Predictive factors of early reactivation after ıntravitreal ranibizumab in agressive retinopathy of prematurity.

OBJECTIVE

Anti-VEGF agents are used in the treatment of aggressive retinopathy of prematurity (A-ROP), which is a rapidly progressive form of retinopathy of prematurity (ROP). This study aimed to evaluate risk factors for the early reactivation after anti-VEGF therapy with intravitreal ranibizumab (IVR) injection.

METHODS

Consecutive cases of A-ROP were included in this retrospective study. Intravitreal ranibizumab (0.25mg, Lucentis, Novartis AG) was injected in all A-ROP cases as initial therapy. Probable risk factors were reviewed. A reactivation in 4 weeks or less was defined as "early", and greater than 4 weeks was defined as "late". Since reactivations were observed in Zone II in all cases, laser photocoagulation (LP) was performed as rescue therapy.

RESULTS

The study consisted of 16 patients with A-ROP, all of whom experienced reactivation. In 6 cases,reactivation was seen early (Group-E), and in 10 cases, reactivation was late (Group-L). The mean gestational age of Group-E and Group-L were 26.60 (±0.89) and 26.73 (±2.10) weeks respectively (P=0.9), and mean birth weights were 918 (±282) and 898 (±0188) grams respectively (P=0.8). Zone I ROP was seen at a higher rate in Group-E (83.3%) than Group-L (30%) (P=0.009). Total O treatment duration in Group-E was statistically significantly longer than Group-L (P=0.03). The mean value of platelet distribution width (PDW) in Group-E was statistically significantly higher (P=0.002).

CONCLUSIONS

In patients with A-ROP, extended duration of O therapy and high values of PDW might be factors predictive of early reactivation after intravitreal ranibizumab injection.