After days of phototherapy, the bilirubin level of the patient in Question 5 declines below mg/dL One day off phototherapy, the level of bilirubin remains less than mg/dL The patient is discharged home and grows well while breast-feeding At month of age, he returns with significant pallor, tachycardia, and a new heart murmur The most likely problem at this time is

Correct Answer: B

Rationale: Ductal-dependent congenital heart disease may manifest after ductus arteriosus closure

Correct Answer: D

Rationale: Diphasic stridor (occurring during both inspiration and expiration) suggests a more severe upper airway obstruction, commonly seen in severe laryngitis or subglottic stenosis.

Correct Answer: B

Rationale: The anion gap is calculated as Na - (Cl + HCO3) and represents unmeasured anions like lactate, phosphate, and proteins. It is useful in metabolic acidosis evaluation.

Correct Answer: B

Rationale: Abdominal masses are the most frequent clinical presentation in pediatric Non-Hodgkin lymphoma, often due to involvement of the intestines or lymphatic tissue.

Correct Answer: B

Rationale: Use of hallucinogens significantly increases the risk score due to its potential for severe psychological and physical harm.