What is a potential complication for an infant born at 26 weeks gestation who receives excessive oxygen therapy?

Choice A rationale Excessive oxygen in the premature infant's retina causes vasoconstriction and subsequent obliteration of developing blood vessels. When oxygen is reduced or removed, a neovascularization phase begins, where abnormal, fragile blood vessels proliferate. These vessels can hemorrhage or cause traction on the retina, leading to detachment and potential blindness. This condition is known as Retinopathy of Prematurity (ROP). Choice B rationale Necrotizing Enterocolitis (NEC) is a gastrointestinal emergency primarily affecting premature infants. It involves inflammation and necrosis of the intestinal wall. While the exact etiology is multifactorial, including intestinal ischemia, immature immunity, and enteral feeding, excessive oxygen therapy is not directly recognized as the primary cause. NEC results from a breakdown in the mucosal barrier and subsequent bacterial invasion. Choice C rationale Congenital Heart Defects (CHDs) are structural abnormalities of the heart or great vessels present at birth. These defects arise from abnormal cardiac development during the fetal period, typically in the first trimester of gestation. They are primarily linked to genetic, chromosomal, or environmental factors (e.g., maternal infections, teratogens), not postnatal oxygen therapy for prematurity. Choice D rationale Pulmonary Hypertension (PH) in a premature infant is high blood pressure in the arteries of the lungs. While chronic lung disease of prematurity (bronchopulmonary dysplasia) can lead to PH due to alveolar damage and pulmonary vascular remodeling, acute, transient excessive oxygen therapy is not the typical sole or direct cause. It is more commonly associated with persistent pulmonary hypertension of the newborn (PPHN) or chronic lung issues.