How does overfeeding in pulmonary insufficiency lead to respiratory acidosis?

How does overfeeding in pulmonary insufficiency lead to respiratory acidosis?

• A. Increased CO2 production from glucose metabolism and lipogenesis
• B. Decreased CO2 production
• C. Increased bicarbonate production
• D. Increased CO2 production from glucose metabolism and lipogenesis

Answer: (D)

Overfeeding increases CO2 production, especially when we deliver excess carbohydrates. carbohydrate metabolism has a high respiratory quotient, meaning more CO2 is produced for a given amount of oxygen consumed. In pulmonary insufficiency, the lungs can’t blow off that extra CO2 efficiently, so CO2 accumulates in the blood. This buildup lowers the blood pH, producing respiratory acidosis. Even fat synthesis (lipogenesis) from excess carbohydrate adds to the CO2 burden because the carbon coming from glucose eventually cycles through metabolic pathways that generate CO2. So the combination of increased CO2 production from glucose metabolism and fat synthesis drives the acidosis when ventilation is limited. That’s why increased CO2 production is the key mechanism here. Not decreased CO2 production and not increased bicarbonate production would cause acidosis, which is why the other options don’t fit.

Overfeeding increases CO2 production, especially when we deliver excess carbohydrates. carbohydrate metabolism has a high respiratory quotient, meaning more CO2 is produced for a given amount of oxygen consumed. In pulmonary insufficiency, the lungs can’t blow off that extra CO2 efficiently, so CO2 accumulates in the blood. This buildup lowers the blood pH, producing respiratory acidosis. Even fat synthesis (lipogenesis) from excess carbohydrate adds to the CO2 burden because the carbon coming from glucose eventually cycles through metabolic pathways that generate CO2. So the combination of increased CO2 production from glucose metabolism and fat synthesis drives the acidosis when ventilation is limited. That’s why increased CO2 production is the key mechanism here. Not decreased CO2 production and not increased bicarbonate production would cause acidosis, which is why the other options don’t fit.