NORCET 2 - 2021 (shif…: Which is a self-retaining tube?

NORCET 2 - 2021 (shift-1)

Medical & Surgical Nursing

Easy

Appeared in: NORCET 2 - 2021 (shift-1)

Explanation

A self-retaining tube is designed to stay in place on its own after insertion.
The Foley catheter is a classic example of a self-retaining tube, also known as a retention or indwelling catheter.
Its defining feature is an inflatable balloon at the tip, which is filled with sterile water after insertion into the bladder.
This inflated balloon rests against the bladder neck, preventing the catheter from being accidentally removed, thus making it 'self-retaining'.

Option A: A red rubber tube is a type of intermittent or straight catheter. It lacks any feature like a balloon or expandable tip to hold it in place.
Option B: Although a Malecot catheter is technically self-retaining due to its winged tip that expands, the Foley catheter is the most common and quintessential example of a self-retaining urinary catheter. In multiple-choice questions with two correct options, the most common or classic example is often the intended answer.
Option C: A nasogastric (NG) tube is not self-retaining. It is inserted through the nose into the stomach and must be secured externally with adhesive tape to the patient's nose and cheek to prevent it from dislodging.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification and classification of medical catheters based on their retention mechanisms as background academic context rather than a clinical decision trigger.
Understanding the difference between self-retaining and non-retaining catheters is crucial for patient safety and appropriate care. Using the wrong type can lead to ineffective treatment or injury.
Self-retaining catheters like the Foley are associated with a high 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 urinary drainage (months to years) and has urethral trauma, a suprapubic catheter (often a Malecot or Foley type inserted surgically above the pubic bone) would be a better choice than a urethral Foley catheter to reduce the risk of urethral injury and infection.

How to Approach the Question

First, understand the key term in the question: 'self-retaining'. This means a device that can hold itself in place inside the body.
Next, evaluate each option based on this definition.
Recall or look up the mechanism of a 'Red rubber tube'. It's a straight catheter with no retention feature. Eliminate this option.
Analyze 'NG tube'. You know this is secured with tape on the outside of the body. Eliminate this option.
Consider 'Malecot catheter' and 'Foley catheter'. Recall their designs. The Malecot has an expandable, winged tip. The Foley has an inflatable balloon. Both are self-retaining mechanisms.
When faced with two technically correct answers, consider the context of a general nursing exam. The Foley catheter is the most common and universally known self-retaining catheter. Therefore, it is the 'best' answer in this context.

Concept Tested & Keywords

Concept Tested: Identification and classification of medical catheters based on their retention mechanisms.
Stem keywords: self-retaining tube, catheter
Lead-in keywords: Which is

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E6 Nursing Fundamentals Taylor p. 598-600

E6 Nursing Brunner Adult Health 3SA Vol 1 Part 2 p. 89-91