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https://www.readbyqxmd.com/read/29327060/optical-coherence-tomography-analysis-of-the-optic-nerve-head-and-surrounding-structures-in-long-duration-international-space-station-astronauts
#1
Nimesh Patel, Anastas Pass, Sara Mason, Charles R Gibson, Christian Otto
Importance: After long-duration spaceflight, morphological changes in the optic nerve head (ONH) and surrounding tissues have been reported. Objective: To develop methods to quantify ONH and surrounding tissue changes using preflight and postflight optical coherence tomographic scans of the ONH region. Design, Setting, and Participants: Two separate analyses were done on retrospective data, with the first comparing a preflight group with a control group, followed by preflight to postflight analysis...
January 11, 2018: JAMA Ophthalmology
https://www.readbyqxmd.com/read/29323102/propionibacterium-acnes-induces-intervertebral-disc-degeneration-by-promoting-nucleus-pulposus-cell-apoptosis-via-the-tlr2-jnk-mitochondrial-mediated-pathway
#2
Yazhou Lin, Yucheng Jiao, Ye Yuan, Zezhu Zhou, Yuehuan Zheng, Jiaqi Xiao, Changwei Li, Zhe Chen, Peng Cao
Evidence suggests that intervertebral disc degeneration (IVDD) can be induced by Propionibacterium acnes (P. acnes), although the underlying mechanisms are unclear. In this study, we analyzed the pathological changes in degenerated human intervertebral discs (IVDs) infected with P. acnes. Compared with P. acnes-negative samples, P. acnes-positive IVDs showed increased apoptosis of nucleus pulposus cells (NPCs) concomitant with severe IVDD. Then, a P. acnes-inoculated IVD animal model was established, and severe IVDD was induced by P...
January 10, 2018: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/29318337/full-endoscopic-posterior-foraminotomy-surgery-for-cervical-disc-herniations
#3
REVIEW
M Komp, S Oezdemir, P Hahn, S Ruetten
OBJECTIVE: Surgery for cervical disc herniation with full-endoscopic posterior access. INDICATIONS: Cervical disc herniation and neuroforaminal pathology with radicular symptoms. CONTRAINDICATIONS: Neck pain alone, cervical myelopathy or pathologies with central nervous system symptoms, instabilities requiring correction/instabilities. SURGICAL TECHNIQUE: Introduction of a surgical tube to the facet joint at the level to be operated on...
January 9, 2018: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/29315127/tidemark-avulsions-are-a-predominant-form-of-endplate-irregularity
#4
Britta Berg-Johansen, Deeptee Jain, Ellen C Liebenberg, Aaron J Fields, Thomas M Link, Conor W O'Neill, Jeffrey C Lotz
STUDY DESIGN: Descriptive histologic and MRI study of human cadaveric spines. OBJECTIVE: To identify and characterize common endplate pathologies to form a histologic foundation for an etiology-based classification system. SUMMARY OF BACKGROUND DATA: Irregularities at the spinal disc-vertebra interface are associated with back pain and intervertebral disc herniation injuries. However, there is currently a lack of consensus regarding terminology for classification...
January 8, 2018: Spine
https://www.readbyqxmd.com/read/29301464/intervertebral-disc-degeneration-in-warmblood-horses-morphology-grading-and-distribution-of-lesions
#5
Wilhelmina Bergmann, Niklas Bergknut, Stefanie Veraa, Andrea Gröne, Hans Vernooij, Inge D Wijnberg, Willem Back, Guy C M Grinwis
Equine intervertebral disc degeneration is thought to be rare and of limited clinical relevance, although research is lacking. To objectively assess pathological changes of the equine intervertebral disc and their clinical relevance, description of the normal morphology and a practical, biologically credible grading scheme are needed. The objectives of this study are to describe the gross and histological appearance of the equine intervertebral discs and to propose a grading scheme for macroscopic degeneration...
January 1, 2018: Veterinary Pathology
https://www.readbyqxmd.com/read/29299971/the-role-of-the-fas-fasl-signaling-pathway-in-environmental-toxicant-induced-testicular-cell-apoptosis-an-update
#6
Mei Wang, Ping Su
The Fas/FasL signaling pathway is one of the major pathways that regulate apoptosis. Increasing studies have shown that the activation of the Fas/FasL signaling pathway is closely associated with testicular cell apoptosis. However, the mechanism involved is still unclear. We discuss recent findings regarding the molecular mechanisms by which environmental toxicants induce testicular pathology via Fas/FasL signaling. These findings suggest that Fas/FasL signaling is employed to impact the sensitivity (a response to external factors) of germ cells, disrupt steroidogenic hormone and cytokine metabolism mediated by Sertoli cells, and elicit the activation of NFAT (nuclear factor of activated T-cells) in Leydig cell apoptosis...
January 4, 2018: Systems Biology in Reproductive Medicine
https://www.readbyqxmd.com/read/29298687/segmentation-error-in-spectral-domain-optical-coherence-tomography-measures-of-the-retinal-nerve-fibre-layer-thickness-in-idiopathic-intracranial-hypertension
#7
Anuriti Aojula, Susan P Mollan, John Horsburgh, Andreas Yiangou, Kiera A Markey, James L Mitchell, William J Scotton, Pearse A Keane, Alexandra J Sinclair
BACKGROUND: Optical Coherence Tomography (OCT) imaging is being increasingly used in clinical practice for the monitoring of papilloedema. The aim is to characterise the extent and location of the Retinal Nerve Fibre Layer (RNFL) Thickness automated segmentation error (SegE) by manual refinement, in a cohort of Idiopathic Intracranial Hypertension (IIH) patients with papilloedema and compare this to controls. METHODS: Baseline Spectral Domain OCT (SDOCT) scans from patients with IIH, and controls with no retinal or optic nerve pathology, were examined...
January 4, 2018: BMC Ophthalmology
https://www.readbyqxmd.com/read/29288395/morphometric-study-of-the-posterior-longitudinal-ligament-at-the-lumbar-spine
#8
Céline Salaud, Stéphane Ploteau, Olivier Hamel, Olivier Armstrong, Antoine Hamel
PURPOSE: There are only two descriptions of posterior longitudinal ligament (PLL) at the lumbar spine level but its morphologic characteristics are different to cervical and thoracic levels. METHOD: Spine explantation (from Th12 to L5) followed by resection of the neural arch and the dural sheath in 13 fresh cadavers was performed. The PLL was isolated from other epidural structures and its width was measured and compared to the vertebral body width at each vertebral levels...
December 29, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29288031/prevalence-and-characteristics-of-myopic-degeneration-in-an-adult-chinese-american-population-the-chinese-american-eye-study
#9
Farzana Choudhury, Stacy M Meuer, Ronald Klein, Dandan Wang, Mina Torres, Xuejuan Jiang, Roberta McKean-Cowdin, Rohit Varma
PURPOSE: To characterize and provide population-based prevalence estimates of myopic degeneration (MD) among Chinese Americans, the fastest growing minority population in the United States in the last decade. DESIGN: Population-based, cross-sectional study. METHODS: 1523 Chinese American adults with myopia, aged 50 years and older, residing in the City of Monterey Park, California, underwent an interview and comprehensive eye exam, including subjective and objective refraction, and stereoscopic fundus photography...
December 26, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29284846/comparison-of-the-intravenous-and-epidural-administration-of-tumor-necrosis-factor-alpha-antagonists-in-an-experimental-rat-pain-model
#10
Serbülent Gökhan Beyaz, Mustafa Erkan İnanmaz, Tolga Ergönenç, Onur Palabıyık, Yakup Tomak, Ayça Taş Tuna
Introduction: Inflammatory cytokines secreted from the nucleus pulposus are thought to lead to lumbar nerve root compression-like symptoms. Tumor necrosis factor-alpha (TNF-α), an inflammatory cytokine, likely plays an important role in lumbar disc hernia-related leg pain. In this experimental study, we compared the effectiveness of TNF-α antagonists administered through the intravenous or epidural route in lumbar spine pathologies. Materials and Methods: After ethics committee approval had been obtained, 24 Sprague Dawley male rats aged 70-90 days and weighing 250-300 g each were allocated to four groups...
October 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/29274599/bowel-obstruction-in-obturator-hernia-a-challenging-diagnosis
#11
L Conti, E Baldini, P Capelli, C Capelli
INTRODUCTION: The obturator hernia is a rare pelvic hernia that often comes in the shape of bowel obstruction caused by the presence of an intestinal segment, more often ileum, passing trough the obturator foramen of the pelvic wall (Fig. 1). This type of hernia accounts for 0.5-1.4% of all hernias. CASE PRESENTATION: We report the clinical case of a 84-year-old woman with no previous surgical interventions, who went to the emergency room complaining of vomit and nausea, bowels closed to gas and stool, which she had experienced for three previous days...
December 7, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/29258803/antioxidant-functionalized-polymer-capsules-to-prevent-oxidative-stress
#12
Aitor Larrañaga, Isma Liza Mohd Isa, Vaibhav Patil, Sagana Thamboo, Mihai Lomora, Marc A Fernández-Yague, Jose-Ramon Sarasua, Cornelia G Palivan, Abhay Pandit
Polymeric capsules exhibit significant potential for therapeutic applications as microreactors, where the bio-chemical reactions of interest are efficiently performed in a spatial and time defined manner due to the encapsulation of an active biomolecule (e.g., enzyme) and control over the transfer of reagents and products through the capsular membrane. In this work, catalase loaded polymer capsules functionalized with an external layer of tannic acid (TA) are fabricated via a layer-by-layer approach using calcium carbonate as a sacrificial template...
December 16, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29250209/spine-on-a-chip-human-annulus-fibrosus-degeneration-model-for-simulating-the-severity-of-intervertebral-disc%C3%A2-degeneration
#13
Min Ho Hwang, Dong Hyun Cho, Seung Min Baek, Jae Won Lee, Jeong Hun Park, Chang Min Yoo, Jae Hee Shin, Hyo Geun Nam, Hyeong Guk Son, Hyun Jung Lim, Han Sang Cho, Hong Joo Moon, Joo Han Kim, Jong Kwang Lee, Hyuk Choi
The aetiology of intervertebral disc (IVD) degeneration accompanied by low back pain (LBP) is largely unknown, and there are no effective fundamental therapies. Symptomatic IVD is known to be associated with nerve root compression. However, even in the absence of nerve compression, LBP occurs in patients with IVD degeneration. We hypothesize that this phenomenon is associated with a concentration of pro-inflammatory cytokines such as interleukin (IL)-1β and tumour necrosis factor-alpha (TNF-α), which can lead to altered histologic features and cellular phenotypes observed during IVD degeneration...
November 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/29247396/the-mechanism-in-junctional-failure-of-thoraco-lumbar-fusions-part-ii-analysis-of-a-series-of-pjk-after-thoraco-lumbar-fusion-to-determine-parameters-allowing-to-predict-the-risk-of-junctional-breakdown
#14
Antonio A Faundez, Jonathon Richards, Philippe Maxy, Rachel Price, Amélie Léglise, Jean-Charles Le Huec
PURPOSE: To identify risk factors, in 12 patients with junctional breakdown (JBD) after thoraco-sacral fusions and to test a software locating maximal bending moment on full spine EOS images. METHODS: Twelve patients underwent long fusions for lumbar degenerative pathologies. Preop EOS images were compared to first postop EOS showing JBD. Parameters analyzed were: spinopelvic parameters [pelvic incidence (PI), pelvic tilt (PT), sacral slope (SS), sagittal vertical axis (SVA), spinosacral angle (SSA), lordosis, and kyphosis], proximal junctional angle (PJA), odontoid-hip axis angle (ODHA), and CIA...
December 15, 2017: European Spine Journal
https://www.readbyqxmd.com/read/29246889/nerve-terminals-at-the-human-corneoscleral-limbus
#15
Mouhamed A Al-Aqaba, Fady S Anis, Imran Mohammed, Harminder S Dua
AIMS: To demonstrate and characterise distinct subepithelial compact nerve endings (CNE) at the human corneoscleral limbus. METHODS: Ten fresh human donor corneoscleral discs (mean age, 67 years) and 26 organ-cultured corneoscleral rims (mean age, 59 years) were studied. All samples were subjected to enzyme histochemical staining related to endogenous acetylcholinesterase present in nerve tissue and H&E staining. Whole-mount en face imaging with NanoZoomer digital pathology microscope and serial cross-section imaging with light microscope were undertaken...
December 15, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29242976/a-rare-case-of-concomitant-cervical-disc-herniation-and-intradural-meningioma-treated-with-one-stage-posterior-surgery
#16
Xiaojian Hu, Zhong Chen, Yue Wang
STUDY DESIGN: Case report. PURPOSE: To present a rare case of cervical disc herniation concomitant with intradural meningioma which was successfully treated using a single one-stage posterior surgery of tumor resection and transdural discectomy. Coexistence of symptomatic disc herniation and intra-spinal tumor in the same cervical segment is extremely rare. Usually, two-stage anterior and posterior surgeries are needed to treat two conditions, respectively. One-stage posterior surgery to treat two pathologies simultaneously has not been reported in the literature...
December 14, 2017: European Spine Journal
https://www.readbyqxmd.com/read/29238986/clinical-implications-of-magnetic-resonance-imaging-in-temporomandibular-disorders-patients-presenting-ear-fullness
#17
Sang Yeon Lee, Ji Woon Park, Seo Eun Park, Dong Woo Nam, Hyun Jung Lim, Young Ho Kim
OBJECTIVES/HYPOTHESIS: The aim of this study was to investigate whether findings detected by temporomandibular joint magnetic resonance imaging (TMJ-MRI) can provide pathognomonic evidence of temporomandibular disorders (TMD) in patients with nonspecific ear fullness (EF). The association of nonspecific EF with clinical characteristics of TMD based on TMJ-MRI findings was examined. STUDY DESIGN: Retrospective analysis. METHODS: Thirty-four subjects (42 ears) who had no detectable otologic problems as a cause of EF were enrolled in this study...
December 14, 2017: Laryngoscope
https://www.readbyqxmd.com/read/29238852/combined-in-depth-3d-en-face-imaging-of-the-optic-disc-optic-disc-pits-and-optic-disc-pit-maculopathy-using-swept-source-megahertz-oct-at-1050%C3%A2-nm
#18
Josef Maertz, Jan Philip Kolb, Thomas Klein, Kathrin J Mohler, Matthias Eibl, Wolfgang Wieser, Robert Huber, Siegfried Priglinger, Armin Wolf
PURPOSE: To demonstrate papillary imaging of eyes with optic disc pits (ODP) or optic disc pit associated maculopathy (ODP-M) with ultrahigh-speed swept-source optical coherence tomography (SS-OCT) at 1.68 million A-scans/s. To generate 3D-renderings of the papillary area with 3D volume-reconstructions of the ODP and highly resolved en face images from a single densely-sampled megahertz-OCT (MHz-OCT) dataset for investigation of ODP-characteristics. METHODS: A 1...
December 14, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29233210/optical-coherence-tomography-indices-of-structural-retinal-pathology-in-schizophrenia
#19
Steven M Silverstein, Danielle Paterno, Lindsay Cherneski, Stuart Green
BACKGROUND: Prior optical coherence tomography (OCT) studies of schizophrenia have identified thinning of retinal layers. However, findings have varied across reports, and most studies have had serious methodological limitations. To address unresolved issues, we determined whether: (1) retinal thinning in schizophrenia occurs independently of comorbid medical conditions that affect the retina; (2) thinning is independent of antipsychotic medication dose; (3) optic nerve parameters are abnormal in schizophrenia; and (4) OCT indices are related to visual and cognitive impairments common in schizophrenia...
December 13, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/29214314/quantitative-fundus-autofluorescence-in-pseudoxanthoma-elasticum
#20
Martin Gliem, Philipp L Müller, Johannes Birtel, Myra B McGuinness, Robert P Finger, Philipp Herrmann, Doris Hendig, Frank G Holz, Peter Charbel Issa
Purpose: To quantify lipofuscin-associated fundus autofluorescence in patients with pseudoxanthoma elasticum (PXE), a model disease for Bruch's membrane pathology. Methods: In this prospective, monocenter, cross-sectional case-control study, 49 patients with PXE (mean age: 46 years, range 18-62) underwent quantitative fundus autofluorescence (qAF) imaging with a modified scanning laser ophthalmoscope containing an internal fluorescent reference for normalization of images...
December 1, 2017: Investigative Ophthalmology & Visual Science
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