The rationale for using normal saline to start blood transfusion is?

SCTIMST Staff Nurse - 2015 (Set-A)

Medical Surgical Nursing

Medium

Appeared in: SCTIMST Staff Nurse - 2015 (Set-A)

Explanation

Normal saline (0.9% NaCl) is an isotonic solution, meaning its solute concentration is similar to that of blood plasma.
This isotonicity ensures there is no significant fluid shift into or out of the red blood cells, thus preserving their integrity and function.
Because it does not damage the blood cells, it is considered 'compatible' with blood, making it the standard choice for priming tubing and administering with blood products.

Option A: This is a true statement but it is too general. It does not explain the specific physiological reason why normal saline is the required choice for blood transfusions.
Option C: This is a correct outcome, but not the root cause. Preventing hemolysis is a direct result of normal saline being isotonic and compatible with blood. The compatibility is the primary rationale.
Option D: This statement explains why a different fluid (dextrose) is contraindicated, not why normal saline is indicated. Dextrose solutions are hypotonic and cause hemolysis and clumping of red cells.

Clinical Relevance

Nursing practice connection: Knowing IV fluid compatibility for blood transfusion helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Patient safety is paramount. Using any fluid other than 0.9% normal saline with blood products can lead to a severe hemolytic transfusion reaction, which is a medical emergency causing fever, chills, kidney damage, and potentially death.
Nursing practice requires priming the entire blood administration set, including the filter, with normal saline before spiking the blood bag to ensure no other solution comes into contact with the blood.
Never 'piggyback' medications or other IV solutions into the same line being used for a blood transfusion. The blood line must be exclusive to saline and the blood product.

How to Approach the Question

First, identify the core of the question: it asks for the 'rationale' or the fundamental reason for a specific nursing action (using normal saline for blood transfusion).
Analyze each option based on physiological principles. Think about what happens to blood cells when exposed to different types of fluids.
Evaluate the correctness and specificity of each option. Option A is true but too general. Option D explains a contraindication for another fluid, not the indication for saline.
Compare the two most plausible options, B and C. 'Prevents haemolysis' (C) is a correct and important outcome. 'It is compatible with blood' (B) is a broader statement that encompasses the prevention of hemolysis as its key component.
Recognize that 'compatibility' in this context is defined by the fluid's isotonicity, which prevents cell damage (hemolysis and crenation). Therefore, compatibility is the most accurate and encompassing rationale.
Select the option that represents the most fundamental principle, which is the overall compatibility derived from its isotonic nature.

Concept Tested & Keywords

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E6 Pharmacology Nursing Lilley 11e Part 2 p. 161-163

E6 Gynecology Williams p. 50-74