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https://www.readbyqxmd.com/read/28547075/comparison-of-photobiomodulation-therapy-and-suprascapular-nerve-pulsed-radiofrequency-in-chronic-shoulder-pain-a-randomized-controlled-single-blind-clinical-trial
#1
Burcu Metin Ökmen, Korgün Ökmen
Shoulder pain can be difficult to treat due to its complex anatomic structure, and different treatment methods can be used. We aimed to examine the efficacy of photobiomodulation therapy (PBMT) and suprascapular nerve (SSN)-pulsed radiofrequency (RF) therapy. In this prospective, randomized, controlled, single-blind study, 59 patients with chronic shoulder pain due to impingement syndrome received PBMT (group H) or SSN-pulsed RF therapy (group P) in addition to exercise therapy for 14 sessions over 2 weeks...
May 25, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28542010/thermal-modeling-for-the-next-generation-of-radiofrequency-exposure-limits-commentary
#2
Kenneth R Foster, Marvin C Ziskin, Quirino Balzano
This commentary evaluates two sets of guidelines for human exposure to radiofrequency (RF) energy, focusing on the frequency range above the "transition" frequency at 3-10 GHz where the guidelines change their basic restrictions from specific absorption rate to incident power density, through the end of the RF band at 300 GHz. The analysis is based on a simple thermal model based on Pennes' bioheat equation (BHTE) (Pennes 1948) assuming purely surface heating; an Appendix provides more details about the model and its range of applicability...
July 2017: Health Physics
https://www.readbyqxmd.com/read/28541590/renal-denervation-interventional-radiofrequency-treatment-of-arterial-hypertension-two-years-follow-up
#3
Krzysztof Bartus, Jerzy Sadowski, Bogusław Kapelak, Radosław Litwinowicz, Jakub Podolec, Magdalena Bartus, Artur Dziewierz, Stanislaw Bartus, Wojciech Zajdel, Dhanunjaya Lakkireddy
BACKGROUND: Arterial hypertension is one of the most common chronic disease in the Western World, affecting more than 25% of adult population. AIM: The aim of this study was to assess changes in arterial blood pressure (BP) levels in hypertensive patients, after ablation of nerve terminals in renal arteries using radiofrequency energy during 24 months follow-up. METHODS AND RESULTS: Thirty two patients with diagnosed resistant hypertension (20 men and 12 women) underwent percutaneous catheter-based renal denervation of nerve terminals in renal arteries wall...
May 25, 2017: Kardiologia Polska
https://www.readbyqxmd.com/read/28540817/effect-of-applied-voltage-duration-and-repetition-frequency-of-rf-pulses-for-pain-relief-on-temperature-spikes-and-electrical-field-a-computer-modelling-study
#4
Elżbieta Ewertowska, Borja Mercadal, Víctor Muñoz, Antoni Ivorra, Macarena Trujillo, Enrique Berjano
BACKGROUND: The thermal and electrical effects of pulsed radiofrequency (PRF) for pain relief can be controlled by modifying the characteristics of the RF pulses applied. Our goal was to evaluate the influence of such modifications on the thermal and electric performance in tissue. METHODS: A computational model was developed to compare the temperature and electric field time courses in tissue between a standard clinical protocol (45 V pulses, 20 ms duration, 2 Hz repetition frequency) and a new protocol (55 V pulses, 5 ms duration, 5 Hz repetition frequency) with a higher applied electric field but a smaller impact on temperature alterations in tissue...
May 16, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540782/computational-modelling-of-internally-cooled-wet-icw-electrodes-for-radiofrequency-ablation-impact-of-rehydration-thermal-convection-and-electrical-conductivity
#5
Macarena Trujillo, Jose Bon, Enrique Berjano
PURPOSE: (1) To analyse rehydration, thermal convection and increased electrical conductivity as the three phenomena which distinguish the performance of internally cooled electrodes (IC) and internally cooled wet (ICW) electrodes during radiofrequency ablation (RFA), (2) Implement a RFA computer model with an ICW which includes these phenomena and (3) Assess their relative influence on the thermal and electrical tissue response and on the coagulation zone size. METHODS: A 12-min RFA in liver was modelled using an ICW electrode (17 G, 3 cm tip) by an impedance-control pulsing protocol with a constant current of 1...
March 21, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28535550/high-voltage-pulsed-radiofrequency-for-the-treatment-of-refractory-neuralgia-of-the-infraorbital-nerve-a-prospective-double-blinded-randomized-controlled-study
#6
Fang Luo, Tao Wang, Ying Shen, Lan Meng, Jingjing Lu, Nan Ji
BACKGROUND: A recent study showed that 50% of patients who suffered from refractory neuralgia of the infraorbital nerve obtained satisfactory efficacy after pulsed radiofrequency (PRF) treatment. A pilot study showed that increasing the output voltage of PRF significantly improved the efficacy for trigeminal neuralgia; however, whether increasing the output voltage of PRF can improve the treatment outcomes for neuralgia of the infraorbital nerve is unknown. OBJECTIVE: To evaluate the efficacy and safety of high voltage PRF treatment in comparison with standard voltage PRF for neuralgia of the infraorbital nerve...
May 2017: Pain Physician
https://www.readbyqxmd.com/read/28527462/low-power-broadband-solid-state-mas-nmr-of-14-n
#7
Andrew J Pell, Kevin J Sanders, Sebastian Wegner, Guido Pintacuda, Clare P Grey
We propose two broadband pulse schemes for (14)N solid-state magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) that achieves (i) complete population inversion and (ii) efficient excitation of the double-quantum spectrum using low-power single-sideband-selective pulses. We give a comprehensive theoretical description of both schemes using a common framework that is based on the jolting-frame formalism of Caravatti et al. [J. Magn. Reson. 55, 88 (1983)]. This formalism is used to determine for the first time that we can obtain complete population inversion of (14)N under low-power conditions, which we do here using single-sideband-selective adiabatic pulses...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28521010/prospective-audit-of-a-pathway-for-in-patient-pain-management-of-chronic-abdominal-pain-a-novel-and-cost-effective-strategy
#8
Gopinath Niraj, Sanjay Chaudhri
Background.:  Unexplained abdominal pain is a common cause of hospital admission and utilizes significant resource. Current in-patient pain management of acute exacerbation of chronic abdominal pain is primarily directed at pharmacological and psychological management strategies in this group of complex patients. We adopted a novel approach that proved to be both clinically effective and cost-effective. Design.:  Adult patients admitted to a surgical ward with acute exacerbation of chronic abdominal pain referred to in-patient pain management were prospectively audited over a two-year period at a single tertiary centre...
May 17, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28516482/multiple-boli-arterial-spin-labeling-for-high-signal-to-noise-rodent-brain-perfusion-imaging
#9
Antoine Vallatos, Lesley Gilmour, Anthony J Chalmers, William M Holmes
PURPOSE: A systematic method is proposed for optimizing a promising preclinical arterial spin labeling (ASL) sequence based on the use of a train of adiabatic radiofrequency pulses labeling successive boli of blood water. METHODS: The sequence optimization is performed and evaluated using brain imaging experiments in mice and in rats. It involves the investigation of several parameters, ranging from the number of adiabatic pulses and labeling duration to the properties of the adiabatic hyperbolic secant pulses (ie, amplitude and frequency modulation)...
May 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28515409/saturation-recovery-myocardial-t1-mapping-with-a-composite-radiofrequency-pulse-on-a-3t-mr-imaging-system
#10
Kosuke Morita, Seitaro Oda, Daisuke Utsunomiya, Takeshi Nakaura, Takatoshi Matsubara, Makoto Goto, Tomoyuki Okuaki, Hideaki Yuki, Yasunori Nagayama, Masafumi Kidoh, Kenichiro Hirata, Yuij Iyama, Narumi Taguchi, Masahiro Hatemura, Masahiro Hashida, Yasuyuki Yamashita
PURPOSE: To evaluate the effect of a composite radiofrequency (RF) pulse on saturation recovery (SR) myocardial T1 mapping using a 3T magnetic resonance (MR) system. MATERIALS AND METHODS: Phantom and in vivo studies were performed with a clinical 3T MR scanner. Accuracy and reproducibility of the SR T1 mapping using conventional and composite RF pulses were first compared in phantom experiments. An in vivo study was performed of 10 healthy volunteers who were imaged with conventional and composite RF pulse methods twice each...
May 18, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28504324/electromagnetic-fields-pulsed-radiofrequency-radiation-and-epigenetics-how-wireless-technologies-may-affect-childhood-development
#11
Cindy Sage, Ernesto Burgio
Mobile phones and other wireless devices that produce electromagnetic fields (EMF) and pulsed radiofrequency radiation (RFR) are widely documented to cause potentially harmful health impacts that can be detrimental to young people. New epigenetic studies are profiled in this review to account for some neurodevelopmental and neurobehavioral changes due to exposure to wireless technologies. Symptoms of retarded memory, learning, cognition, attention, and behavioral problems have been reported in numerous studies and are similarly manifested in autism and attention deficit hyperactivity disorders, as a result of EMF and RFR exposures where both epigenetic drivers and genetic (DNA) damage are likely contributors...
May 15, 2017: Child Development
https://www.readbyqxmd.com/read/28497465/designing-3d-selective-adiabatic-radiofrequency-pulses-with-single-and-parallel-transmission
#12
Albert Jang, Xiaoping Wu, Edward J Auerbach, Michael Garwood
PURPOSE: To introduce a method of designing single and parallel transmit (pTx) 3D adiabatic π pulses for inverting and refocusing spins that are insensitive to transmit B1 ( B1+) inhomogeneity. THEORY AND METHODS: A 3D adiabatic pulse is created by replacing each piece-wise constant element (or sub-pulse) of an adiabatic full passage (AFP) by a 2D selective pulse. In this study, the parent AFP is an HS1 and each sub-pulse is a 2D pulse derived from a jinc function designed using a spiral k-trajectory...
May 12, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28492049/a-review-of-laser-and-light-therapy-in-melasma
#13
REVIEW
M K Trivedi, F C Yang, B K Cho
Melasma is a dysregulation of the homeostatic mechanisms that control skin pigmentation and excess pigment is produced. Traditional treatment approaches with topical medications and chemical peels are commonly used but due to the refractory and recurrent nature of melasma, patients often seek alternative treatment strategies such as laser and light therapy. Several types of laser and light therapy have been studied in the treatment of melasma. Intense pulsed light, low fluence Q-switched lasers, and non-ablative fractionated lasers are the most common lasers and light treatments that are currently performed...
March 2017: International Journal of Women's Dermatology
https://www.readbyqxmd.com/read/28489309/isotropic-three-dimensional-t2-mapping-of-knee-cartilage-development-and-validation
#14
Roberto Colotti, Patrick Omoumi, Gabriele Bonanno, Jean-Baptiste Ledoux, Ruud B van Heeswijk
PURPOSE: 1) To implement a higher-resolution isotropic 3D T2 mapping technique that uses sequential T2 -prepared segmented gradient-recalled echo (Iso3DGRE) images for knee cartilage evaluation, and 2) to validate it both in vitro and in vivo in healthy volunteers and patients with knee osteoarthritis. MATERIALS AND METHODS: The Iso3DGRE sequence with an isotropic 0.6 mm spatial resolution was developed on a clinical 3T MR scanner. Numerical simulations were performed to optimize the pulse sequence parameters...
May 10, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28488223/ultrasonic-identification-of-pump-twin-by-dual-gate-doppler-in-a-monochorionic-triamniotic-triplet-twin-reversed-arterial-perfusion-sequence-before-preventative-radiofrequency-ablation-a-case-report
#15
Yuichiro Takahashi, Shigenori Iwagaki, Rika Chiaki, Kazuhiko Asai, Masako Matsui, Ichiro Kawabata
We performed a dual-gate Doppler examination for a twin reversed arterial perfusion (TRAP) sequence in a monochorionic-triamniotic triplet pregnancy at 16 weeks of gestation and were able to identify the pump twin by arterial pulse rate synchronicity. We performed radiofrequency ablation to coagulate blood flow in the acardius at 16 weeks of gestation without any postoperative complication. At 29 weeks of gestation, we performed a cesarean section due to preterm rupture of the membranes and the patient delivered 1167/1237-g female neonates and a macerated acardius...
May 9, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28481080/quantitative-molecular-imaging-with-a-single-gd-based-contrast-agent-reveals-specific-tumor-binding-and-retention-in-vivo
#16
Mette L Johansen, Ying Gao, Melanie A Hutnick, Sonya E L Craig, Jonathan K Pokorski, Chris A Flask, Susann M Brady-Kalnay
Magnetic resonance imaging (MRI) has become an indispensable tool in the diagnosis and treatment of many diseases, especially cancer. However, the poor sensitivity of MRI relative to other imaging modalities, such as PET, has hindered the development and clinical use of molecular MRI contrast agents that could provide vital diagnostic information by specifically locating a molecular target altered in the disease process. This work describes the specific and sustained in vivo binding and retention of a protein tyrosine phosphatase mu (PTPμ)-targeted, molecular magnetic resonance (MR) contrast agent with a single gadolinium (Gd) chelate using a quantitative MRI T1 mapping technique in glioma xenografts...
May 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28466552/greater-occipital-nerve-treatment-in-the-management-of-spontaneous-intracranial-hypotension-headache-a-case-report
#17
G Niraj, Peter Critchley, Mahesh Kodivalasa, Mohammed Dorgham
BACKGROUND: Clinical presentation of spontaneous intracranial hypotension headache (SIHH) has similarities with postdural puncture headache (PDPH). Recommended treatment for both conditions is an epidural blood patch. Successful outcomes following greater occipital nerve blocks have been reported in the management of PDPH. We present the first report of greater occipital nerve treatment in SIHH. METHODS: A 40-year-old male presented with a 2-year history of daily postural headaches having a significant impact on quality of life...
May 2, 2017: Headache
https://www.readbyqxmd.com/read/28448235/intracranial-artery-steno-occlusion-diagnosis-by-using-three-dimensional-parallel-multichannel-transmission-mr-imaging
#18
Mi Sun Chung, Seung Chai Jung, Seon-Ok Kim, Ho Sung Kim, Choong Gon Choi, Sang Joon Kim, Sun U Kwon, Dong-Wha Kang, Jong S Kim
Purpose To determine whether magnetic resonance (MR) imaging by using two-dimensional spatially selective radiofrequency (RF) excitation pulses (zoomed MR imaging) is a reliable method for the diagnosis of intracranial artery steno-occlusion compared with full-field-of-view (FOV) MR imaging. Materials and Methods The institutional review board approved this retrospective study and informed consent was waived. From December 2014 to August 2015, 88 patients who underwent both full-FOV MR imaging and zoomed MR imaging for further evaluation of intracranial artery steno-occlusion at prior luminal evaluation were included...
April 27, 2017: Radiology
https://www.readbyqxmd.com/read/28445252/irreversible-electroporation-in-primary-and-metastatic-hepatic-malignancies-a-review
#19
Tianchu Lyu, Xifu Wang, Zhanliang Su, Junjie Shangguan, Chong Sun, Matteo Figini, Jian Wang, Vahid Yaghmai, Andrew C Larson, Zhuoli Zhang
BACKGROUND: Liver cancer makes up a huge percentage of cancer mortality worldwide. Irreversible electroporation (IRE) is a relatively new minimally invasive nonthermal ablation technique for tumors that applies short pulses of high frequency electrical energy to irreversibly destabilize cell membrane to induce tumor cell apoptosis. METHODS: This review aims to investigate the studies regarding the use of IRE treatment in liver tumors and metastases to liver. We searched PubMed for all of IRE relevant English language articles published up to September 2016...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28440249/innovations-in-pediatric-cataract-surgery
#20
Sudarshan Kumar Khokhar, Ganesh Pillay, Esha Agarwal, Manish Mahabir
Advances in technology have made surgery in children safer and faster. The management of pediatric cataract has made rapid progress in the past decade with the availability of safer anesthesia, newer technique's, more predictable intraocular lens (IOL) power calculation, a better understanding of neurobiology, genetics, amblyopia management, improved IOL designs for preventing visual axis opacification, and adjuvant postoperative care. Modern vitrectomy machines with minimally invasive instruments, radiofrequency, diathermy, and plasma blades help immensely in complicated cases...
March 2017: Indian Journal of Ophthalmology
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