The nurse reviews the orders and identifies this infant most likely has which of the following?

Rationale: A. A heart defect with increased pulmonary blood flow: Increased pulmonary blood flow defects (such as VSD or PDA) typically present with higher oxygen saturations and signs of pulmonary congestion. Infants with these defects usually do not require oxygen restriction, as supplemental oxygen generally improves saturations without causing hemodynamic instability. B. A heart defect with a left to right shunt: Left-to-right shunts send oxygenated blood back to the lungs, increasing pulmonary flow and often raising oxygen saturation levels. These infants usually show tachypnea and feeding difficulty but maintain higher O₂ levels than 82%. C. A heart defect with a right to left shunt: Cyanotic heart defects with right-to-left shunting reduce pulmonary blood flow, leading to low baseline oxygen saturations. These infants require controlled oxygen delivery to prevent altering pulmonary vascular resistance, and target ranges like 75–85% are typical. The low saturation despite room air and oxygen restriction strongly indicate a right-to-left shunting lesion. D. An obstructive heart defect: Obstructive defects such as coarctation or pulmonary stenosis may affect perfusion or cause shock, but they do not usually produce stable low oxygen saturation targets like 75–85%. These conditions more commonly lead to poor pulses or blood pressure variability.