Grzegorz Suwalski, Robert Emery, Jakub Mróz, Kamil Kaczejko, Leszek Gryszko, Andrzej Cwetsch, Andrzej Skrobowski
OBJECTIVES: In patients undergoing cardiac surgical procedures, pulmonary vein isolation may be easily accomplished, and it is important to achieve bidirectional conduction block across created lesions. The primary aim of this study was to assess the risk of pulmonary vein stenosis (PVS) after multiple applications of epicardial bipolar radiofrequency energy. METHODS: Thirty-five consecutive patients who were referred for off-pump coronary revascularization with concomitant pulmonary vein isolation and left atrial appendage occlusion were prospectively included in the study...
March 7, 2018: Interactive Cardiovascular and Thoracic Surgery
P Vavra, L Karnik, M Skrobankova, J Jurcikova, P Ihnat, P Zonca, M Peteja, A El-Gendi, S Czudek
Liver resection is the standard treatment for any liver lesion. Laparoscopic liver resection is associated with lower intra-operative blood loss and fewer complications than open resection. Access to the posterior part of the right liver lobe is very uncomfortable and difficult for surgeons due the anatomic position, especially when employing laparoscopic surgery. Based on these experiences, a new laparoscopic device was developed that is capable of bending its long axis and allowing the application of radiofrequency energy in areas that were not technically accessible...
March 1, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
Naïk Vietti Violi, Rafael Duran, Nicolas Demartines, Christine Sempoux, Boris Guiu, Pierre E Bize, Nathalie Sala, Nermin Halkic, Jean-Francois Knebel, Alban Denys
PURPOSE: To compare local recurrence (LR) rate in patients with colorectal cancer liver metastasis (CRCLM) after surgical wedge resection (WR) or radiofrequency ablation (RFA) and to investigate predictive factors of LR. MATERIALS AND METHODS: This single-centre, retrospective, institutional review board-approved study including 43 consecutive patients with 121 metastases treated by WR and 60 patients with 110 metastases treated by RFA between 2007 and 2014 with 23 and 18...
March 5, 2018: International Journal of Hyperthermia
Naïk Vietti Violi, Rafael Duran, Boris Guiu, Jean-Pierre Cercueil, Christophe Aubé, Antonia Digklia, Isabelle Pache, Pierre Deltenre, Jean-François Knebel, Alban Denys
BACKGROUND: Radiofrequency ablation is the recommended treatment for patients with hepatocellular carcinoma who have lesions smaller than 3 cm and are therefore not candidates for surgery. Microwave ablation is a more recent technique with certain theoretical advantages that have not yet been confirmed clinically. We aimed to compare the efficacy of both techniques in the treatment of hepatocellular carcinoma lesions of 4 cm or smaller. METHODS: We did a randomised controlled, single-blinded phase 2 trial at four tertiary university centres in France and Switzerland...
March 1, 2018: Lancet. Gastroenterology & Hepatology
Osama A Zarzour, Fernando Ruiz Santiago, Nicolas Olea Serrano, Abdelkareem Hassan Abdallah, Mostafa Ahmad El-Sharkawy, Amr Farouk Mourad
INTRODUCTION: Aneurysmal bone cyst (ABC) is one of most therapeutic challenging lesions for orthopedic surgeons specially in large-sized lesions and lesions, which are very close to important neurovascular structures. In the present study, we express our experience in the treatment of aneurysmal bone cyst by radiofrequency thermal ablation (RFTA). METHODS: In the last two years, we have treated 20 cases (12 males & 8 females) presented with painful aneurysmal bone cysts in different anatomical locations, the age mean (±SD) is 18...
March 2018: European Journal of Radiology
Ean H Ooi, Nicholas J Y Chia, Ean T Ooi, Ji J Foo, Iman Y Liao, Shalini R Nair, Ahmad F Mohd Ali
A recent study by Ooi and Ooi (EH Ooi, ET Ooi, Mass transport in biological tissues: Comparisons between single- and dual-porosity models in the context of saline-infused radiofrequency ablation, Applied Mathematical Modelling, 2017, 41, 271-284) has shown that single-porosity (SP) models for describing fluid transport in biological tissues significantly underestimate the fluid penetration depth when compared to dual-porosity (DP) models. This has raised some concerns on whether the SP model, when coupled with models of radiofrequency ablation (RFA) to simulate saline-infused RFA, could lead to an underestimation of the coagulation size...
February 28, 2018: International Journal of Hyperthermia
Roh-Eul Yoo, Ji-Hoon Kim, Jin Chul Paeng, Young Joo Park
RATIONALE: Long-term recurrence rate of differentiated thyroid carcinoma has been reported to be as high as 30%. Repeat surgery may be challenging due to normal tissue plane distortion secondary to postoperative fibrosis, especially for small-sized recurrences. Recently, radiofrequency ablation (RFA) has been suggested to be a safe and effective alternative for high-risk patients or those who refuse surgery. Nonetheless, the efficacy of RFA remains questionable for densely calcified lymph nodes, which would have an increased likelihood of leaving residues after RFA...
March 2018: Medicine (Baltimore)
Taku Yasumoto, Kenji Uemoto, Koichi Yamada, Hakketsu Koh, Masaru Yamazaki, Norihisa Masai, Daisaku Tatsumi, RyoongJin Oh
A 70's man had been treated with gemcitabine(GEM)and nab-paclitaxel(nabPTX)combination for advanced pancreatic tail cancer with splenic invasion and liver metastases. However, the primary lesion was not controlled, then intensity-modulat- ed radiation therapy(76.5 Gy/17 Fr)was performed for primary lesion. Three grown hypovascular liver metastases were detected by follow-up EOB-MRI and PET-computed tomography(CT)imaging with 18F-FDG. Unfortunately, these lesions were not detected by intravenous injection of contrast media with CT nor ultrasonography...
February 2018: Gan to Kagaku Ryoho. Cancer & Chemotherapy
Marco Calandri, Carlo Gazzera, Steven Yevich, Katia Lapenna, Maria Marenco, Andrea Veltri, Gianluca Paraluppi, Paolo Fonio
BACKGROUND: To evaluate the safety and efficacy of percutaneous ablation for HCC hepatic recurrence along surgical resection margins to achieve complete cure or bridge for additional treatment. No current recommendations exist for these lesions. METHODS: Retrospective review of post-surgical recurrent HCC located along surgical margins treated by percutaneous ultrasound-guided ablation from 2006-2014. Ablation was performed by radiofrequency ablation (RFA) or percutaneous ethanol injection (PEI), selected for recurrence in proximity to extrahepatic organs...
February 21, 2018: Minerva Chirurgica
Shun-Qian Wen, Ming Wan, Kai-Ming Len, Qiu-Hui Hu, Xue-Yi Xie, Qing Wu, Guan-Qun Liao
INTRODUCTION: Radiofrequency ablation (RFA) is an effective and minimally invasive technique for the management of hepatic hemangiomas (HHs). This study aims to assess the safety and efficacy of laparoscopic RFA for HHs. MATERIAL AND METHODS: Forty-four patients with 50 hepatic hemangiomas (5-10 cm in diameter) undergoing laparoscopic RFA from January 2012 to May 2015 at three tertiary hospitals in China were retrospectively analyzed. RESULTS: Thirty-three patients with subcapsular hemangiomas were treated with a laparoscopic approach, and 11 patients with lesions in the liver parenchyma were treated with a combined laparoscopy and an ultrasound-guided percutaneous approach...
March 1, 2018: Annals of Hepatology
Dan O'Neal, Tal Cohen, Cynthia Peterson, Richard G Barr
Although only limited long-term studies evaluating thermal ablation of renal masses have been performed, it appears that thermal ablation has a comparable 5-year success rate to that of partial or total nephrectomy. This technique is often used in patients who are not good candidates for partial or total nephrectomy. Contrast-enhanced ultrasound (CEUS) has been recently approved by the Food and Drug Administration for characterization of focal liver lesions in adults and pediatric patients. CEUS can be used off label for renal applications and has been used for years in Europe and Asia...
2018: Journal of Kidney Cancer and VHL
Michael D Staudt, Sarita Maturu, Jonathan P Miller
BACKGROUND: Radiofrequency thermocoagulation of epileptogenic foci via stereoelectroencephalography (SEEG) electrodes has been suggested as a treatment for medically intractable epilepsy, but reported outcomes have been suboptimal, possibly because lesions generated using conventional high-energy radiofrequency parameters are relatively small. OBJECTIVE: To describe a technique of delivering low energy across separate SEEG electrodes in order to create large confluent radiofrequency lesions...
February 16, 2018: Operative Neurosurgery (Hagerstown, Md.)
Roger A Winkle, Ryan Moskovitz, R Hardwin Mead, Gregory Engel, Melissa H Kong, William Fleming, Jonathan Salcedo, Rob A Patrawala, John H Tranter, Isaac Shai
PURPOSE: The optimal radiofrequency (RF) power and lesion duration using contact force (CF) sensing catheters for atrial fibrillation (AF) ablation are unknown. We evaluate 50 W RF power for very short durations using CF sensing catheters during AF ablation. METHODS: We evaluated 51 patients with paroxysmal (n = 20) or persistent (n = 31) AF undergoing initial RF ablation. RESULTS: A total of 3961 50 W RF lesions were given (average 77...
February 19, 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
Robbert S Puijk, Alette H Ruarus, Hester J Scheffer, Laurien G P H Vroomen, Aukje A J M van Tilborg, Jan J J de Vries, Ferco H Berger, Petrousjka M P van den Tol, Martijn R Meijerink
Liver tumour ablation nowadays represents a routine treatment option for patients with primary and secondary liver tumours. Radiofrequency ablation and microwave ablation are the most widely adopted methods, although novel techniques, such as irreversible electroporation, are quickly working their way up. The percutaneous approach is rapidly gaining popularity because of its minimally invasive character, low complication rate, good efficacy rate, and repeatability. However, matched to partial hepatectomy and open ablations, the issue of ablation site recurrences remains unresolved and necessitates further improvement...
February 2018: Canadian Association of Radiologists Journal, Journal L'Association Canadienne des Radiologistes
Elena Quílez-Caballero, José Martel-Villagran, Ángel Luis Bueno-Horcajadas, Laura López-Brasal, María Jesús Díaz-Candamio
Osteoblastomatosis (OBLT), also referred to as multifocal osteoblastoma (OB), is an unusual and recently described entity consisting of multifocal tumors histologically consistent with osteoblastoma and osteoid osteoma (OO) but radiologically mimicking a vascular bone lesion. OBLT treatment is based on aggressive procedures, such as amputation, en bloc resection, and chemotherapy. Only one previously reported case was successfully treated following a multimodal approach consisting of curettage, cryotherapy, intravenous bisphosphonates, and radiofrequency ablation...
February 15, 2018: Skeletal Radiology
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