After an RTA, a patient came to the emergency department with massive blood loss. Which color cannula would be used by a prudent nurse to administer a large amount of fluid or blood?

1. A

   Grey

2. B

   Green

3. C

   Blue

4. D

   Pink

Appeared in: NORCET 2 - 2021 (shift-1)

Explanation

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• In cases of massive blood loss, rapid fluid and blood resuscitation is critical to prevent hypovolemic shock.
• The flow rate of an IV cannula is inversely proportional to its gauge number; a smaller gauge number means a larger cannula diameter and a higher flow rate.
• Among the options provided, the Grey cannula has the largest bore (16 Gauge) and the highest flow rate (approximately 180 mL/min).
• This high flow rate is essential for administering large volumes of fluid or blood quickly, making it the ideal choice in a trauma setting like an RTA.

Why Other Options Were Wrong

• Option B: A Green (18G) cannula has a flow rate of about 90 mL/min. While suitable for routine blood transfusions and many surgical patients, it is half as fast as a Grey cannula and may not be sufficient for rapid resuscitation in a patient with massive hemorrhage.
• Option C: A Blue (22G) cannula has a very small bore and a low flow rate (around 36 mL/min). It is completely inadequate for rapid volume replacement in a trauma patient and would dangerously delay treatment.
• Option D: A Pink (20G) cannula offers a moderate flow rate (around 60 mL/min). While one of the most commonly used cannulas for routine IV therapy, its flow rate is insufficient for a patient experiencing massive blood loss.

Related Visual

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing IV cannula selection for rapid fluid resuscitation in trauma in acute care settings.
• In trauma, 'time is tissue.' Establishing large-bore IV access (e.g., two 16G or 14G cannulas) is a priority nursing action to enable rapid response to hypovolemia and prevent irreversible shock.
• Nurses must be prepared to use pressure bags and fluid warmers in conjunction with large-bore cannulas to accelerate infusion rates and prevent hypothermia from the rapid administration of cold fluids or blood.
• What if? If the patient were a frail 85-year-old with fragile veins needing a routine antibiotic, the answer would change. A Blue (22G) or Pink (20G) cannula would be more appropriate to minimize vessel trauma, as rapid infusion is not the priority.

How to Approach the Question

• First, identify the core clinical problem in the question: a patient in the emergency department with 'massive blood loss' after an RTA.
• Recognize that 'massive blood loss' necessitates rapid replacement of fluids or blood to treat or prevent hypovolemic shock.
• Recall the principle of IV flow dynamics: a larger cannula bore (smaller gauge number) allows for a faster flow rate.
• Mentally or physically map the cannula colors to their gauge sizes and relative flow rates: Grey (16G, very fast), Green (18G, fast), Pink (20G, medium), Blue (22G, slow).
• Select the option that provides the highest flow rate to meet the patient's urgent need for volume. In this case, the Grey cannula is the best choice among the given options.

Concept Tested & Keywords

• Concept Tested: IV cannula selection for rapid fluid resuscitation in trauma.
• Stem keywords: RTA, emergency department, massive blood loss, large amount of fluid, blood, cannula
• Lead-in keywords: Which color cannula
• Clinical cues: The phrase 'massive blood loss' is the key clinical cue, indicating the need for rapid volume replacement, which dictates the use of a large-bore cannula.

Question ID

Qzj47k0Cm4FZs7GpiaRw3V

Copy ID

Reference Book

E6 Nursing Fundamentals Taylor p. 1092-1094