After the RTA, a patient was brought to the emergency department. After Massive blood transfusion, which electrolyte imbalance occurs in the patient?

1. A

   Hypocalcemia

2. B

   Hypokalaemia

3. C

   Hyponatremia

4. D

   Hyperthermia

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

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• Hypocalcemia is the correct answer because stored blood products contain citrate as an anticoagulant.
• Citrate binds to (chelates) free ionized calcium in the recipient's blood, effectively removing it from circulation.
• During a massive transfusion, the large volume of citrate administered overwhelms the liver's capacity to metabolize it, causing a rapid and significant drop in serum calcium levels.
• This can lead to clinical signs of hypocalcemia, including neuromuscular irritability (tetany) and cardiac dysrhythmias.

Why Other Options Were Wrong

• Option B: Hypokalaemia (low potassium) is incorrect. The more significant risk during massive transfusion is hyperkalemia (high potassium).
• Option C: Hyponatremia (low sodium) is not a direct or common complication of massive blood transfusion.
• Option D: Hyperthermia (high body temperature) is incorrect. The actual risk related to temperature is hypothermia (low body temperature).

Related Visual

• Visual 1: Flowchart - Illustrating the pathway from citrate infusion during massive transfusion to the chelation of calcium, leading to hypocalcemia.
• Visual 2: Infographic - Summarizing the 'lethal triad' of trauma (acidosis, hypothermia, coagulopathy) and adding the key electrolyte imbalances (hypocalcemia, hyperkalemia) associated with massive transfusion.

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Electrolyte imbalances following massive blood transfusion in acute care settings.
• A nurse's primary role during a massive transfusion is vigilant monitoring for complications. Recognizing the signs of hypocalcemia, such as tingling, muscle cramps, and ECG changes (prolonged QT interval), is critical for patient safety.
• Nurses must anticipate the need for electrolyte correction and have emergency medications like IV calcium gluconate readily available as per protocol.
• What if the patient had pre-existing liver failure? The risk of citrate-induced hypocalcemia would be significantly higher because the liver is the primary site for citrate metabolism. In such patients, more frequent monitoring and earlier intervention would be essential.

How to Approach the Question

• First, identify the key clinical event in the question: 'Massive blood transfusion'.
• Recall the major complications associated with this procedure. Think about the components of stored blood and the effects of rapid, large-volume infusion.
• Consider the anticoagulant used in blood bags, which is citrate. Remember its primary effect: it binds to calcium.
• Evaluate each option based on this knowledge. Hypocalcemia is a direct result of citrate toxicity.
• Eliminate the other options by recalling the correct associated complications: Hyperkalemia (not hypo-) from cell lysis, and Hypothermia (not hyper-) from cold fluid infusion.
• This systematic approach of linking the procedure to its known pathophysiological consequences leads to the correct answer.

Concept Tested & Keywords

• Concept Tested: Electrolyte imbalances following massive blood transfusion
• Stem keywords: Massive blood transfusion, electrolyte imbalance, RTA, emergency department
• Lead-in keywords: which
• Clinical cues: The patient has undergone a massive blood transfusion, which is a key trigger for specific metabolic complications.

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