Saratov JOURNAL of Medical and Scientific Research

cornea

Corneal endothelial cells condition after thermokeratocoagulation in a long-term period.

Year: 2019, volume 15 Issue: №2 Pages: 566-568
Heading: Ophtalmology Article type: Original article
Authors: Chuprov A.D., Kuznetsov I.V., Pasikova N.V., Kuznetsova V.I.
Organization: Orenburg branch of S. Fedorov Eye Microsurgery Federal State Institution
Summary:

The purpose of the research was to assess the quantitative and qualitative state of the corneal endothelium after thermokeratocoagulation in a long-term period. Material and Methods. The main group consisted of 18 patients (36 eyes) after thermokeratocoagulation, which was performed from 19 to 28 years ago. The control group consisted of 22 patients (44 eyes) aged from 45 to 58 years (middle age 51.3±3.2 years) from refraction and axial hypermetropy various degree without the previous surgical interventions. The research was performed on a non-contact mirror scanning microscope EM-3000 (Tomey, Japan). Results. The endothelial cells density in the main group averaged 2245.4±316.2 cells / mm2, in the control group 2661.7±169.2 cells / mm2 (p<0.05). The coefcient of endothelial cell size variability counted 0.34, in the control group 0.26 (p<0.05). The percentage of hexagonal corneal endothelial cells in patients after thermokeratocoagulation averaged 53.7±14.9 % in patients of the control group 74.3±6.5 % (p<0.05). Conclusion. In the long-term period patients showed a statistically signifcant decrease in the corneal endothelial cells density, a decrease in the percentage of hexagonality and an increase in the coefcient of cell size variability.

AttachmentSize
2019_02-1_566-568.pdf262.84 KB

Computer analysis of corneal aberrations in relation to the tasks of laser surgery of the anterior segment of the eye

Year: 2019, volume 15 Issue: №2 Pages: 425-428
Heading: Ophtalmology Article type: Original article
Authors: Bakutkin V.V., Bakutkin I.V., Zelenov V.A., Nugaeva N.R.
Organization: International Consulting, Audit and Education Academy, Saratov State Medical University
Summary:

Purpose: development of a method for computer analysis of corneal aberrations as applied to the tasks of laser surgery of the anterior segment of the eye. Material and Methods. As a result of mathematical modeling, an algorithm has been developed that is implemented as a computer program for selecting individual parameters of laser radiation depending on the optical characteristics of the cornea. Results. For astigmatism, it has been proposed to consider the topographic zones of the optical center of the cornea, 3.5 mm in diameter, and peripheral meridional zones. Aberrations at the periphery of the cornea increase by 10 %. At 1 and 2 stages of keratoconus, the rate of aberrations rises 2–3 times. In the third stage of keratoconus, in some cases keratometry and keratotopography is technically impossible. With pterygium 2 and 3 degrees, laser surgery in the peripheral zone of the cornea is impossible. Conclusion. Improving the efciency of laser operations is provided primarily by optimizing the impact parameters on the tissues of the anterior segment of the eye. The data on the types of corneal aberrations for various diseases, which indicate the need to change the parameters of laser exposure. The developed diagnostic algorithms are implemented as a computer program and allow you to optimize the parameters of laser irradiation of eye tissue.

AttachmentSize
2019_02-1_425-428.pdf274.12 KB

On preparation of am-niotic membrane as a scafold for cultivated cells to create corneal bioengineering constructs

Year: 2019, volume 15 Issue: №2 Pages: 409-413
Heading: Ophtalmology Article type: Original article
Authors: Aleksandrova OI, Gavrilyuk IO, Mashel TV, Chernysh VF, Churashov SV, Kulikov AN, Blinova MI.
Organization: Institute of Cytology, Russian Academy of Sciences, Military Medical Academy n.a. S. M. Kirov, St. Petersburg Polytechnic University
Summary:

Aim: to determine the preparation of amniotic membrane (AM) necessary for its use as a scafold for cultured cells to create bioengineered constructions (BEC). Material and Methods. Native AM was placed in a special clamping device and subjected to additional mechanical, thermal and enzymatic treatment: removal of mucus residues from its surface and cryoconservation of AM scafolds was performed at –80°C, — 20°C with subsequent decellularization with a 0.25 % Tripsin-EDTA mixture. The lifetime assessment of the morphology of cells cultivated on AM scafolds was performed using a Nikon Eclipse TS100 inverted microscope equipped with camera. The viability and metabolic activity of AM cells was determined by means of an MTT test using a UNIFLAN AIFR-01 tablet spectrophotometer (Picon, Russia) at a wavelength of 570 nm and a reference wavelength of 620 nm. Results. It has been established that the presence of mucous residueson the surface of native AM, which are not removed during standard mechanical processing, negatively afect the survival of the cell test system. The efects of cryoconservation of AM scafolds revealed the positive efects of this process together with enzymatic decellularization for improving the viability of cells cultured on scafolds. Conclusion. Standard mechanical processing of native AM does not guarantee complete cleaning of its surface from mucus residues that interfere with adhesion and even distribution of cultured cells. It is necessary to reliably control the removal of AM surface mucus before immobilization and further manipulations. Cryopreservation and subsequent decellularization of AM scafolds contributes to the increased viability of the cell test system. AM scafolds, purifed from amniotic mucus, cryopreserved at –80 ° C in a mixture of DMEM-F12 and DMSO (1:1) and enzymatic decellularization after thawing, turned out to be the best of the studied substrates for cell cultivation.

AttachmentSize
2019_02-1_409-413.pdf1.63 MB

Effectiveness evaluation of application of niosomal gel "Regenerin" in the treatment of chemical burns of cornea

Year: 2017, volume 13 Issue: №2 Pages: 216-220
Heading: Microbiology Article type: Original article
Authors: Bazikov I.A., Botasheva V.S., Kalinkina N.I., Maltsev A.N., Kostyukova N.Yu., Domenyuk D. A.
Organization: Stavropol State Medical University
Summary:

The aim of the work was to study the effectiveness of using the ophthalmic gel "Regenerin" in the treatment of a simulated chemical burn of the cornea in an experiment. Material and Methods. The chemical composition of the drug "Regenerin" was studied by mass spectrometry The regenerative action of the niosomal gel, including low molecular weight peptides extracted from placental cells and encapsulated, was then studied in 40 organisms of 20 rabbits of the chinchilla breed with a 10% solution of caustic soda. The subjects of the study are divided equally into two groups: in the experimental group, the treatment was carried out by applying a gel to the burn surface, the therapy was not performed in the control group. Results. The result of treatment with the "Regenerin" Ophthalmic Gel is a significant reduction in the timing of reparative regeneration in the animals of the experimental group due to increased metabolism and corneal neovascularization processes. Conclusion. The combined effect of these mechanisms, manifested in the arrest of edema, resorption of inflammatory infiltrates, normalization of the integrity of the endothelium, epithelial layer and basal membrane leads to completely restoring the histological structure of the cornea on the seventh day.

AttachmentSize
2017_02_216-220.pdf663.73 KB

Effectiveness evaluation of application of niosomal gel "Regenerin" in the treatment of chemical burns of cornea

Year: 2017, volume 13 Issue: №2 Pages: 216-220
Heading: Microbiology Article type: Original article
Authors: Bazikov I.A., Botasheva V.S., Kalinkina N.I., Maltsev A.N., Kostyukova N.Yu., Domenyuk D. A.
Organization: Stavropol State Medical University
Summary:

The aim of the work was to study the effectiveness of using the ophthalmic gel "Regenerin" in the treatment of a simulated chemical burn of the cornea in an experiment. Material and Methods. The chemical composition of the drug "Regenerin" was studied by mass spectrometry The regenerative action of the niosomal gel, including low molecular weight peptides extracted from placental cells and encapsulated, was then studied in 40 organisms of 20 rabbits of the chinchilla breed with a 10% solution of caustic soda. The subjects of the study are divided equally into two groups: in the experimental group, the treatment was carried out by applying a gel to the burn surface, the therapy was not performed in the control group. Results. The result of treatment with the "Regenerin" Ophthalmic Gel is a significant reduction in the timing of reparative regeneration in the animals of the experimental group due to increased metabolism and corneal neovascularization processes. Conclusion. The combined effect of these mechanisms, manifested in the arrest of edema, resorption of inflammatory infiltrates, normalization of the integrity of the endothelium, epithelial layer and basal membrane leads to completely restoring the histological structure of the cornea on the seventh day.

AttachmentSize
2017_02_216-220.pdf663.73 KB