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This study investigates the effect of argon laser panretinal photocoagulation (PRP) on the corneal endothelial cell density (ECD) in patients with proliferative diabetic retinopathy (PDR) by comparing ECD measurements before and after PRP treatment.
Proliferative diabetic retinopathy (PDR) is characterized by abnormal neovascularization driven by ischemic retinal tissue hypoxia and elevated vascular endothelial growth factor (VEGF) levels. Argon laser retinal photocoagulation (ALRP) is a standard treatment that applies thermal damage to the retinal pigment epithelium, reducing retinal oxygen demand and VEGF production, thereby causing regression of neovascular vessels. However, the laser light must pass through the anterior eye structures, potentially causing thermal and inflammatory damage to tissues such as the corneal endothelium, which is crucial for maintaining corneal transparency. This prospective observational clinical study conducted at Assuit University Hospital evaluates the impact of ALRP on corneal endothelial cell density using specular microscopy before, 1 week, and 1 month after PRP treatment in newly diagnosed PDR patients. Secondary outcomes include changes in cell morphology such as hexagonality and coefficient of variation, indicative of endothelial cell health and stability.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| The study population consists of 45 newly diagnosed patients of any age or sex with proliferative di | The inclusion criteria cover patients irrespective of age or sex who are newly diagnosed with proliferative diabetic retinopathy and are indicated for argon laser panretinal photocoagulation. Exclusion criteria include any history of corneal disease, previous intraocular surgeries, glaucoma, or intraocular inflammation to reduce confounding factors affecting corneal endothelial measurements. This helps to ensure that changes detected in corneal endothelial cell density and morphology are primarily attributable to the laser intervention rather than underlying ocular comorbidities. The sample size calculation determined that 45 patients would provide sufficient power to detect statistically significant changes, analyzed using paired t-tests and ANOVA for repeated measures. |
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| Measure | Description | Time Frame |
|---|---|---|
| Change in Corneal Endothelial Cell Density (ECD) after PRP | The primary outcome is the quantitative change in the corneal endothelial cell density measured by specular microscopy, comparing pre-treatment baseline values with post-treatment values at 1 week and 1 month intervals. This measure reflects the potential impact of ALRP on the corneal endothelial integrity, crucial for corneal transparency and function. | baseline |
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Inclusion Criteria:
Exclusion Criteria:
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The study population consists of 45 newly diagnosed patients of any age or sex with proliferative diabetic retinopathy who require panretinal photocoagulation.
The inclusion criteria cover patients irrespective of age or sex who are newly diagnosed with proliferative diabetic retinopathy and are indicated for argon laser panretinal photocoagulation. Exclusion criteria include any history of corneal disease, previous intraocular surgeries, glaucoma, or intraocular inflammation to reduce confounding factors affecting corneal endothelial measurements. This helps to ensure that changes detected in corneal endothelial cell density and morphology are primarily attributable to the laser intervention rather than underlying ocular comorbidities
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 7526212 | Background | Aiello LP, Avery RL, Arrigg PG, Keyt BA, Jampel HD, Shah ST, Pasquale LR, Thieme H, Iwamoto MA, Park JE, et al. Vascular endothelial growth factor in ocular fluid of patients with diabetic retinopathy and other retinal disorders. N Engl J Med. 1994 Dec 1;331(22):1480-7. doi: 10.1056/NEJM199412013312203. |
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