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https://www.readbyqxmd.com/read/28643518/mini-c-arm-fluoroscopy-does-its-configuration-matter-for-radiation-exposure-to-the-surgeon
#1
Talia Chapman, Dennis P Martin, Christopher Williamson, Brian Tinsley, Mark L Wang, Asif M Ilyas
BACKGROUND: The risk of occupational radiation exposure to the surgeon associated with the use of a mini C-arm has yet to reach a wide consensus. Using a distal radius fracture surgery model, we tested the hypothesis that radiation exposure to the surgeon's critical body parts is independent of mini C-arm configuration. METHODS: An anthropomorphic mannequin (representing the upper body of a 60" male surgeon) was seated at a hand table as if operating on a volar-plated wrist Sawbone model...
June 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28632552/comparative-study-of-c-arms-for-intraoperative-3-dimensional-imaging-and-navigation-in-minimally-invasive-spine-surgery-part-ii-radiation-exposure
#2
Jan-Helge Klingler, Ronen Sircar, Christian Scheiwe, Evangelos Kogias, Marie T Krüger, Christoph Scholz, Ulrich Hubbe
STUDY DESIGN: A radiation exposure study in vitro. OBJECTIVE: This study aimed to compare the radiation exposure of 2 different 3-dimensional (3D) C-arm devices on an anthropomorphic phantom. SUMMARY OF BACKGROUND DATA: Minimally invasive pedicle screw placement requires intraoperative imaging techniques for visualization of the unexposed spine. Mobile 3D C-arms compose a 3D image data set out of multiple successive fluoroscopic images. METHODS: We compared the 3D C-arm devices Siremobil Iso-C 3D (Siemens Sector Healthcare, Erlangen, Germany) and Vision FD Vario 3D (Ziehm Imaging, Nuremberg, Germany) regarding their radiation exposure...
July 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28606272/-progression-of-the-pathogenesis-of-thyroid-associated-ophthalmopathy
#3
L Wang, J M Ma
Thyroid associated ophthalmopathy (TAO) is a common complication of Graves' disease (GD). The clinical manifestations are mainly swelling and retracted eyelid, protopsis and limited eye movements, and optic neuropathy can be seen in severe cases. The mechanism of TAO is not yet clear. A large number of studies have found that the disorders of autoimmunity play an important role in TAO, while genetic factors, oxidative stress, and environmental factors such as smoking participate in it. Therefore, we consult a large number of studies and expound the pathogenesis from the aspects of genetic susceptibility, immune mechanism, oxidative stress, and the effects of smoking to provide referrences for clinical associated studies...
June 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28606263/-three-dimensional-vector-analysis-after-decompression-surgery-in-thyroid-associated-ophthalmopathy
#4
J Guo, J Qian, X F Li, F X Meng, R Q Ma
Objective: To analyze the change of globe position after different orbital decompression in thyroid-associated ophthalmopathy (TAO). Methods: It was a retrosective case series study. Twenty-nine TAO patients (33 eyes) underwent orbital decompression were collected between October 2014 and December 2016 at Eye & ENT Hospital of Fudan University. There were 17 males and 12 females, and the average age was 46 years (ranging from 21 to 66 years). Fifteen patients (17 eyes) underwent balanced decompression, 11 patients (11 eyes) underwent deep lateral decompression, and 4 patients (5 eyes) underwent medial decompression...
June 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28606262/-therapeutic-outcomes-and-influence-factors-of-maximal-orbital-decompression-in-the-treatment-of-severe-dysthyroid-optic-neuropathy
#5
Y Wang, Y Y Li, N Yang, R Ma, L H Xiao
Objective: To evaluate the effectiveness of maximal orbital decompression in treatment for severe dysthyroid optic neuropathy (DON) of thyroid associated ophthalmopathy (TAO) and predictive factors of this therapy. Methods: The group consisted of 21 patients (30 eyes) with DON. The diagnosis was based on the following criteria: Deterioration of best corrected visual acuity (VA≤0.1), enlargement of extraocular muscles and sign of apical crowding in CT imaging, loss of colour vision. EXCLUSION CRITERIA: VA of DON>0...
June 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28606260/-the-stepwise-establishment-of-standardized-treatment-for-the-thyroid-eye-disease
#6
J Qian
Thyroid associated ophthalmopathy is a complex autoimmune disease characterized by inflammation of the orbital tissue, hyaluronan deposition and tissue remodeling due to a skewed production of preadipocytic fibroblasts and increased adipogenesis in the late stage. Its progression is strongly related to the functional status of thyroid. So far, there is no consensus on staging, grading and treatment worldwide owning to the complexity of its clinical manifestations and therapies. However, it is of great importance to accurately judge its status and make individualized therapeutic regimen...
June 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28598870/molecularly-targeted-agents-in-oculoplastic-surgery
#7
Richard C Allen
PURPOSE OF REVIEW: Significant advances have been made in oncology and rheumatology with the introduction of molecularly targeted agents (MTAs). MTAs consist of monoclonal antibodies and small molecule inhibitors. The purpose of this manuscript is to review the recent applications of MTAs to orbital, lacrimal, and eyelid disease. RECENT FINDINGS: The use of monoclonal antibodies has been described in the treatment of orbital vascular lesions, lymphoma, and squamous cell carcinoma...
June 8, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/28584858/a-longitudinal-population-study-of-the-impact-of-cataract-extraction-on-sleep-quality
#8
Yanjun Chen, David M Nondahl, Carla R Schubert, Dayna S Dalton, Adam J Paulsen, Barbara E K Klein, Ronald Klein, Karen J Cruickshanks
PURPOSE: To investigate the longitudinal effects of cataract extraction on sleep quality in two discrete population cohorts. METHODS: 301 participants who had senile cataract in both eyes at the baseline examination were selected from two large longitudinal epidemiologic studies of age-related eye disease, hearing, olfaction, and cognition. The participants were divided into two groups: one had cataract surgery (CS) in both eyes, and the other had no cataract surgery (NCS) in either eye by the follow up examination...
2017: Cogent Medicine
https://www.readbyqxmd.com/read/28584324/absorbed-doses-for-patients-undergoing-panoramic-radiography-cephalometric-radiography-and-cbct
#9
Małgorzata Wrzesień, Jerzy Olszewski
OBJECTIVES: Contemporary dental radiology offers a wide spectrum of imaging methods but it also contributes to an increase in the participation of dental radiological diagnosis in the patient's exposure to ionizing radiation. The aim of this study is to determine the absorbed doses of the brain, spinal column, thyroid and eye lens for patients during panoramic radiography, cephalometric radiography and cone beam computed tomography (CBCT). MATERIAL AND METHODS: The thermoluminescent dosimetry and anthropomorphic phantom was used for measuring the doses...
May 12, 2017: International Journal of Occupational Medicine and Environmental Health
https://www.readbyqxmd.com/read/28583248/pediatric-phantom-dosimetry-of-kodak-9000-cone-beam-computed-tomography
#10
Juan F Yepes, Megan R Booe, Brian J Sanders, James E Jones, Ygal Ehrlich, John B Ludlow, Brandon Johnson
PURPOSE: The purpose of the study was to evaluate the radiation dose of the Kodak 9000 cone-beam computed tomography (CBCT) device for different anatomical areas using a pediatric phantom. METHODS: Absorbed doses resulting from maxillary and mandibular region three by five cm CBCT volumes of an anthropomorphic 10-year-old child phantom were acquired using optical stimulated dosimetry. Equivalent doses were calculated for radiosensitive tissues in the head and neck area, and effective dose for maxillary and mandibular examinations were calculated following the 2007 recommendations of the International Commission on Radiological Protection (ICRP)...
May 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/28576206/association-of-orbital-decompression-and-the-characteristics-of-subsequent-strabismus-surgery-in-thyroid-eye-disease
#11
Ofira Zloto, Guy Ben Simon, Ido Didi Fabian, Oded Sagiv, Ruth Huna-Baron, Itay Ben Zion, Tamara Wygnanski-Jaffe
OBJECTIVE: To examine the association of orbital decompression and the characteristics and outcome of subsequent strabismus surgery in patients with thyroid eye disease (TED). METHODS: Data on patients with TED who underwent orbital decompression at the Goldschleger Eye Institute, Sheba Medical Center, Israel, between January 1990 to December 2011 were extracted. The characteristics of decompression and strabismus surgeries were recorded. The outcomes and association of both surgical procedures were analyzed...
June 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28574497/stepping-into-the-virtual-unknown-feasibility-study-of-a-virtual-reality-based-test-of-ocular-misalignment
#12
N Nesaratnam, P Thomas, A Vivian
IntroductionDissociated tests of strabismus provide valuable information for diagnosis and monitoring of ocular misalignment in patients with normal retinal correspondence. However, they are vulnerable to operator error and rely on a fixed head position. Virtual reality headsets obviate the need for head fixation, while providing other clear theoretical advantages, including complete control over the illumination and targets presented for the patient's interaction.PurposeWe compared the performance of a virtual reality-based test of ocular misalignment to that of the traditional Lees screen, to establish the feasibility of using virtual reality technology in ophthalmic settings in the future...
June 2, 2017: Eye
https://www.readbyqxmd.com/read/28559720/magnitude-of-diabetes-and-hypertension-among-patients-with-dry-eye-syndrome-at-a-tertiary-hospital-of-riyadh-saudi-arabia-a-case-series
#13
Abdullah Omar Al Houssien, Rana Omar Al Houssien, Abdulaziz Al-Hawass
PURPOSE: To study the magnitude of chronic diseases among patients suffering from Dry Eye Syndrome (DES) and compare them with published findings in the literature. METHODS: Patients diagnosed in 2016 suffering from DES based on presenting symptoms and findings of ocular examination were included in this study. The demographic information included age and gender. Chronic diseases among them were identified through case records, assessment and ongoing medications...
April 2017: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28553598/visual-evoked-potentials-in-overt-hypothyroid-patients-before-and-after-achievement-of-euthyroidism
#14
Aprajita, Geetanjali Sharma, Sameer Aggarwal
BACKGROUND: Visual evoked potential (VEP) measures the time taken for visual stimulus to travel from the eye to the occipital cortex. Hypothyroidism affects the central nervous system (CNS) through its role in gene expression, myelin production, axonal transportation, and neurotransmitters. Delay in the conduction of impulses results in abnormal VEP. OBJECTIVE: Correlate the electrophysiological findings of VEP in newly diagnosed treatment-naive hypothyroid patients before and after 3 months of treatment and to find the correlation with serum thyroid-stimulating hormone (TSH) levels...
May 2017: Indian Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28552606/differentiation-and-transplantation-of-embryonic-stem-cell-derived-cone-photoreceptors-into-a-mouse-model-of-end-stage-retinal-degeneration
#15
Kamil Kruczek, Anai Gonzalez-Cordero, Debbie Goh, Arifa Naeem, Mindaugas Jonikas, Samuel J I Blackford, Magdalena Kloc, Yanai Duran, Anastasios Georgiadis, Robert D Sampson, Ryea N Maswood, Alexander J Smith, Sarah Decembrini, Yvan Arsenijevic, Jane C Sowden, Rachael A Pearson, Emma L West, Robin R Ali
The loss of cone photoreceptors that mediate daylight vision represents a leading cause of blindness, for which cell replacement by transplantation offers a promising treatment strategy. Here, we characterize cone differentiation in retinas derived from mouse embryonic stem cells (mESCs). Similar to in vivo development, a temporal pattern of progenitor marker expression is followed by the differentiation of early thyroid hormone receptor β2-positive precursors and, subsequently, photoreceptors exhibiting cone-specific phototransduction-related proteins...
June 6, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/28513113/retina-and-nerve-fiber-layer-thickness-in-eyes-with-thyroid-associated-ophthalmopathy
#16
Sharon Blum Meirovitch, Igal Leibovitch, Anat Kesler, David Varssano, Amir Rosenblatt, Meira Neuderfer
BACKGROUND: Thyroid-associated ophthalmopathy (TAO) is an inflammatory disease that affects the thyroid gland and the eye orbit. Of patients with TAO, 3%-5% have severe sight-threatening disease due to optic neuropathy Optical coherence tomography (OCT), the non-invasive imaging technology that yields high-resolution cross-sectional images of the retina, provides qualitative and quantitative data on the retina. OBJECTIVES: To apply this technique to quantitatively assess retinal nerve fiber layer (RNFL) and macular ring thicknesses in healthy subjects and in patients with TAO to determine their relationship to the severity of the orbital disease...
May 2017: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/28506416/advancement-of-thyroid-surgery-video-recording-a-comparison-between-two-full-hd-head-mounted-video-cameras
#17
Andrea Ortensi, Andrea Panunzi, Silvia Trombetta, Alberto Cattaneo, Salvatore Sorrenti, Valerio D'Orazi
BACKGROUND: The aim of this study was to test two different video cameras and recording systems used in thyroid surgery in our Department. This is meant to be an attempt to record the real point of view of the magnified vision of surgeon, so as to make the viewer aware of the difference with the naked eye vision. MATERIALS AND METHODS: In this retrospective study, we recorded and compared twenty thyroidectomies performed using loupes magnification and microsurgical technique: ten were recorded with GoPro(®) 4 Session action cam (commercially available) and ten with our new prototype of head mounted video camera...
May 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28492870/radiologic-parameters-of-orbital-bone-remodeling-in-thyroid-eye-disease
#18
Nicholas Y Q Tan, Yuan-Yuh Leong, Stephanie S Lang, Zin M Htoon, Stephanie M Young, Gangadhara Sundar
Purpose: To radiologically examine for the presence of bony remodeling of the orbit in thyroid eye disease (TED). Methods: Computed tomography (CT) scans of 248 orbits of 124 patients with TED and 185 orbits of 138 controls were retrospectively reviewed, and the following parameters measured: the angle of the inferomedial orbital strut (AIOS), the angle of the medial wall (AMW), and the diameters of the extraocular muscles. The association of TED with the AIOS or AMW was analyzed with linear regression models, and the correlations between the AMW or AIOS measurements with the extraocular muscle measurements were determined...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28491471/a-novel-three-dimensional-vector-analysis-of-axial-globe-position-in-thyroid-eye-disease
#19
Jie Guo, Jiang Qian, Yifei Yuan, Rui Zhang, Wenhu Huang
Purpose. To define a three-dimensional (3D) vector method to describe the axial globe position in thyroid eye disease (TED). Methods. CT data from 59 patients with TED were collected and 3D images were reconstructed. A reference coordinate system was established, and the coordinates of the corneal apex and the eyeball center were calculated to obtain the globe vector [Formula: see text]. The measurement reliability was evaluated. The parameters of [Formula: see text] were analyzed and compared with the results of two-dimensional (2D) CT measurement, Hertel exophthalmometry, and strabismus tests...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28487798/orbital-t-cell-lymphoma-with-discrete-enlargements-of-all-extraocular-muscles-bilaterally-in-patient-with-moon-face-countenance
#20
Hideaki Kawakami, Kiyofumi Mochizuki, Hideko Goto, Naoki Watanabe, Takuji Tanaka
Purpose. To report our findings in a case of orbital T-cell lymphoma in which all of the extraocular muscles (EOMs) were bilaterally and discretely enlarged and the patient had a moon face countenance. Case. A 59-year-old woman presented with visual disturbances in her left eye, hyperemia in both eyes, and a moon face countenance. Examinations showed limited upward gaze in the right eye, blepharoptosis, hypertropia, and limited downward and rightward gaze in the left eye. Slit-lamp examination showed only chemosis and hyperemia of both eyes...
2017: Case Reports in Ophthalmological Medicine
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