Which of the following electrolyte or metabolic abnormalities is NOT a component of the lethal triad associated with massive blood transfusion?

Appeared in: AIIMS Raipur NO - 2017 (Shift-1)

Explanation

Hyponatremia (low sodium level) is not considered a component of the lethal triad associated with massive blood transfusion.
The lethal triad is a well-defined clinical syndrome consisting of three specific, interrelated conditions that create a vicious cycle of worsening hemorrhage and shock.
The three components of the lethal triad are acidosis, hypothermia, and coagulopathy.
While other electrolyte abnormalities like hypocalcemia and hyperkalemia can occur during massive transfusion, hyponatremia is not one of the defining elements of this critical triad.

Option A: Acidosis is a core component of the lethal triad. It results from tissue hypoperfusion (shock) and impairs both cardiac contractility and the function of clotting enzymes.
Option B: Hypothermia is a core component of the lethal triad. It is caused by the infusion of large volumes of cold blood products and significantly worsens coagulopathy by impairing platelet and enzyme function.
Option C: Coagulopathy is a core component of the lethal triad. It arises from the dilution of clotting factors and platelets, as well as the direct inhibitory effects of acidosis and hypothermia on the clotting cascade.

Clinical Relevance

Nursing practice connection: Knowing Lethal Triad of Massive Blood Transfusion helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses play a critical role in preventing and managing the lethal triad during massive transfusion by using a blood warmer for all transfusions, monitoring the patient's core temperature, frequently assessing for signs of bleeding, and ensuring coagulation profiles (platelets, fibrinogen, PT/PTT) are monitored.
Early activation of a Massive Transfusion Protocol (MTP) is crucial. This ensures a balanced resuscitation with red cells, plasma, and platelets, which helps prevent dilutional coagulopathy.
What if? If the patient develops circumoral paresthesia (tingling around the mouth) and ECG changes during a massive transfusion, the nurse should suspect hypocalcemia. This is because citrate in the transfused blood binds with calcium. The nurse should notify the provider immediately, as calcium infusion may be required.

How to Approach the Question

First, identify the negative keyword 'NOT' in the question stem. This means you are looking for the option that does not belong.
Next, recall the definition of the 'lethal triad' associated with massive blood loss and transfusion.
The triad consists of three specific, interconnected conditions. Systematically review the options.
Option A, Acidosis, is a known component.
Option B, Hypothermia, is a known component.
Option C, Coagulopathy, is a known component.

Concept Tested & Keywords

Concept Tested: Lethal Triad of Massive Blood Transfusion
Stem keywords: lethal triad, massive blood transfusion, electrolyte abnormalities, metabolic abnormalities
Lead-in keywords: NOT
Negative lead-in flag: The question asks to identify the component that is NOT part of the lethal triad.

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E6 Medicine Harrison 22e Part 1 p. 953-955

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