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) is not a component of the recognized 'lethal triad' associated with massive trauma and transfusion.
The lethal triad is a specific, well-defined vicious cycle consisting of three interconnected conditions: acidosis, hypothermia, and coagulopathy.
While massive fluid resuscitation can lead to various electrolyte disturbances, hyponatremia is not one of the core pillars of this life-threatening cascade.

Option A: Acidosis is a core component of the lethal triad. It results from tissue hypoperfusion (shock) and impairs both cardiac function and the enzymatic coagulation cascade, thus worsening bleeding.
Option B: Hypothermia is a core component of the lethal triad. It is often induced by the administration of large volumes of cold fluids and blood products and directly inhibits the function of platelets and clotting factors.
Option C: Coagulopathy is a core component of the lethal triad. It is caused by the dilution of clotting factors and platelets during resuscitation and is exacerbated by both acidosis and hypothermia, leading to a cycle of uncontrolled bleeding.

Visual 1: Diagram - A circular flowchart illustrating the vicious cycle of the 'Lethal Triad of Trauma,' showing how acidosis, hypothermia, and coagulopathy each lead to and worsen the others.

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 actively warming the patient with blankets and forced-air warmers, using a blood warmer for all transfusions, and closely monitoring vital signs, core temperature, and laboratory results (coagulation studies, ABGs).
Prompt recognition and communication of changes in temperature, pH, or signs of bleeding are essential for the interdisciplinary team to intervene quickly.
What if? If the patient develops circumoral paresthesia (tingling around the mouth) and cardiac dysrhythmias during the transfusion, the nurse should suspect hypocalcemia. This is caused by the citrate anticoagulant in blood products binding to the patient's calcium. The nurse should notify the provider immediately, as intravenous calcium 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 evaluate each option against this definition.
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: electrolyte, metabolic abnormalities, lethal triad, massive blood transfusion
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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