In an infant the important clinical finding which makes one to suspect increased intracranial tension is?

OSSSC Nursing Officer-2023

Child Health Nursing (Pediatrics)

Easy

Appeared in: OSSSC Nursing Officer-2023

Explanation

A bulged or tense anterior fontanel is a hallmark sign of increased intracranial pressure (ICP) in infants.
The infant's skull bones are not yet fused, leaving soft spots (fontanels) that can bulge outwards when pressure inside the skull increases due to excess fluid, swelling, or a mass.
This sign is a direct physical manifestation of the pressure difference between the inside of the cranium and the outside environment.
Assessment should be done when the infant is calm and upright, as crying can cause a temporary, normal bulging of the fontanel.

Option A: Fever is a systemic response, most often to infection. While an infection like meningitis can cause increased ICP, fever itself is not a direct sign of the pressure.
Option B: Sunken eyes are a classic sign of dehydration and volume loss. This is the physiological opposite of the conditions (e.g., hydrocephalus, cerebral edema) that cause increased intracranial pressure.
Option C: Tachypnea (rapid breathing) is typically a sign of respiratory distress or metabolic acidosis. In contrast, a late and ominous sign of very high ICP is slow, irregular breathing (bradypnea), which is part of Cushing's triad.

Clinical Relevance

Nursing practice connection: Use the key finding related to Clinical signs of increased intracranial pressure in infants to guide bedside assessment, documentation, and the next nursing action.
Nurses must assess an infant's fontanel during every physical examination, especially if the infant presents with irritability, vomiting, or a rapidly increasing head circumference. A tense, bulging fontanel is a red flag.
A bulging fontanel at rest is considered a medical emergency that requires immediate investigation and potential neurosurgical consultation to prevent brain injury.
What if? If the infant had a sunken fontanel instead of a bulging one, the primary clinical concern would shift from increased ICP to dehydration. The immediate nursing intervention would be focused on rehydration, not on measures to decrease intracranial pressure.

How to Approach the Question

First, identify the key elements of the question: the patient is an 'infant' and the condition is 'increased intracranial tension'.
Recall the unique anatomy of an infant's skull, specifically the presence of unfused sutures and fontanels (soft spots). This is the most important physiological difference from an adult.
Think logically: What would happen to a soft, flexible part of a container if the pressure inside increases? It would bulge outwards.
Evaluate each option in this context. Fever, sunken eyes, and tachypnea are signs of other conditions (infection, dehydration, respiratory distress) and are not direct mechanical results of pressure building in the skull.
Conclude that the bulging of the anterior fontanel is the most direct and specific clinical sign of increased intracranial pressure in an infant.

Concept Tested & Keywords

Concept Tested: Clinical signs of increased intracranial pressure in infants.
Stem keywords: infant, clinical finding, increased intracranial tension
Lead-in keywords: important
Clinical cues: Patient is an infant, which is critical because their skull anatomy (unfused fontanels) is different from older children and adults.

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E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1357-1359

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 589-591