Needle gauge preferred for blood transfusion is-

RUHS, Jaipur, PB B.Sc Nursing Entrance-2024

Nursing Foundation

Easy

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2024

Explanation

The 18 G cannula is preferred for adult blood transfusions because its larger bore (internal diameter) is ideal for viscous fluids like blood.
It allows for a rapid flow rate of approximately 90 mL/min, which is crucial in many clinical situations and helps complete the transfusion within the safe 4-hour window.
Using a larger gauge like 18 G minimizes mechanical damage (hemolysis) to red blood cells as they pass through the catheter.

Option A: This is a very small gauge (20 mL/min) used for neonates and infants. Using it for blood in adults would cause a very slow infusion and a high risk of hemolysis.
Option C: While it can be used for blood transfusions, it is not the preferred gauge. Its flow rate (60 mL/min) is significantly slower than an 18 G, and it carries a slightly higher risk of hemolysis.
Option D: This gauge is too small for routine adult blood transfusions, with a slow flow rate (36 mL/min) and an increased risk of damaging red blood cells.

Clinical Relevance

Nursing practice connection: Knowing IV Cannula Gauge Selection for Blood Transfusion helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Choosing the correct cannula gauge is a critical nursing responsibility to ensure patient safety and the therapeutic effectiveness of a blood transfusion.
Using a gauge that is too small can lead to hemolysis, where red blood cells are destroyed. This not only renders the transfusion ineffective but can also release potassium into the bloodstream (hyperkalemia), which is potentially life-threatening.
What if? If the patient requires a massive and rapid transfusion due to trauma or hemorrhage, the nurse should choose an even larger gauge, such as a 16 G or 14 G, to allow for the fastest possible infusion rates (180-240 mL/min).

How to Approach the Question

First, identify the key terms in the question: 'preferred', 'needle gauge', and 'blood transfusion'.
Recognize that blood is a viscous fluid, meaning it is thicker than water or standard IV solutions.
Recall the principle of fluid dynamics in nursing: a larger bore (which corresponds to a smaller gauge number) is required for viscous fluids to flow adequately and to prevent damage to cellular components.
Evaluate the options provided. The gauge numbers are 24, 18, 20, and 22. Remember that the smaller the number, the larger the needle's diameter.
Compare the options based on this principle. An 18 G needle is larger than 20 G, 22 G, and 24 G.
Conclude that the 18 G cannula is the standard preferred size for adult blood transfusions to ensure a safe and effective procedure.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor pp. 1092-1094, 806-808

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 76-78