Carpal Tunnel Syndrome is caused by compression of?

GMCH Chandigarh - 2022

Medical Surgical Nursing

Easy

Appeared in: GMCH Chandigarh - 2022

Explanation

Carpal Tunnel Syndrome (CTS) is caused by the compression of the median nerve as it passes through the carpal tunnel at the wrist.
The median nerve provides motor function to the thenar muscles and sensation to the thumb, index, middle, and the radial half of the ring finger.
Inflammation or swelling within the confined space of the carpal tunnel increases pressure on the nerve, leading to symptoms like pain, numbness, and tingling in its distribution.
Diagnostic maneuvers like Phalen's test and Tinel's sign specifically provoke the compressed median nerve to reproduce these symptoms.

Option A: The radial nerve is not located within the carpal tunnel. Its compression typically occurs higher up in the arm, in the spiral groove of the humerus.
Option C: The ulnar nerve passes through a different tunnel in the wrist (Guyon's canal) and is most commonly compressed at the elbow (cubital tunnel). It does not pass through the carpal tunnel.
Option D: The axillary nerve is located in the shoulder region and innervates the deltoid and teres minor muscles. It is nowhere near the carpal tunnel.

Visual 1: Diagram: Cross-section of the wrist showing the anatomy of the carpal tunnel, with the median nerve, flexor tendons, and transverse carpal ligament clearly labeled.
Visual 2: Illustration: Sensory distribution map of the hand, color-coding the areas supplied by the median, ulnar, and radial nerves to visually differentiate their territories.
Visual 3: Infographic: Depicting the Phalen's and Tinel's maneuvers to demonstrate how these diagnostic tests are performed.

Clinical Relevance

Nursing practice connection: Knowing Pathophysiology of Carpal Tunnel Syndrome helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses are crucial in identifying early signs of CTS and educating patients on conservative management, such as wearing wrist splints (especially at night to maintain a neutral position), activity modification, and ergonomic adjustments to reduce wrist strain.
Post-operatively, after a carpal tunnel release surgery, nurses monitor for signs of infection, manage pain, and instruct the patient on hand exercises to restore strength and function.
What if? If a patient with CTS symptoms also has a history of a thyroid disorder or rheumatoid arthritis, the nurse should recognize these as potential underlying causes that need to be managed to effectively treat the CTS.

How to Approach the Question

First, identify the core concept of the question, which is the specific nerve involved in 'Carpal Tunnel Syndrome'.
This is a direct recall question based on anatomical knowledge.
Mentally visualize the anatomy of the wrist and the structures passing through the carpal tunnel.
Recall that the median nerve is the primary nerve that traverses this tunnel along with the flexor tendons.
Evaluate the other options by recalling their primary locations and functions: Radial nerve (wrist extension, back of hand), Ulnar nerve (little finger side of hand), and Axillary nerve (shoulder).
Conclude that only the median nerve's compression at the wrist aligns with the definition of Carpal Tunnel Syndrome.

Concept Tested & Keywords

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