What are common reactions to transfused blood products?

What are common reactions to transfused blood products?

• A. Only allergic reactions.
• B. Infectious/viral transfers, hypocalcemia, hyperkalemia, decreased 2,3-DPG, hypothermia, TRALI, and TACO.
• C. Transfusions never cause electrolyte disturbances.
• D. There are no infectious risks with modern blood products.

Answer: (B)

Transfusion reactions span metabolic disturbances, immune-mediated lung injuries, volume-related complications, and infectious risks, all of which can occur with blood product administration. The most comprehensive understanding is that transfusion can cause shifts in electrolytes and temperature, impair oxygen delivery from stored blood, and provoke lung injury or volume overload, in addition to rare infectious transmissions. Calcium can drop because citrate anticoagulant in stored blood binds calcium, leading to hypocalcemia with symptoms like tingling, a potential for cardiac effects, and sometimes paresthesias or hypotension; treating symptomatic cases with calcium helps prevent progression. Potassium leaks from stored red cells raise the risk of hyperkalemia, particularly with rapid or massive transfusions, which can impact cardiac conduction. Stored blood also loses 2,3-DPG, shifting the oxyhemoglobin dissociation curve to the left, meaning hemoglobin holds onto oxygen more tightly and less is delivered to tissues initially; this effect diminishes as the blood circulates and the patient’s own 2,3-DPG levels recover. Cooling of the product can cause hypothermia if large volumes are transfused quickly, with its own cardiovascular and coagulation implications. Beyond these metabolic and physical changes, two major immune-related risks can occur within hours of transfusion: transfusion-related acute lung injury and transfusion-associated circulatory overload. TRALI presents as acute hypoxemia and noncardiogenic pulmonary edema after transfusion, requiring stopping the product and supportive care. TACO is a volume overload syndrome that mimics heart failure, with hypertension, JVD, crackles, and pulmonary edema, necessitating slower administration and diuresis as appropriate. In addition, infectious risks remain possible, albeit very low with current screening, and platelets can carry a higher risk for bacterial sepsis than other products. This combination of electrolyte disturbances, oxygen delivery changes, hypothermia, and the notable noninfectious complications (TRALI and TACO), along with the still-present albeit rare infectious risk, makes this option the most complete description of common transfusion reactions.

Transfusion reactions span metabolic disturbances, immune-mediated lung injuries, volume-related complications, and infectious risks, all of which can occur with blood product administration. The most comprehensive understanding is that transfusion can cause shifts in electrolytes and temperature, impair oxygen delivery from stored blood, and provoke lung injury or volume overload, in addition to rare infectious transmissions.

Calcium can drop because citrate anticoagulant in stored blood binds calcium, leading to hypocalcemia with symptoms like tingling, a potential for cardiac effects, and sometimes paresthesias or hypotension; treating symptomatic cases with calcium helps prevent progression. Potassium leaks from stored red cells raise the risk of hyperkalemia, particularly with rapid or massive transfusions, which can impact cardiac conduction. Stored blood also loses 2,3-DPG, shifting the oxyhemoglobin dissociation curve to the left, meaning hemoglobin holds onto oxygen more tightly and less is delivered to tissues initially; this effect diminishes as the blood circulates and the patient’s own 2,3-DPG levels recover. Cooling of the product can cause hypothermia if large volumes are transfused quickly, with its own cardiovascular and coagulation implications.

Beyond these metabolic and physical changes, two major immune-related risks can occur within hours of transfusion: transfusion-related acute lung injury and transfusion-associated circulatory overload. TRALI presents as acute hypoxemia and noncardiogenic pulmonary edema after transfusion, requiring stopping the product and supportive care. TACO is a volume overload syndrome that mimics heart failure, with hypertension, JVD, crackles, and pulmonary edema, necessitating slower administration and diuresis as appropriate. In addition, infectious risks remain possible, albeit very low with current screening, and platelets can carry a higher risk for bacterial sepsis than other products.

This combination of electrolyte disturbances, oxygen delivery changes, hypothermia, and the notable noninfectious complications (TRALI and TACO), along with the still-present albeit rare infectious risk, makes this option the most complete description of common transfusion reactions.