When a central venous catheter is not in use, how often should the catheter line be flushed to maintain its patency and prevent complications?

1. A

   Every 12 hours

2. B

   Every 24 hours

3. C

   Every 36 hours

4. D

   Every 48 hours

Appeared in: NORCET 7 Prelims -2024

Explanation

Listen in Hindi

• Standard clinical guidelines recommend daily flushing for central venous catheters that are not in continuous use.
• Flushing every 24 hours is sufficient to prevent the formation of blood clots (thrombus) and fibrin buildup inside the catheter lumen.
• This frequency balances maintaining patency with minimizing the risks associated with accessing the line, such as infection.
• Evidence from nursing literature confirms that daily flushing is necessary when a catheter is not in use to ensure it remains functional.

Why Other Options Were Wrong

• Option A: Flushing every 12 hours is more frequent than necessary for a standard, unused CVC. It increases the number of times the closed system is accessed, which can elevate the risk of contamination and infection (CLABSI) without providing a significant benefit in patency.
• Option C: Waiting 36 hours between flushes significantly increases the risk of the catheter becoming occluded with a blood clot. This can render the line unusable, requiring procedures to declot it or replace it entirely.
• Option D: Waiting 48 hours poses an even higher risk of catheter occlusion than waiting 36 hours. The likelihood of thrombus formation is very high, leading to loss of the access site and potential complications.

Related Visual

• Visual 1: Diagram - Illustrating the push-pause flushing technique for a CVC. This would show a hand pushing the syringe plunger in short, alternating motions.
• Visual 2: Infographic - Comparing the pressure exerted by a 3-mL, 5-mL, and 10-mL syringe to explain why a 10-mL syringe is safer for flushing CVCs.
• Visual 3: Flowchart - Steps for aseptic CVC access, including hand hygiene, scrubbing the hub, and attaching the flush syringe.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Maintenance of central venous catheter (CVC) patency as background academic context rather than a clinical decision trigger.
• Maintaining CVC patency is a fundamental nursing responsibility that directly impacts patient safety and treatment efficacy. A clotted line can delay or prevent the administration of critical medications, fluids, or nutrition.
• Failure to follow proper flushing protocols is a leading cause of CVC complications, including occlusion and bloodstream infections (CLABSI), which increase patient morbidity, mortality, and healthcare costs.
• In the Indian healthcare context, where resource constraints can be a factor, preventing line loss through meticulous care is paramount to avoid the costs and risks of repeated insertions.

How to Approach the Question

• Identify the core subject of the question: It's about the maintenance of a central venous catheter (CVC).
• Pinpoint the specific action: The question asks about flushing the catheter.
• Note the condition: The CVC is 'not in use'. This is a key detail that distinguishes it from a line with continuous infusion or intermittent medication.
• Determine the question's goal: It asks for the correct frequency ('how often') to maintain patency.
• Recall standard nursing protocols for IV line maintenance. The standard for an unused CVC is daily flushing.
• Evaluate the options based on this standard. 'Every 24 hours' is the direct equivalent of 'daily'. The other options are either too frequent (increasing infection risk) or too infrequent (increasing clotting risk).

Concept Tested & Keywords

• Concept Tested: Maintenance of central venous catheter (CVC) patency
• Stem keywords: central venous catheter, not in use, flushed, maintain patency
• Lead-in keywords: how often

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QhKfOMEIVPoc14xnbSNgU9

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