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RF ablation

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https://www.readbyqxmd.com/read/28315135/repeat-procedures-using-the-second-generation-cryoballoon-for-recurrence-of-atrial-fibrillation-after-initial-ablation-with-conventional-radiofrequency
#1
Valentina De Regibus, Saverio Iacopino, Juan-Pablo Abugattas, Giacomo Mugnai, Darragh Moran, Erwin Ströker, Hugo-Enrique Coutino, Ken Takarada, Rajin Choudhury, Gaetano Paparella, Vincent Umbrain, Pedro Brugada, Carlo de Asmundis, Gian-Battista Chierchia
PURPOSE: Pulmonary vein isolation is now widely accepted for the treatment of symptomatic atrial fibrillation refractory to antiarrhythmic drugs. However, multiple procedures are often required to significantly reduce atrial fibrillation (AF) recurrence. In the present study, we analyzed the acute results and the midterm clinical outcome of a second-generation cryoballoon ablation (CB-A) performed during repeat procedures for recurrence of AF after an initial procedure performed with conventional radiofrequency (RF)...
March 17, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28294951/evaluation-of-local-tumor-residue-after-percutaneous-radiofrequency-ablation-therapy-for-hepatocellular-carcinoma
#2
Jun Hamanaka, Tohru Goto, Shuhei Nishigori, Shihoko Seki, Tomonori Ida, Taiki Morohashi, Hiroshi Ohara, Masahiko Inamori, Shin Maeda
BACKGROUND/AIMS: This study's purpose was to compare the efficacy of CO2-enhanced ultrasonography (US) with that of Sonazoid-enhanced US and conventional US in detecting local tumor residue after percutaneous radiofrequency (RF) ablation therapy for hepatocellular carcinoma. MATERIALS AND METHODS: Between February 2009 and March 2010, 141 lesions of 121 hepatocellular carcinoma patients were treated by percutaneous RF ablation, and 22 tumor residues were detected in 22 patients by contrast-enhanced computed tomography...
March 15, 2017: Turkish Journal of Gastroenterology: the Official Journal of Turkish Society of Gastroenterology
https://www.readbyqxmd.com/read/28268553/rf-induced-energy-for-partially-implanted-catheters-a-computational-study
#3
Elena Lucano, Micaela Liberti, Tom Lloyd, Francesca Apollonio, Steve Wedan, Wolfgang Kainz, Leonardo M Angelone
Magnetic Resonance Imaging (MRI) is a radiological imaging technique widely used in clinical practice. MRI has been proposed to guide the catheters for interventional procedures, such as cardiac ablation. However, there are risks associated with this procedure, such as RF-induced heating of tissue near the catheters. The aim of this study is to develop a quantitative RF-safety method for patients with partially implanted leads at 64 MHz. RF-induced heating is related to the electric field incident along the catheter, which in turns depends on several variables, including the position of the RF feeding sources and the orientation of the polarization, which are however often unknown...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268057/renal-sympathetic-denervation-system-via-intraluminal-ultrasonic-ablation-therapeutic-intravascular-ultrasound-design-and-preclinical-evaluation
#4
Gil Chernin, Iris Szwarcfiter, Yvonne Bausback, Michael Jonas
PURPOSE: To assess the safety and performance of a nonfocused and nonballooned ultrasonic (US) catheter-based renal sympathetic denervation (RDN) system in normotensive swine. MATERIALS AND METHODS: RDN with the therapeutic intravascular US catheter was evaluated in 3 experiments: (i) therapeutic intravascular US RDN vs a control group of untreated animals with follow-up of 30, 45, and 90 days (n = 6; n = 12 renal arteries for each group); (ii) therapeutic intravascular US RDN vs radiofrequency (RF) RDN in the contralateral artery in the same animal (n = 2; n = 4 renal arteries); and (iii) therapeutic intravascular US RDN in a recently stent-implanted renal artery (n = 2; n = 4 renal arteries)...
March 3, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28265782/predictors-of-acute-inefficacy-and-the-radiofrequency-energy-time-required-for-cavotricuspid-isthmus-dependent-atrial-flutter-ablation
#5
Jordi Pérez-Rodon, Julian Rodriguez-García, Axel Sarrias-Merce, Nuria Rivas-Gandara, Ivo Roca-Luque, Jaume Francisco-Pascual, Alba Santos-Ortega, Gabriel Martín-Sánchez, Ignacio Ferreira-González, Jose Rodríguez-Palomares, Artur Evangelista-Masip, David García-Dorado, Àngel Moya-Mitjans
PURPOSE: Although cavotricuspid isthmus-dependent atrial flutter (CTI-AFL) ablation is a highly efficacious treatment, a bidirectional CTI block cannot be achieved in some patients. In this study, we sought to determine the predictors of acute inefficacy of CTI-AFL ablation and the predictors of the radiofrequency (RF) energy time required to achieve a complete bidirectional CTI block. METHODS: All consecutive patients who underwent stand-alone CTI-AFL ablation in our institution, except patients with congenital heart disease, were included in this retrospective study...
March 6, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28256158/treatment-outcomes-and-patterns-of-radiologic-appearance-after-hypofractionated-image-guided-radiotherapy-delivered-with-helical-tomotherapy-hht-for-lung-tumours
#6
Stefano Arcangeli, Lorenzo Falcinelli, Stefano Bracci, Alessandro Greco, Alessia Monaco, Jessica Dognini, Cinzia Chiostrini, Rita Bellavita, Cynthia Aristei, Vittorio Donato
OBJECTIVE: To evaluate treatment outcomes and patterns of CT lung injury after hypofractionated image-guided radiotherapy delivered with helical tomotherapy (HHT) in a series of inoperable lung lesions. METHODS: 68 patients who were medically inoperable (69 lesions) without evidence of viable extrathoracic disease were included. Dose prescription was driven by tumour location (hilar/pericentral vs peripheral) and/or target volume. 52% of the lesions received a biological equivalent dose (BED10) ≥100 Gy...
March 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28249543/initial-single-center-experience-radiofrequency-ablation-assisted-vertebroplasty-and-osteoplasty-using-a-bipolar-device-in-the-palliation-of-bone-metastases
#7
Elizabeth David, Sagi Kaduri, Albert Yee, Edward Chow, Arjun Sahgal, Stephanie Chan, Ramez Hanna
BACKGROUND: To assess the safety and clinical outcomes of bipolar radiofrequency ablation (RFA) assisted vertebroplasty (VP) and osteoplasty (OP) in pathological and insufficiency fractures. The insufficiency fractures were in patients who sustained demineralization secondary to cancer treatment. METHODS: Patients referred for symptomatic malignant or insufficiency fractures for VP or OP from January 2011 to May 2015 were retrospectively reviewed. Bipolar RFA was performed (Osteocool RF ablation system, Baylis Medical) reaching a constant temperature of 70 ℃ over 7 to 15 minutes followed by cement injection...
January 16, 2017: Annals of Palliative Medicine
https://www.readbyqxmd.com/read/28238239/ablation-of-macro-re-entrant-atrial-arrhythmia-late-after-surgical-aortic-valve-replacement
#8
Michał Orczykowski, Paweł Derejko, Piotr Urbanek, Robert Bodalski, Katarzyna Kodziszewska, Radosław Sierpiński, Rafał Baranowski, Maria Bilińska, Łukasz Szumowski
BACKGROUND: Re-entrant atrial arrhythmias are common in patients after cardiac surgery. To date, however, no studies have reported the safety and efficacy of radiofrequency (RF) ablation of macro-re-entrant atrial arrhythmias in a unique, homogeneous group of patients after surgical replacement of the aortic valve and single right atriotomy. METHODS: Among over 4,000 RF catheter ablations performed at the authors' center between 2008 and 2014, eight patients (seven males, one female; mean age 55...
September 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28226730/rf-induced-energy-for-partially-implanted-catheters-a-computational-study
#9
Elena Lucano, Micaela Liberti, Tom Lloyd, Francesca Apollonio, Steve Wedan, Wolfgang Kainz, Leonardo M Angelone, Elena Lucano, Micaela Liberti, Tom Lloyd, Francesca Apollonio, Steve Wedan, Wolfgang Kainz, Leonardo M Angelone, Elena Lucano, Leonardo M Angelone, Tom Lloyd, Steve Wedan, Francesca Apollonio, Wolfgang Kainz, Micaela Liberti
Magnetic Resonance Imaging (MRI) is a radiological imaging technique widely used in clinical practice. MRI has been proposed to guide the catheters for interventional procedures, such as cardiac ablation. However, there are risks associated with this procedure, such as RF-induced heating of tissue near the catheters. The aim of this study is to develop a quantitative RF-safety method for patients with partially implanted leads at 64 MHz. RF-induced heating is related to the electric field incident along the catheter, which in turns depends on several variables, including the position of the RF feeding sources and the orientation of the polarization, which are however often unknown...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28220602/mexametric-and-cutometric-assessment-of-the-signs-of-aging-of-the-skin-area-around-the-eyes-after-the-use-of-non-ablative-fractional-laser-non-ablative-radiofrequency-and-intense-pulsed-light
#10
Anna Maria Kołodziejczak, Helena Rotsztejn
The assessment of the signs of aging within eyes area in cutometric (skin elasticity) and mexametric (discoloration and severity of erythema) examination after the treatment with: non-ablative fractional laser, non-ablative radiofrequency (RF) and intense light source (IPL). This study included 71 patients, aged 33-63 years (the average age was 45.81) with Fitzpatrick skin type II and III. 24 patients received 5 successive treatment sessions with a 1,410-nm non-ablative fractional laser in two-week intervals, 23 patients received 5 successive treatment sessions with a non-ablative RF in one-week intervals and 24 patients received 5 successive treatment sessions with an IPL in two-week intervals...
February 21, 2017: Dermatologic Therapy
https://www.readbyqxmd.com/read/28202257/radiofrequency-catheter-ablation-of-atrioventricular-node-reentrant-tachycardia-in-children-with-limited-fluoroscopy
#11
Moshe Swissa, Einat Birk, Tamir Dagan, Sody Abby Naimer, Michal Fogelman, Tom Einbinder, Elchanan Bruckheimer, Rami Fogelman
BACKGROUND: Limited fluoroscopy cryo-ablation using a 3D electro-anatomical system (3DS) has been used for AVNRT in children. We aimed to facilitate a fluoroscopy limited approach of RF ablation of AVNRT in children. METHODS: A retrospective study was performed of procedure parameters in children undergoing RF ablation of AVNRT in 75 consecutive children (June 2011 to November 2013 - Group A) using standard fluoroscopy techniques compared to those of 64 consecutive children (December 2013 to May 2015 - Group B), using a fluoroscopy limited approach with 3DS...
January 31, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28190945/mems-based-flexible-force-sensor-for-tri-axial-catheter-contact-force-measurement
#12
Hardik J Pandya, Jun Sheng, Jaydev P Desai
Atrial fibrillation (AFib) is a significant healthcare problem caused by the uneven and rapid discharge of electrical signals from pulmonary veins (PVs). The technique of radiofrequency (RF) ablation can block these abnormal electrical signals by ablating myocardial sleeves inside PVs. Catheter contact force measurement during RF ablation can reduce the rate of AFib recurrence, since it helps to determine effective contact of the catheter with the tissue, thereby resulting in effective power delivery for ablation...
February 2017: Journal of Microelectromechanical Systems
https://www.readbyqxmd.com/read/28185360/effect-of-environmental-impedance-surrounding-a-radiofrequency-ablation-catheter-electrode-on-lesion-characteristics
#13
Duy T Nguyen, Kianna Nguyen, Lijun Zheng, Joseph Schuller, Matthew Zipse, Wendy S Tzou, William H Sauer
INTRODUCTION: The electrical conductivity of the environment surrounding a catheter electrode may affect radiofrequency (RF) current. A higher impedance environment enveloping a catheter tip can be insulating and thus direct RF preferentially into targeted cardiac tissue. We sought to evaluate whether different environmental impedances will affect RF lesions. METHODS: An ex vivo model using bovine myocardium, load cell, and 4 mm ablation catheter was tested using a circulating bath of normal (0...
February 10, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28167089/alternative-approaches-for-ablation-of-resistant-ventricular-tachycardia
#14
REVIEW
Carola Gianni, Sanghamitra Mohanty, Chintan Trivedi, Luigi Di Biase, Amin Al-Ahmad, Andrea Natale, J David Burkhardt
Ventricular tachycardia (VT) ablation is usually performed with an ablation catheter that delivers unipolar radiofrequency (RF) energy to eliminate the re-entry circuit responsible for VT. However, there are some instances when unipolar RF ablation fails, notably in VTs with a deep intramural origin, or cases in which epicardial access is not attainable due to prior cardiac surgery. To overcome these limitations, several alternative approaches have been used in clinical practice, including alcohol ablation or coil embolization, simultaneous unipolar or bipolar RF ablation, surgical ablation, or noninvasive ablation with stereotactic radiosurgery...
March 2017: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/28163454/comparative-study-to-evaluate-the-efficacy-of-radiofrequency-ablation-versus-trichloroacetic-acid-in-the-treatment-of-xanthelasma-palpebrarum
#15
Praveen Kumar Shanmugam Reddy, Sumathy Tharayil Kunneth, Shyam Prasad Arakali Lakshminarayana, Suparna Madivalara Yallappa, Ranganathan Chandrashekara, Shivaswamy Kanakapura Nanjundaswamy
BACKGROUND: Xanthelasma palpebrarum (XP) is a metabolic disorder involving the eyelids. Radiofrequency(RF) surgery and trichloroacetic acid (TCA) applications have been listed among the procedures for XP, but comparative studies are not available. AIM: To compare the efficacy of radiofrequency surgery versus trichloroacetic acid application in the treatment of XP. SETTINGS AND DESIGN: 20 consecutive cases of XP attending dermatology, medicine and endocrinology out-patient departments of M...
October 2016: Journal of Cutaneous and Aesthetic Surgery
https://www.readbyqxmd.com/read/28153795/relationship-between-lesion-formation-and-electrophysiological-responses-using-catheters-equipped-with-mini-electrodes-in-chronic-atrial-fibrillation
#16
Boaz Avitall, Arthur Kalinski, Piotr Horbal, Josef Koblish
BACKGROUND: The study focuses on the electrophysiological changes associated with lesion formation using 4.5-mm irrigated and 8-mm standard catheters equipped with mini-electrodes (MEs) positioned circumferentially on the tip. OBJECTIVE: The aim of the study was to test the relationship between the maximal electrogram (EGM) reduction, frequency spectrum shift, and their impact on atrial lesion formation in the atrial fibrillation (AF) model. Furthermore, we hypothesize that the high fidelity recording from the MEs allows improved discrimination of ablated tissues from nonablated tissues...
January 31, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28146314/how-coagulation-zone-size-is-underestimated-in-computer-modeling-of-rf-ablation-by-ignoring-the-cooling-phase-just-after-rf-power-is-switched-off
#17
Ramiro M Irastorza, Macarena Trujillo, Enrique Berjano
All the numerical models developed for radiofrequency (RF) ablation so far have ignored the possible effect of the cooling phase (just after RF power is switched off) on the dimensions of the coagulation zone. Our objective was thus to quantify the differences in the minor radius of the coagulation zone computed by including and ignoring the cooling phase. We built models of RF tumor ablation with two needle-like electrodes: a dry electrode (5 mm long and 17G in diameter) with a constant temperature protocol (70 °C) and a cooled electrode (30 mm long and 17G in diameter) with a protocol of impedance control...
February 1, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28144262/staged-hybrid-ablation-for-persistent-and-longstanding-persistent-atrial-fibrillation-effectively-restores-sinus-rhythm-in-long-term-observation
#18
Michal Zembala, Krzysztof Filipiak, Oskar Kowalski, Piotr Buchta, Tomasz Niklewski, Pawel Nadziakiewicz, Rafał Koba, Mariusz Gąsior, Zbigniew Kalarus, Marian Zembala
INTRODUCTION: Hybrid ablation (HABL) of atrial fibrillation combining endoscopic, minimally invasive, closed chest epicardial ablation with endocardial CARTO-guided accuracy was introduced to overcome the limitations of current therapeutic options for patients with persistent (PSAF) and longstanding persistent atrial fibrillation (LSPAF). The purpose of this study was to evaluate the procedural safety and feasibility as well as effectiveness of HABL in patients with PSAF and LSPAF 1 year after the procedure...
February 1, 2017: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/28139942/chronological-changes-of-radiofrequency-ablation-zone-in-rabbit-liver-an-in-vivo-correlation-between-gross-pathology-and-histopathology
#19
Kyoung Doo Song, Min Woo Lee, Hyunchul Rhim, Tae Wook Kang, Dong Ik Cha, Jehoon Yang
OBJECTIVES: To examine the gross pathology and histopathology of ablation zones created from radiofrequency (RF) ablation and correlate their chronological changes. METHODS: A total of forty-eight in vivo ablation zones (16 rabbit livers) were obtained immediately after and also 30 minutes, 1 hour, and 2 hours after RF ablation and subjected to hematoxylin and eosin (H&E) staining, nicotinamide adenine dinucleotide (NADH) diaphorase staining, terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) staining...
January 31, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28114851/theoretical-and-experimental-analysis-of-amplitude-control-ablation-and-bipolar-ablation-in-creating-linear-lesion-and-discrete-lesions-for-treating-atrial-fibrillation
#20
Shengjie Yan, Xiaomei Wu, Weiqi Wang
PURPOSE: Radiofrequency (RF) energy is often used to create a linear lesion or discrete lesions for blocking the accessory conduction pathways for treating atrial fibrillation. By using finite element analysis, we study the ablation effect of amplitude control ablation mode (AcM) and bipolar ablation mode (BiM) in creating a linear lesion and discrete lesions in a 5-mm-thick atrial wall; particularly, the characteristic of lesion shape has been investigated in amplitude control ablation...
January 23, 2017: International Journal of Hyperthermia
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