Massive transfusion is defined as the replacement of a patient's total blood volume in a 24-hour period. This is clinically approximated as the transfusion of how many units of packed red blood cells (PRBCs) within 24 hours for an adult?

1. A

   3 units

2. B

   5 units

3. C

   10 units

4. D

   20 units

Appeared in: NORCET 9 Prelims-2025

Explanation

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• Massive transfusion is clinically defined as the administration of 10 or more units of packed red blood cells (PRBCs) to an adult patient within a 24-hour period.
• This definition serves as a critical threshold for activating a hospital's Massive Transfusion Protocol (MTP).
• The goal of an MTP is to rapidly restore blood volume and prevent dilutional coagulopathy by providing a balanced ratio of blood components.
• An average adult's blood volume is about 5 liters; 10 units of PRBCs represents a significant loss of approximately 2.5-3 liters, necessitating an emergency protocol.

Why Other Options Were Wrong

• Option A: Transfusing 3 units of PRBCs is considered a standard transfusion for moderate anemia or blood loss, not a massive transfusion.
• Option B: While transfusing 5 units is significant, it does not meet the clinical definition for a massive transfusion.
• Option D: Transfusing 20 units is double the amount used to define a massive transfusion. While a patient might receive this volume during a prolonged resuscitation, it is not the initial defining threshold.

Related Visual

• Visual 1: Flowchart - A flowchart illustrating the steps for activating and managing a Massive Transfusion Protocol (MTP), including triggers, component ratios, and monitoring parameters.
• Visual 2: Infographic - An infographic comparing the volume and contents of one unit of Packed RBCs, Fresh Frozen Plasma, and Platelets to visually explain the concept of component therapy.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Definition of Massive Transfusion to guide bedside assessment, documentation, and the next nursing action.
• Recognizing the triggers for a massive transfusion is a critical nursing responsibility in emergency, trauma, and critical care settings.
• Nurses play a key role in activating the MTP, ensuring rapid IV access, administering blood products correctly, and monitoring the patient for response and complications like transfusion reactions, hypothermia, and electrolyte imbalances (hyperkalemia, hypocalcemia).
• What if? - If a patient received 8 units of PRBCs over 3 hours instead of 24 hours, this would also be considered a massive transfusion based on the alternative definition of replacing >50% of blood volume in <3 hours, and an MTP should be activated.

How to Approach the Question

• This is a factual recall question that tests your knowledge of a specific clinical definition.
• First, identify the key term in the question: 'Massive transfusion'.
• Recall the clinical definition of this term, specifically the number of PRBC units transfused within a 24-hour period for an adult.
• Evaluate the given options against this definition.
• Select the option that matches the established clinical standard, which is 10 units.

Concept Tested & Keywords

• Concept Tested: Definition of Massive Transfusion
• Stem keywords: Massive transfusion, total blood volume, 24-hour period, packed red blood cells (PRBCs), adult
• Lead-in keywords: how many units

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QCqTVojOBEMGfJBB1wFGJe

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