Anti-vascular endothelial growth factor for macular oedema secondary to branch retinal vein occlusion.


BACKGROUND:Branch retinal vein occlusion (BRVO) is one of the most common occurring retinal vascular abnormalities. The pathogenesis of BRVO is thought to involve both retinal vein compression and damage to the vessel wall, possibly leading to thrombus formation at sites where retinal arterioles cross retinal veins. The most common cause of visual loss in patients with BRVO is macular oedema (MO). Grid or focal laser photocoagulation has been shown to reduce the risk of visual loss and improve visual acuity (VA) in up to two thirds of individuals with MO secondary to BRVO, however, limitations to this treatment exist and newer modalities have suggested equal or improved efficacy. Recently, antiangiogenic therapy with anti-vascular endothelial growth factor (anti-VEGF) has been used successfully to treat MO resulting from a variety of causes. As elevated intraocular levels of VEGF have been demonstrated in patients with retinal vein occlusions there is a strong basis for the hypothesis that anti-VEGF agents may be beneficial in the treatment of vascular leakage and MO. OBJECTIVES:To investigate the efficacy and safety of intravitreal anti-VEGF agents for preserving or improving vision in the treatment of MO secondary to BRVO. SEARCH METHODS:We searched CENTRAL (which contains the Cochrane Eyes and Vision Group Trials Register) (The Cochrane Library 2012, Issue 7), Ovid MEDLINE, Ovid MEDLINE In-Process and Other Non-Indexed Citations, Ovid MEDLINE Daily, Ovid OLDMEDLINE (January 1946 to August 2012), EMBASE (January 1980 to August 2012), Latin American and Caribbean Literature on Health Sciences (LILACS) (January 1982 to August 2012, the metaRegister of Controlled Trials (mRCT) (, ( and the WHO International Clinical Trials Registry Platform (ICTRP) ( We did not use any date or language restrictions in the electronic searches for trials. We last searched the electronic databases on 7 August 2012 and the clinical trials registers on 10 September 2012. SELECTION CRITERIA:We included randomised controlled trials (RCTs) and quasi-RCTS of at least six months duration where anti-VEGF treatment was compared with another treatment, no treatment, or placebo. We excluded trials where combination treatments (anti-VEGF plus other treatments) were used and trials that investigated the dose and duration of treatment without a comparison group (other treatment/no treatment/sham). DATA COLLECTION AND ANALYSIS:Two review authors independently extracted the data. The primary outcome was the proportion of participants with an improvement from baseline in best-corrected visual acuity (BCVA) of greater than or equal to 15 letters (3 lines) on the Early Treatment in Diabetic Retinopathy Study (ETDRS) Chart at six months and at 12 months of follow-up. The secondary outcomes we report are the proportion of participants who lost greater than or equal to 15 ETDRS letters (3 lines) and the mean VA change at six months and any additional follow-up intervals as well as the change in central retinal thickness on optical coherence tomography (OCT) from baseline and final reported follow-up, the number and type of complications, the number of additional interventions administered and any adverse outcomes. Where available, the cost benefit and quality of life data reported in the primary studies is presented. MAIN RESULTS:We found one RCT and one quasi-RCT that met the inclusion criteria after independent and duplicate review of the search results. The studies used different anti-VEGF agents and different study groups which were not directly comparable.One multi-centre RCT (BRAVO) conducted in the USA randomised 397 individuals and compared monthly intravitreal ranibizumab (0.3 mg and 0.5 mg) injections with sham injection. The study only included individuals with non-ischaemic BRVO. Although repeated injections of ranibizumab appeared to have a favourable effect on the primary outcome, approximately 50% of the ranibizumab 0.3 mg group and 45% of the ranibizumab 0.5 mg group received rescue laser treatment which may have an important effect on the primary outcome. In addition, during the six-month observation period 93.5% of individuals in the sham group received intravitreal ranibizumab (0.5 mg). This cross-over design limits the ability to compare the long-term impact of ranibizumab versus a pure control group.The second trial was a small study (n = 30) from Italy with limitations in study design that reported a benefit of as-required intravitreal bevacizumab (1.25 mg) over laser photocoagulation in MO secondary to BRVO. We present the evidence from these trials and other interventional case series. AUTHORS' CONCLUSIONS:The available RCT evidence suggests that repeated treatment of non-ischaemic MO secondary to BRVO with the anti-VEGF agent ranibizumab may improve clinical and visual outcomes at six and 12 months. However, the frequency of re-treatment has not yet been determined and the impact of prior or combined treatment with laser photocoagulation on the primary outcome is unclear. Results from ongoing studies should assess not only treatment efficacy but also, the number of injections needed for maintenance and long-term safety and the effect of any prior treatment.


Mitry D,Bunce C,Charteris D




Has Abstract


2013-01-31 00:00:00








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    journal_title:The Cochrane database of systematic reviews

    pub_type: 杂志文章,评审


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    journal_title:The Cochrane database of systematic reviews

    pub_type: 杂志文章,meta分析,评审


    authors: Yip P,Middleton P,Cyna AM,Carlyle AV

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