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Pulsed radiofrequency

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https://www.readbyqxmd.com/read/29130334/pulsed-epr-imaging-applications-in-the-studies-of-tumor-physiology
#1
Shun Kishimoto, Ken-Ichiro Matsumoto, Keita Saito, Ayano Enomoto, Shingo Matsumoto, James Mitchell, Nallathamby Devasahayam, Murali C Krishna
SIGNIFICANCE: Electron Paramagnetic Resonance imaging (EPRI) is a powerful technique capable of generating images of tissue oxygenation using exogenous paramagnetic probes such as trityl radicals or nitroxyl radicals. Using principles similar to Magnetic Resonance Imaging (MRI) with field gradients, the spatial distribution of the paramagnetic probecan be generatedand,from its spectral features, spatial maps of oxygen can be obtained from live objects. In this review, two methods of signal acquisition, image formation/reconstruction will be described...
November 12, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/29127542/left-atrial-function-after-epicardial-pulmonary-vein-isolation-in-patients-with-atrial-fibrillation
#2
Louise Bagge, Per Blomström, Lena Jidéus, Stefan Lönnerholm, Carina Blomström-Lundqvist
PURPOSE: Epicardial pulmonary vein isolation has become an increasingly used therapy for medically resistant atrial fibrillation. The purpose of the present study was therefore to evaluate if epicardial pulmonary vein isolation combined with ganglionated plexi ablation affects the size and mechanical function of the left atrium, and whether the effects are dependent on the extensiveness of the ablation applications. METHODS: A total of 42 patients underwent an echocardiographic examination prior to and 6 months after a minimal invasive epicardial pulmonary vein isolation procedure for the assessment of the effects on left atrial size and function...
November 10, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29126045/the-effectiveness-of-conservative-non-pharmacological-treatment-of-plantar-heel-pain-a-systematic-review-with-meta-analysis
#3
REVIEW
Stefano Salvioli, Maddalena Guidi, Giulia Marcotulli
Plantar heel pain is one of the most common causes of pain and musculoskeletal pathologies of the foot. The aim of this systematic review was to identify the most effective, conservative and non-pharmacological treatments regarding pain in patients with plantar heel pain. The authors searched 5 databases and included only randomized control trials which investigated the efficacy of a conservative non-pharmacological treatment compared to the placebo, for the outcome of pain. Study selection, data collection and risk of bias assessment were conducted independently by two authors, and consensus was reached with a third author...
June 15, 2017: Foot
https://www.readbyqxmd.com/read/29119066/bipolar-radiofrequency-facet-ablation-of-the-lumbar-facet-capsule-an-adjunct-to-conventional-radiofrequency-ablation-for-pain-management
#4
Robert E Jacobson, Ovidiu Palea, Michelle Granville
Radiofrequency facet ablation (RFA) has been performed using the same technique for over 50 years. Except for variations in electrode size, tip shape, and change in radiofrequency (RF) stimulation parameters, using standard, pulsed, and cooled RF wavelengths, the target points have remained absolutely unchanged from the original work describing RFA for lumbar pain control. Degenerative changes in the facet joint and capsule are the primary location for the majority of lumbar segmental pathology and pain. Multiple studies show that the degenerated facet joint is richly innervated as a result of the inflammatory overgrowth of the synovium...
September 1, 2017: Curēus
https://www.readbyqxmd.com/read/29113751/cardiomyopathy-induced-by-incessant-ventricular-tachycardia-originating-in-the-vicinity-of-the-his-bundle
#5
Sana Ouali, Manel Ben Halima, Selim Boudiche, Anissa Gharbi, Khedher Nadim, Kaouthar Hakim, Fatma Ouarda, Mohamed Sami Mourali
A 04-year-old boy was referred to our institution with severe, progressive heart failure of 4-months duration associated with a persistent wide QRS tachycardia with left bundle branch block and severe left ventricular dysfunction. Because of incessant wide QRS tachycardia refractory to antiarrhythmic drugs, he was referred for electrophysiological study. The ECG was suggestive of VT arising from the right ventricle near the His area. Electrophysiological study revealed that origin of tachycardia was septum of the right ventricle, near His bundle, however the procedure was not successful and an inadvertent complete atrioventricular conduction block occurred...
November 4, 2017: Indian Pacing and Electrophysiology Journal
https://www.readbyqxmd.com/read/29111493/lateral-cutaneous-nerve-entrapment-syndrome-lacnes-a-previously-unrecognized-cause-of-intractable-flank-pain
#6
R C Maatman, N E Papen-Botterhuis, M R M Scheltinga, R M H Roumen
BACKGROUND AND AIMS: Chronic abdominal pain may occasionally be due to terminal endings of intercostal nerves (ACNES, abdominal cutaneous nerve entrapment syndrome) that are entrapped in the abdominal wall. Spontaneous neuropathic flank pain may also be caused by involvement of branches of these intercostal nerves. Aim is to describe a series of patients with flank pain due to nerve entrapment and to increase awareness for an unknown condition coined Lateral Cutaneous Nerve Entrapment Syndrome (LACNES)...
October 27, 2017: Scandinavian Journal of Pain
https://www.readbyqxmd.com/read/29106057/higher-arterial-stiffness-is-associated-with-lower-cognitive-performance-in-patients-with-hypertension
#7
Henrique C S Muela, Valeria A Costa-Hong, Mônica S Yassuda, Natália C Moraes, Claudia M Memória, Michel F Machado, Edson Bor-Seng-Shu, Ricardo C Nogueira, Alfredo J Mansur, Ayrton R Massaro, Ricardo Nitrini, Thiago A Macedo, Luiz A Bortolotto
Cognitive impairment and elevated arterial stiffness have been described in patients with arterial hypertension, but their association has not been well studied. We evaluated the correlation of arterial stiffness and different cognitive domains in patients with hypertension compared with those with normotension. We evaluated 211 patients (69 with normotension and 142 with hypertension). Patients were age matched and distributed according to their blood pressure: normotension, hypertension stage 1, and hypertension stage 2...
November 5, 2017: Journal of Clinical Hypertension
https://www.readbyqxmd.com/read/29102985/study-protocol-for-a-randomised-controlled-trial-of-ultrasound-guided-pulsed-radiofrequency-of-the-genicular-nerves-in-the-treatment-of-patients-with-osteoarthritis-knee-pain
#8
Javier Mata, Pedro Valentí, Beatriz Hernández, Bartolome Mir, Jose Luis Aguilar
INTRODUCTION: The goals for the management of patients with osteoarthritis (OA) of the knee are to control pain and to minimise disability. Because the number of patients will increase as the population ages, alternative approaches to alleviate their joint pain other than conventional treatments are necessary. The purpose of this article is to present a refined protocol to determine if there is long-term improvement in pain and function after ultrasound-guided pulsed radiofrequency treatment of the genicular nerves (GNs) in patients with chronic painful knee OA...
November 3, 2017: BMJ Open
https://www.readbyqxmd.com/read/29096052/toppe-a-framework-for-rapid-prototyping-of-mr-pulse-sequences
#9
Jon-Fredrik Nielsen, Douglas C Noll
PURPOSE: To introduce a framework for rapid prototyping of MR pulse sequences. METHODS: We propose a simple file format, called "TOPPE", for specifying all details of an MR imaging experiment, such as gradient and radiofrequency waveforms and the complete scan loop. In addition, we provide a TOPPE file "interpreter" for GE scanners, which is a binary executable that loads TOPPE files and executes the sequence on the scanner. We also provide MATLAB scripts for reading and writing TOPPE files and previewing the sequence prior to hardware execution...
November 2, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29073724/interleaved-31-p-mrs-imaging-of-human-frontal-and-occipital-lobes-using-dual-rf-coils-in-combination-with-single-channel-transmitter-receiver-and-dynamic-b0-shimming
#10
Byeong-Yeul Lee, Xiao-Hong Zhu, Myung Kyun Woo, Gregor Adriany, Scott Schillak, Wei Chen
In vivo (31) P magnetic resonance spectroscopy (MRS) provides a unique tool for the non-invasive study of brain energy metabolism and mitochondrial function. The assessment of bioenergetic impairment in different brain regions is essential to understand the pathophysiology and progression of human brain diseases. This article presents a simple and effective approach which allows the interleaved measurement of (31) P spectra and imaging from two distinct human brain regions of interest with dynamic B0 shimming capability...
October 26, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/29048058/extra-cavity-radiofrequency-modulator-for-a-lidar-radar-designed-for-underwater-target-detection
#11
Nour Alem, Fabrice Pellen, Guy Le Brun, Bernard Le Jeune
The hybrid lidar-radar technique is commonly used for shallow underwater target detection. This technique requires a powerful blue-green RF-modulated laser with stable microwave frequency. In this paper, a novel modulator design perfectly suited for this application is proposed. It consists of an extra-cavity modulator composed of two plane mirrors and a second-harmonic generator stage within the cavity to maximize the energy efficiency. This modulator is coupled with a picosecond Nd:YAG infrared laser source to insure the emission of a powerful pulse (up to 5 mJ)...
September 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29033744/pulsed-radiofrequency-of-the-supraorbital-nerve-for-the-treatment-of-supraorbital-neuralgia
#12
Harsh Sachdeva, Lance Hoffman, Alaa Abd-Elsyed
No abstract text is available yet for this article.
October 2017: Saudi Journal of Anaesthesia
https://www.readbyqxmd.com/read/29031985/spatial-angular-compounding-technique-for-h-scan-ultrasound-imaging
#13
Mawia Khairalseed, Fangyuan Xiong, Jung-Whan Kim, Robert F Mattrey, Kevin J Parker, Kenneth Hoyt
H-Scan is a new ultrasound imaging technique that relies on matching a model of pulse-echo formation to the mathematics of a class of Gaussian-weighted Hermite polynomials. This technique may be beneficial in the measurement of relative scatterer sizes and in cancer therapy, particularly for early response to drug treatment. Because current H-scan techniques use focused ultrasound data acquisitions, spatial resolution degrades away from the focal region and inherently affects relative scatterer size estimation...
October 11, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29028863/the-future-of-non-invasive-rejuvenation-technology-devices
#14
Michael H Gold
<p>Non-invasive rejuvenation of the skin is performed regularly in many cosmetic offices. Using evidence-based medicine, we will review the various technologies being used for non-invasive rejuvenation. This includes the use of intense pulsed light (IPL), which has been thoroughly studied and shown to be quite useful for this type of rejuvenation in removing the red and brown pigments, as well as affecting collagen. Fractional lasers, both non-ablative and ablative in nature, also can show dramatic improvements in the skin and associated clinical studies are reviewed here...
June 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29028543/a-pulse-programmable-parahydrogen-polarizer-using-a-tunable-electromagnet-and-dual-channel-nmr-spectrometer
#15
Aaron M Coffey, Roman V Shchepin, Bibo Feng, Raul D Colon, Ken Wilkens, Kevin W Waddell, Eduard Y Chekmenev
Applications of parahydrogen induced polarization (PHIP) often warrant conversion of the chemically-synthesized singlet-state spin order into net heteronuclear magnetization. In order to obtain optimal yields from the overall hyperpolarization process, catalytic hydrogenation must be tightly synchronized to subsequent radiofrequency (RF) transformations of spin order. Commercial NMR consoles are designed to synchronize applied waves on multiple channels and consequently are well-suited as controllers for these types of hyperpolarization experiments that require tight coordination of RF and non-RF events...
September 30, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28990406/in-vivo-application-of-proton-electron-double-resonance-imaging
#16
Shun Kishimoto, Murali C Krishna, Valery V Khramtsov, Hideo Utsumi, David J Lurie
SIGNIFICANCE: Proton-electron double-resonance imaging (PEDRI) employs electron paramagnetic resonance irradiation with low-field magnetic resonance imaging so that the electron spin polarization is transferred to nearby protons, resulting in higher signals. PEDRI provides information about free radical distribution and, indirectly, about the local microenvironment such as partial pressure of oxygen (pO2), tissue permeability, redox status, and acid-base balance. Recent Advances: Local acid-base balance can be imaged by exploiting the different resonance frequency of radical probes between R and RH(+) forms...
November 13, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28988468/thermal-latency-adds-to-lesion-depth-after-application-of-high-power-short-duration-radiofrequency-energy-results-of-a-computer-modeling-study
#17
Ramiro M Irastorza, Andre D'avila, Enrique Berjano
INTRODUCTION: The use of ultra-short RF pulses could achieve greater lesion depth immediately after the application of the pulse due to thermal latency. METHODS AND RESULTS: A computer model of irrigated-catheter RF ablation was built to study the impact of thermal latency on the lesion depth. The results showed that the shorter the RF pulse duration (keeping energy constant), the greater the lesion depth during the cooling phase. For instance, after a 10-s pulse, lesion depth grew from 2...
October 8, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28946529/management-of-refractory-sciatic-neuropathic-pain-using-ultrasound-guided-pulsed-radiofrequency
#18
Dong Gyu Lee, Yun Woo Cho, Kil-Ho Cho, Min Cheol Chang
BACKGROUND AND OBJECTIVE: Nowadays, pulsed radiofrequency (PRF) is being used to control several types of musculoskeletal pain. Herein, we report a successful application of ultrasound (US)-guided PRF for a patient with refractory sciatic neuropathic pain. CASE REPORT: We applied US-guided PRF to a 50-year-old man, suffering from refractory neuropathic pain on the left foot following sciatic neuropathy for a period of approximately 6 months. We performed PRF on the level of piriformis muscle because the lesion of the sciatic nerve was presented digitally from the level of piriformis muscle on the magnetic resonance images...
September 22, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28946058/radiofrequency-fields-in-mas-solid-state-nmr-probes
#19
Zdeněk Tošner, Armin Purea, Jochem O Struppe, Sebastian Wegner, Frank Engelke, Steffen J Glaser, Bernd Reif
We present a detailed analysis of the radiofrequency (RF) field over full volume of a rotor that is generated in a solenoid coil. On top of the usually considered static distribution of amplitudes along the coil axis we describe dynamic radial RF inhomogeneities induced by sample rotation. During magic angle spinning (MAS), the mechanical rotation of the sample about the magic angle, a spin packet travels through areas of different RF fields and experiences periodical modulations of both the RF amplitude and the phase...
September 6, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28942118/carpal-tunnel-syndrome-effectiveness-of-physical-therapy-and-electrophysical-modalities-an-updated-systematic-review-of-randomized-controlled-trials
#20
REVIEW
Bionka M A Huisstede, Peter Hoogvliet, Thierry P C Franke, Manon S Randsdorp, Bart W Koes
OBJECTIVE: To review scientific literature studying the effectiveness of physical therapy and electrophysical modalities for carpal tunnel syndrome (CTS). DATA SOURCES: The Cochrane Library, PubMed, EMBASE, CINAHL, and PEDro. STUDY SELECTION: Two reviewers independently applied the inclusion criteria to select potential eligible studies. DATA EXTRACTION: Two reviewers independently extracted the data and assessed the methodological quality using the Cochrane Risk of Bias Tool...
September 20, 2017: Archives of Physical Medicine and Rehabilitation
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