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Magnetic resonance physics

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https://www.readbyqxmd.com/read/28734657/exercise-performance-and-22q11-2-deletion-status-affect-quality-of-life-in-tetralogy-of-fallot
#1
Elizabeth Goldmuntz, Amy Cassedy, Laura Mercer-Rosa, Mark A Fogel, Stephen M Paridon, Bradley S Marino
OBJECTIVE: To identify mediators of health status and quality of life (QOL) in children and adolescents aged 8-18 years old following surgical repair for tetralogy of Fallot (TOF), including resource use, exercise performance, and 22q11.2 deletion status. STUDY DESIGN: We performed a corollary study to a cross-sectional analysis of subjects following repair for TOF that completed cardiac magnetic resonance imaging, cardiopulmonary exercise tests, and instruments assessing health status and QOL...
July 19, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/28734279/a-discrete-fourier-encoded-diagonal-free-experiment-to-simplify-homonuclear-2d-nmr-correlations
#2
Zebin Huang, Quanshuai Guan, Zhong Chen, Lucio Frydman, Yulan Lin
Nuclear magnetic resonance (NMR) spectroscopy has long served as an irreplaceable, versatile tool in physics, chemistry, biology, and materials sciences, owing to its ability to study molecular structure and dynamics in detail. In particular, the connectivity of chemical sites within molecules, and thereby molecular structure, becomes visible by multi-dimensional NMR. Homonuclear correlation experiments are a powerful tool for identifying coupled spins. Generally, diagonal peaks in these correlation spectra display the strongest intensities and do not offer any new information beyond the standard one-dimensional spectrum, whereas weaker, symmetrically placed cross peaks contain most of the coupling information...
July 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28732300/complete-torsion-of-gallbladder-following-laparoscopic-cholecystectomy-a-case-study
#3
Tomoaki Bekki, Tomoyuki Abe, Hironobu Amano, Nobuaki Fujikuni, Hiroshi Okuda, Tatsunari Sasada, Minoru Yamaki, Tsuyoshi Kobayashi, Toshio Noriyuki, Masahiro Nakahara
INTRODUCTION: Gallbladder torsion is mainly associated with a floating gallbladder. From an anatomical perspective, laparoscopic cholecystectomy is a more optimal treatment than open cholecystectomy. PRESENTATION OF CASE: An 84-year-old woman visited the Onomichi General Hospital because of progressive pain in the right upper quadrant of her abdomen. Physical examination revealed a positive Murphy sign and peritoneal irritation. Laboratory data demonstrated that inflammatory marker levels were increased...
June 29, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28732177/inguinal-hernia-in-athletes-role-of-dynamic-ultrasound
#4
William Kelton Vasileff, Mikhail Nekhline, Patricia A Kolowich, Gary B Talpos, Willam R Eyler, Marnix van Holsbeeck
BACKGROUND: Inguinal hernia is a commonly encountered cause of pain in athletes. Because of the anatomic complexity, lack of standard imaging, and the dynamic condition, there is no unified opinion explaining its underlying pathology. HYPOTHESIS: Athletes with persistent groin pain would have a high prevalence of inguinal hernia with dynamic ultrasound, and herniorrhaphy would successfully return athletes to activity. STUDY DESIGN: Case-control study...
July 1, 2017: Sports Health
https://www.readbyqxmd.com/read/28731693/isolable-bis-triarylamine-dications-analogues-of-thiele-s-chichibabin-s-and-m%C3%A3-ller-s-hydrocarbons
#5
Gengwen Tan, Xinping Wang
Since the pioneering work by Thiele and Chichibabin, who synthesized the first diradicals bridged by phenylene and biphenylene groups in 1904 and 1907, respectively, numerous efforts have been devoted to synthesizing stable diradicals during the last few decades, and several strategies have been developed to stabilize these highly reactive diradicals. In this Account, we describe the synthesis and characterization of isolable bis(triarylamine) dications, nitrogen analogues of Thiele's, Chichibabin's, and Müller's hydrocarbons, which represent facilely accessible, stable diradicals by replacing carbinyl centers with isoelectronic aminium centers...
July 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28730243/a-52-year-old-man-with-gouty-arthritis-and-erosive-lesion-in-the-hip
#6
Vitorino Modesto Dos Santos, Viviane Vieira Passini Soares, Priscilla Souza de Faria, Francisca Germanya Morais Borges Viana, Mayza Lemes Duarte
The case study of peripheral and axial gouty arthritis is described in a 52-year-old man without concomitant clinical evidence of tophaceus gout on physical evaluation on admission. Gout is a metabolic disorder related to excess of uric acid in the extracellular compartment, and deposition of monosodium urate crystals in the joints and other sites. Arthritis and tophi are major manifestations, which more often involve the peripheral joints asymmetrically. Chronic tophaceous gout commonly develops after a decade of recurrent polyarticular gout...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28728258/-follow-up-and-genetic-study-of-43-chinese-children-with-type-%C3%A2-alexander-disease
#7
T T Ban, Y Wu, Z B Zhang, L L Zang, J M Wang, Y W Jiang
Objective: To identify the clinical and genetic characteristics in 43 Chinese children diagnosed with type Ⅰ Alexander disease (AxD). Method: Forty-three type Ⅰ AxD cases identified by glial fibrillary acidic protein (GFAP) gene mutations in Peking University First Hospital from 2005 to 2016 were followed up. The data of medical history, physical examination and magnetic resonance imaging (MRI) were collected. All these patients were followed up in December 2010, Febury 2012, June 2014 and January 2016, respectively...
July 2, 2017: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/28727900/head-midline-position-for-preventing-the-occurrence-or-extension-of-germinal-matrix-intraventricular-hemorrhage-in-preterm-infants
#8
REVIEW
Olga Romantsik, Maria Grazia Calevo, Matteo Bruschettini
BACKGROUND: Preterm birth is known to constitute the major risk factor for development of germinal matrix-intraventricular hemorrhage (GM-IVH). Head position may affect cerebral hemodynamics and thus may be involved indirectly in development of GM-IVH. Turning the head toward one side may functionally occlude jugular venous drainage on the ipsilateral side while increasing intracranial pressure and cerebral blood volume. Thus, it has been suggested that cerebral venous pressure is reduced and hydrostatic brain drainage improved if the patient is in supine midline position with the bed tilted 30°...
July 20, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28721218/spontaneous-reossification-of-the-sella-in-transsphenoidal-reoperation-associated-with-strontium-ranelate
#9
Maria Mercedes Pineyro, Daiana Arrestia, Mariana Elhordoy, Ramiro Lima, Saul Wajskopf, Raul Pisabarro, Maria Pilar Serra
Spontaneous reossification of the sellar floor after transsphenoidal surgery has been rarely reported. Strontium ranelate, a divalent strontium salt, has been shown to increase bone formation, increasing osteoblast activity. We describe an unusual case of a young patient with Cushing's disease who was treated with strontium ranelate for low bone mass who experienced spontaneous sellar reossification after transsphenoidal surgery. A 21-year-old male presented with Cushing's features. His past medical history included delayed puberty diagnosed at 16 years, treated with testosterone for 3 years without further work-up...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/28717781/spinal-cord-infarction-mimicking-ischemic-heart-disease
#10
Dae Won Lee, Yoon Hee Choi
Spinal cord infarction is a rare condition and is easily misdiagnosed owing to its initial non-specific manifestation. We report a case of a 77-year-old man who presented with chest pain and upper back pain initially, and was misdiagnosed with a myocardial infarction. Four hours after admission, he complained of numbness in his entire left leg below the knee, with rapid deterioration of neurological symptoms. After 9 hours, loss of sensation progressed up to the T4 dermatome, strength of both lower extremities deteriorated to grade 0, and decrease in anal tone and deep tendon reflex was observed...
June 2017: Clinical and Experimental Emergency Medicine
https://www.readbyqxmd.com/read/28715518/early-accurate-diagnosis-and-early-intervention-in-cerebral-palsy-advances-in-diagnosis-and-treatment
#11
Iona Novak, Cathy Morgan, Lars Adde, James Blackman, Roslyn N Boyd, Janice Brunstrom-Hernandez, Giovanni Cioni, Diane Damiano, Johanna Darrah, Ann-Christin Eliasson, Linda S de Vries, Christa Einspieler, Michael Fahey, Darcy Fehlings, Donna M Ferriero, Linda Fetters, Simona Fiori, Hans Forssberg, Andrew M Gordon, Susan Greaves, Andrea Guzzetta, Mijna Hadders-Algra, Regina Harbourne, Angelina Kakooza-Mwesige, Petra Karlsson, Lena Krumlinde-Sundholm, Beatrice Latal, Alison Loughran-Fowlds, Nathalie Maitre, Sarah McIntyre, Garey Noritz, Lindsay Pennington, Domenico M Romeo, Roberta Shepherd, Alicia J Spittle, Marelle Thornton, Jane Valentine, Karen Walker, Robert White, Nadia Badawi
Importance: Cerebral palsy describes the most common physical disability in childhood and occurs in 1 in 500 live births. Historically, the diagnosis has been made between age 12 and 24 months but now can be made before 6 months' corrected age. Objectives: To systematically review best available evidence for early, accurate diagnosis of cerebral palsy and to summarize best available evidence about cerebral palsy-specific early intervention that should follow early diagnosis to optimize neuroplasticity and function...
July 17, 2017: JAMA Pediatrics
https://www.readbyqxmd.com/read/28714120/partial-fourier-techniques-in-single-shot-cross-term-spatiotemporal-encoded-mri
#12
Zhiyong Zhang, Lucio Frydman
PURPOSE: Cross-term spatiotemporal encoding (xSPEN) is a single-shot approach with exceptional immunity to field heterogeneities, the images of which faithfully deliver 2D spatial distributions without requiring a priori information or using postacquisition corrections. xSPEN, however, suffers from signal-to-noise ratio penalties due to its non-Fourier nature and due to diffusion losses-especially when seeking high resolution. This study explores partial Fourier transform approaches that, acting along either the readout or the spatiotemporally encoded dimensions, reduce these penalties...
July 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28713255/the-impact-of-aerobic-exercise-on-fronto-parietal-network-connectivity-and-its-relation-to-mobility-an-exploratory-analysis-of-a-6-month-randomized-controlled-trial
#13
Chun L Hsu, John R Best, Shirley Wang, Michelle W Voss, Robin G Y Hsiung, Michelle Munkacsy, Winnie Cheung, Todd C Handy, Teresa Liu-Ambrose
Impaired mobility is a major concern for older adults and has significant consequences. While the widely accepted belief is that improved physical function underlies the effectiveness of targeted exercise training in improving mobility and reducing falls, recent evidence suggests cognitive and neural benefits gained through exercise may also play an important role in promoting mobility. However, the underlying neural mechanisms of this relationship are currently unclear. Thus, we hypothesize that 6 months of progressive aerobic exercise training would alter frontoparietal network (FPN) connectivity during a motor task among older adults with mild subcortical ischemic vascular cognitive impairment (SIVCI)-and exercise-induced changes in FPN connectivity would correlate with changes in mobility...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28709153/age-reduces-microvascular-function-in-the-leg-independent-of-physical-activity
#14
Anne Tonson, Kayle E Noble, Ronald A Meyer, Mitchell R Rozman, Kevin T Foley, Jill M Slade
The microvasculature is critical in the control of blood flow. Aging and reduced physical activity (PA) may both decrease microvascular function. PURPOSE: The primary aim was to evaluate the influence of age on microvascular function in adults with similar PA levels. Secondary aims were to assess the reliability of muscle functional magnetic resonance imaging in older adults (OA) and the relationship between PA and microvascular function in OA. METHODS: Microvascular blood-oxygen-level dependent (BOLD) responses were measured in young adults (YA, n = 12, mean ± SD age = 21 ± 1 yr old, PA = 239 ± 73 × 10 counts per day) and OA (n = 13, 64 ± 4 yr old, PA = 203 ± 48 × 10 counts per day)...
August 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28706185/deep-learning-for-fully-automated-localization-and-segmentation-of-rectal-cancer-on-multiparametric-mr
#15
Stefano Trebeschi, Joost J M van Griethuysen, Doenja M J Lambregts, Max J Lahaye, Chintan Parmer, Frans C H Bakers, Nicky H G M Peters, Regina G H Beets-Tan, Hugo J W L Aerts
Multiparametric Magnetic Resonance Imaging (MRI) can provide detailed information of the physical characteristics of rectum tumours. Several investigations suggest that volumetric analyses on anatomical and functional MRI contain clinically valuable information. However, manual delineation of tumours is a time consuming procedure, as it requires a high level of expertise. Here, we evaluate deep learning methods for automatic localization and segmentation of rectal cancers on multiparametric MR imaging. MRI scans (1...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28705613/aging-related-effects-of-bed-rest-followed-by-eccentric-exercise-rehabilitation-on-skeletal-muscle-macrophages-and-insulin-sensitivity
#16
Paul T Reidy, Catherine C Lindsay, Alec I McKenzie, Christopher S Fry, Mark A Supiano, Robin L Marcus, Paul C LaStayo, Micah J Drummond
The pro- and anti-inflammatory macrophages are associated with insulin sensitivity and skeletal muscle regeneration. Infiltrating macrophages in skeletal muscle during a period of physical inactivity and subsequent reloading/rehabilitation in older adults is unknown, but may provide insight into mechanisms related to the development of metabolic disease and changes in muscle cell size. The purpose of this study was to determine if skeletal muscle macrophage infiltration is modulated differently between young and older adults after bed rest and exercise rehabilitation and if these responses are related to muscle and insulin sensitivity changes...
July 10, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28702770/oncologic-outcomes-after-treatment-for-mri-occult-breast-cancer-pt0n
#17
Damian P McCartan, Emily C Zabor, Monica Morrow, Kimberly J Van Zee, Mahmoud B El-Tamer
BACKGROUND: Studies assessing outcomes in occult breast cancer have often included women treated before the routine use of magnetic resonance imaging (MRI). This study examined outcomes for patients presenting with axillary adenopathy and no primary breast tumor detectable by MRI or other imaging methods. METHODS: All patients with axillary nodal metastases consistent with breast carcinoma and no breast primary tumor detectable by physical exam, mammography, or MRI treated between 1 January 1996 and 30 June 2011 were identified from an institutional database...
July 12, 2017: Annals of Surgical Oncology
https://www.readbyqxmd.com/read/28701206/physical-activity-level-in-people-with-age-related-white-matter-changes-correlates-to-better-motor-performance-lower-comorbidity-and-higher-cognitive-level
#18
Anna F Pettersson, Lars-Olof Wahlund, Lena Bronge, Elisabeth Olsson, Kaarina Amberla, Hansjoerg Baezner, Milita Crisby
BACKGROUND: Physical activity plays a pivotal role in the development of disability and may modify the negative effect of vascular risk factors on progression of both cardio and cerebrovascular disorders. The aim of this study was to evaluate the activity level in people with age-related white matter changes as identified on magnetic resonance imaging (MRI) in relation to motor performance, cognition and perceived health. METHODS: Data came from the first year follow up of one participating centers of the LADIS study...
July 12, 2017: BMC Geriatrics
https://www.readbyqxmd.com/read/28700982/phosphatidylcholine-specific-phospholipase-c-inhibition-reduces-her2-overexpression-cell-proliferation-and-in-vivo-tumor-growth-in-a-highly-tumorigenic-ovarian-cancer-model
#19
Luisa Paris, Franca Podo, Francesca Spadaro, Laura Abalsamo, Maria Elena Pisanu, Alessandro Ricci, Serena Cecchetti, Luisa Altabella, Maria Buoncervello, Ludmila Lozneanu, Marina Bagnoli, Carlo Ramoni, Silvana Canevari, Delia Mezzanzanica, Egidio Iorio, Rossella Canese
Antagonizing the oncogenic effects of human epidermal growth factor receptor 2 (HER2) with current anti-HER2 agents has not yet yielded major progress in the treatment of advanced HER2-positive epithelial ovarian cancer (EOC). Using preclinical models to explore alternative molecular mechanisms affecting HER2 overexpression and oncogenicity may lead to new strategies for EOC patient treatment. We previously reported that phosphatidylcholine-specific phospholipase C (PC-PLC) exerts a pivotal role in regulating HER2 overexpression in breast cancer cells...
July 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/28700967/eosinophilic-granuloma-at-the-cerebellopontine-angle-in-an-adult-a-rare-case-report-and-literature-review
#20
Arash Safarian, Nima Derakhshan, Mousa Taghipour, Amirreza Dehghanian
INTRODUCTION: Langerhans cell histiocytosis (LCH) is a rare immunologic disorder, identified by immature proliferation of histiocytes which may present as systemic or focal lesions. Eosinophilic granuloma (EG) is localized from of LCH mainly involving bones such as skull, femur, spine, ribs, mandible and pelvis. Cerebello-pontine (CP) angle is a rare anatomic location for involvement by EG. PRESENTATION OF CASE: A 32 year old man was being evaluated in our neuro-oncology clinic due to diplopia since 4 months ago...
June 29, 2017: International Journal of Surgery Case Reports
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