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Thermal ablation

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https://www.readbyqxmd.com/read/28109894/pregnancy-outcomes-following-direct-uterine-fibroid-thermal-ablation-a-review-of-the-literature
#1
REVIEW
Julia Keltz, Mark Levie, Scott Chudnoff
The objective of this review is to describe the reproductive outcomes of women after radiofrequency volumetric thermal ablation (RFVTA) of fibroids or magnetic resonance-guided high-intensity focused ultrasound (MRgHIFU). This is a literature review of the current case reports of reproductive outcomes following direct fibroid thermal ablation at multiple academic and private centers throughout the world. A literature search was performed using PubMed and Medline. All publications that included data of women who underwent radiofrequency fibroid ablation or magnetic resonance-guided high-intensity focused ultrasound of fibroids and subsequently conceived were included...
January 18, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/28106146/asymmetric-waveforms-decrease-lethal-thresholds-in-high-frequency-irreversible-electroporation-therapies
#2
Michael B Sano, Richard E Fan, Lei Xing
Irreversible electroporation (IRE) is a promising non-thermal treatment for inoperable tumors which uses short (50-100 μs) high voltage monopolar pulses to disrupt the membranes of cells within a well-defined volume. Challenges with IRE include complex treatment planning and the induction of intense muscle contractions. High frequency IRE (H-FIRE) uses bursts of ultrashort (0.25-5 μs) alternating polarity pulses to produce more predictable ablations and alleviate muscle contractions associated with IRE...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28105389/chemophototherapy-an-emerging-treatment-option-for-solid-tumors
#3
REVIEW
Dandan Luo, Kevin A Carter, Dyego Miranda, Jonathan F Lovell
Near infrared (NIR) light penetrates human tissues with limited depth, thereby providing a method to safely deliver non-ionizing radiation to well-defined target tissue volumes. Light-based therapies including photodynamic therapy (PDT) and laser-induced thermal therapy have been validated clinically for curative and palliative treatment of solid tumors. However, these monotherapies can suffer from incomplete tumor killing and have not displaced existing ablative modalities. The combination of phototherapy and chemotherapy (chemophototherapy, CPT), when carefully planned, has been shown to be an effective tumor treatment option preclinically and clinically...
January 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28095147/management-of-small-renal-masses-american-society-of-clinical-oncology-clinical-practice-guideline
#4
Antonio Finelli, Nofisat Ismaila, Bill Bro, Jeremy Durack, Scott Eggener, Andrew Evans, Inderbir Gill, David Graham, William Huang, Michael A S Jewett, Sheron Latcha, William Lowrance, Mitchell Rosner, Bobby Shayegan, Houston R Thompson, Robert Uzzo, Paul Russo
Purpose To provide recommendations for the management options for patients with small renal masses (SRMs). Methods By using a literature search and prospectively defined study selection, we sought systematic reviews, meta-analyses, randomized clinical trials, prospective comparative observational studies, and retrospective studies published from 2000 through 2015. Outcomes included recurrence-free survival, disease-specific survival, and overall survival. Results Eighty-three studies, including 20 systematic reviews and 63 primary studies, met the eligibility criteria and form the evidentiary basis for the guideline recommendations...
January 17, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28090757/synergistic-effects-in-combinational-drug-delivery-and-thermal-ablation-using-nanotechnology
#5
EDITORIAL
Wayne Dickson
No abstract text is available yet for this article.
February 2017: BJU International
https://www.readbyqxmd.com/read/28090656/real-time-monitoring-of-tissue-displacement-and-temperature-changes-during-mr-guided-high-intensity-focused-ultrasound
#6
Pierre Bour, Fabrice Marquet, Valéry Ozenne, Solenn Toupin, Erik Dumont, Jean-François Aubry, Matthieu Lepetit-Coiffe, Bruno Quesson
PURPOSE: The therapy endpoint most commonly used in MR-guided high intensity focused ultrasound is the thermal dose. Although namely correlated with nonviable tissue, it does not account for changes in mechanical properties of tissue during ablation. This study presents a new acquisition sequence for multislice, subsecond and simultaneous imaging of tissue temperature and displacement during ablation. METHODS: A single-shot echo planar imaging sequence was implemented using a pair of motion-encoding gradients, with alternated polarities...
January 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28078482/irreversible-electroporation-as-treatment-of-locally-advanced-and-as-margin-accentuation-in-borderline-resectable-pancreatic-adenocarcinoma
#7
P Marsanic, A Mellano, A Sottile, M De Simone
In recent years, many local ablation technologies based on thermal damage have been used in the treatment of locally advanced pancreatic carcinoma (LAPC) and borderline resectable pancreatic carcinoma (BLRPC). However, they are associated with major complications because of possible vascular and ductal damage. Irreversible electroporation (IRE) is a nonthermal ablation technology that seems safe near vital vascular and ductal structures. IRE could be used as exclusive treatment of LAPC (en situ to IRE) after induction chemotherapy In BLRPC, surgery is not really radical in 6% of patients (microscopic residual) and local recurrences occur in 11-42% of apparent radical resections...
January 11, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28078340/biocompatible-cus-based-nanoplatforms-for-efficient-photothermal-therapy-and-chemotherapy-in-vivo
#8
Shuwen Peng, Yuanyuan He, Murat Er, Yuanzhi Sheng, Yueqing Gu, Haiyan Chen
Near-infrared (NIR) photothermal therapy (PTT) is a new approach to ablate cancer without affecting normal tissues. A pivotal concern of PPT is to develop photo-responsive agents with high biocompatibility as well as effective photothermal conversion efficiency. Copper sulfide (CuS) nanoparticles prepared are characterized by their low synthesis cost, wide NIR absorption range, good biocompatibility and favorable NIR photothermal conversion efficiency. CuS nanoparticles were then coated with mesoporous silicon dioxide (SiO2) by the Stober method, and further loaded with anticancer drug doxorubicin (DOX)...
January 12, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28073607/thermal-ablation-versus-surgical-resection-for-the-treatment-of-stage-t1-hepatocellular-carcinoma-in-the-surveillance-epidemiology-and-end-results-database-population
#9
Oleg Mironov, Arash Jaberi, John R Kachura
PURPOSE: To compare survival outcomes of small solitary hepatocellular carcinomas (HCCs) treated with thermal ablation vs resection in the Surveillance, Epidemiology, and End Results (SEER) cohort. MATERIALS AND METHODS: SEER data (November 2014 submission) were searched for histologic diagnoses of HCC and stage T1 disease (≤ 5-cm solitary tumor without vascular invasion). Comparison was made between thermal ablation and resection as the primary treatment. Overall and disease-specific survival were compared by log-rank tests (stratified for presence of fibrosis) and Cox regression (with tumor size and presence of fibrosis covariates)...
January 7, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28073412/-clinical-effect-of-ultrasound-guided-injection-of-biodegradable-poly-lactic-co-glycolic-acid-fe3o4-in-situ-implant-for-magnetic-thermal-ablation-in-treatment-of-nude-mice-with-human-liver-cancer-smmc-7721-cells
#10
B Liang, G Q Zuo, Y Y Zheng, S He, D Y Zuo
Objective: To prepare the Fe3O4-loaded biodegradable liquid-solid phase inversion poly(lactic-co-glycolic acid) (PLGA) in situ implant for ultrasound-guided injection into nude mouse tumor model, and to investigate its clinical effect in thermomagnetic treatment of nude mice with human liver cancer SMMC-7721 cells in an alternating magnetic field. Methods: An in situ implant containing 10% Fe3O4 was prepared, and 50 μl Fe3O4-PLGA-NMP gel was injected into the subcutaneous tissue of Kunming mice. The degradation of this material was observed for 2 consecutive months, and the changes in body weight were recorded...
December 20, 2016: Zhonghua Gan Zang Bing za Zhi, Zhonghua Ganzangbing Zazhi, Chinese Journal of Hepatology
https://www.readbyqxmd.com/read/28072428/3d-modelling-on-biodegradable-nanoparticle-enhanced-cryoablation-of-liver-tumor-based-on-real-anatomical-model
#11
S Y Xu, Z Z He, Y X Zhou, J Liu
BACKGROUND: Nanoparticle-enhanced freezing is of great importance for developing a conformal targeted cryoablation for liver tumor with complex shape. However, the safety and biocompatibility of nanoparticles should also be of major concerns. OBJECTIVE: This study is to investigate the enhanced cryoablation mediated by the MgO nanoparticles which are nontoxic, biodegradable, and have few side-effects on the human body. MATERIALS AND METHODS: A three-dimensional numerical model has been developed based on a real geometrical anatomical structure to characterize such nanocryosurgical freezing of liver tumor...
November 2016: Cryo Letters
https://www.readbyqxmd.com/read/28067975/assessment-of-acute-thermal-damage-volumes-in-muscle-using-magnetization-prepared-3d-t2-weighted-imaging-following-mri-guided-high-intensity-focused-ultrasound-therapy
#12
Robert M Staruch, Joris Nofiele, Jamie Walker, Chenchen Bing, Ananth J Madhuranthakam, April Bailey, Young-Sun Kim, Avneesh Chhabra, Dennis Burns, Rajiv Chopra
PURPOSE: To evaluate magnetization-prepared 3D T2 -weighted magnetic resonance imaging (MRI) measurements of acute tissue changes produced during ablative MR high-intensity focused ultrasound (MR-HIFU) exposures. MATERIALS AND METHODS: A clinical MR-HIFU system (3T) was used to generate thermal lesions (n = 24) in the skeletal muscles of three pigs. T1 -weighted, 2D T2 -weighted, and magnetization-prepared 3D T2 -weighted sequences were acquired before and after therapy to evaluate tissue changes following ablation...
January 9, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28065832/a-novel-method-to-enhance-phenotype-epicardial-functional-substrates-and-ventricular-tachyarrhythmias-in-brugada-syndrome
#13
Fa-Po Chung, Sunu Budhi Raharjo, Yenn-Jiang Lin, Shih-Lin Chang, Li-Wei Lo, Yu-Feng Hu, Ta-Chuan Tuan, Tze-Fan Chao, Jo-Nan Liao, Chin-Yu Lin, Yao-Ting Chang, Yuan Hung, Abigail Te, Shinya Yamada, Hiroshi Tasaka, Shih-Ann Chen, Chin-Tien Wang
BACKGROUND: Fever is associated with the manifestation of Brugada phenotype and ventricular tachycardia/fibrillation (VT/VF) in patients with Brugada syndrome (BrS). The thermal effect on the pathogenesis of functional substrates in BrS remains unknown. OBJECTIVE: The study aimed to elucidate the thermal effect on BrS phenotype, VT/VF, and electrophysiological characteristics of epicardial functional substrates in BrS. METHODS: We consecutively studied 15 patients with BrS receiving radiofrequency catheter ablation (RFCA) for drug-refractory ventricular tachyarrhythmias...
January 5, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28063094/stasis-dermatitis-pathophysiology-evaluation-and-management
#14
REVIEW
Swaminathan Sundaresan, Michael R Migden, Sirunya Silapunt
Stasis dermatitis commonly occurs in older age. It is caused by venous hypertension resulting from retrograde flow due to incompetent venous valves, valve destruction, or obstruction of the venous system. Further tissue changes arise from an inflammatory process mediated by metalloproteinases, which are up-regulated by ferric ion from extravasated red blood cells. Stasis dermatitis presents initially as poorly demarcated erythematous plaques of the lower legs bilaterally, classically involving the medial malleolus...
January 6, 2017: American Journal of Clinical Dermatology
https://www.readbyqxmd.com/read/28062180/determination-of-cryothermal-injury-thresholds-in-tissues-impacted-by-cardiac-cryoablation
#15
Ryan P Goff, Stephen G Quallich, Robert A Buechler, John C Bischof, Paul A Iaizzo
Despite widespread clinical use of cryoablation, there remain questions regarding dosing and treatment times which may affect efficacy and collateral injury. Dosing and treatment times are directly related to the degree of cooling necessary for effective lesion formation. Human and swine atrial, ventricular, and lung tissues were ablated using two cryoablation systems with concurrent infrared thermography. Post freeze-thaw samples were cultured and stained to differentiate viable and non-viable tissue. Matlab code correlated viability staining to applied freeze-thaw thermal cycles, to determine injury thresholds...
January 3, 2017: Cryobiology
https://www.readbyqxmd.com/read/28058731/improved-intercostal-hifu-ablation-using-a-phased-array-transducer-based-on-fermat-s-spiral-and-voronoi-tessellation-a-numerical-evaluation
#16
Pascal Ramaekers, Mario Ries, Chrit T W Moonen, Martijn de Greef
PURPOSE: A major complication for abdominal High Intensity Focused Ultrasound (HIFU) applications is the obstruction of the acoustic beam path by the thoracic cage, which absorbs and reflects the ultrasonic energy leading to undesired overheating of healthy tissues in the pre-focal area. Prior work has investigated the determination of optimized transducer apodization laws, which allow for a reduced rib exposure whilst (partially) restoring focal point intensity through power compensation...
January 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/28054165/percutaneous-thermal-ablation-with-ultrasound-guidance-fusion-imaging-guidance-to-improve-conspicuity-of-liver-metastasis
#17
Antoine Hakime, Steven Yevich, Lambros Tselikas, Frederic Deschamps, David Petrover, Thierry De Baere
PURPOSE: To assess whether fusion imaging-guided percutaneous microwave ablation (MWA) can improve visibility and targeting of liver metastasis that were deemed inconspicuous on ultrasound (US). MATERIALS AND METHODS: MWA of liver metastasis not judged conspicuous enough on US was performed under CT/US fusion imaging guidance. The conspicuity before and after the fusion imaging was graded on a five-point scale, and significance was assessed by Wilcoxon test. Technical success, procedure time, and procedure-related complications were evaluated...
January 4, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28048114/su-f-j-216-mr-guided-non-thermal-pulsed-focused-ultrasound-for-cancer-therapy
#18
C Ma, B Wang, D Cvetkovic, L Chen
PURPOSE: High-intensity focused ultrasound has been investigated for ablative therapy and drug enhancement for gene therapy and chemotherapy. The aim of this work is to explore the feasibility of pulsed focused ultrasound (pFUS) for non-thermal cancer therapy using an in vivo animal model. METHODS: An InSightec ExAblate 2000 with a 1.5T GE MR scanner was used in this study. Suitable ultrasound parameters were investigated to perform non-thermal sonications. LNCaP human prostate tumor cells (106) were injected orthotopically in the prostates of nude mice (n = 16)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047474/su-f-j-10-sliding-mode-control-of-a-sma-actuated-active-flexible-needle-for-medical-procedures
#19
T Podder
PURPOSE: In medical interventional procedures such as brachytherapy, ablative therapies and biopsy precise steering and accurate placement of needles are very important for anatomical obstacle avoidance and accurate targeting. This study presents the efficacy of a sliding mode controller for Shape Memory Alloy (SMA) actuated flexible needle for medical procedures. METHODS: Second order system dynamics of the SMA actuated active flexible needle was used for deriving the sliding mode control equations...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047142/we-ab-bra-04-investigation-of-mri-derived-thermal-dose-models
#20
C MacLellan, D Fuentes, H Espinoza, S Prabhu, G Rao, J Weinberg, R Stafford
PURPOSE: To develop and investigate a novel thermal dose model methodology using MR temperature imaging (MRTI) and post-treatment MRI changes as a surrogate of tissue damage in clinical laser ablation of the brain. METHODS: Post-treatment contrast enhanced T1-weighted images were registered to MRTI acquired during two MR-guided thermal ablation procedures. The non-enhancing central region and hyperintense ring of vascular disruption characteristic of the thermal lesion were segmented manually and resampled into the 2D geometry of the MRTI...
June 2016: Medical Physics
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