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Difficulty: MediumPhysiological Adaptation

A client in the emergency department is receiving a rapid transfusion of multiple units of packed red blood cells (PRBCs) following a severe pelvic fracture. During the transfusion of the fifth unit, the nurse observes prolonged QT intervals on the cardiac monitor, and the client reports new-onset tingling in their fingers and around their mouth. Which physiological complication should the nurse recognize based on these assessment findings?

  1. Citrate toxicity leading to a decreased serum ionized calcium levelAnswer
  2. B
    Compensatory respiratory alkalosis resulting from acute hyperventilation
  3. C
    Decreased tissue perfusion indicating the progression of early hemorrhagic shock
  4. D
    An acute hemolytic reaction resulting from intravenous fluid incompatibility

Answer

The client is experiencing citrate toxicity leading to a decreased serum ionized calcium level.
The correct answer identifies that packed red blood cells contain citrate as a preservative to prevent coagulation. When multiple units are transfused rapidly, the liver cannot metabolize the citrate quickly enough. The excess citrate in the bloodstream binds with free ionized calcium, leading to acute hypocalcemia. Clinical manifestations of hypocalcemia include neuromuscular irritability (such as circumoral and extremity tingling) and cardiac conduction delays, most notably a prolonged QT interval.

Step-by-Step Solution

1
Analyze the client's current clinical presentation and recent medical interventions.
The client is receiving a rapid, massive transfusion of PRBCs and is developing new-onset circumoral tingling, finger numbness, and a prolonged QT interval.
Identifying the temporal relationship between a therapy (massive transfusion) and new symptoms is essential for recognizing unexpected physiological adaptations.
2
Correlate the specific assessment findings with physiological imbalances.
Neuromuscular irritability (tingling) and a prolonged QT interval on the electrocardiogram are classic hallmark signs of hypocalcemia.
Connecting specific cardiac and neuromuscular signs to their underlying electrolyte disturbance allows for accurate clinical judgment.
3
Link the identified electrolyte imbalance to the medical intervention.
The citrate preservative in stored PRBCs binds to the client's ionized calcium, resulting in clinically significant hypocalcemia when transfused rapidly.
Understanding the pharmacological components of blood products is necessary to anticipate and manage massive transfusion complications.

Key Concept

Massive blood transfusions can lead to acute hypocalcemia (citrate toxicity) because the citrate preservative added to stored blood binds with the client's serum ionized calcium. Nurses must monitor for signs of hypocalcemia, including neuromuscular irritability (tingling, Chvostek's/Trousseau's signs) and electrocardiogram changes such as prolonged QT intervals.
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Topics

Physiological Adaptation

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