The most serious complication of acute hemolytic anemia in G6PD deficiency is:
**Core Concept**
Acute hemolytic anemia in G6PD deficiency occurs due to the oxidation of red blood cell hemoglobin, leading to cell membrane damage and hemolysis. This condition is triggered by various factors, including infection, certain medications, and exposure to oxidizing agents.
**Why the Correct Answer is Right**
The correct answer is **B. Renal failure**. This occurs due to the accumulation of bilirubin and its metabolites, which lead to the formation of oxalate crystals in the renal tubules. This results in acute tubular necrosis and renal failure. The enzyme G6PD deficiency leads to a lack of NADPH, which is essential for the reduction of oxidized glutathione. As a result, the antioxidant defenses of the red blood cell are compromised, leading to oxidative damage and hemolysis.
**Why Each Wrong Option is Incorrect**
**Option A:** **Hemorrhagic stroke** is not a direct complication of acute hemolytic anemia in G6PD deficiency. While anemia can lead to increased cardiac output and potential for hemorrhage, this is not the most serious complication.
**Option C:** **Acute liver failure** is not a direct consequence of G6PD deficiency. While liver dysfunction can occur in severe cases of hemolysis, it is not the most serious complication.
**Clinical Pearl / High-Yield Fact**
G6PD deficiency is a common cause of acute hemolytic anemia worldwide, particularly in populations of Mediterranean, African, and Asian descent. It is essential to recognize this condition and avoid triggering factors to prevent severe hemolysis.
**Correct Answer: B. Renal failure**