Study of no Inferiority Between Two Doses (0.500mg and 0.625mg) of Bevacizumab Intravitreal in the Treatment of Retinopathy of Prematurity Type 1

ustification: Before the treatment was with Cryotherapy and the standard gold is the laser, however the retina tissue is destroyed, and there is loss of visual field and as this procedure has need to be with general anesthesia, there may be trans and post surgical complications. Currently the intravitreal antiangiogenics are been employed (that inhibit the VEGF), specially the Bevacizumab, it's a quickly procedure with topic anesthesia and low price, with a good results.

It's known that intravitreal bevacizumab arrives blood and there aren't reports of secondary efects in this moment, however, we want demonstrate that for the weight and volume of the premature baby's eye, we need a low dosis and then we will have less sistemic effect.

HYPOTHESIS:The injection of 0.500 mg of Bevacizumab intravitreal it isnt lower that 0.625 mg of Bevacizumab intravitreal for the regression of ROP type 1 OBJECTIVE: Demonstrate that 0.500mg of Bevacizumab intravitreal isn't inferior that 0.625mg in the resolution of ROP type 1.

METHODOLOGY: No inferiority study. ECCA. We are going to include premature patients prematures with less of 32SDG and/or 1500g and less of 36SDG with factors risk. They are going to be examined in the week fourth, with de diagnosis for ROP type 1, we are going to inject intravitreal Bevacizumab, with the dosis randomized (0.500mg and 0.625mg) and they are going to be examined another time at first week, two weeks, first month, and for the second to sixth month after the treatment, for warrant la resolution of ROP. The size simple is 30 patients for group (Dosis A and Dosis B).

We are going to describe the date of the infection, and the age of the baby when the bevacizumab was inyected. When the ROP have been in regression, we are going to describe the date, and finally we are going to describe the age is going to be the baby she the ROP have been in regression.