NORCET 2 -2021 (Shift…: A Patient with RTA comes into the emergency department that needs resuscitation. Which cannula is least prefe…

NORCET 2 -2021 (Shift-2)

Medical & Surgical Nursing

Medium

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

Explanation

The 22-gauge cannula has the smallest internal diameter among the choices provided.
A smaller diameter results in a significantly lower flow rate (approximately 36 mL/min), which is insufficient for rapid fluid and blood product administration required during resuscitation.
In trauma care, time is critical, and using a small-bore cannula like the 22G would delay volume replacement, potentially leading to worsening shock and poor patient outcomes.
This size is typically reserved for routine, non-emergent infusions or for patients with very small or fragile veins.

Option B: A 20-gauge (pink) cannula has a higher flow rate (approx. 60 mL/min) than a 22G cannula. While not the first choice for massive resuscitation, it is more suitable than the 22G cannula and can be used for routine blood transfusions and fluid administration.
Option C: An 18-gauge (green) cannula is a large-bore catheter with a high flow rate (approx. 90 mL/min). It is a standard and appropriate choice for trauma patients, rapid fluid infusions, and blood transfusions.
Option D: A 16-gauge (grey) cannula has a very large bore and the highest flow rate among the options (approx. 220 mL/min). It is the most preferred cannula for rapid and massive fluid or blood resuscitation in trauma settings.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Selection of appropriate intravenous (IV) cannula size for trauma resuscitation in acute care settings.
In a trauma setting, establishing rapid, large-bore IV access is a critical life-saving intervention. The nurse's ability to quickly select the appropriate cannula (16G or 18G) can directly impact the patient's outcome by enabling swift correction of hypovolemia and prevention of irreversible shock.
The principle 'time is tissue' applies here; delaying effective fluid resuscitation due to an inappropriately small cannula can lead to organ damage from hypoperfusion.
What if? If the patient was a stable 80-year-old with fragile veins needing a routine antibiotic infusion, a 22G cannula would become a preferred choice to minimize the risk of vein trauma and infiltration. The clinical context completely changes the correct answer.

How to Approach the Question

First, identify the core clinical scenario: a patient with RTA needing resuscitation.
Understand the primary goal of resuscitation in this context: rapid intravenous fluid administration to combat shock.
Recall the relationship between IV cannula gauge and flow rate: a smaller gauge number means a larger bore (diameter) and a much higher flow rate.
Analyze the question's specific requirement: identify the 'least preferred' option.
Evaluate the options based on the principle. The least preferred cannula will be the one with the slowest flow rate.
Select the cannula with the highest gauge number (22G) as it has the smallest bore and is therefore the least suitable for rapid resuscitation.

Concept Tested & Keywords

Concept Tested: Selection of appropriate intravenous (IV) cannula size for trauma resuscitation.
Stem keywords: RTA, emergency department, resuscitation, cannula
Lead-in keywords: least preferred
Clinical cues: Patient with RTA needing resuscitation implies a state of shock or significant blood loss, requiring rapid fluid replacement.
Negative lead-in flag: The question asks for the LEAST preferred option, which means three options are more suitable than the correct answer.

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E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 619-621

E6 Nursing Fundamentals Taylor p. 819-821