In ROP management, which statement best describes the relative importance of oxygen control?

• A. Higher oxygen saturation in the second phase is more important than controlling oxygen in the first phase
• B. Oxygen fluctuations during the first weeks have no impact on ROP risk
• C. Maintaining a constant midrange saturation (70-80%) is essential in all phases
• D. Controlling oxygen in the first phase is more important than having higher oxygen saturation in the second phase

Answer: (D)

In ROP, what you do with oxygen early on has the biggest impact on disease development. During the first weeks after birth, the premature retina is highly sensitive to oxygen levels. Excessive oxygen and fluctuations during this initial phase can blunt normal retinal vessel growth, creating an avascular retina. As oxygentension changes later, that avascular retina becomes hypoxic and drives pathological neovascularization in the second phase. So, prioritizing careful, stabilized oxygen control in the first phase reduces the trigger for the abnormal neovascular response more than trying to maximize oxygen saturation later.

The idea that higher oxygen saturation in the second phase would outweigh early-phase control isn’t supported by how ROP develops, and fluctuations in the early weeks do increase risk. A fixed midrange target for all phases isn’t universally endorsed, and simply aiming for a higher second-phase saturation doesn’t address the critical early vascular disruption. The key takeaway is that preventing early-phase oxygen excess and instability is the most influential strategy to reduce ROP risk.