Active clinical trials for "Vitreous Hemorrhage"

Based on the progress of cataract surgery, intraocular lens development, vitreoretinal surgery and anesthesia technology in recent years, the purpose of this study is to develop a new type of more accurate and minimally invasive combined surgery for cataract and fundus diseases, and to evaluate the advantages and value of the surgery as well as related complications, so as to minimize the surgical trauma and obtain faster visual function recovery and better patient comfort. To provide new solutions for the growing demand of eye health care.

Diabetic retinopathy (DR) is one of the main complications in diabetes, the proliferative diabetic retinopathy (PDR) is the most important one of the reasons leading to decreased vision, PDR is the stage of clinical intervention. Pars plana vitrectomy (PPV) is an effective treatment for PDR, while vitreous haemorrhage (VH) is a common complication after PPV, with incidence ranging from 11.8% to 75%, and is the main cause of reoperation. Anti-Vascular endothelial growth factor (VEGF) therapy for vitreous hemorrhage can inhibit neovascularization and prevent recurrent vitreous haemorrhage after absorption. Previous studies have found that anti-VEGF is a safe and effective treatment for postoperative recurrent VH. In consideration of the psychological and economic factor of patients, this study intends to observe the effectiveness of single vitreous injection of Ranibizumab in the treatment of postoperative recurrent VH on the basis of previous clinical work. Compare the visual acuity, macular thickness, VH recurrence and patient satisfaction between the Ranibizumab group and the PPV group by randomized grouping.To observe the effective rate and clearance time of recurrent VH after Ranibizumab treatment and whether it can effectively reduce the rate of PPV. To provide clinical guidance for the precise treatment of PDR patients, the treatment of PDR patients has important clinical significance and social and economic significance.

Pars-plana vitrectomy (PPV) is the cornerstone of surgical treatment for eyes with complicated proliferative diabetic retinopathy. Anti-VEGF intravitreal injection before PPV has shown a good effect on surgical outcomes. However, many patients present with co-morbidities that contraindicate the usage of anti-VEGF in the pre-operative period. Thus, cryoapplication, an old therapeutic tool for proliferative diabetic retinopathy may be a good alternative. The investigators present herein a comparative study between peripheral retinal cryoapplication and anti-VEGF before vitrectomy for complicated proliferative diabetic retinopathy.

The aim of the protocol is to compare the ocular outcomes after spontaneous vitreous hemorrhage treated with an early vitrectomy versus ultrasound monitoring with late vitrectomy. The hypothesis is that an early vitrectomy could decrease the rate of retinal detachment occurring after a spontaneous vitreous hemorrhage.

In this randomized clinical trial, the authors compare two cohorts receiving different endolaser spot amounts with similar laser settings in PDR subjects naïve to PRP undergoing PPV for the indication of VH.

Tractional retinal detachment (TRD) that involves the macula and non-clearing vitreous hemorrhage are the main causes of permanent vision loss in patients with diabetic retinopathy and requires prompt surgical intervention. Macular peeling is a surgical technique used in many retinal diseases including diabetic retinal detachment. Our purpose is to determine whether retinal microcirculatory changes occur after anatomically successful diabetic vitrectomy, and whether changes in blood flow vary if ILM peeling was done and whether changes in macular perfusion affect the final visual outcome. The aim of this study is to non-invasively evaluate, with optical coherence tomography angiography (OCT-A), the anatomical changes of deep and superficial vascular density in the macula with and without macular peeling in diabetic vitrectomy.

Hypothesis: Patients undergoing pars plana vitrectomy for the indication of diabetic vitreous hemorrhage will have a lower incidence of postoperative vitreous hemorrhaging during the 6-month trial period when vitreous substitution with 20-30% sulfur hexafluoride gas is utilized compared to vitreous substitution with balanced salt solution.

This study is conducted to compare the anti-VEGF effect and visual function in vitreous hemorrhage patients with diabetic macular edema after pars plana vitrectomy with inner limiting membrane peeling or not

This study is being conducted to determine if intravitreal injections of ranibizumab decrease the proportion of eyes in which vitrectomy is performed compared with saline injections in eyes presenting with vitreous hemorrhage from proliferative diabetic retinopathy.

Recurrent vitreous hemorrhage after vitrectomy for complications of diabetic retinopathy is a common occurrence. The hemorrhage may appear within the first few weeks after surgery or months later. This complication may delay visual rehabilitation significantly and sometimes requires additional procedures or surgery, jeopardizing previous successful operation. The causes of bleeding are diverse. While evidence suggests fibrovascular proliferation from the sclerotomy sites or in the vitreous base may be an important source of recurrent vitreous hemorrhage, other origins of hemorrhage exist including lysed clot from residual vitreous skirt, injured retinal vessels from surgery, and incompletely removed fibrovascular tissues. The latter three conditions may be the major sources of early postoperative vitreous hemorrhage. We have shown that peripheral retinal cryotherapy along with cryo treatment at the sclerotomy sites may effectively reduce the incidence of fibrovascular proliferation at the inner surface of sclerotomy sites and prevent the late-onset recurrent vitreous hemorrhage. However, many patients still experience disturbing vitreous hemorrhage within the first two to three weeks after post-operative transient clear-up of the vitreous. We hypothesize that gas bubble within the vitreous cavity may mechanically temponade the fragile retinal vessels, and concentrate the coagulation factors in the vitreous cavity, allowing the integrity of vessel walls gradually recovers and thus preventing the occurrence of early postoperative recurrent vitreous hemorrhage. To test this hypothesis, a clinical study was undertaken to investigate the effect of long-acting gas infused into the vitreous cavity at the end of diabetic vitrectomy in the prevention of recurrent vitreous hemorrhage.