Which condition is characterized by pulmonary edema resulting from delayed resorption and clearance of fetal alveolar fluid?

• A. Transient tachypnea of the newborn (TTN)
• B. Meconium aspiration syndrome
• C. Respiratory distress syndrome
• D. Chronic lung disease

Answer: (A)

Transient tachypnea of the newborn (TTN) is characterized by pulmonary edema due to delayed resorption and clearance of fetal alveolar fluid. This condition typically occurs shortly after birth, often seen in full-term or near-term infants, particularly those born via cesarean delivery without labor. In TTN, the fluid in the lungs does not clear quickly enough, leading to respiratory distress as the infant struggles to adjust to breathing air. The symptoms often present as increased respiratory rate, mild retractions, and occasionally, oxygen requirement, yet the infant typically resolves this condition within a few days as the fluid clears.

The other conditions listed have different underlying mechanisms. Meconium aspiration syndrome is caused by the inhalation of meconium-stained amniotic fluid, leading to aspiration-related airway obstructions and lung inflammation, rather than fluid resorption issues. Respiratory distress syndrome arises from insufficient surfactant production, primarily affecting preterm infants, resulting in atelectasis and poor lung expansion. Chronic lung disease, or bronchopulmonary dysplasia, is a condition seen primarily in premature infants who receive oxygen and mechanical ventilation, leading to lung injury and scarring from prolonged oxygen exposure and mechanical ventilation rather than an issue of fluid clearance.