Most common cause of respiratory distress after birth in first 24 hours is –
**Core Concept**
The question is testing the knowledge of a critical condition that can cause respiratory distress in newborns. The underlying principle is the pathophysiology of respiratory distress syndrome (RDS), which is a leading cause of respiratory distress in preterm infants.
**Why the Correct Answer is Right**
Respiratory distress syndrome (RDS) is caused by a deficiency of surfactant in the lungs, leading to atelectasis and impaired gas exchange. Surfactant is a complex mixture of phospholipids and proteins that reduces surface tension in the alveoli, allowing for easier lung expansion during inhalation. Preterm infants have a deficiency of surfactant due to the immaturity of their lungs, making them more susceptible to RDS.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a condition that is directly related to respiratory distress in newborns.
* **Option B:** This option is incorrect because it refers to a condition that is more commonly associated with older children and adults, such as bronchiolitis or chronic obstructive pulmonary disease (COPD).
* **Option C:** This option is incorrect because it is not a common cause of respiratory distress in newborns.
**Clinical Pearl / High-Yield Fact**
One key point to remember is that respiratory distress syndrome (RDS) is a leading cause of respiratory distress in preterm infants, and it is often associated with a history of prematurity, low birth weight, and a lack of surfactant in the lungs.
**Correct Answer: A. Transient Tachypnea of Newborn (TTN) is not the answer here, I will give you the correct answer for the sake of this exercise: B. Meconium Aspiration Syndrome (MAS) is a leading cause of respiratory distress in the first 24 hours of life.