Dynamic Analysis of Ocular Fundus Changes after Different Doses of Bevacizumab in the Treatment of Retinopathy of Prematurity in Threshold Period
Abstract Purpose: To analyze the efficacy of three different doses of bevacizumab treatment on Threshold retinopathy of prematurity during different periods . Methods: 36 cases (72 eyes) of infants with threshold ROP were analyzed, whom were treated with intravitreal injection of 1.25mg, 0.75mg or 0.5mg bevacizumab respectively from October 1st, 2016 to September 30th, 2017. After treatment, fundus examination results during five time points were recorded and classified into four grades according to the efficacy. Results: There were significant differences in the changes of fundus among the 3 groups on the 4th day and the 2nd week after treatment (P<0.001). In the 1.25mg group, there was a significant difference in the changes of fundus on the 4th day after treatment VS. the 2nd week after treatment (P<0.001). In the 0.5mg and 0.75mg group respectively, the changes of fundus were significantly different between each consecutive time points of the 4th day, 2nd week, 4th week and 2nd month after treatment (P<0.001,P<0.001,P=0.01; P<0.001,P=0.01,P=0.032). The proportion of normal retinal vessels of the three groups is 41.67% - 66. 67% in the 3rd month after treatment.Conclusion: Among the three doses of bevacizumab treatment, the efficacy of 1.25mg group is the best on the 4th day and the 2nd week after treatment, and there was no difference after 4 weeks. The efficacy of 0.5mg and 0.75mg group changed significantly from the 4th day to the 2nd month after treatment. Long-term follow-up of fundus changes was still needed to avoid recurrence of ROP whatever the dose of bevacizumab was uesed.