Bronchopulmonary dysplasia is defined as a chronic lung condition that results from treatment of RDS with MV or high concentrations of O2 for more than how many days?

• A. 28 days
• B. 14 days
• C. 60 days
• D. 29 days

Answer: (D)

The main idea is how long a neonate must need respiratory support before labeling it as bronchopulmonary dysplasia. This condition is defined in part by the duration of oxygen therapy or mechanical ventilation after birth. Historically, BPD is recognized when oxygen support or MV is required for more than 28 days, signaling a transition from acute newborn respiratory distress to a chronic lung condition. Because the question asks for “more than” a certain number of days, the smallest day count that satisfies that phrase is 29 days. So 29 days (or more) fits the definition. Modern practice can also use postnatal age or postmenstrual age criteria, but the classic exam standard uses the >28 days threshold.