Comparison of Interval Variation and Dosage in Preoperative Bevacizumab Administration in Proliferative Diabetic Retinopathy Patients Undergoing Vitrectomy

2015-10-28 14:38:22 | BioPortfolio


Proliferative diabetic retinopathy patients requiring pars plana vitrectomy receiving preoperative 0.625 mg intravitreal bevacizumab 3-10 days prior to vitrectomy will have similar surgery times and similar intra-operative and postoperative complications to subjects who receive preoperative 1.25 mg intravitreal bevacizumab at both 3-5 days, and 6-10 days prior to vitrectomy.


Severe vision loss in patients with proliferative diabetic retinopathy (PDR) frequently results from complications related to neovascularization and fibrovascular proliferation. Patients with PDR are typically considered candidates for pars plana vitrectomy (PPV) when non-clearing vitreous hemorrhaging, tractional retinal detachment (TRD) development or extensive fibrovascular proliferation occur. Visual prognosis is guarded in patients undergoing PPV with these advanced presentations of PDR because of the high rate of both intra-operative and postoperative complications. Intra-operative bleeding may result in poor visualization during PPV that increases total surgery time and ultimately leads to surgical failure, while recurrent/persistent postoperative vitreous hemorrhage may occur as high as 75% and hinder visual rehabilitation and monitoring of further disease progression.

Preoperative administration of bevacizumab (Avastin; Genentech, Inc, South San Francisco, California, USA), a full-length recombinant humanized monoclonal antibody targeting vascular endothelial growth factor (VEGF), has been reported in prospective clinical trials to decrease the overall surgery time, lower the rate of intra-operative complications, and reduce the occurrence of postoperative hemorrhaging in PDR patients with active neovascularization and/or extensive fibrovascular proliferation undergoing PPV. Furthermore, two meta-analysis studies examining published randomized controlled trials support the use of intravitreal bevacizumab (IVB) as a preoperative adjunct. Although IVB is widely used as a preoperative adjunct in patients with PDR undergoing PPV, little clinical data is available regarding the optimal timing of preoperative IVB administration or the most effective dose. In this randomized prospective study, we attempt to elucidate the most appropriate interval and dose for the administration of preoperative IVB in patients with PDR undergoing PPV for non-clearing vitreous hemorrhaging, TRD or extensive fibrovascular proliferation.

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver), Primary Purpose: Treatment


Proliferative Diabetic Retinopathy, Pars Plana Vitrectomy, Intravitreal Bevacizumab


Intravitreal bevacizumab


Hospital La Carlota
Nuevo Leon




Panhandle Eye Group, LLP

Results (where available)

View Results


Published on BioPortfolio: 2015-10-28T14:38:22-0400

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Medical and Biotech [MESH] Definitions

Removal of the whole or part of the vitreous body in treating endophthalmitis, diabetic retinopathy, retinal detachment, intraocular foreign bodies, and some types of glaucoma.

Form of granulomatous uveitis occurring in the region of the pars plana. This disorder is a common condition with no detectable focal pathology. It causes fibrovascular proliferation at the inferior ora serrata.

Inflammation of the pars plana, ciliary body, and adjacent structures.

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Disease of the RETINA as a complication of DIABETES MELLITUS. It is characterized by the progressive microvascular complications, such as ANEURYSM, interretinal EDEMA, and intraocular PATHOLOGIC NEOVASCULARIZATION.

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