207 results match your criteria bipolar rfa


EUS-guided ablation of pancreatic neoplasms.

Minerva Gastroenterol (Torino) 2021 Apr 19. Epub 2021 Apr 19.

Digestive Endoscopy Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy -

Ablative therapies for locoregional treatment of pancreatic neoplastic lesions developed over the last decade to be applied during surgery are now becoming also available to be utilized under endoscopic ultrasound (EUS) guidance. The advantage of this approach is clear because of the close proximity of the EUS transducer to the target lesion, coupled with developments of specifically designed ablation devices, making the procedure minimally invasive, and potentially sparing patients from the morbidity of this method when performed surgically. EUS-guided ablative techniques that have been applied to pancreatic neoplastic cysts, pancreatic functional and non-functional neuroendocrine neoplasms and pancreatic ductal adenocarcinoma include ethanol injection, radiofrequency ablation (RFA), a combination of bipolar RFA and cryoablation, laser therapy (LT) and photodynamic therapy (PDT). Read More

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COMBINED BIPOLAR AND V-SHAPED LESIONS FOR LUMBAR FACET RADIOFREQUENCY ABLATION: A TECHNICAL REPORT.

Pain Med 2021 Apr 8. Epub 2021 Apr 8.

Department of Pain Management, Cleveland Clinic, Cleveland, OH.

Introduction: Radiofrequency ablation (RFA) is a demonstrated safe and effective treatment for chronic low back pain. RFA delivers high density electrical current near lumbar medial branch nerve. The success of RFA is contingent upon creating a lesion that overlaps the sensory nerve supplying the affected facet joint(s). Read More

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Percutaneous bipolar radiofrequency ablation for spine metastatic lesions.

Eur J Orthop Surg Traumatol 2021 Mar 30. Epub 2021 Mar 30.

2nd Department of Radiology, Medical School, University General Hospital "ATTIKON", National and Kapodistrian University of Athens, 1 Rimini str, 12462, Athens, Greece.

Purpose: The purpose of this review is to become familiar with the most common indications for imaging guided percutaneous bipolar radiofrequency ablation, to learn about different technical considerations during performance providing the current evidence. Controversies concerning products will be addressed.

Methods: We performed a literature review excluding non-English studies and case reports. Read More

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Simplicity Radiofrequency Ablation Demonstrates Greater Functional Improvement Than Analgesia: A Prospective Case Series.

Pain Physician 2021 Mar;24(2):E185-E190

Department of Anesthesiology, UT Health San Antonio, San Antonio, TX.

Background: Pain originating from the posterior sacroiliac complex is notoriously difficult to effectively treat due to its complex anatomy and variable innervation. Data on radiofrequency ablation (RFA) is limited. The Abbott Simplicity probe creates 3 monopolar lesions along the medial aspect of the sacroiliac joint and 2 bipolar lesions between the active portions of the probe. Read More

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Review of the Safety of Bipolar Radiofrequency Ablation in Patients with Chronic Pain with Implantable Cardiac Rhythm Management Devices.

Pain Physician 2021 Mar;24(2):E169-E176

Department of Anesthesiology University of Wisconsin, School of Medicine and Public Health, Madison, WI.

Background: Chronic pain, especially low back pain and hip pain, has been a growing public health concern that affects over 100 million Americans annually. Radiofrequency ablation (RFA) has distinct advantages over other chronic pain management modalities and its use has been increasing over the past decade. Among the growing population with comorbid conduction disorders and persistent pain, RFA and its potential interference with implantable cardiac devices is of concern. Read More

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Imaging-guided radiofrequency ablation of osteoid osteoma in typical and atypical sites: Long term follow up.

PLoS One 2021 18;16(3):e0248589. Epub 2021 Mar 18.

Radiologia Interventistica, Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale", Napoli (IT), Naples, Italy.

Purpose: To assess efficacy and safety of imaging-guided radiofrequency ablation (RFA) of Osteoid Osteoma (OO) in both typical and atypical sites.

Methods And Materials: Between January 2014 and March 2019, 102 consecutive percutaneous RFA were performed and retrospectively reviewed. The procedures were performed using a RFA bipolar ablation system (Covidien, exposed tip of 0. Read More

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Bipolar radiofrequency ablation treatment of liver cancer employing monopolar needles: A comprehensive investigation on the efficacy of time-based switching.

Comput Biol Med 2021 Apr 16;131:104273. Epub 2021 Feb 16.

School of Engineering and Information Technology, Faculty of Science and Technology, Federation University, VIC, 3350, Australia.

Radiofrequency ablation (RFA) is a thermal ablative treatment method that is commonly used to treat liver cancer. However, the thermal coagulation zone generated using the conventional RFA system can only successfully treat tumours up to 3 cm in diameter. Switching bipolar RFA has been proposed as a way to increase the thermal coagulation zone. Read More

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What is the difference in ablation zone of multi-bipolar radiofrequency ablation between liver cirrhosis and normal liver background? - a prospective clinical study.

Int J Hyperthermia 2020 ;37(1):1248-1259

Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Ultrasound, Peking University Cancer Hospital and Institute, Beijing, China.

Purpose: To explore the differences in ablation zone between liver cirrhosis and normal liver background and investigate the effect of hepatic blood flow on ablation zone of RFA.

Methods: Between 2017 and 2019, 203 patients who had liver malignancies and underwent percutaneous RFA with Celon bipolar electrodes enrolled into this study. There were 90 patients had liver cirrhosis and 113 patients had normal liver background. Read More

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January 2020

Long-term Survival Results following Endobronchial RF Ablation in a Healthy-Porcine Model.

Annu Int Conf IEEE Eng Med Biol Soc 2020 07;2020:5252-5258

This paper presents results from long-term survival study where healthy swine were ablated with a novel technology designed for treating early-stage non-small cell lung cancer using an endobronchial flexible catheter.Methods - The radiofrequency ablation (RFA) system has been presented previously and consisted of an ablation catheter, radiofrequency generator, irrigation pump for infusion of hypertonic saline (HS) and a laptop. The catheter carried an occlusion balloon, a 5 mm long RF electrode, with irrigation holes, and a 1 mm long electrode for bipolar impedance measurements. Read More

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Radiofrequency ablation using internally cooled wet electrodes in bipolar mode for the treatment of recurrent hepatocellular carcinoma after locoregional treatment: A randomized prospective comparative study.

PLoS One 2020 28;15(9):e0239733. Epub 2020 Sep 28.

Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.

Objective: This study aimed to compare the efficacy between bipolar radiofrequency ablation (RFA), using twin internally cooled wet (TICW) electrodes, and switching monopolar RFA, using separable clustered (SC) electrodes, in the treatment of recurrent hepatocellular carcinoma (HCC) after locoregional treatment.

Materials And Methods: In this single-center, two-arm, parallel-group, randomized controlled study, we performed a 1:1 random allocation on eligible patients with recurrent HCC after locoregional treatment, to receive TICW-RFA or SC-RFA. The primary endpoint was the minimum diameter of the ablation zone per unit ablation time. Read More

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November 2020

Selective fetal reduction in complicated monochorionic twin pregnancies: A comparison of techniques.

Prenat Diagn 2021 01 30;41(1):52-60. Epub 2020 Sep 30.

Ontario Fetal Centre, Fetal Medicine Unit, Dept. Obstetrics & Gynaecology, Mount Sinai Hospital, Toronto, Ontario, Canada.

Objective: To compare perinatal outcomes associated with three methods of selective reduction in complicated monochorionic (MC) twin pregnancies: bipolar cord coagulation (BC), fetoscopic or ultrasound guided laser cord occlusion and radiofrequency ablation (RFA).

Methods: Retrospective cohort study of complicated MC twin pregnancies undergoing selective fetal reduction at a tertiary fetal center over a 20-year period. Obstetric and perinatal outcomes were compared. Read More

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January 2021

The Efficacy and Therapeutic Outcome of Bipolar Radiofrequency Ablation for the Treatment for Hepatocellular Carcinoma in the Real-World Setting, Compared with Monopolar Radiofrequency Ablation Conducted during the Same Period.

Oncology 2020 14;98(12):859-868. Epub 2020 Aug 14.

Department of Gastroenterology, Faculty of Medicine, Fukuoka University, Fukuoka, Japan.

Background: Several reports have suggested that the bipolar radiofrequency ablation (RFA) system is useful for the treatment of hepatocellular carcinoma (HCC). We evaluated the efficacy and safety of the bipolar RFA system for HCC treatment in the real-world setting.

Methods: A total of 155 patients with 224 HCC tumors were enrolled. Read More

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December 2020

Bipolar radiofrequency ablation for ventricular tachycardias originating from the interventricular septum: Safety and efficacy in a pilot cohort study.

Heart Rhythm 2020 12 26;17(12):2111-2118. Epub 2020 Jun 26.

Department of Arrhythmology and Cardiac Electrophysiology, IRCCS San Raffaele Scientific Institute, Milan, Italy.

Background: Interest has grown in recent years in bipolar radiofrequency ablation (B-RFA). However, indications and outcome in patients with ventricular tachycardia (VT) are still to be defined.

Objective: The purpose of this study was to describe patient selection, safety and effectiveness of B-RFA, in a pilot cohort study of patients with nonischemic dilated cardiomyopathy (NIDCM) and drug-refractory VT. Read More

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December 2020

Radiofrequency ablation with four electrodes as a building block for matrix radiofrequency ablation: Ex vivo liver experiments and finite element method modelling. Influence of electric and activation mode on coagulation size and geometry.

Surg Oncol 2020 Jun 10;33:145-157. Epub 2020 Feb 10.

Department of Radiology, Gasthuisberg University Hospital, Herestraat 49, 3000, Leuven, Belgium. Electronic address:

Purpose: Radiofrequency ablation (RFA) is increasingly being used to treat unresectable liver tumors. Complete ablation of the tumor and a safety margin is necessary to prevent local recurrence. With current electrodes, size and shape of the ablation zone are highly variable leading to unsatisfactory local recurrence rates, especially for tumors >3 cm. Read More

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Thermal and thermal damage responses during switching bipolar radiofrequency ablation employing bipolar needles: A computational study on the effects of different electrode configuration, input voltage and ablation duration.

Int J Numer Method Biomed Eng 2020 09 22;36(9):e3374. Epub 2020 Jun 22.

School of Engineering and Information Technology, Faculty of Science and Technology, Federation University, Ballarat, Victoria, Australia.

Recent studies have demonstrated the effectiveness of switching bipolar radiofrequency ablation (bRFA) in treating liver cancer. Nevertheless, the clinical use of the treatment remains less common than conventional monopolar RFA - likely due to the lack of understanding of how the tissues respond thermally to the switching effect. The problem is exacerbated by the numerous possible switching combinations when bRFA is performed using bipolar needles, thus making theoretical deduction and experimental studies difficult. Read More

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September 2020

Spinal metastases treated with bipolar radiofrequency ablation with increased (>70°C) target temperature: Pain management and local tumor control.

Diagn Interv Imaging 2021 Jan 29;102(1):27-34. Epub 2020 May 29.

Department of Interventional Radiology, Nouvel Hôpital Civil, Hopitaux Universitaires de Strasbourg, 67096 Strasbourg, France.

Purpose: To investigate the safety and clinical efficacy of bipolar radiofrequency ablation (b-RFA) with increased (>70°C) target temperature for the treatment of spine metastases with the intent of achieving pain relief or local tumor control.

Materials And Methods: Thirty-one patients with a total of 37 metastases who were treated with b-RFA with increased temperature and vertebroplasty from January 2016 to May 2019 were retrospectively included. There were 20 women and 11 men with a mean age of 62. Read More

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January 2021

Complications after Radiofrequency Ablation for Hepatocellular Carcinoma: A Multicenter Study Involving 9,411 Japanese Patients.

Liver Cancer 2020 Jan 22;9(1):50-62. Epub 2019 Oct 22.

bDepartment of Oncology and Laboratory, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan.

Introduction: Radiofrequency ablation (RFA) for hepatocellular carcinoma (HCC) is considered a safe and minimally invasive procedure. We previously reported that the mortality and complication rates for RFA were 0.038% (5/13,283 patients) and 3. Read More

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January 2020

Endobronchial Ultrasound-Guided Radiofrequency Ablation of Lung Tumors and Mediastinal Lymph Nodes: A Preclinical Study in Animal Lung Tumor and Mediastinal Adenopathy Models.

Semin Thorac Cardiovasc Surg 2020 Autumn;32(3):570-578. Epub 2020 Feb 10.

Division of Thoracic Surgery, Toronto General Hospital, University Health Network, Toronto, Ontario, Canada; TECHNA Institute for the Advancement of Technology for Health, University Health Network, Toronto, Ontario, Canada.

Radiofrequency ablation (RFA) can be a therapeutic option in medically inoperable lung cancer patients. In this study, we evaluated a prototype bipolar RFA device applicator that can be deployed from a standard endobronchial ultrasound (EBUS) bronchoscope to determine feasibility and histopathological analysis in animal models. Rabbit lung cancers were created by transbronchial injection of VX2 rabbit cancer cells. Read More

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October 2020

Impact of epicardial adipose tissue and catheter ablation strategy on biophysical parameters and ablation lesion characteristics.

J Cardiovasc Electrophysiol 2020 05 18;31(5):1114-1124. Epub 2020 Feb 18.

Section of Cardiac Electrophysiology, Division of Cardiology, Stanford University, Palo Alto, California.

Background: Epicardial adipose (EA) tissue may limit effective radiofrequency ablation (RFA).

Objectives: We sought to evaluate the lesion formation of different ablation strategies on ventricular myocardium with overlying EA.

Methods: Bovine myocardium with EA was placed in a circulating saline bath in an ex vivo model. Read More

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A numerical study on the no-touch bipolar radiofrequency ablation

Annu Int Conf IEEE Eng Med Biol Soc 2019 Jul;2019:2887-2890

The commonly used radiofrequency ablation (RFA) technique for treating liver cancer is in the monopolar mode. This requires the insertion of the RF electrode directly into the tumor tissue, which increases the risks of tumor track seeding (TTS). One way to overcome TTS is by employing the bipolar RFA, implemented in the no-touch mode. Read More

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Early Preclinical Experience with a Novel Endobronchial Radiofrequency Ablation System for Lung Cancer Treatment.

Annu Int Conf IEEE Eng Med Biol Soc 2019 Jul;2019:174-180

This paper introduces a novel technology for treating early-stage non-small cell lung cancer using an endobronchial approach via a flexible radiofrequency ablation (RFA) catheter. Methods - The RFA system consisted of an ablation catheter, radiofrequency generator, irrigation pump for infusion of hypertonic saline (HS) and a laptop. The catheter carried an occlusion balloon, a 5 mm long RF electrode, with irrigation holes, and a 1 mm long electrode for bipolar impedance measurements. Read More

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Lack of awareness among surgeons regarding safe use of electrosurgery. A cross sectional survey of surgeons in Pakistan.

Ann Med Surg (Lond) 2020 Feb 30;50:24-27. Epub 2019 Nov 30.

Shaukat Khanum Memorial Cancer Hospital, Pakistan.

Objective: To assess our surgeons perceptive regarding the safe usage of electrosurgical devices.

Method: ology: This cross sectional survey was carried out at two hospitals, A cancer hospital and a public sector general hospital. Consultants, fellows and senior residents (Resident year 3rd and year 4th) on the surgical floor were requested to fill up the questionnaire. Read More

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February 2020

Peri-procedural Management of Implanted Spinal Cord Stimulators in Patients Undergoing Radiofrequency Ablation: A Case Report and Manufacturer-Specific Recommendations.

Pain Pract 2020 04 15;20(4):405-411. Epub 2019 Dec 15.

Department of Anesthesiology, Division of Pain Medicine, Mayo Clinic, Rochester, Minnesota, U.S.A.

Introduction: Radiofrequency ablation (RFA) and spinal cord stimulation (SCS) are 2 common modalities used in management of various pain conditions. RFA generates heat and an electromagnetic field that can theoretically interfere with the functionality and longevity of the SCS device. This is problematic for patients who need RFA and have previously undergone implantation of an SCS device. Read More

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Bipolar catheter ablation in ventricular myocardium.

Pacing Clin Electrophysiol 2020 01 23;43(1):54-61. Epub 2019 Dec 23.

Department of Cardiology, National University Heart Centre, Singapore.

Background: Recurrence rates after catheter radiofrequency ablation (RFA) for arrhythmias arising from deep myocardial substrates can exceed 40%. Failure of RFA is in part due to the inability of widely used unipolar ablation (UA) to create transmural lesions capable of disrupting the critical components of the arrhythmia circuit. A radiofrequency generator was custom-made to deliver bipolar ablation (BA) to test the hypothesis that BA is more effective compared to UA in achieving transmurality and to determine the optimal configuration for ventricular BA. Read More

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January 2020

No-Touch Multi-bipolar Radiofrequency Ablation for the Treatment of Subcapsular Hepatocellular Carcinoma ≤ 5 cm Not Puncturable via the Non-tumorous Liver Parenchyma.

Cardiovasc Intervent Radiol 2020 Feb 31;43(2):273-283. Epub 2019 Oct 31.

Radiology Department, Hôpital Jean Verdier (APHP), Hôpitaux universitaires Paris-Seine-Saint-Denis, Assistfance Publique Hôpitaux de Paris, Avenue du 14 juillet, 93140, Bondy, France.

Purpose: The percutaneous ablation of subcapsular hepatocellular carcinoma (S-HCC) may involve a risk of complications such as hemorrhage and tumor seeding, mainly linked to the direct tumor puncture often inevitable with mono-applicator ablation devices. The purpose of this study was to assess the efficacy and safety of no-touch multi-bipolar radiofrequency ablation (NTMBP-RFA) for the treatment of S-HCC ≤ 5 cm not puncturable via the non-tumorous liver parenchyma.

Materials And Methods: Between September 2007 and December 2014, 58 consecutive patients (median age: 63 years [46-86], nine females) with 59 S-HCC ≤ 5 cm (median diameter: 25 mm [10-50 mm]), not puncturable via the non-tumorous liver parenchyma, were treated with NTMBP-RFA. Read More

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February 2020

Comparison of ultrasound results following endovenous laser ablation and radiofrequency ablation in the treatment of varicose veins.

Ann Ital Chir 2019 ;90:457-462

Purpose: Superficial venous insufficiency is a common problem associated with varicose veins. In addition to classical symptoms, it may result in skin changes, venous ulcers and has a great impact on patients' health-related quality of life. In the last decade, minimally invasive techniques such as endovenous laser ablation (EVLA) and radiofrequency ablation (RFA) have been developed as alternatives to surgery in an attempt to reduce morbidity and improve efficiency. Read More

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A Novel Method to Increase Tumor Ablation Zones With RFA by Injecting the Cationic Polymer Solution to Tissues: In Vivo and Computational Studies.

IEEE Trans Biomed Eng 2020 06 15;67(6):1787-1796. Epub 2019 Oct 15.

Objective: This study aims to examine, for the first time, the introduction of cationic polymer solutions to improve radiofrequency ablation (RFA) in terms of a potentially enlarged ablation zone.

Methods: By using in vivo and computational RFA studies, two cationic polymers, Chitooligosaccharides (COS) and carboxymethyl chitosan (CMC), diluted in deionized water, were injected into tissues separately surrounding the RF bipolar electrode prior to power application. A total of 9 rabbits were used to 1) measure the increase in electrical conductivity of tissues injected with the cationic polymer solutions, and 2) explore the enhancement of the ablation performance in RFA trials. Read More

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Bipolar radiofrequency ablation creates different lesion characteristics compared to simultaneous unipolar ablation.

J Cardiovasc Electrophysiol 2019 12 13;30(12):2960-2967. Epub 2019 Oct 13.

Section of Cardiac Electrophysiology, Division of Cardiology, Brigham and Women's Hospital, Boston, Massachusetts.

Introduction: Both bipolar and simultaneous radiofrequency ablation (bRFA, simRFA) have been used to treat thick midmyocardial substrate as well as during circular, multipolar ablation between shorter distances.

Objectives: We sought to evaluate the biophysical parameters of simRFA, sequential unipolar RFA (seqRFA), and bRFA.

Methods: Bovine myocardium was placed in a circulating saline bath. Read More

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December 2019

Initial Experience of ERCP-Guided Radiofrequency Ablation as the Primary Therapy for Inoperable Ampullary Carcinomas.

Dig Dis Sci 2020 05 27;65(5):1453-1459. Epub 2019 Sep 27.

Department of Gastroenterology and Endoscopy, Eastern Hepatobiliary Hospital, Second Military Medical University, Shanghai, 200438, China.

Background: Endoscopic ablation of duodenal ampullary malignancy has not been fully assessed.

Aims: The study aimed to evaluate the efficacy and safety of Endoscopic retrograde cholangiopancreatograpy (ERCP)-guided radiofrequency ablation (RFA) for inoperable ampullary cancer.

Methods: Patients with inoperable ampullary cancer underwent ERCP-guided RFA from January 2012 to August 2017. Read More

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Spinal Radiofrequency Ablation Combined with Cement Augmentation for Painful Spinal Vertebral Metastasis: A Single-Center Prospective Study.

Pain Physician 2019 09;22(5):E441-E449

University of Kansas Medical Center, Kansas City, KS.

Background: The spine is the most common site of skeletal metastatic disease. Vertebral body metastases (VBM) can cause crippling pain, fractures, and spinal cord compression. Radiofrequency ablation (RFA) is a minimally invasive technique that has proven to be a safe method of targeted tissue destruction. Read More

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September 2019