When examining a patient who is paralyzed below the T4 level, the medical-surgical nurse expects to find?

JODHPUR AIIMS SNO-2018

Medical & Surgical Nursing

Medium

Appeared in: JODHPUR AIIMS SNO-2018

Explanation

A spinal cord injury at the T4 level spares the nerve roots that control the upper extremities (brachial plexus, C5-T1) and the diaphragm (phrenic nerve, C3-C5).
This allows for full, independent use of the arms, hands, and shoulders for activities of daily living and self-care.
While the cough's force is reduced due to paralysis of lower intercostal and abdominal muscles, the patient can still generate a functional cough, which is considered relatively 'efficient' for clearing the upper airway compared to patients with higher-level injuries.

Option A: Diaphragmatic function is controlled by the phrenic nerve (C3-C5), which is located well above a T4 injury. Therefore, breathing is not impaired.
Option B: The nerves for the upper extremities (brachial plexus, C5-T1) are above the T4 injury level. Function is preserved, not lost or flaccid.
Option D: Spasticity of the upper extremities indicates an upper motor neuron lesion above the C5-T1 nerve roots, i.e., a cervical spine injury.

Clinical Relevance

Nursing practice connection: Use the key finding related to Functional outcomes after spinal cord injury at the T4 level to guide bedside assessment, documentation, and the next nursing action.
Nurses must accurately assess the level of spinal cord injury to anticipate complications, plan care, and set realistic goals for rehabilitation. A T4 injury patient has high potential for independence in self-care.
Key nursing priorities for a T4 SCI patient include preventing pressure ulcers on the lower body, managing bowel and bladder function, and teaching mobility skills using the upper body.
What if the injury was at C4 instead of T4? The patient would be quadriplegic and dependent on a ventilator for breathing, as the phrenic nerve would be compromised. All four extremities would be paralyzed.

How to Approach the Question

First, identify the key information in the stem: the level of injury is 'below T4'.
Recall the anatomy of spinal cord innervation. Visualize a map of the spinal nerves (dermatomes/myotomes).
Determine which major functions are controlled by nerves originating above T4. These functions will be preserved.
The key nerve groups to consider are: phrenic nerve (C3-C5 for diaphragm/breathing) and brachial plexus (C5-T1 for arms/hands).
Evaluate each option against this anatomical knowledge. An injury at T4 spares the nerves to the diaphragm and arms.
Select the option that describes preserved function of the upper body and rules out options that describe impairment above the T4 level.

Concept Tested & Keywords

Concept Tested: Functional outcomes after spinal cord injury at the T4 level.
Stem keywords: paralyzed, T4 level, spinal cord injury
Lead-in keywords: expects to find
Clinical cues: Paralysis below T4 indicates the level of the lesion and what functions should be spared above it.
Negative lead-in flag: false

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