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Zhang Y, Gao H, He H, Liu J, Xu F, Wu S, Zhou J, Cheng Z. Microwave ablation on ex vivo porcine pancreas: The influence of ablation parameters on ablation results and fat liquefaction. Proc Inst Mech Eng H 2024; 238:814-826. [PMID: 39045922 DOI: 10.1177/09544119241261891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2024]
Abstract
The pancreas is adjacent to critical organs; excessive microwave ablation (MWA) can result in serious complications. The purpose of this paper is to provide the reference data of pancreas MWA for clinicians, analyze the ablation outcomes under different ablation parameters, and determine the critical temperature of pancreatic surface fat liquefaction outflow. Combinations of two power levels (30 W and 55 W), three antenna diameters (1.3 mm, 1.6 mm, and 1.9 mm), and three ablation times (1 min, 1.5 min, and 2 min) were applied to an ex vivo pig pancreas. Temperature measurements were taken at four thermocouple points. The center point is located 5 mm horizontally from the antenna slot, with a temperature measurement point located 5 mm above, below, and to the right of the center point. Main effect analysis and variance analysis were used to quantify the influences of each factor on the ablation outcomes. At 30 W, the antenna diameter contributing the most at 48.5%. At 30 W-1.3 mm-1 min, the spherical index (1.41) is closest to 1. At 55 W, the coagulation zone size was almost only affected by the ablation time, with a contribution rate of 28.7%, the temperature at point C exceeds point B. On the surface of the ex vivo porcine pancreas, the fat outflow temperature was 54ã. Ablation combinations with low power, short duration, and small antenna diameter results in a more nearly spherical coagulation zone. When performing MWA on the pancreas, it is advisable to avoid areas with higher fat content, while keeping the pancreatic surface temperature below 54°C.
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Affiliation(s)
- Yubo Zhang
- Faculty of Environmental and Life Sciences, Beijing University of Technology, Beijing, China
| | - Hongjian Gao
- Faculty of Environmental and Life Sciences, Beijing University of Technology, Beijing, China
| | - Huijing He
- Faculty of Environmental and Life Sciences, Beijing University of Technology, Beijing, China
| | - Ju Liu
- Faculty of Environmental and Life Sciences, Beijing University of Technology, Beijing, China
| | - Fan Xu
- Faculty of Environmental and Life Sciences, Beijing University of Technology, Beijing, China
| | - Shuicai Wu
- Faculty of Environmental and Life Sciences, Beijing University of Technology, Beijing, China
| | - Jie Zhou
- Interventional Ultrasound Department, Chinese PLA General Hospital, Beijing, China
| | - Zhigang Cheng
- Interventional Ultrasound Department, Chinese PLA General Hospital, Beijing, China
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Balducci D, Montori M, Martini F, Valvano M, De Blasio F, Argenziano ME, Tarantino G, Benedetti A, Bendia E, Marzioni M, Maroni L. The Impact of Radiofrequency Ablation on Survival Outcomes and Stent Patency in Patients with Unresectable Cholangiocarcinoma: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Cancers (Basel) 2024; 16:1372. [PMID: 38611050 PMCID: PMC11010977 DOI: 10.3390/cancers16071372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 03/25/2024] [Accepted: 03/29/2024] [Indexed: 04/14/2024] Open
Abstract
Endoluminal biliary radiofrequency ablation (RFA) has been proposed as a palliative treatment for patients with malignant biliary obstruction (MBO) in order to improve stent patency and survival. However, the existing data on patients with inoperable extrahepatic cholangiocarcinoma (eCCA) are conflicting. We performed a meta-analysis of randomized trials comparing RFA plus stenting versus stenting alone in patients with inoperable eCCA. We searched for trials published in the PubMed/MEDLINE, Scopus, and Cochrane databases up to November 2023. Data extraction was conducted from published studies, and a quality assessment was carried out in accordance with the guidelines recommended by the Cochrane Collaboration. Hazard ratios (HRs) with 95% CI were estimated from the trials. The primary endpoints of interest were overall survival and stent patency. Out of 275 results, 5 randomized trials and 370 patients were included. While overall survival was not different between the groups (HR 0.62; 95% CI 0.36-1.07; p = 0.09; I2 = 80%;), the subgroup analysis of studies employing plastic stents showed a trend toward better survival in the RFA-treated group (HR 0.42; 95% CI 0.22-0.80; p = 0.009; I2 = 72%). Stent patency was improved in patients receiving RFA (HR 0.64; 95% CI 0.45-0.90; p = 0.01; I2 = 23%). Adverse events were not different between the groups (OR 1.21; 95% CI 0.69-2.12; p = 0.50; I2 = 0%). Despite the promising results, high heterogeneity and potential biases in the included studies suggest the need for further high-quality randomized trials to explore the potential cumulative effects of RFA on CCA treatment outcomes.
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Affiliation(s)
- Daniele Balducci
- Clinic of Gastroenterology, Hepatology, and Emergency Digestive Endoscopy, Università Politecnica delle Marche, 60126 Ancona, Italy
| | - Michele Montori
- Clinic of Gastroenterology, Hepatology, and Emergency Digestive Endoscopy, Università Politecnica delle Marche, 60126 Ancona, Italy
| | - Francesco Martini
- Clinic of Gastroenterology, Hepatology, and Emergency Digestive Endoscopy, Università Politecnica delle Marche, 60126 Ancona, Italy
| | - Marco Valvano
- Gastroenterology Unit, Division of Gastroenterology, Hepatology, and Nutrition, Department of Life, Health and Environmental Sciences, University of L’Aquila, 67100 L’Aquila, Italy
- Division of Gastroenterology, Galliera Hospital, 16128 Genoa, Italy
| | - Federico De Blasio
- Clinic of Gastroenterology, Hepatology, and Emergency Digestive Endoscopy, Università Politecnica delle Marche, 60126 Ancona, Italy
| | - Maria Eva Argenziano
- Clinic of Gastroenterology, Hepatology, and Emergency Digestive Endoscopy, Università Politecnica delle Marche, 60126 Ancona, Italy
| | - Giuseppe Tarantino
- Clinic of Gastroenterology, Hepatology, and Emergency Digestive Endoscopy, Università Politecnica delle Marche, 60126 Ancona, Italy
| | - Antonio Benedetti
- Clinic of Gastroenterology, Hepatology, and Emergency Digestive Endoscopy, Università Politecnica delle Marche, 60126 Ancona, Italy
| | - Emanuele Bendia
- Division of Digestive Diseases, Digestive Endoscopy and Inflammatory Bowel Diseases, A.O.U. “Ospedali Riuniti”, 60126 Ancona, Italy
| | - Marco Marzioni
- Clinic of Gastroenterology, Hepatology, and Emergency Digestive Endoscopy, Università Politecnica delle Marche, 60126 Ancona, Italy
| | - Luca Maroni
- Clinic of Gastroenterology, Hepatology, and Emergency Digestive Endoscopy, Università Politecnica delle Marche, 60126 Ancona, Italy
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Khizar H, Hu Y, Wu Y, Ali K, Iqbal J, Zulqarnain M, Yang J. Efficacy and Safety of Radiofrequency Ablation Plus Stent Versus Stent-alone Treatments for Malignant Biliary Strictures: A Systematic Review and Meta-analysis. J Clin Gastroenterol 2023; 57:335-345. [PMID: 36628465 PMCID: PMC9983754 DOI: 10.1097/mcg.0000000000001810] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Accepted: 10/22/2022] [Indexed: 01/12/2023]
Abstract
BACKGROUND/AIMS Malignant biliary strictures (MBS) are very aggressive and cannot be diagnosed in the early stages due to their asymptomatic nature. Stenting the stricture area of the biliary tree is palliative treatment but has poor survival time. Radiofrequency ablation plus stent (RFA+S) have been recently used to improve the survival and stent patency time in patients with MBS. In this systematic review and meta-analysis, we tried to evaluate the efficacy and safety of radiofrequency ablation. MATERIALS AND METHODS Study search up to December 2021 was performed in different medical databases such as PubMed, Web of Science, and Cochrane library, etc. We selected eligible studies reporting survival time, stent patency time, and adverse events in patients with MBS. We compare the outcomes of RFA+S and stent-alone treatment groups. RESULTS A total of 15 studies (6 randomized controlled trials and 9 observational studies) with 1815 patients were included for meta-analysis of which 701 patients were in RFA+S group and 1114 patients in the stent-alone group. Pooled mean difference of survival time was 2.88 months (95% CI: 1.78-3.97) and pooled mean difference of stent patency time was 2.11 months (95% CI: 0.91-3.30) and clinical success risk ratio was 1.05 (95% CI: 1.01-1.09). Risk ratios for adverse events are given; Bleeding 0.84 (95% CI: 0.34-2.11), abdominal pain 1.06 (95% CI: 0.79-1.40), pancreatitis 0.93 (95% CI: 0.43-2.01), cholangitis 1.07 (95% CI: 0.72-1.59), and stent dysfunction 0.87 (95% CI: 0.70-1.07). CONCLUSIONS Radiofrequency ablation is involved in increased survival and stent patency time for MBS patients. With the help of better techniques, adverse events can be limited.
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Affiliation(s)
- Hayat Khizar
- Departments of Gastroenterology, International Education College of Zhejiang Chinese Medical University, Hangzhou
- Department of Gastroenterology, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine
| | - Yufei Hu
- Department of Gastroenterology, The Fourth School of Clinical Medicine, Zhejiang Chinese Medical University
| | - Yanhua Wu
- Department of Gastroenterology, The Fourth School of Clinical Medicine, Zhejiang Chinese Medical University
| | - Kamran Ali
- Dermatology, International Education College of Zhejiang Chinese Medical University
| | - Junaid Iqbal
- Department of Metabolism and Endocrinology, National Clinical Research Center for Metabolic Diseases, The Second Xiangya Hospital of Central South University, Changsha, Hunan Province
| | - Muhammad Zulqarnain
- Departments of Gastroenterology, International Education College of Zhejiang Chinese Medical University, Hangzhou
| | - Jianfeng Yang
- Department of Gastroenterology, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine
- Key Laboratory of Clinical Cancer Pharmacology and Toxicology Research of Zhejiang Province
- Key Laboratory of Integrated Traditional Chinese and Western Medicine for Biliary and Pancreatic Diseases of Zhejiang Province, Hangzhou, Zhejiang Province, China
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Silver Nanofunctionalized Stent after Radiofrequency Ablation Suppresses Tissue Hyperplasia and Bacterial Growth. Pharmaceutics 2022; 14:pharmaceutics14020412. [PMID: 35214144 PMCID: PMC8876892 DOI: 10.3390/pharmaceutics14020412] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 02/08/2022] [Accepted: 02/10/2022] [Indexed: 02/01/2023] Open
Abstract
Intraductal radiofrequency (RF) ablation combined with placement of a self-expandable metal stent (SEMS) for malignant biliary obstruction has risks such as stent- and heat-induced biliary sludge and restenosis. Here, we investigated the efficacy of a silver nanoparticles (AgNPs)-coated SEMS to inhibit tissue hyperplasia and bacterial growth caused by RF ablation with stent placement in the rabbit bile duct. The release behavior and antibacterial effects of AgNPs-coated SEMSs were evaluated. Then, SEMSs were successfully placed in all rabbits immediately after RF ablation. Ag ions were rapidly released at the beginning and then showed a gradual release behavior. The AgNPs-coated SEMS significantly inhibited bacterial activity compared to the uncoated SEMS (p < 0.05). Cholangiography and histological examination confirmed that the level of tissue hyperplasia was significantly lower in the AgNPs group than in the control group (all p < 0.05). Immunohistochemistry analyses revealed that TUNEL-, HSP 70-, and α-SMA-positive areas were significantly lower in the AgNPs group than in the control group (all p < 0.05). Intraductal RF ablation combined with nanofunctionalized stent placement represents a promising new approach for suppressing thermal damage as well as stent-induced tissue hyperplasia and bacterial growth.
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Pekçevik R, Ballı Ö. Percutaneous Intraductal Microwave Ablation and Self-expandable Metallic Stenting: A New Treatment Method for Malignant Extrahepatic Biliary Obstruction. Cardiovasc Intervent Radiol 2020; 44:110-117. [PMID: 33145700 DOI: 10.1007/s00270-020-02684-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Accepted: 10/07/2020] [Indexed: 11/25/2022]
Abstract
PURPOSE To evaluate the patency and clinical efficacy of percutaneous intraductal microwave ablation (PIMWA) and uncovered self-expandable metallic stents (USEMs) in inoperable malignant extrahepatic biliary obstruction. MATERIALS AND METHODS The procedures to be performed on patients with malignant inoperable extrahepatic biliary obstruction were decided by a multidisciplinary team including an interventional radiologist. In our study, 141 patients were evaluated retrospectively. Twenty-one patients who underwent PIMWA + USEMs with the MedWaves AveCure microwave system (AveCure® Intelligent Controller and Super-Flex Smart Catheter) and met the inclusion criteria were included in the study. Complications related to the intervention, stent patency, survival time, serum bilirubin levels, and the general condition of the patients were noted. RESULTS The median stent patency and the median survival time were 108 and 143 days, respectively. The rates of 30-day, 2-month, 6-month and 8-month survival were 95.2%, 85.7%, 38.1%, and 14.3%, respectively. CONCLUSION The PIMWA + USEMs procedure is a safe, effective, and minimally invasive alternative palliative treatment method in patients with malignant inoperable extrahepatic biliary obstruction.
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Affiliation(s)
- Rıdvan Pekçevik
- Department of Interventional Radiology, İzmir Katip Çelebi University Atatürk Training and Research Hospital, 35360, İzmir, Turkey.
| | - Ömür Ballı
- Department of Interventional Radiology, İzmir Katip Çelebi University Atatürk Training and Research Hospital, 35360, İzmir, Turkey
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