scholarly journals Optical reconstructive surgery of the anterior segment of the eye in the far eastern federal district – achievements and unsolved problems

2021 ◽  
Vol 13 (3) ◽  
pp. 47-54
Author(s):  
Oleg V. Kolenko ◽  
Yurii N. Dyachenko ◽  
Evgenii L. Sorokin ◽  
Maxim V. Pshenichnov
Keyword(s):  
Reconstructive Surgery ◽  
Anterior Segment ◽  
Federal District ◽  
Lamellar Keratoplasty ◽  
Deep Anterior Lamellar Keratoplasty ◽  
Federal State ◽  
High Tech ◽  
Anterior Lamellar Keratoplasty ◽  
Far Eastern ◽  
Modern Technologies

The aim was to analyze organizational and technical difficulties in introducing modern technologies of optical reconstructive surgery, and to find the options of their elimination. Materials and methods. Organizational arrangements to develop and to introduce into clinical practice modern technologies of optical reconstructive surgery in treatment of corneal opacities of different origin in the Khabarovsk branch of the S. Fedorov Eye Microsurgery Federal State Institution of the Ministry of Health of the Russian Federation has been analyzed. Results and conclusions. An unified register of patients of the Far Eastern Federal district who need optical keratoplasty (bullous keratopathies, keratoconus stages 34, post-traumatic leukomas, hereditary corneal dystrophies) a waiting list has been created. The necessary equipment and instruments were acquired, 4 surgeons were trained who mastered the technologies of deep anterior lamellar keratoplasty and Descemet membrane transplantation along with penetrating keratoplasty. From 2014 to 2018, 160 optical keratoplasty were performed using donor material; by 2019, the need for this type of high-tech treatment has been reduced by 2 times. To date, more than 30% of optical keratoplasties are performed using lamellar technology. The organizational sequence of ordering biological material, performing surgeries; the postoperative care system is got up and running; the outpatient departmentsophthalmologists of the region are trained to use clear objective criteria for dynamic follow-up of these patients.

scholarly journals Malapposition of Graft-host Interface after Penetrating Keratoplasty (PK) and Deep Anterior lamellar Keratoplasty (DALK): an optical coherence tomography study

2019 ◽  
Author(s):  
Yujin Zhao ◽  
Hong Zhuang ◽  
Jiaxu Hong ◽  
Lijia Tian ◽  
Jianjiang Xu
Keyword(s):  
Optical Coherence Tomography ◽  
Penetrating Keratoplasty ◽  
Corneal Transplantation ◽  
Anterior Segment ◽  
Lamellar Keratoplasty ◽  
Deep Anterior Lamellar Keratoplasty ◽  
Optical Coherence ◽  
Visual Outcomes ◽  
Total Prevalence ◽  
Anterior Lamellar Keratoplasty

Abstract Backgroud: Previous studies of internal graft-host malappositions have not dealt with the precise ways in which each malapposition affected post-penetrating keratoplasty (post-PK) visual outcomes. In this study, we reviewed our post-PK and post-deep anterior lamellar keratoplasty (post-DALK) keratoconic patients and used anterior segment optical coherence tomography (AS-OCT) to evaluate the correlations between graft-host interface (GHI) characteristics and visual outcomes. Methods: Novel GHI metrics included: mean graft-host touch (GHT), total prevalence of malapposition proportion (Pm), frequency of apposition (F), size of malapposition (Sm), junctional graft thickness (Tg), and the absolute value of difference between Tg and Th (|Tg-Th|). We connected the external and internal junction points of GHI (GHT) and drew a straight line through the central point, perpendicular to both sides of the cornea. Tg and Th were the thicknesses at cross-points 1 mm away from the meeting point on the external side of the graft and host, respectively. Correlations between GHI metrics and postsurgical visual outcomes [ logarithm of minimum angle of resolution best-corrected visual acuity (logMAR BCVA), spherical equivalent diopter (SE), diopter of spherical power (DS), diopter of cylindrical power (DC) and keratometric astigmatism (Astig value)] were evaluated for 45 patients (one eye each). Results: 22 post-PK and 23 post-DALK keratoconic patients were enrolled. Compared with the regular-apposition results, GHT was decreased in step and gape patterns, and increased in hill and tag patterns. SE increased by 6.851, 5.428 and 5.164 times for every 1% increase in: F (step) [b=6.851; 95% Confidence interval (CI)=2.975-10.727; P=0.001]; F (graft step) [b=5.428; 95% CI=1.685-9.171; P=0.005]; and Pm [b=5.164; 95%CI=0.913-9.146; P=0.018], respectively. SE increased by 0.031 times for every 1-μm increment of |Tg-Th| [b=0.031; 95% CI=0.009-0.054; P=0.007]. LogMAR BCVA increased by 0.001 times for every 1-μm increment of both GHT [b=0.001; 95% CI=0-0.002; P=0.030]. and Tg [b=0.001; 95% CI=0.001-0.002; P=0.001]. Astig value increased by 0.017 times for 1-μm increment of Sm [b=0.017; 95% CI=0-0.033; P=0.047]. Conclusion: This investigation of GHI characteristics suggests explanations for varied ametropia in keratoconic eyes and has potential significance as a reference for promoting pre-surgical planning and technology for corneal transplantation.

scholarly journals Malapposition of Graft-host Interface after Penetrating Keratoplasty (PK) and Deep Anterior lamellar Keratoplasty (DALK): an optical coherence tomography study

2020 ◽  
Author(s):  
Yujin Zhao ◽  
Hong Zhuang ◽  
Jiaxu Hong ◽  
Lijia Tian ◽  
Jianjiang Xu
Keyword(s):  
Optical Coherence Tomography ◽  
Penetrating Keratoplasty ◽  
Linear Regression Analysis ◽  
Corneal Transplantation ◽  
Anterior Segment ◽  
Lamellar Keratoplasty ◽  
Deep Anterior Lamellar Keratoplasty ◽  
Optical Coherence ◽  
Visual Outcomes ◽  
Anterior Lamellar Keratoplasty

Abstract Backgroud: Previous studies of internal graft-host malappositions have not dealt with the precise ways in which each malapposition affected post-penetrating keratoplasty (post-PK) visual outcomes. In this study, we reviewed our post-PK and post-deep anterior lamellar keratoplasty (post-DALK) keratoconic patients and used anterior segment optical coherence tomography (AS-OCT) to evaluate the associations between graft-host interface (GHI) characteristics and visual outcomes. Methods: Novel GHI metrics included: mean graft-host touch (GHT), total prevalence of malapposition proportion (Pm), frequency of apposition (F), size of malapposition (Sm), junctional graft thickness (Tg), junctional host thickness (Th) and the absolute value of difference between Tg and Th (|Tg-Th|). We connected the external and internal junction points of GHI (GHT) and drew a straight line through the central point, perpendicular to both sides of the cornea. Tg and Th were the thicknesses at cross-points 1 mm away from the meeting point on the external side of the graft and host, respectively. Linear regression analysis was used to describe associations between GHI metrics and postsurgical visual outcomes [ logarithm of minimum angle of resolution best-corrected visual acuity (logMAR BCVA), spherical equivalent diopter (SE), diopter of spherical power (DS), diopter of cylindrical power (DC) and keratometric astigmatism (Astig value)]. Results: We enrolled 22 post-PK and 23 post-DALK keratoconic patients. Compared with the regular-apposition results, GHT was decreased in step and gape patterns, and increased in hill and tag patterns. SE increased averagely by 6.851, 5.428 and 5.164 diopter per 1% increase in: F (step) [β=6.851; 95% Confidence interval (CI)=2.975-10.727; P=0.001]; F (graft step) [β=5.428; 95% CI=1.685-9.171; P=0.005]; and Pm [β=5.164; 95%CI=0.913-9.146; P=0.018], respectively. SE increased averagely by 0.31 diopter per 10-μm increment in |Tg-Th| [β=0.031; 95% CI=0.009-0.054; P=0.007]. LogMAR BCVA increased (on average) by 0.01 per 10-μm increment in both GHT [β=0.001; 95% CI=0-0.002; P=0.030]. and Tg [β=0.001; 95% CI=0.001-0.002; P=0.001]. Astig value increased on average by 0.17 diopter per 10-μm increment in Sm [β=0.017; 95% CI=0-0.033; P=0.047]. Conclusion: This investigation of GHI characteristics suggests explanations for varied ametropia in keratoconic eyes and has potential significance as a reference for promoting pre-surgical planning and technology for corneal transplantation.

Results of medical work in 2020 of the Khabarovsk branch of the S. Fyodorov Eye Microsurgery Federal State Institution

2021 ◽  
pp. 18-24
Author(s):  
O.V. Kolenko ◽  
◽  
V.V. Egorov ◽  
M.V. Pshenichnov ◽  
O.A. Pryadko ◽  
...  
Keyword(s):  
Medical Care ◽  
Far East ◽  
Federal District ◽  
State Institution ◽  
Federal State ◽  
High Tech ◽  
The Novel ◽  
Medical Work ◽  
Novel Coronavirus ◽  
Far Eastern

Purpose. Analysis of organization and results of medical work in the Khabarovsk branch of the S. Fyodorov Eye Microsurgery Federal State Institution (Khabarovsk Branch) in the context of a pandemic of the novel coronavirus disease (COVID-19) in 2020. Material and methods. The analysis of regulatory documents adopted in the Russian Federation, Khabarovsk Krai, and orders of the Director of the Khabarovsk Branch to ensure epidemiological wellbeing in organization of treatment process was carried out. Results. The developed complex of anti-epidemic measures to ensure epidemiological wellbeing at provision of emergency and planned ophthalmological care to residents of the Far Eastern Federal District of Russia made it possible in 100% of cases to fulfill the state task for the provision of high-tech medical care. The total volume of medical care for ophthalmological diseases in the Khabarovsk Branch as a whole decreased by 18,9%. It should be noted that the same trend was observed in all branches of the S. Fyodorov Eye Microsurgery Federal State Institution. Conclusion. Despite the problems that COVID-19 brought to work of the Khabarovsk Branch, it still fulfilled its mission, as defined by S. Fyodorov - to bring light and goodness to people living in the Far East of Russia. Key words: ophthalmology, medical work, hightech medical care, COVID 19, SARS-CoV-2, pandemic, organization of medical care, ocular emergency.

scholarly journals Toxic anterior segment syndrome following deep anterior lamellar keratoplasty

2016 ◽  
Vol 79 (5) ◽  
Author(s):  
Neslihan Sevimli ◽  
Remzi Karadag ◽  
Ozgur Cakici ◽  
Huseyin Bayramlar ◽  
Seydi Okumus ◽  
...  
Keyword(s):  
Anterior Segment ◽  
Lamellar Keratoplasty ◽  
Deep Anterior Lamellar Keratoplasty ◽  
Anterior Lamellar Keratoplasty ◽  
Toxic Anterior Segment Syndrome

scholarly journals A Deep Learning Approach for Successful Big-bubble Formation Prediction in Deep Anterior Lamellar Keratoplasty

2021 ◽  
Author(s):  
Takahiko Hayashi ◽  
Hiroki Masumoto ◽  
Hitoshi Tabuchi ◽  
Naofumi Ishitobi ◽  
Mao Tanabe ◽  
...  
Keyword(s):  
Deep Learning ◽  
Corneal Thickness ◽  
Anterior Segment ◽  
Automated System ◽  
Lamellar Keratoplasty ◽  
Deep Anterior Lamellar Keratoplasty ◽  
Biometric Data ◽  
Validation Data ◽  
Anterior Lamellar Keratoplasty ◽  
Big Bubble

Abstract The efficacy of deep learning in predicting successful big-bubble (SBB) formation during deep anterior lamellar keratoplasty (DALK) was evaluated. Medical records of patients undergoing DALK at the University of Cologne, Germany between March 2013 and July 2019 were retrospectively analyzed. Patients were divided into two groups: (1) SBB or (2) failed big-bubble (FBB). Preoperative images of anterior segment optical coherence tomography and corneal biometric values (corneal thickness, corneal curvature, and densitometry) were evaluated. A deep neural network model, Visual Geometry Group-16, was selected to test the validation data, evaluate the model, create a heat map image, and calculate the area under the curve (AUC). This pilot study included 55 patients overall (12 women, 43 men). SBBs were more common in keratoconus eyes (KC eyes) than in corneal opacifications of other etiologies (non KC eyes) (p = 0.001). The AUC was 0.746 (95% confidence interval [CI]: 0.603–0.889). The determination success rate was 78.3% (18/23 eyes) (95% CI: 56.3-92.5%) for SBB and 69.6% (16/23 eyes) (95% CI: 47.1–86.8%) for FBB. This automated system demonstrates the potential of SBB prediction in DALK. Although KC eyes had a higher SBB rate, no other specific findings were found in the corneal biometric data.

scholarly journals Intraoperative Optical Coherence Tomography Imaging in Corneal Surgery: A Literature Review and Proposal of Novel Applications

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Hiroshi Eguchi ◽  
Fumika Hotta ◽  
Shunji Kusaka ◽  
Yoshikazu Shimomura
Keyword(s):  
Optical Coherence Tomography ◽  
Corneal Transplantation ◽  
Anterior Segment ◽  
Lamellar Keratoplasty ◽  
Deep Anterior Lamellar Keratoplasty ◽  
Optical Coherence ◽  
Endothelial Keratoplasty ◽  
Corneal Surgery ◽  
Anterior Lamellar Keratoplasty ◽  
Intraoperative Optical Coherence Tomography

Intraoperative optical coherence tomography (iOCT) is widely used in ophthalmic surgeries for cross-sectional imaging of ocular tissues. The greatest advantage of iOCT is its adjunct diagnostic efficacy, which facilitates to decision-making during surgery. Since the development of microscopic-integrated iOCT (MIOCT), it has been widely used mainly for vitreoretinal and anterior segment surgeries. In corneal transplantation, MIOCT allows surgeons to visualise structure underneath the turbid and distorted cornea, which are impossible to visualise with a usual microscope. Real-time visualisation of hard-to-see area reduces the operation time and leads to favorable surgical outcomes. The use of MIOCT is advantageous for a variety of corneal surgical procedures. Here, we have reviewed articles focusing on the utility of iOCT  and MIOCT in penetrating keratoplasty, deep anterior lamellar keratoplasty, Descemet stripping automated endothelial keratoplasty, and Descemet membrane endothelial keratoplasty. The applications of MIOCT to corneal surgery in terms of surgical education for trainees, emergency surgery, and novel surgery are also discussed, with our cases performed using RESCAN® 700.

scholarly journals Traumatic Wound Dehiscence after Keratoplasty: Characteristics, Risk Factors, and Visual Outcome

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Mohamed Bahgat Goweida ◽  
Hany Ahmed Helaly ◽  
Alaa Atef Ghaith
Keyword(s):  
Risk Factors ◽  
Corneal Transplantation ◽  
Anterior Segment ◽  
Wound Dehiscence ◽  
Visual Outcome ◽  
Lamellar Keratoplasty ◽  
Deep Anterior Lamellar Keratoplasty ◽  
Anterior Lamellar Keratoplasty ◽  
Traumatic Wound

Purpose.The study aimed at evaluating the patients’ characteristics, risk factors, complications, and visual outcome of traumatic wound dehiscence after keratoplasty.Patients and Methods. A retrospective case series that included 20 eyes of 20 patients who had undergone a previous keratoplasty procedure followed by traumatic wound dehiscence. Records of the selected patients were reviewed. The mean duration of follow-up after repair was 21 months. Included patients were recalled for the final follow-up visit.Results.The procedure of corneal transplantation was penetrating (PKP) in 16 eyes and deep anterior lamellar keratoplasty (DALK) in 4 eyes. The associated anterior segment injuries included iris prolapse in 17 eyes and lens extrusion in 12 eyes. The associated posterior segment injuries included vitreous hemorrhage in 11 eyes and retinal detachment in 4 eyes. The final BSCVA was 0.1 or better in 5 cases (25 %) and was better than hand motions (HM) to less than 0.1 in 7 cases (35 %).Conclusion.Traumatic wound dehiscence following keratoplasty results in poor visual outcome. Cases following DALK may have less wound extent and better final visual outcome. The dehiscence seems most likely to occur during the first year.

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