Least used cannula for blood transfusion?

NORCET 2 -2021 (Shift-2)

Medical & Surgical Nursing

Medium

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

Explanation

The Blue cannula corresponds to a 22 gauge size, which is the smallest diameter among the four options.
Its flow rate of approximately 36 mL/min is insufficient for the efficient administration of viscous blood products in adults.
Using a small-bore cannula for blood transfusion significantly increases the risk of mechanical hemolysis, which is the destruction of red blood cells as they are forced through the narrow tube.
It is typically reserved for pediatric patients or adults with very fragile veins for non-blood infusions.

Option A: The Gray (16G) cannula has a very large bore and a high flow rate (approx. 180 mL/min). It is one of the most preferred cannulas for rapid blood transfusions, especially in trauma and surgery.
Option B: The Green (18G) cannula is a standard, widely used, and often preferred choice for routine blood transfusions in adult patients due to its adequate flow rate (approx. 90 mL/min) and large enough bore to prevent hemolysis.
Option C: The Pink (20G) cannula is also a very common and acceptable choice for routine blood transfusions. Its flow rate (approx. 60 mL/min) is sufficient for most non-emergent situations.

Visual 1: Infographic: A color-coded chart of IV cannula sizes, showing gauge, flow rate, and recommended clinical applications for each.
Visual 2: Illustration: A diagram depicting hemolysis, showing how red blood cells can be damaged when forced through a narrow-bore cannula compared to a wide-bore one.

Clinical Relevance

Nursing practice connection: Knowing IV Cannula Selection for Blood Transfusion helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Selecting the appropriate IV cannula is a critical nursing responsibility to ensure patient safety and the effectiveness of a blood transfusion.
Using a cannula that is too small can lead to prolonged transfusion times, clotting of the blood product in the line, and potential transfusion reactions if hemolyzed cells are infused.
What if? If a patient has extremely poor venous access and a 22G (Blue) cannula is the only one that can be inserted, the nurse must communicate this to the prescribing provider. The transfusion may proceed with caution, using an infusion pump for a very slow, controlled rate, and the patient must be monitored closely for signs of hemolysis (e.g., fever, back pain, red urine).

How to Approach the Question

Identify the key terms in the question: 'Least used' and 'blood transfusion'.
Recall the principle of IV cannula sizing: a smaller gauge number means a larger diameter and higher flow rate.
Understand the requirement for blood transfusion: a larger bore cannula is preferred to allow for adequate flow of viscous blood and to prevent damage to red blood cells (hemolysis).
Evaluate the options by their gauge size and suitability: Gray (16G - large), Green (18G - large), Pink (20G - medium), and Blue (22G - small).
Conclude that the smallest cannula (Blue, 22G) is the least suitable and therefore the least used for blood transfusions.

Concept Tested & Keywords

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