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Ablation Techniques

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https://www.readbyqxmd.com/read/28523504/laser-ablation-inductively-coupled-plasma-mass-spectrometry-imaging-of-plant-metabolites
#1
Callie Seaman
LA-ICP-MS (Laser Ablation Inductively Coupled Plasma Mass Spectrometry) is a highly sensitive isotopic and elemental analytical technique that has a wide application for solid samples such as plant material. Within this chapter we describe how to prepare leaf material, seeds, and fruit for 2D elemental distribution maps, preparation of reference materials, method condition optimization, special resolution calculation, and the limit of detection.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28523127/high-intensity-focused-ultrasound-hifu-ablation-of-benign-thyroid-nodules-a-systematic-review
#2
REVIEW
Brian Hung-Hin Lang, Arnold L H Wu
BACKGROUND: With an increasing number of imaging studies being done nowadays, the number of incidentally discovered thyroid nodules is expected to rise. Although many of these nodules are small and benign in nature, some do grow and may cause pressure and/or thyrotoxic symptoms. Surgical resection has traditionally been recommended for symptomatic nodules but is associated with risk of hypothyroidism, bleeding, infection, and nerve damage. High intensity focused ultrasound (HIFU) is one of the non-surgical thermal ablation techniques that may serve as an alternative in the treatment of benign thyroid nodules...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28521346/real-time-magnetic-resonance-imaging-guided-biopsy-using-smartframe%C3%A2-stereotaxis-in-the-setting-of-a-conventional-diagnostic-magnetic-resonance-imaging-suite
#3
Justin K Scheer, Thomas Hamelin, Leon Chang, Brian Lemkuil, Bob S Carter, Clark C Chen
BACKGROUND: Real-time magnetic resonance imaging (MRI) visualization during stereotactic needle biopsies affords several valuable benefits to the neurosurgeon, including the opportunity to visually confirm the biopsy site at the time of surgery. Until now, reported experiences with this technique have been limited to the setting of intraoperative MRI or dedicated procedural MRI suites with modified ventilation systems. OBJECTIVE: To describe our experience with 11 consecutive patients who underwent real-time MRI-guided biopsy performed using SmartFrame® stereotaxis (MRI Interventions, Irvine, California) in the setting of a conventional diagnostic MRI suite...
June 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28520959/the-effects-of-gender-on-electrical-therapies-for-the-heart-procedural-considerations-results-and-complications-a-report-from-the-xii-congress-of-the-italian-association-on-arrhythmology-and-cardiostimulation-aiac
#4
Igor Diemberger, Raffaella Marazzi, Michela Casella, Francesca Vassanelli, Paola Galimberti, Mario Luzi, Alessio Borrelli, Ezio Soldati, Pier Giorgio Golzio, Stefano Fumagalli, Pietro Francia, Luigi Padeletti, Gianluca Botto, Giuseppe Boriani
Use of cardiac implantable devices and catheter ablation is steadily increasing in Western countries following the positive results of clinical trials. Despite the advances in scientific knowledge, tools development, and techniques improvement we still have some grey area in the field of electrical therapies for the heart. In particular, several reports highlighted differences both in medical behaviour and procedural outcomes between female and male candidates. Women are referred later for catheter ablation of supraventricular arrhythmias, especially atrial fibrillation, leading to suboptimal results...
May 17, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28516273/a-comparative-study-of-ablation-boundary-sharpness-after-percutaneous-radiofrequency-cryo-microwave-and-irreversible-electroporation-ablation-in-normal-swine-liver-and-kidneys
#5
Francois H Cornelis, Jeremy C Durack, Simon Y Kimm, Thomas Wimmer, Jonathan A Coleman, Stephen B Solomon, Govindarajan Srimathveeravalli
PURPOSE: To compare ablation boundary sharpness after percutaneous radiofrequency ablation (RFA), cryoablation (CA), microwave ablation (MWA) and irreversible electroporation (IRE) ablation in normal swine liver and kidney. MATERIALS AND METHODS: Percutaneous CT-guided RFA (n = 5), CA (n = 5), MWA (n = 5) and IRE (n = 5) were performed in the liver and kidney of four Yorkshire pigs. Parameters were chosen to produce ablations 2-3 cm in diameter with a single ablation probe...
May 17, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28516051/evaluation-of-mr-thermometry-with-proton-resonance-frequency-method-at-7t
#6
Ping Wang
Quantitative and non-invasive temperature mapping using magnetic resonance imaging (MRI) provides a unique way to measure temperature evolution inside biological tissues. The method is widely used in thermal ablation procedures with magnetic fields at or below 3T. In this paper, the sensitivity of the MRI thermometry at 7T was studied using a proton resonance frequency (PRF)-based technique. We first used an agarose gel phantom with MR-compatible thermometry to calibrate the temperature coefficient, and then this temperature coefficient was employed to measure the internal temperature in both ex vivo (beef muscle) and in vivo (rat) experiments using focused ultrasound heating...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28514047/a-simplified-approach-for-fabrication-of-a-lightweight-individualized-impression-tray-with-the-aid-of-existing-obturator-prosthesis-using-lost-salt-technique
#7
Amar Bhochhibhoya, Binod Acharya, Samskar Bickram Rana, Rinu Sharma, Brijesh Maskey
Maxillary defects resulting from ablative oncologic surgery can be extensive and usually have complex contours. Impression procedures for such defects can be time consuming and cumbersome, challenging the skills of even the most-experienced clinician. A well-oriented impression tray with proper extension and adequate contour is essential for successfully capturing the relevant details in impression. This article describes a method using the patient's existing obturator prosthesis to simplify and expedite the fabrication of a lightweight individualized impression tray directly on an irreversible hydrocolloid impression, thus avoiding the preliminary impression procedure for the patient...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28512717/infrared-laser-ablation-sample-transfer-of-tissue-dna-for-genomic-analysis
#8
Kelin Wang, Fabrizio Donnarumma, Scott W Herke, Patrick F Herke, Kermit K Murray
Infrared (IR) laser ablation was used to remove material from tissue sections mounted on microscope slides, with subsequent capture in a solvent-containing microcentrifuge tube. Experiments conducted with a 3200-bp double-stranded plasmid DNA template demonstrated IR-laser ablation transfer of intact DNA. The transfer efficiency and the molecular integrity of the captured DNA were evaluated using Sanger sequencing, gel electrophoresis, and fluorimetric analysis. The plasmid DNA was reproducibly transferred with an efficiency of 59 ± 3% at laser fluences of between 10 and 20 kJ/m(2) at a wavelength of 3 μm...
May 17, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28512580/high-intensity-focused-ultrasound-circular-cyclocoagulation-in-glaucoma-a-step-forward-for-cyclodestruction
#9
REVIEW
Rodolfo Mastropasqua, Vincenzo Fasanella, Alessandra Mastropasqua, Marco Ciancaglini, Luca Agnifili
The ciliary body ablation is still considered as a last resort treatment to reduce the intraocular pressure (IOP) in uncontrolled glaucoma. Several ablation techniques have been proposed over the years, all presenting a high rate of complications, nonselectivity for the target organ, and unpredictable dose-effect relationship. These drawbacks limited the application of cyclodestructive procedures almost exclusively to refractory glaucoma. High-intensity focused ultrasound (HIFU), proposed in the early 1980s and later abandoned because of the complexity and side effects of the procedure, was recently reconsidered in a new approach to destroy the ciliary body...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28511267/thermal-ablation-of-lung-tumors-focus-on-microwave%C3%A2-ablation
#10
Thomas J Vogl, Nour-Eldin A Nour-Eldin, Moritz Albrecht, Benjamin Kaltenbach, Wolfgang Hohenforst-Schmidt, Han Lin, Bita Panahi, Kathrin Eichler, Tatjana Gruber-Rouh, Andrei Roman
Background Image-guided thermal ablation can be used for the treatment of medically inoperable primary and metastatic lung cancer. These techniques are based on the heating up or freezing (cryoablation) of a volume of tissue around a percutaneous applicator that induces necrosis of the tumor. Method The English-language literature concerning thermal ablation of the lung was reviewed. Radiofrequency ablation (RFA) is the most widely performed and investigated of these techniques. Microwave ablation (MWA) represents a relatively new alternative that shares the same indications and is conducted in a very similar fashion as RFA...
May 16, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28510647/epicardial-cardioverter-defibrillator-implantation-in-a-4-month-old-infant-bridged-to-heart-transplantation
#11
Cristina Carro, Alberto Francesco Cereda, Giuseppe Annoni, Stefano Maria Marianeschi
Implantable cardioverter-defibrillator (ICD) is the gold standard therapy for the prevention of sudden cardiac death. Nevertheless, ICD placement in the paediatric population is still limited because of several technical difficulties. Several implantation techniques have been proposed but experience in infants with very low weight and less than 6 months is very limited. We herein describe a case of a minimally invasive ICD epicardial implantation in a 4-month-old infant weighing 5 kg. A diagnosis of arrhythmic cardiomyopathy with left ventricular non-compaction disease with ventricular tachycardia storms, QT prolongation and Wolff-Parkinson-White pattern was made...
May 16, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28509777/ultrasound-guided-percutaneous-cryoneurolysis-for-acute-pain-management-a-case-report
#12
Rodney A Gabriel, John J Finneran, Deepa Asokan, Andrea M Trescot, NavParkash S Sandhu, Brian M Ilfeld
We report 3 different cases in which ultrasound-guided percutaneous cryoneurolysis was performed to treat acute pain: 1 patient with refractory incisional pain after percutaneous nephrolithotomy; 1 patient with burns to the foot; and 1 patient with pain from iliac crest grafting. Acute pain associated with surgery or injury is a challenge to treat with local anesthetic-based regional anesthesia techniques when the anticipated pain duration exceeds a few days. Cryoneurolysis is an alternative analgesic method that utilizes extremely cold temperatures to reversibly ablate peripheral nerves and is potentially a novel method for acute pain management...
May 12, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28508759/mri-trus-fusion-for-electrode-positioning-during-irreversible-electroporation-for-treatment-of-prostate-cancer
#13
Alexander D J Baur, Federico Collettini, Judith Enders, Andreas Maxeiner, Vera Schreiter, Carsten Stephan, Bernhard Gebauer, Bernd Hamm, Thomas Fischer
We aimed to introduce an approach for image-guided positioning of electrodes for irreversible electroporation (IRE) in patients with prostate cancer using a magnetic resonance imaging-transrectal ultrasonography (MRI-TRUS) fusion technique. In 10 consecutive patients with biopsy-proven Gleason score ≤3+4 prostate cancer, 19 G electrodes were inserted into the prostate using a transperineal access. Magnetic resonance images of the prostate acquired before IRE were fused with transrectal ultrasound images acquired during IRE...
May 15, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28508042/toward-continuous-wave-operation-of-organic-semiconductor-lasers
#14
Atula S D Sandanayaka, Toshinori Matsushima, Fatima Bencheikh, Kou Yoshida, Munetomo Inoue, Takashi Fujihara, Kenichi Goushi, Jean-Charles Ribierre, Chihaya Adachi
The demonstration of continuous-wave lasing from organic semiconductor films is highly desirable for practical applications in the areas of spectroscopy, data communication, and sensing, but it still remains a challenging objective. We report low-threshold surface-emitting organic distributed feedback lasers operating in the quasi-continuous-wave regime at 80 MHz as well as under long-pulse photoexcitation of 30 ms. This outstanding performance was achieved using an organic semiconductor thin film with high optical gain, high photoluminescence quantum yield, and no triplet absorption losses at the lasing wavelength combined with a mixed-order distributed feedback grating to achieve a low lasing threshold...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28507888/spine-stereotactic-body-radiotherapy-indications-outcomes-and-points-of-caution
#15
Chia-Lin Tseng, Wietse Eppinga, Raphaele Charest-Morin, Hany Soliman, Sten Myrehaug, Pejman Jabehdar Maralani, Mikki Campbell, Young K Lee, Charles Fisher, Michael G Fehlings, Eric L Chang, Simon S Lo, Arjun Sahgal
STUDY DESIGN: A broad narrative review. OBJECTIVES: The objective of this article is to provide a technical review of spine stereotactic body radiotherapy (SBRT) planning and delivery, indications for treatment, outcomes, complications, and the challenges of response assessment. The surgical approach to spinal metastases is discussed with an overview of emerging minimally invasive techniques. METHODS: A comprehensive review of the literature was conducted on the techniques, outcomes, and developments in SBRT and surgery for spinal metastases...
April 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28507740/mark-josephson-pioneer-educator-and-mentor-to-a-generation-of-cardiac-electrophysiologists
#16
William G Stevenson
In January 2017 we lost a giant in cardiac electrophysiology, whose work and teachings touched all of us working in the field. Mark Josephson's early work, building on the work of Hein Wellens in using programmed stimulation and catheter mapping to understand scar-related ventricular tachycardias, led the way to surgical and then catheter ablation as a viable therapy for that arrhythmia. His seminal observations are many and catalogued in 'The Josephson School' a wonderful book with 59 Chapters and extensive commentary devoted to his research...
April 2017: Arrhythmia & Electrophysiology Review
https://www.readbyqxmd.com/read/28506420/update-on-the-role-of-ultrasound-guided-radiofrequency-ablation-for-thyroid-nodule-treatment
#17
Maija Radzina, Vito Cantisani, Madara Rauda, Michael Bachmann Nielsen, Caroline Ewertsen, Ferdinando D'Ambrosio, Peteris Prieditis, Salvatore Sorrenti
Thyroid nodules can be frequently detected in general population, most of them are benign, however malignant cases are rising in the past decades. Ultrasound (US) is the most common imaging modality to assess thyroid nodular lesions, plan patient work-up and guide minimally invasive treatment. The present review paper has been researched to evaluate the current status of radiofrequency ablation (RFA) treatment in order to evaluate indications, techniques, complications, limitations and outcome assessment in benign solid, partially cystic nodules and recurrent malignant nodules...
May 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28500486/tips-and-tricks-for-a-safe-and-effective-image-guided-percutaneous-renal-tumour-ablation
#18
REVIEW
Giovanni Mauri, L Nicosia, G M Varano, G Bonomo, P Della Vigna, L Monfardini, F Orsi
Image-guide thermal ablations are nowadays increasingly used to provide a minimally invasive treatment to patients with renal tumours, with reported good clinical results and low complications rate. Different ablative techniques can be applied, each with some advantages and disadvantages according to the clinical situation. Moreover, percutaneous ablation of renal tumours might be complex in cases where there is limited access for image guidance or a close proximity to critical structures, which can be unintentionally injured during treatment...
May 12, 2017: Insights Into Imaging
https://www.readbyqxmd.com/read/28500479/-catheter-ablation-of-persistent-atrial-fibrillation-where-do-we-go
#19
C Lemeš, K-H Kuck, S Mathew
Despite the very promising initial results of clinical studies, catheter ablation of persistent atrial fibrillation (AF) remains a challenge in modern electrophysiology. On the basis of the hypothesized pathophysiological mechanisms, a variety of ablation strategies have been developed over the course of time. The current ablation strategies range from pulmonary vein isolation (PVI) alone as first-line therapy, through ablation of multiple linear lesions, ablation of complex fractionated atrial electrograms (CFAE), rotor ablation, isolation of fibrotic and scar tissue up to isolation of the left atrial appendage (LAA); however, it is unclear even to the present day whether these complex and time-consuming strategies actually improve the success rate of ablation therapy...
May 12, 2017: Herz
https://www.readbyqxmd.com/read/28496936/strategies-to-improve-safety-and-efficacy-of-atrial-fibrillation-ablation-using-electrode-multipolar-phased-rf-pvac%C3%A2-catheter-a-case-report
#20
Fabio Dorfman, Cristiano Dietrich, Paulo Costa, Evandro Sbaraini, Rafael Abt, Dalmo Moreira, Cézar Mesas
Phased radiofrequency ablation with a single catheter technique, using a 9-electrode circumferential catheter, is a viable approach to pulmonary vein isolation for the treatment of atrial fibrillation. However, creating effective transmural lesions with such technique, while avoiding serious complications like atrioesophageal fistula, can be difficult. This case illustrates a challenging scenario, where catheter maneuvers fail to allow safe radiofrequency delivery, due to esophageal temperature rise, despite extensive navigating maneuvers...
October 2016: Journal of Atrial Fibrillation
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