Which of the following is a key sign of increased intracranial pressure (ICP) following a head injury

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024

Medical & Surgical Nursing

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024

Explanation

Bradycardia, a slow heart rate, is a key sign of severely increased intracranial pressure (ICP).
It is one of the three components of Cushing's triad, a critical set of late signs indicating pressure on the brainstem.
Cushing's triad consists of: 1) Hypertension with a widening pulse pressure, 2) Bradycardia, and 3) Irregular respirations (bradypnea).
This response, known as the Cushing's reflex, is the body's attempt to maintain cerebral perfusion against the high pressure within the skull.
Its presence signals a neurological emergency requiring immediate intervention to prevent brain herniation.

Option A: While pupil dilation is a crucial sign of increased ICP, it results from direct pressure on the oculomotor nerve (CN III). Bradycardia is part of the specific systemic reflex known as Cushing's triad.
Option C: Increased ICP causes systemic hypertension, not hypotension. The body raises blood pressure to overcome the high pressure in the skull and maintain blood flow to the brain.
Option D: Hyperthermia is not a primary sign of the Cushing's reflex. It is a later complication that can occur if the hypothalamus, the brain's temperature control center, is compressed or damaged.

Clinical Relevance

Nursing practice connection: Knowing Signs and symptoms of increased intracranial pressure (ICP) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Recognizing Cushing's triad is a critical nursing skill, as it signals a neurological emergency requiring immediate medical intervention to prevent irreversible brain damage or death.
Nurses must perform frequent and accurate vital sign monitoring and neurological assessments for any patient at risk for increased ICP, such as those with head trauma, brain tumors, or stroke.
What if? If the patient presented with tachycardia (fast heart rate) instead of bradycardia, the nurse should consider other causes like hypovolemic shock, pain, fever, or anxiety, as this is the opposite of the expected sign in Cushing's triad.

How to Approach the Question

First, identify the core concept of the question, which is identifying a key sign of increased intracranial pressure (ICP) after a head injury.
Recall the classic signs and syndromes associated with severe ICP. The most specific is Cushing's triad.
Mentally list the three components of Cushing's triad: hypertension (with widening pulse pressure), bradycardia, and irregular respirations.
Scan the options to see if any of them match a component of the triad. 'Bradycardia' is a direct match.
Evaluate the other options to confirm they are less accurate. Pupil dilation is a sign but not part of the triad. Hypotension is the opposite of what is expected. Hyperthermia is a non-specific, later sign.
Conclude that bradycardia is the most accurate answer as it is a defining feature of the Cushing's reflex.

Concept Tested & Keywords

Concept Tested: Signs and symptoms of increased intracranial pressure (ICP)
Stem keywords: increased intracranial pressure, ICP, head injury, key sign
Lead-in keywords: Which
Clinical cues: The context of a head injury points towards a neurological complication.