PE19.17 | Oxygen Toxicity — Summary & Reflection

KEY TAKEAWAYS

Oxygen toxicity in neonates is a preventable cause of childhood blindness (ROP) and chronic lung disease (BPD), occurring when premature infants with immature antioxidant defences and incomplete retinal vascularisation are exposed to supraphysiological oxygen levels. The key principles: (1) target SpO2 90–95% in all preterm neonates on supplemental oxygen — supported by SUPPORT, BOOST II, and COT trials; (2) screen all infants with GA ≤34 weeks or BW ≤1800g for ROP starting at 31 weeks corrected age or 4 weeks of life; (3) ROP zones (I posterior, III peripheral), stages (1 = line, 5 = total detachment), and plus disease drive treatment decisions; (4) Type 1 ROP (Zone I any stage + plus; Zone I Stage 3; Zone II Stage 2–3 + plus) requires treatment within 48–72 hours with laser or anti-VEGF; (5) BPD = oxygen need at 36 weeks CGA; manage PAH with sildenafil, support nutrition, and wean oxygen as tolerated over months; (6) missing the ROP screening window is a preventable catastrophe — ensure ophthalmology follow-up is booked before NICU discharge.

REFLECT

Baby Priya is now being discharged at 38 weeks corrected age. She no longer requires CPAP but still needs 0.1 L/min nasal cannula oxygen to maintain SpO2 >90%. The ophthalmologist screened her at 31 and 34 weeks corrected age — her ROP has regressed to Stage 2 Zone II without plus disease and does not require treatment. Her parents are anxious: 'Will she go blind? Will she need oxygen forever?' Reflect on: (1) How do you counsel the parents about the trajectory of Stage 2 Zone II ROP without plus — what are the next steps in ophthalmology follow-up? (2) What does Priya's continued oxygen requirement at 38 weeks tell you about her BPD classification, and what home management will she need? (3) What would you write in the discharge summary to ensure the receiving paediatrician and community health worker understand the ongoing monitoring needed?