View clinical trials related to Diabetic Retinopathy.
Filter by:The purpose of this study is to demonstrate superiority of Nepafenac Ophthalmic Suspension, 0.3% dosed once daily relative to Nepafenac Vehicle based upon clinical outcomes among diabetic subjects following cataract surgery.
Some studies have recently shown that the concentration of erythropoietin in the vitreous humor of diabetic patients suffering from diabetic retinopathy is higher than non-diabetic patients. It was reported a higher concentration of erythropoietin in vitreous humor than blood, indicating a local production. In some cases it was also found a positive association between concentrations of Erythropoietin and Vascular Endothelial Growth Factor (VEGF). Both of these factors, erythropoietin and VEGF, show important angiogenic activity and may play a role in the development of diabetic retinopathy. This study enrolled type 2 diabetic patients with PDR who had to undergo vitrectomy during the period May 2011-January 2012 at the Unit of Ophthalmology, A.O. Civil Hospital and University of Brescia. Inclusion criteria were the following: type 2 diabetes, age greater than 18 years, and PDR; exclusion criteria were: age less than 18 years, type 1 diabetes, initial DR, PDR patients not requiring surgery, previous vitrectomy in the eye under examination or other ophthalmic surgery or laser therapy within the previous 3 months. Non-diabetic patients who underwent vitrectomy for macular hole or pucker represented the control group (CTRLs); their inclusion criteria were: age greater than 18 years and the presence of macular pucker or macular hole requiring vitrectomy. Exclusion criteria were: age less than 18 years, diagnosis of diabetes mellitus, and previous vitrectomy in the eye under examination or other ophthalmic surgery or laser therapy within the previous 3 months. All patients underwent a complete ophthalmologic examination (visual acuity, slit lamp, tonometry, fluorescein retinal angiography, and optical coherence tomography -OCT-). Informed consent was obtained from all patients after a detailed description of the aims and procedures of the study. The following data were recorded for each patient: 1. Population: age (years), sex (M/F); 2. Clinical: diabetes (Absent or Type 2); time since initial diagnosis of diabetes (years); type of therapy for DM: diet, oral hypoglycaemic agents, mixed (oral agents and insulin, insulin); hypertension (defined as systolic blood pressure > 140 and diastolic blood pressure > 90 mmHg or on antihypertensive drugs); current (Yes/No) antihypertensive therapy; use of angiotensin II receptor blockers (ARB) or angiotensin converting enzyme inhibitors (ACE-i); presence of hypercholesterolaemia, comorbidities, therapy with statins (Yes/No), anticoagulants (Yes/No), antiplatelet therapy (Yes/No); other therapies performed, smoking (non-smoker, active smoker); complications of diabetes mellitus present at the time of evaluation (heart disease, nephropathy, neuropathy); 3. Ocular: eye (OD/OS); visual acuity; presence and grade of diabetic retinopathy; presence of emovitreo; presence of diabetic macular oedema; presence of cataract or lens implant; intervention with phacoemulsification during vitrectomy; presence of retinal diseases, or any other concomitant eye diseases; performance of previous retinal laser therapy, intravitreal injection of Avastin before the vitrectomy; 4. Biochemical: Haemoglobin (g/dL); glucose (mg/dL); glycated haemoglobin (%); platelets (N/mmc); creatinine (mg/dL); albuminuria (mg/day), creatinine clearance (mL/min), calculated by the Modification of Diet in Renal Disease (MDRD) formula; total cholesterol (mg/dL); HDL and LDL; triglycerides (mg/dL). All patients underwent a 23- or 25-gauge pars plana vitrectomy. The primary outcome of the study was the measurement of EPO and VEGF concentrations in serum and vitreous and aqueous humor. Blood samples, taken before surgery, were centrifuged at 3000 rpm for 10 minutes to separate the serum fraction, which was stored at -80°C. Aqueous and vitreous humor were taken during the surgery and immediately frozen at -80°C. Both EPO and VEGF concentrations were measured in serum and vitreous humor; however, owing to the small amount of sample, only EPO concentrations were determined in aqueous humor. EPO was assayed by radioimmunoassay (Immulite EPO 200, Siemens), with the lowest detection limit of 1.0 mIU/mL. VEGF was assayed by ELISA (Human VEGF Immunoassay, R & D Systems Europe, Abingdon, UK) with a lower limit of detection of 10.0 pg/mL. VEGF concentrations below the lower limit of detection were set to 5 pg/mL to perform statistical analysis. VEGF values above 2000 pg/mL were set to 2500 pg/mL; statistical tests were also performed after deleting the data above 2000 pg/mL.
The present study is intended to evaluate the safety and tolerability of topical OC-10X Ophthalmic Suspension in healthy human subjects. OcuCure Therapeutics, Inc. (Roanoke, VA) has developed a lead compound, known as OC-10X, which is a selective tubulin inhibitor under development for the treatment of Proliferative Diabetic Retinopathy (PDR) and Age-related Macular Degeneration (AMD). When administered as a topical eye drop, OC-10X has demonstrated both anti-angiogenic (inhibition) and angiolytic (regression) properties in animal models of AMD. Unlike other therapies, OC-10X provides the efficacy of a vascular targeting agent without the traditional toxicity and works downstream independently of growth factors. As demonstrated by OcuCure's preclinical data, tubulin inhibition using OC-10X has promise as a new therapeutic approach. PDR is a major cause of blindness in adults and is also caused by the growth of abnormal blood vessels. These new blood vessels are fragile and may hemorrhage into the vitreous. PDR affects up to 80% of all diabetics who have had diabetes for 15 years or more. If administration of OC-10X is well tolerated as a topical eye drop and is well tolerated systemically, then OC-10X will have the potential to provide benefits to patients with ocular diseases associated with angiogenesis.
We hypothesized that to reduce the adverse effects of intravitreal bevacizumab on ocular tissue and whole body, intravitreal injection of a low concentration of bevacizumab and conducting vitrectomy shortly after the injection is useful. In the present prospective, double-masked, randomized, controlled study, we aimed to verify the usefulness of intravitreal injection of 0.16 mg/0.05 ml bevacizumab one day before conducting vitrectomy for PDR.
The purpose of this study is to demonstrate superiority of Nepafenac Ophthalmic Suspension, 0.3% dosed once daily relative to Nepafenac Vehicle based upon clinical outcomes among diabetic subjects following cataract surgery.
The purpose of this study is to use a randomized controlled design to determine the impact of a SMS messaging intervention on the following outcomes among persons diagnosed with diabetic retinopathy in rural China.
Clinically significant macular edema (CSME) is a thickening of the macula associated with the risk of visual loss, which increases its centre is involved. Functional evaluation of the macula relies on best corrected visual acuity; however, neural dysfunction in diabetic eyes appears before retinal thickening and visual loss. Retinal sensitivity decreases in eyes with CSME, but it is unknown whether it differs between eyes with and without centre thickening. Aim: To compare the reduction of foveal sensitivity in eyes with CSME, with and without centre thickening.
To assess the safety of intravitreal aflibercept injection in the treatment of proliferative diabetic retinopathy (PDR) by evaluating the incidence and severity of adverse events.
To evaluate the ocular and systemic safety of intravitreal aflibercept injection in patients undergoing Pars Plana Vitrectomy for Proliferative Diabetic Retinopathy.
The specific aim of the study is to test the following hypothesis: That switching between treatments from bevacizumab to Ozurdex or vice versa in eyes with diabetic macular oedema with no or incomplete response from one therapy is beneficial.