NORCET 2 - 2021 (shift-1)
Medical & Surgical Nursing
Medium
Which is a self-retaining tube?
Appeared in: NORCET 2 - 2021 (shift-1)
Explanation
- A self-retaining tube is designed to stay in a body cavity without external support.
- The Foley catheter, also known as a retention catheter, has an inflatable balloon at its tip.
- After insertion into the bladder, the balloon is inflated with sterile water, which anchors the catheter, preventing it from slipping out.
- This mechanism makes it the most common and classic example of a self-retaining urinary catheter used for continuous drainage.
Why Other Options Were Wrong
- Option A: A Red rubber tube is a type of intermittent or straight catheter. It has no mechanism to hold itself in place and is used for temporary drainage, after which it is immediately removed.
- Option B: Although a Malecot catheter is also a self-retaining tube (using expandable wings), the Foley catheter is the most common and archetypal example of a retention catheter in nursing. In a 'best-choice' question format, the Foley is the intended answer.
- Option C: An NG (Nasogastric) tube is inserted through the nose into the stomach for feeding or gastric decompression. It is not self-retaining and must be secured with tape to the patient's face.
Related Visual
- Visual 1: Diagram - A side-by-side comparison of catheter tips. This should clearly show the uninflated and inflated balloon of a Foley catheter, the winged tip of a Malecot catheter, and the simple opening of a Red rubber (straight) catheter. The caption should state: 'Comparison of Catheter Retention Mechanisms.'
- Visual 2: Illustration - An anatomical drawing showing a Foley catheter correctly positioned in a female bladder, with the balloon inflated, anchoring it at the bladder neck. The caption should state: 'Proper placement and function of a Foley self-retaining catheter.'
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification and function of different types of medical catheters and tubes as background academic context rather than a clinical decision trigger.
- Understanding the difference between retaining and non-retaining catheters is crucial for patient safety and preventing complications. Using a non-retaining catheter for a situation requiring continuous drainage would be ineffective and could lead to bladder distention.
- The primary indication for an indwelling catheter like a Foley is urinary retention, but it also increases the risk of Catheter-Associated Urinary Tract Infections (CAUTIs). Nurses must follow strict aseptic technique during insertion and provide meticulous catheter care.
- What if? If a patient requires long-term suprapubic drainage, a Malecot or a Foley-type catheter might be surgically inserted. The choice depends on the surgeon's preference and the specific clinical need, but both serve the purpose of being self-retaining within the bladder.
How to Approach the Question
- First, identify the key term in the question: 'self-retaining tube'.
- Define this term: a tube that can hold itself in place inside the body without external support.
- Evaluate each option against this definition.
- Option A (Red rubber tube) is a straight catheter, so it's not self-retaining. Eliminate it.
- Option C (NG tube) is for the stomach and needs tape. Eliminate it.
- You are left with Option B (Malecot) and Option D (Foley). Both are technically self-retaining.
Concept Tested & Keywords
- Concept Tested: Identification and function of different types of medical catheters and tubes.
- Stem keywords: self-retaining tube
- Lead-in keywords: Which is
Question ID
Qb05l0CfdbmZ_hrC5Iudjl
Practise the full NORCET 2 - 2021 (shift-1)
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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