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https://www.readbyqxmd.com/read/29016454/intraocular-dexamethasone-implant-position-in-situ-and-ocular-hypertension
#1
Aditya Sudhalkar, Laurent Kodjikian, Jay Chhablani, Deepak Bhojwani, Abhay Vasavada
PURPOSE: To determine the association between the dexamethasone implant position in the vitreous cavity and ocular hypertension (OHT). METHODS: Retrospective review of patients with at least one intravitreal dexamethasone implant injection between 2012 and 2016. Patients who had a minimum follow-up for 6 months and documented evidence of the implant position were included in the study. Steroid responders, glaucoma patients, vitrectomized eyes, and eyes with liquefied vitreous were excluded...
October 9, 2017: Retina
https://www.readbyqxmd.com/read/28964580/cuticular-drusen-clinical-phenotypes-and-natural-history-defined-using-multimodal-imaging
#2
Chandrakumar Balaratnasingam, Svetlana Cherepanoff, Rosa Dolz-Marco, Murray Killingsworth, Fred K Chen, Randev Mendis, Sarah Mrejen, Lay Khoon Too, Orly Gal-Or, Christine A Curcio, K Bailey Freund, Lawrence A Yannuzzi
PURPOSE: To define the range and life cycles of cuticular drusen phenotypes using multimodal imaging and to review the histologic characteristics of cuticular drusen. DESIGN: Retrospective, observational cohort study and experimental laboratory study. PARTICIPANTS: Two hundred forty eyes of 120 clinic patients with a cuticular drusen phenotype and 4 human donor eyes with cuticular drusen (n = 2), soft drusen (n = 1), and hard drusen (n = 1)...
September 27, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28871127/simultaneous-multi-band-valley-protected-topological-edge-states-of-shear-vertical-wave-in-two-dimensional-phononic-crystals-with-veins
#3
Shao-Yong Huo, Jiu-Jiu Chen, Hong-Bo Huang, Guo-Liang Huang
The introduction of the concept of valley pseudospin to phononic crystals has made a remarkable topologically protected interface transport of sound, which opens a novel research area referred to as valley Hall topological insulators. Here, we demonstrate the simultaneous multi-band edge states of shear vertical waves in two-dimensional phononic crystals with veins. The multi-band edge states are topologically valley-protected and are obtained by simultaneously gapping multiple Dirac points at K (or K') under the inversion symmetry breaking...
September 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28333853/multimodal-imaging-in-vortex-vein-varices
#4
Chiara Veronese, Giovanni Staurenghi, Marco Pellegrini, Chiara Maiolo, Laura Primavera, Mariachiara Morara, Grayson W Armstrong, Antonio P Ciardella
PURPOSE: The aim of this study is to describe the clinical presentation of vortex vein varices with multimodal imaging. METHODS: The authors carried out a retrospective case series of eight patients (7 female, 1 male) with an average age of 60.2 years (min 8, max 84, median 68.5) presenting with vortex vein varices. All patients were evaluated at the Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy and at Luigi Sacco Hospital, University of Milan, Milan, Italy...
March 22, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28282389/4d-flow-mri-assessment-of-right-atrial-flow-patterns-in-the-normal-heart-influence-of-caval-vein-arrangement-and-implications-for-the-patent-foramen-ovale
#5
COMPARATIVE STUDY
Jehill D Parikh, Jayant Kakarla, Bernard Keavney, John J O'Sullivan, Gary A Ford, Andrew M Blamire, Kieren G Hollingsworth, Louise Coats
AIM: To investigate atrial flow patterns in the normal adult heart, to explore whether caval vein arrangement and patency of the foramen ovale (PFO) may be associated with flow pattern. MATERIALS AND METHODS: Time-resolved, three-dimensional velocity encoded magnetic resonance imaging (4D flow) was employed to assess atrial flow patterns in thirteen healthy subjects (6 male, 40 years, range 25-50) and thirteen subjects (6 male, 40 years, range 21-50) with cryptogenic stroke and patent foramen ovale (CS-PFO)...
2017: PloS One
https://www.readbyqxmd.com/read/28100480/detection-of-posterior-vortex-veins-in-eyes-with-pathologic-myopia-by-ultra-widefield-indocyanine-green-angiography
#6
Muka Moriyama, Kejia Cao, Satoko Ogata, Kyoko Ohno-Matsui
AIMS: To analyse the characteristics of posterior vortex veins detected in highly myopic eyes by wide-field indocyanine green angiography (ICGA). METHODS: One hundred and fifty-eight consecutive patients (302 eyes) with high myopia (myopic refractive error >8.0 dioptres (D) or axial length ≥26.5 mm) were studied. Wide-field ICGA was performed with the Spectralis HRA module. RESULTS: Posterior vortex veins were found in 80 eyes (26%)...
September 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28057349/flow-patterns-in-the-jugular-veins-of-pulsatile-tinnitus-patients
#7
Evan Kao, Sarah Kefayati, Matthew R Amans, Farshid Faraji, Megan Ballweber, Van Halbach, David Saloner
Pulsatile Tinnitus (PT) is a pulse-synchronous sound heard in the absence of an external source. PT is often related to abnormal flow in vascular structures near the cochlea. One vascular territory implicated in PT is the internal jugular vein (IJV). Using computational fluid dynamics (CFD) based on patient-specific Magnetic Resonance Imaging (MRI), we investigated the flow within the IJV of seven subjects, four symptomatic and three asymptomatic of PT. We found that there were two extreme anatomic types classified by the shape and position of the jugular bulbs: elevated and rounded...
February 8, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/27743618/posterior-pole-vortex-veins-in-central-serous-chorioretinopathy
#8
N Kim, E Escobar Martin, P Gili Manzanaro
No abstract text is available yet for this article.
October 12, 2016: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/27711003/unusual-posterior-varix-of-a-vortex-vein-ampulla
#9
Quraish Ghadiali, Anna Tan, K Bailey Freund
PURPOSE: We describe a patient with an unusually posterior varix of a vortex vein ampulla. METHODS: Case report. RESULTS: An unusually posterior varix of a vortex vein ampulla mimicking a choroidal neoplasm was identified. The diagnosis was obscured by the presence of overlying drusen. Through a combination of indocyanine green angiography and enhanced depth imaging optical coherence tomography, the varix was identified as an engorged vascular process correlating to ophthalmoscopic and tomographic examination...
January 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/27579787/development-of-a-fiber-optic-optical-coherence-tomography-probe-for-intraocular-use
#10
Tetsu Asami, Hiroko Terasaki, Yasuki Ito, Tadasu Sugita, Hiroki Kaneko, Junpei Nishiyama, Hajime Namiki, Masahiko Kobayashi, Norihiko Nishizawa
PURPOSE: To evaluate the performance of a newly developed 23-G optical coherence tomography (OCT) probe in animal and human eyes. METHODS: The probe is a side-imaging OCT device with a scanning beam set 43° to the optical axis and a working distance of 1.5 to 2.0 mm. The performance of the OCT probe was tested during vitrectomy in porcine cadaver eyes and rabbit eyes in situ. Optical coherence tomography images of a normal retina, retinal break, optic disc, pars plicata of the ciliary body, and intraoperative surgical manipulations were recorded...
July 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27552501/aqueous-vortex-derivation-a-preliminary-study-on-rabbits
#11
Alejandro Arciniegas, Fernando Ramirez
PURPOSE OF THE STUDY: The purpose of the study was to determine the feasibility of establishing a derivation between the anterior chamber (AC) and a vortex vein to lower the intraocular pressure (IOP). MATERIALS AND METHODS: A derivation between the AC and a vortex vein was performed in 1 eye of 16 albino rabbits, whereas the other eye was kept as the control. Derivations were performed using a Teflon tube with an external diameter of 0.90 mm and an inner diameter of 0...
September 2016: Journal of Glaucoma
https://www.readbyqxmd.com/read/27388731/in-vivo-hemodynamic-changes-of-vortex-vein-varix-on-real-time-video-angiography
#12
Tony D Kang, Alexzandra M Douglass, Sandor R Ferenczy, Emil Anthony T Say, Carol L Shields
No abstract text is available yet for this article.
February 2017: Retina
https://www.readbyqxmd.com/read/27341295/value-of-structural-and-hemodynamic-parameters-for-the-early-detection-of-primary-open-angle-glaucoma
#13
Natalia I Kurysheva, Olga A Parshunina, Ekaterina O Shatalova, Tatiana N Kiseleva, Michael B Lagutin, Alexey V Fomin
PURPOSE: To compare the diagnostic value of ocular blood flow parameters and choroidal thickness (CT) with standard structural parameters for early glaucoma detection. METHODS: A total of 32 patients with pre-perimetric glaucoma were compared with 30 age-matched normal subjects. The thickness of the ganglion cell complex (GCC), retinal nerve fiber layer (RNFL), and the choroid and foveal loss volume (FLV) were measured by means of optical coherence tomography (OCT)...
June 24, 2016: Current Eye Research
https://www.readbyqxmd.com/read/27328413/sequential-venous-anastomosis-design-to-enhance-patency-of-arterio-venous-grafts-for-hemodialysis
#14
Foad Kabinejadian, Boyang Su, Dhanjoo N Ghista, Munirah Ismail, Sangho Kim, Hwa Liang Leo
Arterio-venous grafts (AVGs), the second best option as long-term vascular access for hemodialysis, face major issues of stenosis mainly due to development of intimal hyperplasia at the venous anastomosis which is linked to unfavorable hemodynamic conditions. We have investigated computationally the utility of a coupled sequential venous anastomotic design to replace conventional end-to-side (ETS) venous anastomosis, in order to improve the hemodynamic environment and consequently enhance the patency of AVGs...
January 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/27203420/microvasculature-of-the-california-sea-lion-zalophus-californianus-eye-and-its-functional-significance
#15
Hiroyoshi Ninomiya
OBJECTIVE: To examine the ocular circulation in California sea lions (Zalophus californianus). ANIMALS STUDIED: Eyes were obtained postmortem from three sea lions that died while in captivity. PROCEDURES: Specimens from sea lions were investigated using scanning electron microscopy (SEM) of vascular corrosion casts. The thermal characteristics of live animal eyes were measured using an infrared imaging system. RESULTS: The major orbital artery of the sea lion was the ophthalmic artery...
May 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/26992837/ultra-widefield-steering-based-spectral-domain-optical-coherence-tomography-imaging-of-the-retinal-periphery
#16
Netan Choudhry, John Golding, Matthew W Manry, Rajesh C Rao
PURPOSE: To describe the spectral-domain optical coherence tomography (SD OCT) features of peripheral retinal findings using an ultra-widefield (UWF) steering technique to image the retinal periphery. DESIGN: Observational study. PARTICIPANTS: A total of 68 patients (68 eyes) with 19 peripheral retinal features. MAIN OUTCOME MEASURES: Spectral-domain OCT-based structural features. METHODS: Nineteen peripheral retinal features, including vortex vein, congenital hypertrophy of the retinal pigment epithelium, pars plana, ora serrata pearl, typical cystoid degeneration (TCD), cystic retinal tuft, meridional fold, lattice and cobblestone degeneration, retinal hole, retinal tear, rhegmatogenous retinal detachment, typical degenerative senile retinoschisis, peripheral laser coagulation scars, ora tooth, cryopexy scars (retinal tear and treated retinoblastoma scar), bone spicules, white without pressure, and peripheral drusen, were identified by peripheral clinical examination...
June 2016: Ophthalmology
https://www.readbyqxmd.com/read/26976663/circumferential-flow-of-particles-in-the-suprachoroidal-space-is-impeded-by-the-posterior-ciliary-arteries
#17
Bryce Chiang, Yoo Chun Kim, Henry F Edelhauser, Mark R Prausnitz
Microneedle injection into the suprachoroidal space (SCS) enables targeted drug delivery for treatment of posterior segment diseases. This study sought to identify and characterize anatomical barriers to circumferential spread of particles in the SCS of rabbit and human cadaver eyes. These barriers could make targeting specific regions within the SCS challenging. A hollow microneedle (33-gauge, 750 μm long) was used to inject fluorescent particles into albino New Zealand White rabbit eyes ex vivo at six different positions around the limbus and a limited number of conditions in vivo...
April 2016: Experimental Eye Research
https://www.readbyqxmd.com/read/26850315/unconventional-aqueous-humor-outflow-a-review
#18
REVIEW
Mark Johnson, Jay W McLaren, Darryl R Overby
Aqueous humor flows out of the eye primarily through the conventional outflow pathway that includes the trabecular meshwork and Schlemm's canal. However, a fraction of aqueous humor passes through an alternative or 'unconventional' route that includes the ciliary muscle, supraciliary and suprachoroidal spaces. From there, unconventional outflow may drain through two pathways: a uveoscleral pathway where aqueous drains across the sclera to be resorbed by orbital vessels, and a uveovortex pathway where aqueous humor enters the choroid to drain through the vortex veins...
May 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/26841898/orbital-venous-pattern-in-relation-to-extraorbital-venous-drainage-and-superficial-lymphatic-vessels-in-rats
#19
Marcela Maloveska, Lenka Kresakova, Katarina Vdoviakova, Eva Petrovova, Mario Elias, Artemiou Panagiotis, Zuzana Andrejcakova, Peter Supuka, Halina Purzyc, Viktoria Kissova
The purpose of this study was to demonstrate the normal and variant anatomy of extraorbital and intraorbital venous drainage together with retroorbital communication, and determine the lymphatic drainage from the superficial orbital region with a potential outlet of lymphatic vessel into the venous bloodstream. The study of the venous system was carried out on 32 Wistar rats by using corrosion casts methods and radiography, while the lymphatic system was studied in 12 Wistar rats following ink injection. Superficially, orbital veins are connected with extraorbital veins running through angular vein of the eye and the superficial temporal vein, and via the pterygoid plexus with the maxillary vein, which provide readily accessible communication routes in the spread of infection...
January 2017: Anatomical Science International
https://www.readbyqxmd.com/read/26469532/new-insight-into-the-macular-deep-vascular-plexus-imaged-by-optical-coherence-tomography-angiography
#20
Sophie Bonnin, Valérie Mané, Aude Couturier, Morgane Julien, Michel Paques, Ramin Tadayoni, Alain Gaudric
PURPOSE: To describe the macular deep capillary plexus (DCP) in normal eyes using optical coherence tomography angiography. METHODS: Retrospective study including 41 consecutive normal eyes imaged using optical coherence tomography angiography (RTVue XR Avanti; Optovue Inc). Default autosegmentation of the superficial capillary plexus (SCP) and DCP, and manual adjustments of "deep settings" were used to analyze the organization of the normal macular microvascularization and to investigate in vivo the connection between these capillary networks...
November 2015: Retina
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