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      Effect of Adding Losartan to Bevacizumab for Treating Diabetic Macular Edema

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          Abstract

          Introduction

          Diabetic retinopathy is the most common cause of visual loss and blindness in the age group of 20 to 64 years. This study aimed to evaluate the efficacy of oral Losartan adjuvant therapy in combination with intravitreal injection of Bevacizumab in the treatment of diabetic macular edema.

          Methods

          In this randomized clinical trial, 61 eyes of 47 patients with normal blood pressure and diabetic macular edema and nonproliferative diabetic retinopathy were studied. Patients were randomly divided into Losartan ( n = 33) and control ( n = 28) groups. All patients received 3–6 intravitreal injections of Bevacizumab over 6 months. General examination including blood pressure and glycosylated hemoglobin measurements were performed in all patients. Complete ophthalmologic examination and macular OCT were performed at the first, third, and sixth months of treatment in all patients.

          Results

          The mean age of the patients studied was 57.1 ± 7.4 years and 37.7% of the patients were male. There was no significant difference between the two groups in terms of initial visual acuity, central macular thickness, and frequency of injections. There was no significant difference in visual acuity and central macular thickness between the two groups at the first, third, and sixth months of treatment. Age, frequency of injection, and initial macular thickness less than 450 microns were effective in patients' final visual acuity.

          Conclusion

          Short-term adjuvant treatment with Losartan in patients with diabetic macular edema and nonproliferative diabetic retinopathy has no greater effect than the standard treatment.

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          Most cited references 15

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          Renin-angiotensin system: upgrade of recent knowledge and perspectives

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            Diabetic Retinopathy

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              Vitreous levels of interleukin-6 and vascular endothelial growth factor in macular edema with central retinal vein occlusion.

              To investigate whether interleukin (IL)-6 or vascular endothelial growth factor (VEGF) influences macular edema in patients with central retinal vein occlusion (CRVO). Retrospective case-control study. Twenty-seven patients who had macular edema with CRVO and 16 patients with nonischemic ocular diseases (control group). Retinal ischemia was evaluated by measuring the area of capillary nonperfusion using fluorescein angiography and the public domain Scion Image program, and macular edema was examined by optical coherence tomography. Vitreous fluid samples were obtained at pars plana vitrectomy. VEGF and IL-6 levels in vitreous fluid and plasma were determined with enzyme-linked immunosorbent assay kits. Vitreous fluid levels of IL-6 and VEGF. The vitreous fluid levels of VEGF (median: 435 pg/ml) and IL-6 (median: 51.2 pg/ml) were significantly higher in the patients with CRVO than in the control group (median: 62.4 pg/ml and 1.07 pg/ml, respectively; P = 0.0046 and P<0.0001, respectively). The vitreous fluid level of VEGF was significantly correlated with that of IL-6 (P = 0.0029). Vitreous fluid levels of both VEGF and IL-6 were significantly higher in patients with CRVO who had retinal ischemia than in those without ischemia (P<0.0001 and P = 0.0003, respectively). Vitreous fluid levels of VEGF and IL-6 were also significantly correlated with the severity of macular edema (P = 0.0014 and P = 0.0047, respectively). Both IL-6 and VEGF were elevated in the vitreous fluid of patients with ischemic CRVO and macular edema. VEGF may increase vascular permeability in patients with macular edema and CRVO, whereas IL-6 may also contribute by acting together with or via VEGF. The author(s) have no proprietary or commercial interest in any materials discussed in this article.
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                Author and article information

                Contributors
                Journal
                J Ophthalmol
                J Ophthalmol
                joph
                Journal of Ophthalmology
                Hindawi
                2090-004X
                2090-0058
                2020
                1 October 2020
                : 2020
                Affiliations
                1Department of Ophthalmology, Ophthalmology Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran
                2Hormozgan University of Medical Sciences, Bandar Abbas, Iran
                3Poostchi Ophthalmology Research Center, Department of Ophthalmology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
                4Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran
                Author notes

                Academic Editor: Usha P. Andley

                Article
                10.1155/2020/4528491
                7547354
                Copyright © 2020 Fariba Ghassemi et al.

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                Categories
                Research Article

                Ophthalmology & Optometry

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