Related Experiment Video
Updated: Feb 13, 2026
10:46
Corneal Donor Tissue Preparation for Descemet's Membrane Endothelial Keratoplasty
Published on: September 17, 2014
15.7K
A comparative study on different Descemet membrane endothelial keratoplasty graft preparation techniques
Mohit Parekh1, Davide Borroni2,3, Alessandro Ruzza1
1International Center for Ocular Physiopathology, The Veneto Eye Bank Foundation, Venice, Italy.
Acta Ophthalmologica
|March 10, 2018
Summary
Comparing Descemet membrane endothelial keratoplasty (DMEK) graft preparation methods, Sinskey hook (M2) and punch (M3) offer reliable efficiency and quality. Methods M4 and M5 showed higher cell death, while M3 incurred higher costs and preparation time.
Area of Science:
- Ophthalmology
- Corneal Surgery
- Endothelial Keratoplasty
Background:
- Descemet membrane endothelial keratoplasty (DMEK) is a surgical procedure for endothelial dysfunction.
- Graft preparation is a critical step influencing outcomes.
- Various techniques exist, each with potential advantages and disadvantages.
Purpose of the Study:
- To compare the efficacy and safety of different Descemet membrane endothelial keratoplasty (DMEK) graft preparation methods.
- To evaluate graft preparation time, cost, endothelial cell loss (ECL), cell death, and morphology.
Main Methods:
- Five DMEK graft preparation methods were evaluated: M1 (epithelial spatula), M2 (Sinskey hook), M3 (donor trephine punch), M4 (submerged hydro-separation), and M5 (pneumatic dissection).
- Endothelial cell loss (ECL), cell viability (using Hoechst/Ethidium/Calcien AM staining), morphology, preparation time, and cost were assessed.
- Zonula Occludens-1 (ZO-1) expression was analyzed to evaluate cell-cell junctions.
Main Results:
- No significant difference in endothelial cell loss (ECL) was found among the five methods (p=0.96).
- Methods M4 and M5 exhibited significantly higher cell death and moderate pleomorphism compared to M1, M2, and M3.
- Graft preparation time was shorter for M4 and M5, but M3 was the most expensive and time-consuming.
Conclusions:
- DMEK graft preparation using the Sinskey hook (M2) and donor punch (M3) methods are reliable, offering good efficiency and quality with acceptable ECL.
- While M3 provides reliable outcomes, its associated costs and preparation time may be limiting factors.
- Methods M4 and M5 demonstrated increased cell death, suggesting they may be less favorable for preserving endothelial cell viability.
Related Concept Videos
02:26Comparing Copy Number Variations and SNPs
18.8K
Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
18.8K
01:08Sample Preparation for Analysis: Advanced Techniques
1.5K
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
1.5K
02:24Comparative Excretory Systems
26.7K
Animals have evolved different strategies for excretion, the removal of waste from the body. Most waste must be dissolved in water to be excreted, so an animal’s excretory strategy directly affects its water balance.
26.7K
01:09Comparing Experimental Results: Student's t-Test
6.1K
The t-test is a statistical method used to compare the sample mean with a population mean or compare two means from two data sets. The test statistic is calculated from the standard deviation, mean, and number of measurements in the data set at a selected confidence interval and then compared to a table of critical values at this confidence level. If the test statistic is smaller than the critical value, the null hypothesis is accepted. In this case, we state that the difference between the...
6.1K
01:20Comparing the Survival Analysis of Two or More Groups
618
Survival analysis is a cornerstone of medical research, used to evaluate the time until an event of interest occurs, such as death, disease recurrence, or recovery. Unlike standard statistical methods, survival analysis is particularly adept at handling censored data—instances where the event has not occurred for some participants by the end of the study or remains unobserved. To address these unique challenges, specialized techniques like the Kaplan-Meier estimator, log-rank test, and...
618
02:16Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes
17.1K
The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
17.1K