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https://www.readbyqxmd.com/read/28815459/a-roadmap-for-reducing-cardiac-device-infections-a-review-of-epidemiology-pathogenesis-and-actionable-risk-factors-to-guide-the-development-of-an-infection-prevention-program-for-the-electrophysiology-laboratory
#1
REVIEW
Westyn Branch-Elliman
PURPOSE OF REVIEW: Cardiovascular implantable electronic device (CIED) infections are highly morbid, common, and costly, and rates are increasing (Sohail et al. Arch Intern Med 171(20):1821-8 2011; Voigt et al. J Am Coll Cardiol 48(3):590-1 2006). Factors that contribute to the development of CIED infections include patient factors (comorbid conditions, self-care, microbiome), procedural details (repeat procedure, contamination during procedure, appropriate pre-procedural prep, and antimicrobial use), environmental and organizational factors (patient safety culture, facility barriers, such as lack of space to store essential supplies, quality of environmental cleaning), and microbial factors (type of organism, virulence of organism)...
August 16, 2017: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/28812315/metabolite-cycled-steam-and-semi-laser-localization-for-mr-spectroscopy-of-the-human-brain-at-9-4t
#2
Ioannis-Angelos Giapitzakis, Tingting Shao, Nikolai Avdievich, Ralf Mekle, Roland Kreis, Anke Henning
PURPOSE: Metabolite cycling (MC) is an MRS technique for the simultaneous acquisition of water and metabolite spectra that avoids chemical exchange saturation transfer effects and for which water may serve as a reference signal or contain additional information in functional or diffusion studies. Here, MC was developed for human investigations at ultrahigh field. METHODS: MC-STEAM and MC-semi-LASER are introduced at 9.4T with an optimized inversion pulse and elaborate coil setup...
August 15, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28812309/murine-pulmonary-imaging-at-7t-t2-and-t1-with-anisotropic-ute
#3
Jinbang Guo, Xuefeng Cao, Zackary I Cleveland, Jason C Woods
PURPOSE: To measure the T2* and T1 of mouse lung at 7T via anisotropic-resolution radial ultrashort echo-time imaging with ellipsoidal k-space coverage. METHODS: Ellipsoidal field-of-view was created by expanding uniform spherical k-space coverage. The effects of T2* and ellipsoidal sampling on image resolution were investigated by using point-spread-function analysis and resolution phantoms. Finally, this ellipsoidal sampling approach was used to measure the lung T2* and T1 of healthy C57BL/6 mice at the increasingly common preclinical field strength of 7T...
August 15, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28805911/effects-of-post-weaning-growth-rate-and-puberty-induction-protocol-on-reproductive-performance-of-bos-indicus-influenced-beef-heifers
#4
P Moriel, P Lancaster, G C Lamb, J M B Vendramini, J D Arthington
A 3-yr study evaluated the effectiveness of puberty induction using exogenous reproductive hormones in beef heifers undergoing different post-weaning growth rates. On d 0 of each year, grazing Angus × Brahman heifers (60 heifers/yr) were stratified by initial BW and age (BW = 253 ± 30 kg; age = 310 ± 18 d), and randomly assigned, in a 3 × 2 factorial design, to achieve a low (LOW; 0.45 kg/d), medium (MED; 0.73 kg/d), or high (HIGH; 1.00 kg/d) growth rate from d 0 to 168 (5 heifers/pasture; 4 pastures/growth rate/yr)...
August 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28804918/low-rank-approximation-methods-for-mr-fingerprinting-with-large-scale-dictionaries
#5
Mingrui Yang, Dan Ma, Yun Jiang, Jesse Hamilton, Nicole Seiberlich, Mark A Griswold, Debra McGivney
PURPOSE: This work proposes new low rank approximation approaches with significant memory savings for large scale MR fingerprinting (MRF) problems. THEORY AND METHODS: We introduce a compressed MRF with randomized singular value decomposition method to significantly reduce the memory requirement for calculating a low rank approximation of large sized MRF dictionaries. We further relax this requirement by exploiting the structures of MRF dictionaries in the randomized singular value decomposition space and fitting them to low-degree polynomials to generate high resolution MRF parameter maps...
August 13, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28799210/whole-brain-arteriography-and-venography-using-improved-velocity-selective-saturation-pulse-trains
#6
Wenbo Li, Feng Xu, Michael Schär, Jing Liu, Taehoon Shin, Yansong Zhao, Peter C M van Zijl, Bruce A Wasserman, Ye Qiao, Qin Qin
PURPOSE: To develop velocity-selective (VS) MR angiography (MRA) protocols for arteriography and venography with whole-brain coverage. METHODS: Tissue suppression using velocity-selective saturation (VSS) pulse trains is sensitive to radiofrequency field (B1 +) inhomogeneity. To reduce its sensitivity, we replaced the low-flip-angle hard pulses in the VSS pulse train with optimal composite (OCP) pulses. Additionally, new pulse sequences for arteriography and venography were developed by placing spatially selective inversion pulses with a delay to null signals from either venous or arterial blood...
August 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28796368/regularly-incremented-phase-encoding-mr-fingerprinting-ripe-mrf-for-enhanced-motion-artifact-suppression-in-preclinical-cartesian-mr-fingerprinting
#7
Christian E Anderson, Charlie Y Wang, Yuning Gu, Rebecca Darrah, Mark A Griswold, Xin Yu, Chris A Flask
PURPOSE: The regularly incremented phase encoding-magnetic resonance fingerprinting (RIPE-MRF) method is introduced to limit the sensitivity of preclinical MRF assessments to pulsatile and respiratory motion artifacts. METHODS: As compared to previously reported standard Cartesian-MRF methods (SC-MRF), the proposed RIPE-MRF method uses a modified Cartesian trajectory that varies the acquired phase-encoding line within each dynamic MRF dataset. Phantoms and mice were scanned without gating or triggering on a 7T preclinical MRI scanner using the RIPE-MRF and SC-MRF methods...
August 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28795419/simultaneous-mr-thermometry-and-acoustic-radiation-force-imaging-using-interleaved-acquisition
#8
Joshua T de Bever, Henrik Odéen, Lorne W Hofstetter, Dennis L Parker
PURPOSE: A novel and practical method for simultaneously performing MR acoustic radiation force imaging (ARFI) and proton resonance frequency (PRF)-shift thermometry has been developed and tested. This could be an important tool for evaluating the success of MR-guided focused ultrasound procedures for which MR-thermometry measures temperature and thermal dose and MR-ARFI detects changes in tissue mechanical properties. METHODS: MR imaging was performed using a gradient recalled echo segmented echo-planar imaging pulse sequence with bipolar motion encoding gradients (MEG)...
August 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28782337/diagnosis-management-and-prevention-of-hepatitis-c-in-pakistan-2017
#9
Muhammad Umar, Hamama-Tul-Bushra Khaar, Tayyab Saeed Akhter, Faiza Aslam, Syed Irfan Ahmad, Rai Mohammad Asghar, Mohammad Khurram, Tassawar Hussain, Amjad Salamat, Anwar A Khan, Fazal-E-Hadi, Zahid Mahmood Minhas, Hasnain Ali Shah, Javed Farooqui, Asif Abbas Naqvi, Aftab Mohsin, Waseem-Ud-Din, Sohail Iqbal Bhutta, Sibt Ul Hasnain Syed, Saleem Qureshi, Tashfeen Adam, Moazzam Uddin, Ghias-U-Nabi Tayyab, Najeeb Ul Haq, Atifa Shoaib, Saima Ambreen, Arslan Shahzad, Nadeem Ikram, Gul Nisar, Mohammad Mujeeb Khan, Mohammad Osama
Aims and Objectives: Since the advent of direct acting antiviral agents, there is a revolutionary change in the management of HCV infection. Newer drugs with different mechanism of action are being introduced and are expected to be available in coming few months in Pakistan as well. The main purpose of the guideline is to review and induct the latest research in field of HCV infection in Pakistani perspective so that our healthcare professionals can apply the new recommendations in timely and judicial manner...
October 2016: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/28782173/silent-navigator-triggered-silent-mri-of-the-abdomen
#10
Yuji Iwadate, Atsushi Nozaki, Yoshinobu Nunokawa, Shigeo Okuda, Masahiro Jinzaki, Hiroyuki Kabasawa
PURPOSE: To develop and demonstrate the feasibility of a silent respiratory navigator technique for prospective triggering, which was incorporated into a three-dimensional radial zero-echo-time sequence for respiratory navigated silent abdominal imaging. METHODS: A nonselective hard excitation radiofrequency pulse was used for the navigator sequence with a derated readout gradient, to avoid generation of high levels of acoustic noise. The acquired navigator signals were processed in real time and used for prospective triggering of the zero-echo-time sequence...
August 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28782150/mri-assessment-of-coronary-microvascular-endothelial-nitric-oxide-synthase-function-using-myocardial-t1-mapping
#11
Sophia X Cui, Frederick H Epstein
PURPOSE: Endothelial nitric oxide synthase (eNOS) plays a central role in regulating vascular tone, blood flow, and microvascular permeability. Endothelial dysfunction, including eNOS dysfunction, is an early biomarker of vascular disease. This study aimed to show that myocardial T1 mapping during nitric oxide synthase (NOS) inhibition could assess coronary microvascular eNOS function. METHODS: Wild-type mice, eNOS(-/-) mice, and wild-type mice fed a high-fat diet underwent T1 mapping at baseline and for 20 min after injection of N(G) -nitro-L-arginine methyl ester (LNAME), a NOS inhibitor...
August 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28782129/volumetric-mri-thermometry-using-a-three-dimensional-stack-of-stars-echo-planar-imaging-pulse-sequence
#12
Sumeeth V Jonathan, William A Grissom
PURPOSE: To measure temperature over a large brain volume with fine spatiotemporal resolution. METHODS: A three-dimensional stack-of-stars echo-planar imaging sequence combining echo-planar imaging and radial sampling with golden angle spacing was implemented at 3T for proton resonance frequency-shift temperature imaging. The sequence acquires a 188x188x43 image matrix with 1.5x1.5x2.75 mm(3) spatial resolution. Temperature maps were reconstructed using sensitivity encoding (SENSE) image reconstruction followed by the image domain hybrid method, and using the k-space hybrid method...
August 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28781213/quality-of-life-and-sexual-function-benefits-of-long-term-testosterone-treatment-longitudinal-results-from-the-registry-of-hypogonadism-in-men-rhyme
#13
Raymond C Rosen, Frederick Wu, Hermann M Behre, Hartmut Porst, Eric J H Meuleman, Mario Maggi, Javier Romero-Otero, Juan I Martinez-Salamanca, Thomas Hugh Jones, Frans M J Debruyne, Karl-Heinz Kurth, Geoff I Hackett, Richard Quinton, Peter Stroberg, Yacov Reisman, Edoardo S Pescatori, Antonio Morales, Lluis Bassas, Natalio Cruz, Glenn R Cunningham, Olivia A Wheaton
BACKGROUND: The benefits and risks of long-term testosterone administration have been a topic of much scientific and regulatory interest in recent years. AIM: To assess long-term quality of life (QOL) and sexual function benefits of testosterone replacement therapy (TRT) prospectively in a diverse, multinational cohort of men with hypogonadism. METHODS: A multinational patient registry was used to assess long-term changes associated with TRT in middle-age and older men with hypogonadism...
August 3, 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28776754/quantitative-two-dimensional-ultrashort-echo-time-magnetization-transfer-2d-ute-mt-imaging-of-cortical-bone
#14
Ya-Jun Ma, Anthony Tadros, Jiang Du, Eric Y Chang
PURPOSE: To investigate quantitative 2D ultrashort echo time magnetization transfer (UTE-MT) imaging in ex vivo bovine cortical bone and in vivo human tibial cortical bone. METHODS: Data were acquired from five fresh bovine cortical bone samples and five healthy volunteer tibial cortical bones using a 2D UTE-MT sequence on a clinical 3T scanner. The 2D UTE-MT sequence used four or five MT powers with five frequency offsets. Results were analyzed with a two-pool quantitative MT model, providing measurements of macromolecular fraction (f), macromolecular proton transverse relaxation times (T2m ), proton exchange rates from water/macromolecular to the macromolecular/water pool (RM0m /RM0w ), and spin-lattice relaxation rate of water pool (R1w )...
August 3, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28771867/motion-corrected-k-space-reconstruction-for-interleaved-epi-diffusion-imaging
#15
Zijing Dong, Fuyixue Wang, Xiaodong Ma, Erpeng Dai, Zhe Zhang, Hua Guo
PURPOSE: To develop a new approach to correct for physiological and macroscopic motion in multishot, interleaved echo-planar diffusion imaging. THEORY: This work built on the previous SPIRiT (iterative self-consistent parallel imaging reconstruction) based reconstruction for physiological motion correction in multishot diffusion-weighted imaging to account for macroscopic motion. In-plane rotation, translation correction, data rejection, and weighted combination are integrated in SPIRiT-based reconstruction to correct for ghosting artifacts, blurring, altered b-matrix, and residual artifacts caused by motion...
August 3, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28771792/diaphragm-position-can-be-accurately-estimated-from-the-scattering-of-a-parallel-transmit-rf-coil-at-7-t
#16
Aaron T Hess, Elizabeth M Tunnicliffe, Christopher T Rodgers, Matthew D Robson
PURPOSE: To evaluate the use of radiofrequency scattering of a parallel transmit coil to track diaphragm motion. METHODS: Measurements made during radiofrequency excitation on an 8-channel parallel transmit coil by the directional couplers of the radiofrequency safety monitor were combined and converted into diaphragm position. A 30-s subject-specific calibration with an MRI navigator was used to determine a diaphragm estimate from each directional-coupler measure...
August 3, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28768550/abuse-and-disrespect-in-childbirth-process-and-abortion-situation-in-latin-america-and-the-caribbean-systematic-review-protocol
#17
Sofia Madeira, Vicky Pileggi, João Paulo Souza
BACKGROUND: Studies show that a large number of women around the world have experienced situations of abuse, disrespect, abuse, and neglect during childbirth and/or abortion. This violence is a serious violation of the rights of women, especially because it is a period in which the woman is more physiologically, socially, and psychologically vulnerable. Although this type of violence is known, there is still no international consensus on the definition of such violence and its prevalence is not known...
August 3, 2017: Systematic Reviews
https://www.readbyqxmd.com/read/28766824/ekg-based-detection-of-deep-brain-stimulation-in-fmri-studies
#18
Eric Fiveland, Radhika Madhavan, Julia Prusik, Renee Linton, Marisa Dimarzio, Jeffrey Ashe, Julie Pilitsis, Ileana Hancu
PURPOSE: To assess the impact of synchronization errors between the assumed functional MRI paradigm timing and the deep brain stimulation (DBS) on/off cycling using a custom electrocardiogram-based triggering system METHODS: A detector for measuring and predicting the on/off state of cycling deep brain stimulation was developed and tested in six patients in office visits. Three-electrode electrocardiogram measurements, amplified by a commercial bio-amplifier, were used as input for a custom electronics box (e-box)...
August 2, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28765667/the-relationship-between-physical-activity-and-work-ability-a-cross-sectional-study-of-teachers
#19
Małgorzata Grabara, Agnieszka Nawrocka, Aneta Powerska-Didkowska
OBJECTIVES: To assess relationship between physical activity (PA) and perceived work ability amongst teachers from the Upper Silesia, Poland. MATERIAL AND METHODS: The study involved 171 teachers (129 women, 42 men) of primary and secondary schools of the Upper Silesia, Poland. Physical education teachers were excluded from the study. The level of PA was estimated using the International Physical Activity Questionnaire short version, and perceived work ability was estimated using Work Ability Index (WAI)...
August 2, 2017: International Journal of Occupational Medicine and Environmental Health
https://www.readbyqxmd.com/read/28762243/quantitative-susceptibility-mapping-report-from-the-2016-reconstruction-challenge
#20
Christian Langkammer, Ferdinand Schweser, Karin Shmueli, Christian Kames, Xu Li, Li Guo, Carlos Milovic, Jinsuh Kim, Hongjiang Wei, Kristian Bredies, Sagar Buch, Yihao Guo, Zhe Liu, Jakob Meineke, Alexander Rauscher, José P Marques, Berkin Bilgic
PURPOSE: The aim of the 2016 quantitative susceptibility mapping (QSM) reconstruction challenge was to test the ability of various QSM algorithms to recover the underlying susceptibility from phase data faithfully. METHODS: Gradient-echo images of a healthy volunteer acquired at 3T in a single orientation with 1.06 mm isotropic resolution. A reference susceptibility map was provided, which was computed using the susceptibility tensor imaging algorithm on data acquired at 12 head orientations...
July 31, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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