Which of the following conditions is likely to result in lactic acidosis?

• A. Hyperventilation
• B. Severe infection
• C. Chronic obstructive pulmonary disease
• D. Hypotension

Answer: (B)

Lactic acidosis occurs when there is an excess of lactic acid in the body, typically due to insufficient oxygen delivery to tissues, leading to anaerobic metabolism. Severe infection, particularly when it leads to sepsis, can result in tissue hypoxia and impaired circulation due to a systemic inflammatory response. This inadequate oxygen supply to tissues drives the body to switch from aerobic to anaerobic metabolism, causing an accumulation of lactic acid.

In the context of severe infection, the interplay of factors such as increased metabolic demand, decreased oxygen delivery to tissues, and the potential for multiple organ dysfunction contributes to lactic acidosis. Understanding this connection highlights how severe systemic infection can lead directly to metabolic perturbations like lactic acidosis through mechanisms that include inadequate oxygenation and altered perfusion.

Other conditions can also contribute to lactic acidosis, but they operate through different mechanisms: for instance, while hypotension may lead to inadequate perfusion similarly to infection, it often does not involve the systemic inflammatory responses seen in sepsis. Hyperventilation is more likely to lead to respiratory alkalosis due to decreased carbon dioxide levels. Chronic obstructive pulmonary disease may lead to respiratory acidosis and not lactic acidosis, as its major metabolic disturbances are related to CO2