Saline water cannot be used to inflate the catheter balloon because?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2015

Nursing Foundation

Hard

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2015

Explanation

Saline solution contains sodium chloride, which can crystallize over the time the catheter is in place.
The water in the saline diffuses through the balloon membrane, leaving behind salt crystals.
These crystals can block the inflation lumen or valve mechanism.
This obstruction prevents the fluid from being withdrawn, resulting in incomplete or failed deflation of the balloon.
Attempting to remove a catheter with a partially inflated balloon can cause significant pain and trauma to the urethra.

Option B: This is the opposite of what occurs. Crystallization prevents the balloon from deflating; it does not cause it to deflate.
Option C: This statement is about a different property of the fluid and is not the primary reason saline is contraindicated. The main issue is mechanical failure due to crystallization, not skin irritation.
Option D: The fluid used to inflate the balloon does not affect the rate or quality of urine drainage. The balloon's function is solely to anchor the catheter within the bladder.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Foley Catheter Balloon Inflation Fluid as background academic context rather than a clinical decision trigger.
Always use sterile water to inflate a Foley catheter balloon as per manufacturer instructions and standard nursing protocol. This is a critical patient safety measure.
Failure to use the correct fluid can lead to a retained catheter, which may require urological intervention for removal and can cause significant urethral trauma, pain, and potential for infection.
If a catheter balloon fails to deflate, do not cut the inflation port. First, re-attempt aspiration. If that fails, notify the provider. Cutting the port can cause the valve to retract into the catheter body, making removal even more difficult.

How to Approach the Question

First, read the question to understand the core concept: why saline is not used for catheter balloon inflation.
Recall the standard procedure for Foley catheterization. The recommended fluid for balloon inflation is sterile water.
Analyze the properties of saline (sodium chloride in water). Consider what might happen to this solution over time inside a semi-permeable balloon.
Evaluate the options based on this scientific principle. Saline contains salt, which can precipitate or crystallize if the water component diffuses out.
Option A correctly identifies that crystallization leads to incomplete deflation.
Options B, C, and D describe incorrect consequences or irrelevant factors. Crystallization prevents, not causes, deflation. Skin irritation and drainage are not the primary issues related to the choice of inflation fluid.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor p. 602-604

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