The Effect of Intracameral Injection of Dexamethasone After Phacoemulsification in Diabetic Patients on Corneal Endothelial Cell Density
试验速览
- 阶段
- 4 期
- 状态
- 撤回
- 主要终点
- Mean change in corneal endothelial cell density before and after phacoemulsification
研究概览
简要总结
The prevalence of diabetes mellitus (DM) is rapidly growing worldwide. One major concern with diabetes mellitus is how it may affect vision in different ways; including the increased risk of developing cataract. Several studies have found an association between diabetes mellitus and the development of cataract. In patients with DM, cataract progression is also faster and occurs at a younger age.5 While results for modern cataract surgery are satisfactory, cataract surgery in diabetic patients carries a higher risk of peri and post-operative complications than in non-diabetic patients. Several studies have shown that the corneal endothelial count of diabetic patients is decreased, with more damage occurring to corneal endothelial cells following phacoemulsification in diabetics than in non-diabetics. This is presumed to be due to increased vulnerability of corneal endothelial cells in diabetics and a delay in the repair process.
Administration of topical corticosteroids is the main method to control post-operative inflammation after phacoemulsification, however many studies have also proved the safety and efficacy of intracameral corticosteroids to control inflammation post-operatively. While intracameral triamcinolone is effective in controlling post-operative inflammation, elevation of intraocular pressure is a main concern.
Dexamethasone has been found to be effective in controlling post-operative inflammation with no effect on intraocular pressure. This may be due to its rapid turnover and short half-life. No studies however have been performed to evaluate the safety and benefit of intracameral injection of dexamethasone following phacoemulsification in diabetic patients. In the present study, investigators aim to evaluate this and determine its effect on the post-operative corneal endothelial cell density and corneal thickness.
详细描述
This is a prospective interventional randomized controlled cohort study to determine the safety and benefit of intracameral dexamethasone injection at the conclusion of phacoemulsification in diabetic patients with cataract.
All patients will undergo full ophthalmological examination including best corrected visual acuity (BCVA), intraocular pressure (IOP), anterior segment examination and fundus examination. History and control of diabetes mellitus will be recorded. Patients ≥ 40 years old with a visually significant cataract, who are known to be diabetic for more than 10 years and are free of exclusion criteria will be included in our study.
In addition to routine pre-operative cataract evaluation and investigations, patients will also undergo non-contact Specular Microscopy (Konan Medical, Inc., Hyogo, Japan) to record the pre-operative corneal endothelial cell density in the central cornea, as well as anterior-segment optical coherence tomography (AS-OCT, Optovue Inc., Fremont, CA, USA) to record pre-operative central corneal thickness (CCT).
Standard phacoemulsification will be performed using the Infiniti machine (Alcon, Fort Worth, Texas, USA) with the stop and chop technique, and 0.2 mg of dexamethasone in 0.05 ml will be injected intracamerally at the conclusion of surgery in half of the study eyes, assigned using a randomization method.
Post-operative examination will include BCVA, IOP measurement and level of anterior segment inflammation on days 1,7 and 30 of follow up. Specular microscopy and AS-OCT will be performed at day 30 of follow up. Ophthalmologist performing examinations and investigations will be masked to whether dexamethasone was injected or not to avoid bias.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Single (Outcomes Assessor)
入排标准
- 年龄范围
- 40 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Age ≥ 40 years old
- •Type 1 or Type 2 diabetes duration ≥ 10 years
- •Visually significant cataract
排除标准
- •Dense central corneal opacities as dense nebulae and stromal dystrophies.
- •Pre-operative endothelial cell count less than 1500 cell/mm2
- •Fuchs dystrophy
- •Associated ocular conditions that could affect endothelial cell count as glaucoma and uveitis
- •Previous intraocular surgeries
研究组 & 干预措施
Dexamethasone group
Dexamethasone injected at conclusion of Phacoemulsification
干预措施: Dexamethasone (Drug)
Non-dexamethasone group
No dexamethasone will be injected at the conclusion of Phacoemulsification
干预措施: Saline Solutions, Intraocular (Drug)
结局指标
主要结局
Mean change in corneal endothelial cell density before and after phacoemulsification
时间窗: 1 month
This will be assessed using specular microscopy
次要结局
- Central corneal thickness(1 month)
- Intraocular inflammation(1 month)
- Intraocular pressure(1 month)
研究者
Ayman Gehad Elnahry
Clinical Demonstrator
Cairo University