scholarly journals Descemet’s Stripping-Automated Endothelial Keratoplasty for Traumatic Aniridia and Aphakia

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Sabah S. Jastaneiah
Keyword(s):  
Anterior Chamber ◽  
Case Reports ◽  
Young Male ◽  
Corneal Edema ◽  
Posterior Segment ◽  
Successful Outcome ◽  
Endothelial Keratoplasty ◽  
The Stability ◽  
Lens Power ◽  
Two Stages

This Interventional case reports a challenging case of descemet’s stripping-automated endothelial keratoplasty (DSAEK) in a young male patient with traumatic aniridia, aphakia, and corneal edema. Surgery was planned in two stages; first was implantation of aniridia intraocular lens (AIOL), few months later, DSAEK procedure was performed. Successful outcome of both procedures was achieved as measured by the stability of the AIOL, clarity of the cornea, attachment of the lenticule, and improvement in vision. Aniridia implant supports a sufficient amount of air in the anterior chamber especially if the posterior segment is well formed, while providing the required lens power to improve vision. DSAEK procedure challenges that include iris defects and aphakia may be overcome by stepwise planning of the procedure.

scholarly journals Epithelial Downgrowth after Intraocular Surgery Treated with Intracameral 5-Fluorouracil

2015 ◽  
Vol 2015 ◽  
pp. 1-4 ◽  
Author(s):  
Nina Ni ◽  
Marc A. Goldberg ◽  
Ralph C. Eagle ◽  
Christopher J. Rapuano ◽  
Julia A. Haller
Keyword(s):  
Anterior Chamber ◽  
Penetrating Keratoplasty ◽  
Case Reports ◽  
Corneal Edema ◽  
Limited Area ◽  
Endothelial Keratoplasty ◽  
Intraocular Surgery

Purpose. To present the clinical and histopathologic correlation of two cases of epithelial downgrowth (EDG) after prior intraocular surgery.Methods. Observational case reports.Results. We present two cases of EDG occurring after intraocular surgery. In both cases, after two anterior chamber injections of 5-fluorouracil (5FU), the area of EDG initially regressed. In Case 1, a limited area of EDG eventually recurred, and penetrating keratoplasty with cryotherapy was curative. In Case 2, subsequent corneal edema required Descemet-stripping automated endothelial keratoplasty, and the patient remained clinically free of EDG without further treatment.Conclusion. Intracameral 5FU may have a role in the treatment of EDG after intraocular surgery, though its precise utilization and impact remain to be defined.

scholarly journals Outcome of Four Point Fixated Open Loop Polymethyl Methacrylate Anterior Chamber Intraocular Lens: A Ten-Year Retrospective Study

2021 ◽  
Author(s):  
Sonali Sahoo ◽  
Priyadarsini Parida ◽  
Amrita Mohanty ◽  
Sujata Das ◽  
Ashik Mohamed ◽  
...  
Keyword(s):  
Risk Factors ◽  
Anterior Chamber ◽  
Intraocular Lens ◽  
Corneal Edema ◽  
Open Loop ◽  
Posterior Chamber ◽  
Close Monitoring ◽  
Refractive Outcomes ◽  
Corrected Distance Visual Acuity ◽  
Lens Power

Abstract PurposeTo study long term visual and refractive outcomes and complications in eyes with anterior chamber intraocular lens (ACIOL) implantationMethodsData of patients who underwent primary and secondary ACIOL implantation at L V Prasad Eye Institute, Bhubaneswar between 2011-2020 was collected, including details of post-operative visits. For analysis, sample was divided into: group Ia (primary ACIOL in cases without risk factors, n=104); group Ib (primary ACIOL in cases with pre-existing risk factors, n=49); and group II (secondary ACIOL, n=40).ResultsA total of 293 eyes of 288 patients were included. Mean pre-operative and last visit corrected distance visual acuity were 1.65±0.79 and 0.49±0.65 logMAR units in group Ia (p<0.001), and 1.46±0.74 and 0.52±0.72 logMAR units in group Ib (p<0.001). The mean spherical equivalent (MSE) for last refraction was -0.37 ± 1.05 dioptres (D) and -0.57 ± 1.04 D in groups I and II, respectively. Of 76 eyes in which addition of 2.5 D (over the near emmetropic posterior chamber intraocular lens power) was taken for ACIOL, 40 (52.6%) had MSE within ±0.5 D. Most common complications were transient corneal edema and anterior chamber reaction. Eyes on anti-glaucoma medications at last visit were eight (7.7%), 15 (30.6%), and two (5.0%) in groups Ia, Ib, and II respectively.ConclusionsWe observed that ACIOLs have good visual and refractive outcomes. Raised IOP is a concern in eyes with pseudoexfoliation, but can be managed with close monitoring. Hence ACIOL can be a good option for managing aphakia after cataract surgery.

Dietary Vitamin and Stability of Oral Anticoagulation: Proposal of a Diet with Constant Vitamin K1 Content

1997 ◽  
Vol 77 (03) ◽  
pp. 504-509 ◽  
Author(s):  
Sarah L Booth ◽  
Jacqueline M Charnley ◽  
James A Sadowski ◽  
Edward Saltzman ◽  
Edwin G Bovill ◽  
...  
Keyword(s):  
Dietary Intake ◽  
Vitamin K ◽  
High Performance ◽  
Case Reports ◽  
Food Composition ◽  
Dietary Guidelines ◽  
Dietary Vitamin ◽  
Vitamin K1 ◽  
The Stability ◽  
The Impact

SummaryCase reports cited in Medline or Biological Abstracts (1966-1996) were reviewed to evaluate the impact of vitamin K1 dietary intake on the stability of anticoagulant control in patients using coumarin derivatives. Reported nutrient-drug interactions cannot always be explained by the vitamin K1 content of the food items. However, metabolic data indicate that a consistent dietary intake of vitamin K is important to attain a daily equilibrium in vitamin K status. We report a diet that provides a stable intake of vitamin K1, equivalent to the current U.S. Recommended Dietary Allowance, using food composition data derived from high-performance liquid chromatography. Inconsistencies in the published literature indicate that prospective clinical studies should be undertaken to clarify the putative dietary vitamin K1-coumarin interaction. The dietary guidelines reported here may be used in such studies.

Surgical treatment of extensive perianal hidradenitis

2020 ◽  
Vol 99 (9) ◽  
Keyword(s):  
Surgical Treatment ◽  
Hidradenitis Suppurativa ◽  
Soft Tissues ◽  
Case Reports ◽  
Radical Excision ◽  
Skin Flaps ◽  
Perianal Area ◽  
Apocrine Glands ◽  
Patient Preparation ◽  
Two Stages

Introduction: Perianal hidradenitis suppurativa is a chronic recurrent inflammatory, suppurative, and fistulising disease of apocrine glands, adjacent anal canal and soft tissues. Perianal area is the second most common affected area after axilla. There are three grades of the disease. Hidradenitis suppurativa represents a chronic, recurrent, deep-seated folliculitis resulting in abscesses, followed by the formation of sinus tracts and subsequent scarring. Perianal hidradenitis suppurativa is the last and the most serious grade of the disease and a specific access is needed for patient preparation and surgical treatment alone. The currently preferred method of treatment for patients with extensive perianal hidradentitis is excision and closure with combination of skin flaps, primary suture and skin graft in one or two stages. Case reports: There are three case reports of perianal hidradenitis suppurativa in this article. The local and overall initial treatment of patients followed by a radical excision and closure with a rotation skin flaps and skin grafts is described. The final results were satisfactory, with no recurrence or serious complication.

scholarly journals EFFECT OF NONCLASSICAL POLARIZATION OF Na+ AND K+ ON THE STABILITY OF SOIL COLLOIDAL PARTICLES IN SUSPENSION

2017 ◽  
Vol 24 (07) ◽  
pp. 1850019
Author(s):  
DING WU-QUAN ◽  
HE JIA-HONG ◽  
WANG LEI ◽  
LIU XIN-MIN ◽  
LI HANG
Keyword(s):  
Negative Pressure ◽  
Colloidal Particles ◽  
Ion Concentration ◽  
Electrostatic Repulsion ◽  
Adjacent Soil ◽  
Net Pressure ◽  
The Stability ◽  
Two Stages ◽  
Soil Colloids ◽  
Total Average

The study of soil colloids is essential because the stability of soil colloidal particles are important processes of interest to researchers in environmental fields. The strong nonclassical polarization of the adsorbed cations (Na[Formula: see text] and K[Formula: see text] decreased the electric field and the electrostatic repulsion between adjacent colloidal particles. The decrease of the absolute values of surface potential was greater for K[Formula: see text] than for Na[Formula: see text]. The lower the concentration of Na[Formula: see text] and K[Formula: see text] in soil colloids, the greater the electrostatic repulsion between adjacent colloidal particles. The net pressure and the electrostatic repulsion was greater for Na[Formula: see text] than for K[Formula: see text] at the same ion concentration. For K[Formula: see text] and Na[Formula: see text] concentrations higher than 50[Formula: see text]mmol L[Formula: see text] or 100 mmol L[Formula: see text], there was a net negative (or attractive) pressure between two adjacent soil particles. The increasing total average aggregation (TAA) rate of soil colloids with increasing Na[Formula: see text] and K[Formula: see text] concentrations exhibited two stages: the growth rates of TAA increased rapidly at first and then increased slowly and eventually almost negligibly. The critical coagulation concentrations of soil colloids in Na[Formula: see text] and K[Formula: see text] were 91.6[Formula: see text]mmol L[Formula: see text] and 47.8[Formula: see text]mmol L[Formula: see text], respectively, and these were similar to the concentrations at the net negative pressure.

Influence of Early Descemet Stripping Endothelial Keratoplasty on Visual Outcomes in Pseudophakic Corneal Edema

2016 ◽  
Vol 172 ◽  
pp. 58-63 ◽  
Author(s):  
Sarah B. Weissbart ◽  
Kristin M. Hammersmith ◽  
Brandon D. Ayres ◽  
Christopher J. Rapuano ◽  
Parveen K. Nagra ◽  
...  
Keyword(s):  
Corneal Edema ◽  
Endothelial Keratoplasty ◽  
Descemet Stripping Endothelial Keratoplasty ◽  
Visual Outcomes

Dynamic Instability in Quartering Seas—Part III: Nonlinear Effects on Periodic Motions

1997 ◽  
Vol 41 (03) ◽  
pp. 210-223 ◽  
Author(s):  
K. J. Spyrou
Keyword(s):  
Periodic Motion ◽  
Horizontal Plane ◽  
Dynamic Instability ◽  
Parametric Instability ◽  
Nonlinear Effects ◽  
Ship Motions ◽  
Nonlinear Phenomena ◽  
Specific Sequence ◽  
The Stability ◽  
Two Stages

The loss of stability of the horizontal-plane periodic motion of a steered ship in waves is investigated. In earlier reports we referred to the possibility of a broaching mechanism that will be intrinsic to the periodic mode, whereby there will exist no need for the ship to go through the surf-riding stage. However, about this point the discussion was essentially conjectural. In order to provide substance we present here a theoretical approach that is organized in two stages: Initially, we demonstrate the existence of a mechanism of parametric instability of yaw on the basis of a rudimentary, single-degree model of maneuvering motion in waves. Then, with a more elaborate model, we identify the underlying nonlinear phenomena that govern the large-amplitude horizontal ship motions, considering the ship as a multi-degree, nonlinear oscillator. Our analysis brings to light a very specific sequence of phenomena leading to cumulative broaching that involves a change in the stability of the ordinary periodic motion on the horizontal plane, a transition towards subharmonic response and, ultimately, a sudden jump to resonance. Possible means for controlling the onset of such undesirable behavior are also investigated.

Dislocation of the Donor Graft to the Posterior Segment in Descemet Stripping Automated Endothelial Keratoplasty

2012 ◽  
Vol 153 (4) ◽  
pp. 638-642.e2 ◽  
Author(s):  
Natalie A. Afshari ◽  
Mark S. Gorovoy ◽  
Sonia H. Yoo ◽  
Terry Kim ◽  
Alan N. Carlson ◽  
...  
Keyword(s):  
Posterior Segment ◽  
Endothelial Keratoplasty ◽  
Donor Graft

scholarly journals APPLICATION OF LEARNING REINFORCEMENT METHOD IN ROBOTIZED AND AUTOMATED FORESTRY SYSTEMS

2020 ◽  
Vol 10 (1) ◽  
pp. 256-265
Author(s):  
Andrey Tolstyh ◽  
D Stupnikov ◽  
Sergey Malyukov ◽  
Aleksandr Luk'yanov ◽  
Yuriy Lunev
Keyword(s):  
Physical Environment ◽  
Learning Algorithm ◽  
Back Propagation ◽  
Industrial Robots ◽  
Environment Model ◽  
Random Position ◽  
Learning Reinforcement ◽  
The Stability ◽  
Two Stages ◽  
The Cost

Abstract Currently, most large enterprises are actively using industrial robots and other automated solutions. This allows a significant increase in productivity and quality of work performed. This article gave a brief overview of modern industrial robots, their operating principle, basic components and systems. A reinforcement learning algorithm was developed and tested. The task of constructing a learning algorithm with reinforcement was divided into two stages: modeling the environment and description and optimization of the cost function. Since industrial robotic systems operate in the real world, the environment model should reflect basic physical laws. Therefore, the pyBullet library of the physical environment was chosen as the physical environment for testing. After modeling the manipulator in the selected physical medium, it was given the trivial task of touching a given object with the capture of the manipulator. An artificial neural network was used as an agent interacting with the environment. The inputs were the coordinates of the object and the existing angles of rotation of the articulated joints of the robot. Outputs - angle of rotation of joints at this step. This network was trained using the back propagation method, Adam modification. The system was trained for about 12 hours. Success is achieved in 95% of cases when testing the stability of the system (random position of the cylinder). In future, it is planned to test the obtained models on bench samples

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