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https://www.readbyqxmd.com/read/29772927/design-and-simulation-of-novel-laparoscopic-renal-denervation-system-a-feasibility-study
#1
Eunbi Ye, Jinhwan Baik, Seunghyun Lee, Seon Young Ryu, Sunchoel Yang, Eue-Keun Choi, Won Hoon Song, Hyeong Dong Yuk, Chang Wook Jeong, Sung-Min Park
PURPOSE: In this study, we propose a novel laparoscopy-based renal denervation (RDN) system for treating patients with resistant hypertension. In this feasibility study, we investigated whether our proposed surgical instrument can ablate renal nerves from outside of the renal artery safely and effectively and can overcome the depth-related limitations of the previous catheter-based system with less damage to the arterial walls. METHOD: We designed a looped bipolar electrosurgical instrument to be used with laparoscopy-based RDN system...
May 18, 2018: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29764244/kinetics-and-tissue-repair-process-following-fractional-bipolar-radiofrequency-treatment
#2
G Kokolakis, L von Eichel, M Ulrich, J Lademann, T Zuberbier, M A Hofmann
INTRODUCTION: Fractionated radiofrequency (RF) tissue tightening is an alternative method to fractionated laser treatment of skin wrinkling, laxity and acne scars, with reduced risk of scarring or persistent pigmentation. The aim of this study was to evaluate and quantify the wound healing process after RF treatment. MATERIALS AND METHODS: 12 patients were treated with a 64-pin fractional bipolar RF device with 60 mJ/pin applied energy. Confocal laser scanning microscopy (CLSM) examination was performed on day 1, day 2, day 7 and day 14 after treatment...
May 15, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/29759708/intra-atrial-right-coronary-artery-and-its-ablation-implications
#3
Balaji Krishnan, Caroline Cross, Richard Dykoski, David G Benditt, Mackenzie Mbai, Edward McFalls, Jian-Ming Li, Stefan Bertog, Venkatakrishna N Tholakanahalli
OBJECTIVES: The study examined the frequency in which a right coronary artery (RCA) anomaly resulting in intra-atrialization of the vessel might increase risk of RCA damage during routine radiofrequency ablation in the right atrium even with low power or temperature. BACKGROUND: Right coronary artery (RCA) injury with endocardial RF ablation of the right atrium is a rare complication. METHODS: This prospective observational study comprised an analysis of coronary artery anatomies in 331 patients who underwent autopsies at our institution from 2005 to 2014...
September 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29759495/in-vitro-validation-of-the-lesion-size-index-to-predict-lesion-width-and-depth-after-irrigated-radiofrequency-ablation-in-a-porcine-model
#4
Vittorio Calzolari, Luca De Mattia, Stefano Indiani, Martino Crosato, Alberto Furlanetto, Claudia Licciardello, Paolo Antonio Maria Squasi, Zoran Olivari
OBJECTIVES: In an in vitro model, the authors tested the hypotheses that: 1) lesion dimensions correlate with lesion size index (LSI); and 2) LSI could predict lesion dimensions better than power, contact force (CF), and force-time integral (FTI). BACKGROUND: When performing radiofrequency (RF) catheter ablation for cardiac arrhythmias, reliable predictors of lesion quality are lacking. The LSI is a multiparametric index incorporating time, power, CF, and impedance recorded during ablation...
October 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29730694/intracardiac-echocardiography-to-guide-catheter-ablation-of-an-accessory-pathway-in-ebstein-s-anomaly-a-case-report
#5
Gabriel Cismaru, Lucian Muresan, Radu Rosu, Mihai Puiu, Gabriel Gusetu, Rodica Toganel, Dana Pop, Dumitru Zdrenghea
We present the case of a 17-year-old girl with Ebstein anomaly and repeated episodes of reentrant tachycardia due to a right posterior accessory pathway. Catheter ablation was performed using intracardiac echocardiography. A ViewFlex Xtra probe was inserted and showed an anormal tricuspid valve with elongated anterior leaflet and low insertion of the septal leaflet towards the apex. The anatomical annulus was identified by the course of the right coronary artery. RF application on the posterior annulus stopped the reentrant arrhythmia...
May 2, 2018: Medical Ultrasonography
https://www.readbyqxmd.com/read/29722859/contact-force-with-magnetic-guided-catheter-ablation
#6
Francis Bessière, Christopher Zikry, Lena Rivard, Katia Dyrda, Paul Khairy
Aims: Achieving adequate catheter tip-tissue contact is essential for delivering robust radiofrequency (RF) ablation lesions. We measured the contact force generated by a remote magnetic-guided catheter navigation system. Methods and results: A plexiglass model with an integrated scale was fashioned to mimic transvenous and retrograde access to sites in the right atrium and right and left ventricles. An 8 Fr RF ablation catheter was steered by remote magnetic guidance at fields of 0...
May 1, 2018: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29722466/post-procedural-lge-cmr-comparison-of-laser-and-radiofrequency-ablation-lesions-after-pulmonary-vein-isolation
#7
Rosa M Figueras I Ventura, Andrei D Mǎrgulescu, Eva M Benito, Francisco Alarcón, Norihiro Enomoto, Susanna Prat-Gonzalez, Rosario J Perea, Roger Borràs, Fredy Chipa, Elena Arbelo, Jose M Tolosana, Josep Brugada, Antonio Berruezo, Lluis Mont
INTRODUCTION: The purpose of this study was to compare the anatomical characteristics of scar formation achieved by visual guided laser balloon (Laser) and radiofrequency (RF) pulmonary vein isolation (PVI), using late-gadolinium-enhanced cardiac magnetic resonance imaging (LGE-CMR). METHODS AND RESULTS: We included 17 patients with paroxysmal or early persistent drug resistant AF who underwent Laser ablation; 2 were excluded due to procedure-related complications...
May 3, 2018: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/29722035/time-and-temperature-dependence-of-radiofrequency-ablation-in-the-human-placenta
#8
Nisarat Phithakwatchara, Preechaya Makarasen, Katika Nawapun, Suchanan Hanamornroongruang, Sommai Viboonchart, Tuangsit Wataganara
OBJECTIVE: To compare radiofrequency (RF) effects on fresh placentae with varying levels of sustained time (Ts) and degrees of target temperature (o t). METHOD: A total of 108 pieces of fresh placentae were coagulated with a 2-cm RF needle at 60 W in an organ bath. The vertical and horizontal diameters (Vd, Hd) of tissue coagulation visualized by ultrasound were measured. The impacts of 12 different Ts-o t combinations on the ablation size ascertained on pathological examination (Vdp , Hdp ) were compared using two-way ANOVA...
May 2, 2018: Prenatal Diagnosis
https://www.readbyqxmd.com/read/29701624/efficacy-and-safety-of-a-novel-method-of-insulated-intralesional-radiofrequency-ablation-for-deep-dermal-and-subcutaneous-lesions-a-3-year-institutional-experience
#9
Sweta Subhadarshani, Vishal Gupta, Neha Taneja, Savita Yadav, Somesh Gupta
BACKGROUND: Although insulated intralesional radiofrequency ablation (IL-RFA) is being increasingly used in other specialties, not much information on its safety and efficacy in dermatology is available. OBJECTIVE: To describe our experience with insulated IL-RFA for various dermatological conditions. METHODS: This is a retrospective review of the patients who underwent IL-RFA in the past 3 years. Our technique involved creating a small window in the proximal end of plastic sheath of an intravenous cannula using a surgical blade, and then touching the RF probe to the cannula through the window to deliver the electric current...
May 2018: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/29689761/rf-ablation-thermal-simulation-model-parameter-sensitivity-analysis
#10
Xiaoru Wang, Hongjian Gao, Shuicai Wu, Yanping Bai, Zhuhuang Zhou
OBJECTIVE: The aim of the research is to obtain the relative influences of some critical electro-thermal parameters on the ablation temperature and lesion volume during temperature-controlled radiofrequency ablation (RFA) of liver tumor by parameter sensitivity analysis. METHODS: The finite element method (FEM) has been used to establish the simulation model of RFA temperature field, and the sensitivity of the tissue parameters has been analyzed. The effects of six parameters have been taken into account, including the thermal specific capacity (Cp), the thermal conductivity (k), the electrical conductivity (Sigma), the density (rho), the dielectric constant (Epsilon) and the resistance (R)...
April 10, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/29682022/radiofrequency-and-methylprednisolone-in-treatment-of-lower-back-pain-caused-by-facet-joint-syndrome-comparison-of-the-outcomes
#11
Dagistan Yasar, Okmen Korgun, Dagistan Emine
Introduction: In this trial we have discussed the outcomes of radiofrequency ablation and methylprednisolone treatment in cases diagnosed with facet syndrome; and effects of treatment modality on quality of life is evaluated by visual analogue scale and Oswestry Disability Index. Materials and Methods: This prospective, study was conducted with 100 patients with diagnosis of facet joint syndrome. Patients, benefited from diagnostic block, were separated into two groups, with 50 cases in each...
April 2018: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/29680971/use-of-impedance-based-catheter-tip-to-tissue-contact-assessment-electroanatomic-coupling-index-eci-in-typical-right-atrial-flutter-ablation
#12
Massimiliano Maines, Francesco Peruzza, Alessandro Zorzi, Domenico Catanzariti, Carlo Angheben, Maurizio Del Greco
PURPOSE: The electrical coupling index (ECI) (Abbott, USA) is a marker of tissue contact and ablation depth developed particularly for atrial fibrillation treatment. We sought to evaluate if these measures can be also a marker of lesion efficacy during cavotricuspid isthmus (CTI) ablation for typical right atrial flutter. METHODS: We assessed the ECI values in patients undergoing typical right atrial flutter point-by-point ablation guided by the Ensite Velocity Contact™ (St...
April 21, 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29679219/rf-ablation-pattern-shaping-employing-switching-channels-of-dual-bipolar-needle-electrodes-ex-vivo-results
#13
Jens Ziegle, Chloé Audigier, Johannes Krug, Ghazanfar Ali, Younsu Kim, Emad M Boctor, Michael Friebe
PURPOSE: Radiofrequency (RF) ablation with mono- or bipolar electrodes is a common procedure for hepatocellular carcinoma (HCC) with a low rate of recurrence for small size tumors. For larger lesions and/or non-round/ellipsoid shapes RF ablation has some limitations and generally does not achieve comparable success rates to microwave ablation or high-intensity focused ultrasound therapies. MATERIALS AND METHODS: To shape RF ablations for matching a tumor size and geometry, we have developed an electronic channel switch box for two bipolar needles that generates multiple selectable ablation patterns...
April 20, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29678784/feasibility-safety-and-efficacy-of-a-novel-pre-shaped-nitinol-esophageal-deviator-to-successfully-deflect-the-esophagus-and-ablate-left-atrium-without-esophageal-temperature-rise-during-atrial-fibrillation-ablation-the-deflect-gut-study
#14
Valay Parikh, Vijay Swarup, Jacob Hantla, Venkat Vuddanda, Tawseef Dar, Bharath Yarlagadda, Luigi Di Biase, Amin Al-Ahmad, Andrea Natale, Dhanunjaya Lakkireddy
BACKGROUND: Esophageal thermal injury is a feared complication of radiofrequency ablation (RFA) for atrial fibrillation (AF). Rise in luminal esophageal temperature (LET) limits the ability to deliver RF energy on posterior wall of LA. OBJECTIVE: The aim of this registry was to evaluate feasibility, safety and efficacy of a mechanical esophageal deviation (ED) tool during AF ablation. METHODS: We evaluated 687 patients who underwent RFA for AF...
April 17, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29678186/should-fluid-dynamics-be-included-in-computer-models-of-rf-cardiac-ablation-by-irrigated-tip-electrodes
#15
Ana González-Suárez, Juan J Pérez, Enrique Berjano
BACKGROUND: Although accurate modeling of the thermal performance of irrigated-tip electrodes in radiofrequency cardiac ablation requires the solution of a triple coupled problem involving simultaneous electrical conduction, heat transfer, and fluid dynamics, in certain cases it is difficult to combine the software with the expertise necessary to solve these coupled problems, so that reduced models have to be considered. We here focus on a reduced model which avoids the fluid dynamics problem by setting a constant temperature at the electrode tip...
April 20, 2018: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29663562/atrial-fibrillation-ablation-using-cryoballoon-technology-recent-advances-and-practical-techniques
#16
REVIEW
Shaojie Chen, Boris Schmidt, Stefano Bordignon, Fabrizio Bologna, Laura Perrotta, Takahiko Nagase, K R Julian Chun
Atrial fibrillation (AF) affects 1-2% of the population, and its prevalence is estimated to double in the next 50 years as the population ages. AF results in impaired patients' life quality, deteriorated cardiac function and even increased mortality. Antiarrhythmic drugs frequently fail to restore sinus rhythm. Catheter ablation is a valuable treatment approach for AF, even as a first-line therapy strategy in selected patients. Effective electrical pulmonary vein isolation (PVI) is the cornerstone of all AF ablation strategies...
April 16, 2018: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/29657591/the-lesion-characteristics-assessed-by-lge-mri-after-the-cryoballoon-ablation-and-conventional-radiofrequency-ablation
#17
Jun Kurose, Kunihiko Kiuchi, Koji Fukuzawa, Shumpei Mori, Hirotoshi Ichibori, Hiroki Konishi, Yayoi Taniguchi, Kiyohiro Hyogo, Hiroshi Imada, Hideya Suehiro, Yu-Ichi Nagamatsu, Tomomi Akita, Makoto Takemoto, Ken-Ichi Hirata, Shinsuke Shimoyama, Yoshiaki Watanabe, Tatsuya Nishii, Noriyuki Negi, Katsusuke Kyotani
Background: Rhythm outcomes after the pulmonary vein isolation (PVI) using the cryoballoon (CB) are reported to be excellent. However, the lesions after CB ablation have not been well discussed. We sought to characterize and compare the lesion formation after CB ablation with that after radiofrequency (RF) ablation. Methods: A total of 42 consecutive patients who underwent PVI were enrolled (29 in the CB group and 13 in the RF group). The PVI lesions were assessed by late gadolinium enhancement magnetic resonance imaging 1-3 months after the PVI...
April 2018: Journal of Arrhythmia
https://www.readbyqxmd.com/read/29652390/integrated-catheter-for-simultaneous-radio-frequency-ablation-and-optoacoustic-monitoring-of-lesion-progression
#18
Johannes Rebling, Francisco Javier Oyaga Landa, Xosé Luís Deán-Ben, Alexandre Douplik, Daniel Razansky
Radio frequency (RF) catheter ablation is commonly used to eliminate dysfunctional cardiac tissue by heating via an alternating current. Clinical outcomes are highly dependent on careful anatomical guidance, electrophysiological mapping, and careful RF power titration during the procedure. Yet, current treatments rely mainly on the expertise of the surgeon to assess lesion formation, causing large variabilities in the success rate. We present an integrated catheter design suitable for simultaneous RF ablation and real-time optoacoustic monitoring of the forming lesion...
April 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29651715/can-tumor-coverage-evaluated-24-h-post-radiofrequency-ablation-predict-local-tumor-progression-of-liver-metastases
#19
Frederik Vandenbroucke, Jef Vandemeulebroucke, Nico Buls, Ruedi F Thoeni, Johan de Mey
PURPOSE: To assess the predictive value for local tumor progression (LTP) of geometrical tumor coverage using the contrast-enhanced (ce-)CT images acquired before and within 24 h after radiofrequency (RF) ablation. METHODS: Twenty patients (6 male and 14 female, median age 62 years) with 45 focal hypovascular liver metastases (16 colorectal carcinoma, 3 melanoma and 1 breast carcinoma) underwent RF ablation under CT-guidance and received a ce-PET/CT scan within 24 h post-procedure...
April 12, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29628298/thermal-ablation-of-t1c-renal-cell-carcinoma-a-comparative-assessment-of-technical-performance-procedural-outcome-and-safety-of-microwave-ablation-radiofrequency-ablation-and-cryoablation
#20
Wenhui Zhou, Ronald S Arellano
PURPOSE: To evaluate perioperative outcomes of thermal ablation with microwave (MW), radiofrequency (RF), and cryoablation for stage T1c renal cell carcinoma (RCC). MATERIALS AND METHODS: A retrospective analysis of 384 patients (mean age, 71 y; range, 22-88 y) was performed between October 2006 and October 2016. Mean radius, exophytic/endophytic, nearness to collecting system or sinus, anterior/posterior, and location relative to polar lines; preoperative aspects and dimensions used for anatomic classification; and centrality index scores were 6...
April 6, 2018: Journal of Vascular and Interventional Radiology: JVIR
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