Factors Influencing Intra-Articular Fluid Temperature Profiles with Radiofrequency Ablation

2009 ◽  
Vol 91 (10) ◽  
pp. 2448-2454 ◽  
Author(s):  
Bojan B Zoric ◽  
Nils Horn ◽  
Sepp Braun ◽  
Peter J Millett
Keyword(s):  
Radiofrequency Ablation ◽  
Temperature Profiles ◽  
Fluid Temperature ◽  
Factors Influencing

Treatment of Arrhythmias by Radiofrequency Ablation

2013 ◽  
Author(s):  
M. Erol Ulucakli ◽  
Evan P. Sheehan
Keyword(s):  
Radiofrequency Ablation ◽  
Cardiac Tissue ◽  
Clinical Applications ◽  
Bioheat Transfer ◽  
Temperature Profiles ◽  
Cellular Injury ◽  
Rf Ablation ◽  
Transcatheter Therapy ◽  
Wide Range ◽  
Primary Modality

Radiofrequency ablation may be described as a thermal strategy to destroy tissue by increasing its temperature and causing irreversible cellular injury. Radiofrequency ablation is a relatively new modality which has found use in a wide range of medical applications and gained acceptance. RF ablation has been used to destroy tumors in the liver, prostate, breasts, lungs, kidneys, bones, and eyes. One of the early clinical applications was its use in treating supraventricular arrhythmias by selectively destroying cardiac tissue. Radiofrequency ablation has become established as the primary modality of transcatheter therapy for the treatment of symptomatic arrhythmias. Radiofrequency catheter ablation of cardiac arrhythmias was investigated using a finite-element based solution of the bioheat transfer equation. Spatial and temporal temperature profiles in the cardiac tissue were visualized.

Endothermal ablation for the treatment of clinically significant incompetent lower limb perforating veins: factors influencing the early outcomes

2020 ◽  
pp. 026835552095508
Author(s):  
Kenneth R Woodburn
Keyword(s):  
Radiofrequency Ablation ◽  
Laser Ablation ◽  
Lower Limb ◽  
Closure Rate ◽  
Short Treatment ◽  
Endovenous Laser Ablation ◽  
Perforating Veins ◽  
Factors Influencing ◽  
Early Closure ◽  
Clinically Significant

Background To review the clinical experience and early outcomes of endothermal perforator ablation. Method Retrospective review of an endovenous practice from 2007-2019. Clinically significant incompetent perforators were treated by Endovenous Laser Ablation (EVLA), or segmental radiofrequency ablation (RFA). Result Complete data were available for 110 of the 116 symptomatic incompetent perforating veins treated. Radiofrequency ablation of 20 perforators produced a 55% perforator closure rate, while 90 EVLA perforator ablations resulted in a closure rate of 80%. Closure rates with EVLA varied by location and perforator length. Closure rates for truncal ablation were 95.5% for RFA and 97.2% for EVLA. Conclusion Early closure rates following endothermal ablation of incompetent lower limb perforating veins are lower than those obtained for truncal ablation. EVLA perforator closure appears to be more effective than segmental RFA in most situations but short treatment lengths and location at the ankle are associated with the poorest outcomes.

Radiofrequency Ablation of Hepatic Metastases: Factors Influencing Local Tumor Progression

2014 ◽  
Vol 21 (9) ◽  
pp. 3090-3095 ◽  
Author(s):  
Chang-Hsien Liu ◽  
Chih-Yung Yu ◽  
Wei-Chou Chang ◽  
Ming-Shen Dai ◽  
Cheng-Wen Hsiao ◽  
...  
Keyword(s):  
Radiofrequency Ablation ◽  
Tumor Progression ◽  
Hepatic Metastases ◽  
Local Tumor Progression ◽  
Local Tumor ◽  
Factors Influencing

Radiofrequency Catheter Ablation of Cardiac Arrhythmias

2011 ◽  
Author(s):  
M. Erol Ulucakli
Keyword(s):  
Radiofrequency Ablation ◽  
Catheter Ablation ◽  
Cardiac Arrhythmias ◽  
Radiofrequency Catheter Ablation ◽  
Cardiac Tissue ◽  
Bioheat Transfer ◽  
Temperature Profiles ◽  
Cellular Injury ◽  
Wide Range ◽  
Primary Modality

Radiofrequency ablation could be described as a thermal strategy to destroy a tissue by increasing its temperature and causing anirreversible cellular injury. Radiofrequency ablation is a relatively new modality which has found use in a wide range of medical applications and gained acceptance. RF ablation has been used in destroying tumors in liver, prostate, breast, lung, kidney, bones, and the eye. One of the early applications in clinical setting was its use in treating supraventricular arrhythmias by selectively destroying cardiac tissue. Radiofrequency ablation has become established as the primary modality of transcatheter therapy for the treatment of symptomatic arrhythmias. Radiofrequency catheter ablation of cardiac arrhythmias were investigated using a finite-element based solution of bioheat transfer equation. Spatial and temporal temperature profiles in the cardiac tissue were visualized.

scholarly journals Modified methodology for determining the temperature profiles of inverted u-tubes steam generators used in pwr power plants

2021 ◽  
Vol 9 (2B) ◽  
Author(s):  
Marcos Filardy Curi
Keyword(s):  
Heat Exchanger ◽  
Phase Change ◽  
Power Plants ◽  
Flow Direction ◽  
Saturated Steam ◽  
Geometrical Parameters ◽  
Temperature Profiles ◽  
Fluid Temperature ◽  
Secondary Circuit ◽  
Steam Generators

The most common and reliable methodology for determining temperature profiles of Inverted U-tubes Steam Generators is using Computational Fluid Dynamics (CFD) programs. In this work, we developed a modified methodology, using the Wolfram Mathematica software, in order to determine, with good approximation, the temperature profiles of these kind of equipment. The first step was to determine expressions for the physical properties of the water in the operational conditions, like density, thermal conductivity, specific heat and dynamic viscosity. Geometrical parameters like tubes diameter and sub-channel flowing area, as well as the flow parameters like flow mass of primary and secondary fluid, were also considered for determining the numbers of Reynolds, Prandtl, Nusselt and, consequently, the variation of convective coefficients and the global heat transfer coefficient. With subroutines that use the method of the lines we were able to solve the partial differential equations applied to parallel and countercurrent heat exchangers with no phase change. The U-tubes SG were divided in two regions which the first one was calculated considering a parallel heat exchanger and the second one was calculated considering a countercurrent heat exchanger, depending on the flow direction of the primary and secondary circuit. During the phase change, a constant variation of the enthalpy was considered, making the primary fluid temperature decrease following a linear behavior. Using the developed methodology called “Enthalpy Ruler”, the encountered results were considered adequate, since the defined lengths are compatible with the constant variation of the enthalpy from the compressed liquid to saturated steam.

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