ABSTRACT
PURPOSE: To compare the effect on contrast sensitivity (CS) measurements of panretinal photocoagulation (PRP) associated with intravitreal bevacizumab (IVB) injections versus PRP alone in high risk proliferative diabetic retinopathy (HR-PDR). DESIGN: Prospective, randomised, masked, controlled trial. PARTICIPANTS: 42 patients with HR-PDR with visual acuity ≥20/200. METHODS: Eyes were randomised to one of two groups: one underwent PRP and IVB injections (study group) and the other PRP alone (control group). PRP was performed three times during the study and IVB injection was administered twice. MAIN OUTCOME MEASURES: Mean change in CS threshold scores between and within groups, from baseline to 6 months. RESULTS: Seven patients presented with vitreous haemorrhage and were removed from the study. Mean results for CS threshold (at 1.5, 3, 6, 12 and 18 cycles per degree (cpd) frequencies) for patients with and without diabetic macular oedema showed no significant differences (p>0.05 for all comparisons) between the two groups. In 35 eyes in the control group, compared with baseline values, there was significant worsening (p<0.05) of CS at 1.5, 12 and 18 cpd after 1 month, at 12 cpd after 3 months, and at 6 and 12 cpd after 6 months. In the study group, there was significant improvement in CS at 3 cpd, 3 months after treatment. CONCLUSIONS: In eyes with HR-PDR, PRP treatment is associated with deterioration of CS while adjuvant use of bevacizumab prevents such deterioration. CS evaluation seems to support the adjuvant use of bevacizumab when using PRP for the treatment of HR-PDR. ClinicalTrials.gov Identifier NCT 01389505.
Subject(s)
Angiogenesis Inhibitors/therapeutic use , Antibodies, Monoclonal, Humanized/therapeutic use , Contrast Sensitivity/physiology , Diabetic Retinopathy/therapy , Laser Coagulation , Adult , Aged , Bevacizumab , Combined Modality Therapy , Diabetic Retinopathy/drug therapy , Diabetic Retinopathy/physiopathology , Diabetic Retinopathy/surgery , Double-Blind Method , Female , Fluorescein Angiography , Humans , Intravitreal Injections , Male , Middle Aged , Prospective Studies , Risk Factors , Tomography, Optical Coherence , Vascular Endothelial Growth Factor A/antagonists & inhibitors , Visual Acuity/physiologyABSTRACT
PURPOSE: To evaluate the effect of a single intravitreal bevacizumab injection on visual acuity, contrast sensitivity and optical coherence tomography-measured central macular thickness in eyes with macular edema from branch retinal vein occlusion. METHODS: Seventeen eyes of 17 patients with macular edema from unilateral branch retinal vein occlusion were treated with a single bevacizumab injection. Patients were submitted to a complete evaluation including best corrected visual acuity, contrast sensitivity and optical coherence tomography measurements before treatment and one and three months after injection. Visual acuity, contrast sensitivity and optical coherence tomography measurements were compared to baseline values. RESULTS: Mean visual acuity measurement improved from 0.77 logMAR at baseline to 0.613 logMAR one month after injection (P=0.0001) but worsened to 0.75 logMAR after three months. Contrast sensitivity test demonstrated significant improvement at spatial frequencies of 3, 6, 12 and 18 cycles/degree one month after injection and at the spatial frequency of 12 cycles/degree three months after treatment. Mean ± standard deviation baseline central macular thickness (552 ± 150 µm) reduced significantly one month (322 ± 127 µm, P=0.0001) and three months (439 ± 179 µm, P=0.01) after treatment. CONCLUSIONS: Bevacizumab injection improves visual acuity and contrast sensitivity and reduces central macular thickness one month after treatment. Visual acuity returns to baseline levels at the 3-month follow-up, but some beneficial effect of the treatment is still present at that time, as evidenced by optical coherence tomography-measured central macular thickness and contrast sensitivity measurements.
Subject(s)
Angiogenesis Inhibitors/therapeutic use , Antibodies, Monoclonal, Humanized/therapeutic use , Macular Edema/drug therapy , Retinal Vein Occlusion/complications , Visual Acuity/drug effects , Aged , Bevacizumab , Contrast Sensitivity/drug effects , Female , Humans , Injections, Intraocular , Macular Edema/etiology , Male , Retinal Vein Occlusion/diagnosis , Retrospective Studies , Tomography, Optical Coherence , Treatment OutcomeABSTRACT
PURPOSE: To evaluate the effect of a single intravitreal bevacizumab injection on visual acuity, contrast sensitivity and optical coherence tomography-measured central macular thickness in eyes with macular edema from branch retinal vein occlusion. METHODS: Seventeen eyes of 17 patients with macular edema from unilateral branch retinal vein occlusion were treated with a single bevacizumab injection. Patients were submitted to a complete evaluation including best corrected visual acuity, contrast sensitivity and optical coherence tomography measurements before treatment and one and three months after injection. Visual acuity, contrast sensitivity and optical coherence tomography measurements were compared to baseline values. RESULTS: Mean visual acuity measurement improved from 0.77 logMAR at baseline to 0.613 logMAR one month after injection (P=0.0001) but worsened to 0.75 logMAR after three months. Contrast sensitivity test demonstrated significant improvement at spatial frequencies of 3, 6, 12 and 18 cycles/degree one month after injection and at the spatial frequency of 12 cycles/degree three months after treatment. Mean ± standard deviation baseline central macular thickness (552 ± 150 µm) reduced significantly one month (322 ± 127 µm, P=0.0001) and three months (439 ± 179 µm, P=0.01) after treatment. CONCLUSIONS: Bevacizumab injection improves visual acuity and contrast sensitivity and reduces central macular thickness one month after treatment. Visual acuity returns to baseline levels at the 3-month follow-up, but some beneficial effect of the treatment is still present at that time, as evidenced by optical coherence tomography-measured central macular thickness and contrast sensitivity measurements.
OBJETIVO: Avaliar o efeito de uma única injeção intravítrea de bevacizumabe na função visual, sensibilidade ao contraste, em olhos com edema macular causado por oclusão de ramo venoso retiniano. MÉTODOS: Dezessete olhos de 17 pacientes com edema macular unilateral causado por oclusão de ramo venoso retiniano foram tratados com uma única injeção intravítrea de bevacizumabe. Pacientes previamente foram submetidos a exame ocular completo, sensibilidade ao contraste, variável de maior interesse, melhor acuidade visual corrigida e tomografia de coerência óptica e foram reavaliados no 1º e 3º mês de seguimento. RESULTADOS: O teste de sensibilidade ao contraste demonstrou melhora significante nas frequências espaciais 3, 6, 12 e 18 ciclos/grau (c/g) no primeiro mês de seguimento e na frequência espacial 12 c/g após o 3º mês de tratamento. A média da acuidade visual melhorou de 0,77 no pré-tratamento para 0,61 logMAR no 1º mês de seguimento (P=0,0001), com piora ao final do 3º mês, 0,75 logMAR. A média da espessura foveal central (552 ± 150 µm) reduziu significantemente no 1º (322 ± 127 µm, P=0,0001) e 3º (439 ± 179 µm, P=0,01) mês de seguimento. CONCLUSÃO: No edema macular causado por oclusão de ramo venoso retiniano, uma única injeção intravítrea de bevacizumabe melhora a sensibilidade ao contraste, acuidade visual e reduz a espessura foveal central após 1 mês de tratamento. Após 3 meses de seguimento, ainda é possível observar benefício com o tratamento, como foi evidenciado pela sensibilidade ao contraste e a medida da espessura foveal central à tomografia de coerência óptica.
