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Clinical Densitometry

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https://www.readbyqxmd.com/read/28221141/-etiopathogenic-factors-of-the-different-types-of-urinary-litiasis
#1
Miguel Arrabal-Martín, María Carmen Cano-García, Miguel Ángel Arrabal-Polo, Alejandro Domínguez-Amillo, Nelson Canales-Casco, Javier de la Torre-Trillo, José Manuel Cózar-Olmo
In this review, we analyze the etiopathogenic principles of urinary lithiasis formation. In the kidney, calcifications that may cause renal lithiasis are produced as a consequence of processes that injury the urothelium at the papilla and Bellini's ducts. With the improvement of imaging techniques, mainly micro CT scan, it is possible to detect them and we may be able to anticipate to the formation of lithiasis. As we well know, there are different factors that influence the formation of the calculi depending on their composition...
January 2017: Archivos Españoles de Urología
https://www.readbyqxmd.com/read/28159711/quality-in-dual-energy-x-ray-absorptiometry-scans
#2
Sarah L Morgan, Ginnie L Prater
Dual-energy X-ray absorptiometry (DXA) is the gold standard for measuring bone mineral density (BMD), making the diagnosis of osteoporosis, and for monitoring changes in BMD over time. DXA data are also used in the determination of fracture risk. Procedural steps in DXA scanning can be broken down into scan acquisition, analysis, interpretation, and reporting. Careful attention to quality control pertaining to these procedural steps should theoretically be beneficial in patient management. Inattention to procedural steps and errors that may occur at each step has the possibility of providing information that would inform inappropriate clinical decisions, generating unnecessary healthcare expenses and ultimately causing avoidable harm to patients...
January 31, 2017: Bone
https://www.readbyqxmd.com/read/28159459/osteoporosis-in-stickler-syndrome-a-new-family-case-with-bone-histology-study
#3
P Insalaco, E Legrand, B Bouvard, M Audran
The Stickler syndrome (SS) has been described as a "hereditary progressive arthro-ophtalmopathy" by Stickler in 1965, due to mutations on the collagen genes. Currently about 40 different genes have been identified which encode for at least 27 different collagens. The majority of mutations occur in the COL2A1 gene on chromosome 12q13 (SS type I). Mutations in COL11A1 are less frequent (SS type II). More recently, mutations in COL11A2 and in the COL9A1 gene have been reported with particular phenotypes. The main features of this autosomal inherited disease are ocular, auditory with orofacial abnormalities and early-onset osteoarthritis...
January 31, 2017: Morphologie: Bulletin de L'Association des Anatomistes
https://www.readbyqxmd.com/read/28149545/segmental-bronchi-collapsibility-computed-tomography-based-quantification-in-patients-with-chronic-obstructive-pulmonary-disease-and-correlation-with-emphysema-phenotype-corresponding-lung-volume-changes-and-clinical-parameters
#4
Christopher Kloth, Wolfgang Maximilian Thaiss, Hendrik Ditt, Jürgen Hetzel, Eva Schülen, Konstantin Nikolaou, Marius Horger
BACKGROUND: Global pulmonary function tests lack region specific differentiation that might influence therapy in severe chronic obstructive pulmonary disease (COPD) patients. Therefore, the aim of this work was to assess the degree of expiratory 3(rd) generation bronchial lumen collapsibility in patients with severe COPD using chest-computed tomography (CT), to evaluate emphysema-phenotype, lobar volumes and correlate results with pulmonary function tests. METHODS: Thin-slice chest-CTs acquired at end-inspiration & end-expiration in 42 COPD GOLD IV patients (19 females, median-age: 65...
December 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28112361/modulation-of-mmp-2-and-mmp-9-secretion-by-cytokines-inducers-and-inhibitors-in-human-glioblastoma-t-98g-cells
#5
M Waheed Roomi, Tatiana Kalinovsky, Matthias Rath, Aleksandra Niedzwiecki
Brain tumors are highly aggressive, characterized by the secretion of high levels of matrix metalloproteinase (MMP)-2 and MMP-9 that degrade the extracellular matrix and basement membrane, allowing cancer cells to spread to distal organs. Various cytokines, mitogens, growth factors, inducers and inhibitors control MMP activity. We investigated the roles of these in the regulation of MMP-2 and MMP-9 in human glioblastoma T-98G cells. Human T-98G cells were grown in DME supplemented with 15% fetal bovine serum and antibiotics in 24-well tissue culture plates...
January 19, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28109043/angiographic-assessment-of-aortic-regurgitation-by-video-densitometry-in-the-setting-of-tavi-echocardiographic-and-clinical-correlates
#6
Mohammad Abdelghani, Hiroki Tateishi, Yosuke Miyazaki, Rafael Cavalcante, Osama I I Soliman, Jan G Tijssen, Robbert J de Winter, Jan Baan, Yoshinobu Onuma, Carlos M Campos, Rogério S Leite, José A Mangione, Alexandre Abizaid, Pedro A Lemos, Fabio S de Brito, Patrick W Serruys
OBJECTIVES: We sought to investigate a new angiographic method for aortic regurgitation (AR) severity assessment in the setting of transcatheter aortic valve implantation (TAVI). BACKGROUND: AR after TAVI is common but challenging to quantitate, especially in the cath-lab. METHODS: In 228 patients, AR was quantitated before and after TAVI by echocardiography and by video-densitometric analysis of aortograms. Contrast time-density curves for the aortic root (the reference region) and the left ventricular outflow tract, LVOT were generated...
January 21, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28069281/-effect-of-donor-graft-characteristics-on-clinical-outcomes-in-descemet-stripping-automated-endothelial-keratoplasty-dsaek
#7
G Ho Wang Yin, M Sampo, S Soare, L Hoffart
INTRODUCTION: The purpose of our study was to evaluate the progression of lamellar corneal grafts after endothelial keratoplasty by Descemet stripping automated endothelial keratoplasty (DSAEK) and the effect of their characteristics on the clinical and functional results. MATERIALS AND METHODS: This was a prospective study in which 74 patients who had undergone endothelial keratoplasty by DSAEK were included. The corneal grafts were obtained from a French tissue bank and were delivered in a preservation medium containing a deturgescent agent (Corneajet(®) or Stemalpha 3(®))...
January 6, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28068441/changes-in-astigmatism-densitometry-and-aberrations-after-smile-for-low-to-high-myopic-astigmatism-a-12-month-prospective-study
#8
Iben Bach Pedersen, Anders Ivarsen, Jesper Hjortdal
PURPOSE: To evaluate 12-month changes in refraction, visual outcome, corneal densitometry, and postoperative aberrations after small incision lenticule extraction (SMILE) for myopic astigmatism. METHODS: This 12-month prospective clinical trial comprised 101 eyes (101 patients) treated with SMILE for myopic astigmatism with cylinder of 0.75 to 4.00 diopters (D). The preoperative, 1-week, and 1-, 3-, 6-, 9-, and 12-month examinations included measurement of manifest refraction, uncorrected distance visual acuity (UDVA), and corrected (CDVA) distance visual acuity...
January 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28055279/salivary-protein-changes-in-response-to-acute-stress-in-medical-residents-performing-advanced-clinical-simulations-a-pilot-proteomics-study
#9
Rachel K Marvin, Muncharie B Saepoo, Simiao Ye, Donald B White, Rong Liu, Kenneth Hensley, Paul Rega, Viviane Kazan, David R Giovannucci, Dragan Isailovic
CONTEXT: Quantitative changes of salivary proteins due to acute stress were detected. OBJECTIVE: To explore protein markers of stress in saliva of eight medical residents who performed emergency medicine simulations. MATERIALS AND METHODS: Saliva was collected before the simulations, after the simulations, and following morning upon waking. Proteins were separated by SDS-PAGE, identified by MS, and relatively quantified by densitometry. RESULTS: Salivary alpha-amylase and S-type cystatins significantly increased, while the ∼26 kDa and low-molecular weight (<10 kDa) SDS-PAGE bands exhibited changes after stress...
January 5, 2017: Biomarkers: Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals
https://www.readbyqxmd.com/read/27995940/precision-of-dual-energy-x-ray-absorptiometry-of-the-knee-and-heel-methodology-and-implications-for-research-to-reduce-bone-mineral-loss-after-spinal-cord-injury
#10
W T Peppler, W J Kim, K Ethans, K C Cowley
STUDY DESIGN: Methodological validation of dual-energy x-ray absorptiometry (DXA)-based measures of leg bone mineral density (BMD) based on the guidelines of the International Society for Clinical Densitometry. OBJECTIVES: The primary objective of this study was to determine the precision of BMD estimates at the knee and heel using the manufacturer provided DXA acquisition algorithm. The secondary objective was to determine the smallest change in DXA-based measurement of BMD that should be surpassed (least significant change (LSC)) before suggesting that a biological change has occurred in the distal femur, proximal tibia and calcaneus...
December 20, 2016: Spinal Cord
https://www.readbyqxmd.com/read/27993754/the-interaction-of-de-novo-and-pre-existing-aortic-regurgitation-after-tavi-insights-from-a-new-quantitative-aortographic-technique
#11
Hiroki Tateishi, Mohammad Abdelghani, Rafael Cavalcante, Yosuke Miyazaki, Carlos M Campos, Carlos Collet, Tristan L Slots, Rogério S Leite, José A Mangione, Alexandre Abizaid, Osama I Soliman, Ernest Spitzer, Yoshinobu Onuma, Patrick W Serruys, Pedro A Lemos, Fabio S de Brito
AIMS: To evaluate the intermediate-term clinical impact of aortic regurgitation (AR) after transcatheter aortic valve implantation (TAVI) using a novel quantitative angiographic method taking into account the influence of pre-existing AR. METHODS AND RESULTS: AR after TAVI was quantified in 338 patients (age, 82[78-86] years; 55% males) and the influence on intermediate-term all-cause mortality was evaluated. In 228 aortograms, AR was quantitated using a dedicated video-densitometry method focused in the the left ventricular outflow tract (LVOT-AR)...
December 20, 2016: EuroIntervention
https://www.readbyqxmd.com/read/27986425/two-year-course-of-corneal-densitometry-after-descemet-membrane-endothelial-keratoplasty-dmek
#12
Friederike Schaub, Philip Enders, Cornelius Bluhm, Björn O Bachmann, Claus Cursiefen, Ludwig M Heindl
PURPOSE: To investigate the two-year course of corneal densitometry following Descemet membrane endothelial keratoplasty (DMEK) for Fuchs endothelial dystrophy (FED). DESIGN: Retrospective, interventional case series. METHODS: Densitometry values (corneal light backscatter in greyscale units) measured by Scheimpflug-based imaging and clinical records of 160 eyes of 160 patients undergoing DMEK for FED were reviewed. Outcome measures included densitometry data in 4 corneal layers (anterior layer (AL), central layer (CL), posterior layer (PL), and total layer (TL)) and 2 annuli (central annular zone 0-2mm and peripheral zone 2-10mm), central corneal thickness (CCT), best spectacle-corrected visual acuity (BSCVA), and endothelial cell density (ECD) prior to DMEK and at 1, 3, 6, 12, and 24 months postoperatively...
December 13, 2016: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/27955848/-intrathyroidal-location-of-parathyroid-glands-atypical-presentation-of-multiple-endocrine-neoplasia-type-1-syndrome
#13
Marta de la Fuente-Bartolomé, Alejando Moreno-Bargueiras, Irene Osorio-Silla, José Ignacio Martínez-Pueyo, Felipe de la Cruz-Vigo, Lara Gutiérrez-Ashling
BACKGROUND: The most common manifestation of MEN 1 syndrome is primary hyperparathyroidism (PHPT) with parathyroid multiglandular affectation. The intrathyroidal situation represents 3-4% of all glands, and it is the second most frequent location in the cervical ectopias. CLINICAL CASE: 11 year old patient, with a family history of MEN1 syndrome and carrier of this same mutation. Patient presents HPTP with osteopenia. The cervical ultrasound shows three compatible images with pathological parathyroid glands (bilateral lower and upper left)...
December 9, 2016: Cirugia y Cirujanos
https://www.readbyqxmd.com/read/27921146/bone-loss-at-the-distal-femur-and-proximal-tibia-in-persons-with-spinal-cord-injury-imaging-approaches-risk-of-fracture-and-potential-treatment-options
#14
REVIEW
C M Cirnigliaro, M J Myslinski, M F La Fountaine, S C Kirshblum, G F Forrest, W A Bauman
Persons with spinal cord injury (SCI) undergo immediate unloading of the skeleton and, as a result, have severe bone loss below the level of lesion associated with increased risk of long-bone fractures. The pattern of bone loss in individuals with SCI differs from other forms of secondary osteoporosis because the skeleton above the level of lesion remains unaffected, while marked bone loss occurs in the regions of neurological impairment. Striking demineralization of the trabecular epiphyses of the distal femur (supracondylar) and proximal tibia occurs, with the knee region being highly vulnerable to fracture because many accidents occur while sitting in a wheelchair, making the knee region the first point of contact to any applied force...
December 5, 2016: Osteoporosis International
https://www.readbyqxmd.com/read/27886084/intracranial-thrombus-morphology-and-composition-undergoes-time-dependent-changes-in-acute-ischemic-stroke-a-ct-densitometry-study
#15
Slaven Pikija, Jozef Magdic, Vladimir Trkulja, Peter Unterkreuter, Johannes Sebastian Mutzenbach, Helmut F Novak, Friedrich Weymayr, Larissa Hauer, Johann Sellner
The aim of our study was to assess whether cerebral artery clots undergo time-dependent morphological and compositional changes in acute ischemic stroke. We performed a retrospective chart review of patients admitted within 5 h from symptom onset to three European stroke centers and evaluated non-contrast-enhanced CT (NECT) for hyperdense artery signs (HAS) in 2565 scans. The occlusion site, density of HAS expressed in Hounsfield units (HU), area of HAS, and relative density (rHU) (HU clot/HU non-affected artery) were studied and related to time from symptom onset, clinical severity, stroke etiology, and laboratory parameters...
November 23, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27881164/administration-of-anti-receptor-activator-of-nuclear-factor-kappa-b-ligand-rankl-antibody-for-the-treatment-of-osteoporosis-was-associated-with-amelioration-of-hepatitis-in-a-female-patient-with-growth-hormone-deficiency-a-case-report
#16
Ayumu Takeno, Masahiro Yamamoto, Masakazu Notsu, Toshitsugu Sugimoto
BACKGROUND: Growth hormone deficiency (GHD) is associated with non-alcoholic fatty liver disease (NAFLD). A recent animal study showed that hepatocyte-specific receptor activator of nuclear factor-kappa B (RANK) knockout mice had significantly lower liver fat content compared with control mice concomitant with a decrease in production of inflammatory cytokines such as tumor necrosis factor-α (TNF-α) from hepatocytes and kupffer cells. The role of anti-RANK ligand (RANKL) antibody for osteoporosis on hepatitis in patients with aGHD is still unknown...
November 24, 2016: BMC Endocrine Disorders
https://www.readbyqxmd.com/read/27870622/dual-energy-ct-for-the-musculoskeletal-system
#17
Paul I Mallinson, Tyler M Coupal, Patrick D McLaughlin, Savvas Nicolaou, Peter L Munk, Hugue A Ouellette
The principal advantages of dual-energy computed tomography (CT) over conventional CT in the musculoskeletal setting relate to the additional information provided regarding tissue composition, artifact reduction, and image optimization. This article discusses the manifestations of these in clinical practice-urate and bone marrow edema detection, metal artifact reduction, and tendon analysis, with potential in arthrography, bone densitometry, and metastases surveillance. The basic principles of dual-energy CT physics and scanner design will also be discussed...
December 2016: Radiology
https://www.readbyqxmd.com/read/27843230/preclinical-cataract-masquerading-as-post-lasik-regression
#18
Rohit Shetty, Nikhil Negalur, Mathew Kurian, Rushad Shroff
The purpose of this case report is to bring forth a rare clinical scenario where preclinical cataract mimics post-LASIK regression and to describe the role of aberrometry in detecting higher order aberrations (HOAs) and early lens changes. A 36-year-old female presented with blurring of vision since 1 year after having undergone an uneventful LASIK surgery 3 years prior. Corneal topography and aberrometry were within normal limits. Although the lens was morphologically normal on slit lamp examination, increased HOAs and lenticular density were detected...
September 2016: Oman Journal of Ophthalmology
https://www.readbyqxmd.com/read/27836529/twelve-years-of-experience-with-miglustat-in-the-treatment-of-type-1-gaucher-disease-the-spanish-zagal-project
#19
Pilar Giraldo, Marcio Andrade-Campos, Pilar Alfonso, Pilar Irun, Koldo Atutxa, Antonio Acedo, Abelardo Barez, Margarita Blanes, Vicente Diaz-Morant, Ma Angeles Fernández-Galán, Rafael Franco, Cristina Gil-Cortes, Vicente Giner, Angela Ibañez, Paz Latre, Ines Loyola, Elisa Luño, Roberto Hernández-Martin, Blanca Medrano-Engay, José Puerta, Inmaculada Roig, Javier de la Serna, Olga Salamero, Lucia Villalón, Miguel Pocovi
We report data from a prospective, observational study (ZAGAL) evaluating miglustat 100mg three times daily orally. in treatment-naïve patients and patients with type 1 Gaucher Disease (GD1) switched from previous enzyme replacement therapy (ERT). Clinical evolution, changes in organ size, blood counts, disease biomarkers, bone marrow infiltration (S-MRI), bone mineral density by broadband ultrasound densitometry (BMD), safety and tolerability annual reports were analysed. Between May 2004 and April 2016, 63 patients received miglustat therapy; 20 (32%) untreated and 43 (68%) switched...
October 24, 2016: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/27824385/corneal-scheimpflug-densitometry-following-photorefractive-keratectomy-in-myopic-eyes
#20
Marie Boulze-Pankert, Romuald Dariel, Louis Hoffart
PURPOSE: To evaluate the modification of corneal optical densitometry following photorefractive keratectomy (PRK) using Scheimpflug topography. METHODS: Corneal densitometry (0 to 100 grayscale units [GSU]), pachymetry, and keratometry were evaluated using a rotating Scheimpflug camera (Pentacam HR; Oculus Optikgeräte, GmbH, Wetzlar, Germany) at baseline and 1 and 3 months following PRK in myopic patients. Subjective refraction, uncorrected distance visual acuity, corrected distance visual acuity, and corneal haze (0 to 4 on common subjective scale) were evaluated preoperatively at baseline, 1 month, and 3 months...
November 1, 2016: Journal of Refractive Surgery
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