目的：研究非缺血型视网膜分支静脉阻塞(BRVO)合并黄斑水肿(ME)患者的光学相干断层扫描血管成像(OCTA)中围绕黄斑无血管区(FAZ)区域300μm宽度内的血流密度(FD-300)，探讨并评估该参数对眼内注药次数的预测作用。

方法：回顾性研究，选取2021-01/2022-03于南京医科大学眼科医院诊断为非缺血型BRVO合并ME并接受了玻璃体腔内康柏西普注射(IVC)的患者50例50眼，采用3+PRN治疗方案。将眼内注药治疗≤5次的患眼列为B组(25例25眼)； 眼内注药治疗>5次的患眼列为C组(25例25眼)，另外随机选取对侧眼作为对照组A组(25例25眼)。采用OCTA对所有患眼行黄斑区3mm×3mm范围模式扫描采集视网膜血流图像，获取黄斑中心凹下视网膜厚度(CMT)及FD-300值。比较各组基线时及第3针注射后1、3、6、12mo时的CMT、BCVA(LogMAR)、FD-300。

结果：B组和C组受试者治疗后1、3、6、12mo时的患眼BCVA(LogMAR)较基线均明显改善(均P<0.05)； CMT较基线均明显降低(均P<0.05)； FD-300较基线降低(均P<0.05)。Pearson相关分析显示，BCVA(LogMAR)变化量与基线FD-300、CMT呈显著正相关(B组：r=0.77、0.70，均P<0.01； C组：r=0.89、0.78，均P<0.01)。眼内注药次数与基线FD-300呈显著负相关(B组：r=-0.63，P<0.01； C组：r=-0.71，P<0.01)。Logistic回归分析显示，治疗前FD-300参数是影响眼内注药次数的因素。

结论：玻璃体腔注射康柏西普治疗非缺血型BRVO合并ME患者能有效减轻患眼黄斑水肿，提高患者视力，降低FD-300。基线BCVA越差以及基线FD-300越低的患眼可能需要更多的注射次数。使用OCTA观察黄斑区FD-300，可在治疗前更好地预测非缺血型BRVO合并ME患者的最终视力恢复。

METHODS: A retrospective case study. A total of 50 patients(50 eyes)who were diagnosed as non-ischemic BRVO combined with ME and received intravitreal conbercept(IVC)in the Affiliated Eye Hospital of Nanjing Medical University from January 2021 to March 2022 were selected, and they were treated with 3+PRN regimen. The 25 cases(25 eyes)treated with intraocular injection ≤5 times were classified as group B, and 25 cases(25 eyes)treated with intraocular injection >5 times were classified as group C, and 25 fellow eyes were randomly selected as control group A. OCTA was used to scan the macular area in 3mm×3mm to collect images of retinal blood flow, the central macular thickness(CMT)and FD-300. The CMT, best-corrected visual acuity(BCVA), and FD-300 were compared between the two groups at baseline, 1, 3, 6 and 12mo after the third injection.

RESULTS: The BCVA(LogMAR)of the affected eye in both groups B and C at 1, 3, 6 and 12mo after the third injection was significantly lower than baseline(all P<0.05); the CMT and FD-300 were significantly lower than baseline(all P<0.05). Pearson correlation analysis showed that the change of BCVA(LogMAR)was positively correlated with the baseline FD-300 and CMT(group B: r=0.77, 0.70, all P<0.01; group C: r=0.89, 0.78, all P<0.01). The number of intraocular injections was negatively correlated with the baseline FD-300(group B: r=-0.63, P<0.01; group C: r=-0.71, P<0.01). Logistic regression analysis showed that the FD-300 at baseline is a factor that affects the number of intraocular drug injection.

CONCLUSION: IVC can effectively alleviate macular edema of the affected eye,improve visual acuity and reduce FD-300. The eyes with worse BCVA and lower FD-300 at baseline may require more injections of anti-VEGF. Observation of FD-300 with OCTA can better predict eventual vision recovery of non-ischemic BRVO with ME before treatment.