Which of the following complications is most likely to occur after recieving several units of blood transfusion?
## **Core Concept**
The question tests the understanding of potential complications arising from blood transfusions, specifically focusing on the risks associated with receiving several units of blood. Blood transfusions can lead to various complications, including immune reactions, transmission of infectious diseases, and alterations in the recipient's physiological state.
## **Why the Correct Answer is Right**
The correct answer, **C. Citrate toxicity leading to hypocalcemia**, is a well-recognized complication of massive blood transfusions. Citrate is used as an anticoagulant in blood bank storage solutions. It chelates calcium ions, which are essential for the coagulation cascade. When large volumes of citrate-containing blood products are transfused rapidly, the citrate can bind to calcium, potentially leading to hypocalcemia. This condition can manifest clinically as muscle cramps, tetany, or more severe cardiovascular instability.
## **Why Each Wrong Option is Incorrect**
- **Option A:** While hemolysis can occur due to ABO incompatibility or other immune-mediated reactions, it is not the most likely complication directly associated with the receipt of "several units" of blood transfusion, assuming proper cross-matching has been performed.
- **Option B:** Transfusion-related acute lung injury (TRALI) is a serious complication of blood transfusion but is not as directly related to the volume of blood transfused as citrate toxicity.
- **Option D:** Transmissible infections are a risk with blood transfusions but are not specifically related to the immediate effects of receiving "several units" of blood.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that citrate toxicity leading to hypocalcemia is a risk in massive transfusion protocols. Monitoring of calcium levels and consideration of calcium supplementation may be necessary in such cases. The risk increases with the volume of blood products transfused and the rate of transfusion.
## **Correct Answer:** . Citrate toxicity leading to hypocalcemia