Which condition is the most common cause of newborn respiratory distress?

• A. Meconium aspiration syndrome (MAS)
• B. Respiratory distress syndrome (RDS)
• C. Transient tachypnea of the newborn (TTN)
• D. Persistent pulmonary hypertension (PPHTN)

Answer: (C)

The most common cause of newborn respiratory distress is indeed respiratory distress syndrome (RDS). This condition primarily affects preterm infants and arises due to insufficient surfactant in the lungs, which is critical for maintaining alveolar stability and reducing surface tension. Without adequate surfactant, the alveoli collapse, leading to impaired gas exchange, hypoxia, and respiratory distress.

In the context of newborns, RDS is particularly prevalent because premature infants are at a higher risk due to underdeveloped lungs. This condition typically presents within the first few hours of life and can be distinguished by clinical signs such as increased work of breathing, grunting, and cyanosis.

While transient tachypnea of the newborn (TTN) is a common condition characterized by mild respiratory distress due to fluid retention in the lungs, it generally resolves within a few days, making RDS the more significant concern for severity and commonality in causing respiratory distress in neonates. Meconium aspiration syndrome (MAS) and persistent pulmonary hypertension are also important considerations in newborn respiratory issues but are less common overall than RDS in terms of causing distress in the immediate neonatal period.