Which factor contributes to metabolic acidosis in newborns?

• A. Excessive insulin production
• B. Higher lactic acid production
• C. Low glucose levels
• D. Stable oxygen consumption

Answer: (B)

The correct factor contributing to metabolic acidosis in newborns is higher lactic acid production. In newborns, especially those experiencing stress during birth or in the early neonatal period, there may be conditions that lead to anaerobic metabolism, which results in the production of lactic acid. This increased lactic acid in the bloodstream contributes to a decrease in blood pH, which is characteristic of metabolic acidosis.

In the context of newborns, conditions such as hypoxia or impaired tissue perfusion can precipitate this process. When tissues are not sufficiently oxygenated, the body shifts from aerobic to anaerobic metabolism to generate energy, significantly increasing lactic acid levels. Hence, the metabolic equilibrium is altered, leading to acidosis.

While the other factors listed may influence metabolic processes in newborns, they do not directly cause metabolic acidosis in the same manner as elevated lactic acid levels. For instance, excessive insulin production is more commonly associated with hypoglycemia than acidosis, and low glucose levels primarily lead to hypoglycemia rather than acidosis. Similarly, stable oxygen consumption would not contribute to metabolic acidosis since it implies adequate metabolic function instead of the shift to anaerobic metabolism.