Diabetic Retinopathy
Conditions
Keywords
calcium dobesilate, mild to moderate non-proliferative diabetic retinopathy, cluster-randomized controlled trial
Brief summary
Calcium dobesilate has been recommended to treat diabetic retinopathy due to its potential in protecting against retinal vascular damage. However, there was limited evidence exploring its efficacy in combating diabetic retinopathy progression. This study, a single-blind, multicenter, cluster-randomized, controlled superiority trial, was designed to evaluate whether calcium dobesilate could prevent diabetic retinopathy progression into an advanced stage among Chinese patients with mild to moderate non-proliferative diabetic retinopathy.
Detailed description
A total of 1,200 patients with mild to moderate non-proliferative diabetic retinopathy will be enrolled and randomly assigned at a ratio of 1:1 into the control group (that is, conventional treatment group) and the intervention group (that is, conventional treatment plus calcium dobesilate \[500 mg, 3 times per day\] for 12 months). The severity of diabetic retinopathy will be assessed by the Early Treatment Diabetic Retinopathy Study scale.
Interventions
use calcium dobesilate at the dosage of 500 mg, orally, 3 times per day, for 12 months
OTHERconventional treatment
maintain lifestyle habits and the usual treatment
Sponsors
Zhongda Hospital
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Being diagnosed with mild to moderate diabetic retinopathy * Being older than 18 years * Being willing to attend this trial.
Exclusion criteria
* Being allergic hypersensitive to experimental drugs or comparator drugs * Having alanine aminotransferase or aspartate aminotransferase ≥2 times higher than the upper limit of normal value, or total bilirubin ≥1.5 times higher than the upper limit of normal value upon the exclusion of mild fatty liver disease * Having severe renal insufficiency (defined as an estimated glomerular filtration rate ≤30 mL/min/1.73 m\^2) * Having malignant tumor and some other life-threatening diseases * Being in pregnancy, expecting pregnancy, or breast feeding * Being with unstable conditions, such as: uncontrolled high blood pressure (e.g., blood pressure \>180/100 mmHg); hemoglobin A1c \>8.0% or uncontrolled high blood glucose or hypoglycemia; acute cardiovascular events like unstable angina, congestive heart failure, stroke, transient ischemic attack, or myocardial infarction within the previous 3 months; uncontrolled infection; and diabetic ketoacidosis or hyperosmolar state in the past 1 month * Being with glaucoma, cataracts, or other opacities that may interfere with retinal examination and fundus photography * Receiving laser treatment, cryo-coagulation, or vitrectomy * Taking drugs such as diabetic retinopathy or traditional Chinese medicine that may help to improve micro-vascular function in the past 2 weeks * Receiving vascular endothelial growth factor therapy in the past 4 months or will be judged to take vascular endothelial growth factor therapy because of disease progression * Having attended other clinical trials in the past 1 month, being attending some clinical trials, or some other conditions that were judged unfit for this trial by investigators
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| The rate of the progression of diabetic retinopathy | from baseline to the end of treatment (12 months later) | Diabetic retinopathy progression is defined as an increase of 2 or more steps on the Early Treatment Diabetic Retinopathy Study scale during follow-up. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Changes in eyesight | 3-month, 6-month, and 12-month from baseline | Changes in eyesight assessed by visual chart at 4 m by optometrists |
| Changes in the numbers, location, and types of the retinal lesions | 3-month, 6-month, and 12-month from baseline | Using retinal photography to detect the changes in the numbers, location, and types of the retinal lesions at different time-points |
| Changes in the retinal blood vessel diameter and arteriovenous ratio | 3-month, 6-month, and 12-month from baseline | Using photography (optic disc-centered photograph) to detect the retinal blood vessel diameter and arteriovenous ratio at different time-points |
| Changes in metabolic biomarkers such as HbA1c | 3-month, 6-month, and 12-month from baseline | The metabolic biomarkers were assessed by laboratory measurement at different time-points |
Countries
China
Contacts
Primary ContactZilin Sun, Ph.D.
Outcome results
None listed