Which one of the following is NOT a common cause of increased intracranial pressure? & x20; - RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

Medical & Surgical Nursing

Medium

Appeared in: RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

Explanation

Migraine is a primary headache disorder, characterized by a complex series of neurological events, but it does not involve a sustained increase in the volume of brain tissue, blood, or CSF within the skull.
While severe migraines can cause debilitating pain and symptoms like nausea and vomiting that mimic signs of increased ICP, the underlying pathophysiology is different and does not lead to a dangerous rise in intracranial pressure.
The other options—viral encephalitis, brain tumor, and subarachnoid hemorrhage—are all conditions that directly increase the volume of contents within the rigid skull, leading to increased ICP.

Option B: This is incorrect because viral encephalitis is a direct cause of increased ICP. The infection leads to inflammation and swelling (cerebral edema) of the brain tissue, increasing its volume within the fixed cranial space.
Option C: This is incorrect because a brain tumor is a classic example of a space-occupying lesion. Its growth adds mass and volume inside the skull, directly increasing pressure and potentially obstructing CSF flow.
Option D: This is incorrect because a subarachnoid hemorrhage increases intracranial volume in two ways: by adding the volume of the blood itself and by often impairing the reabsorption of cerebrospinal fluid (CSF), leading to hydrocephalus.

Visual 1: Diagram: Illustration of the Monro-Kellie doctrine, showing the fixed volume of the skull containing brain, blood, and CSF, and how an increase in one component necessitates a decrease in another to maintain normal pressure.
Visual 2: Image: Comparison of CT scans showing a normal brain versus brains with cerebral edema, a tumor, and a subarachnoid hemorrhage to visually differentiate the causes of increased ICP.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Causes of Increased Intracranial Pressure (ICP) as background academic context rather than a clinical decision trigger.
A key nursing responsibility is to differentiate between symptoms of a benign condition like a typical migraine and a life-threatening one like increased ICP. A new, severe, or changing headache pattern always warrants further investigation.
Early recognition of the signs of increased ICP (e.g., altered level of consciousness, pupillary changes, Cushing's triad) is critical for timely intervention to prevent irreversible brain damage or herniation.
What if? If a patient with a known history of migraines presents with 'the worst headache of their life,' accompanied by a stiff neck and photophobia, the nurse must suspect a subarachnoid hemorrhage, not just a severe migraine, and initiate emergency protocols immediately.

How to Approach the Question

First, identify the negative framing of the question with the keyword 'NOT'. This means you are looking for the option that is the exception, the one that does not cause increased ICP.
Recall the Monro-Kellie doctrine, which states that the skull is a rigid box containing three components: brain tissue, blood, and cerebrospinal fluid (CSF). An increase in any one of these without a corresponding decrease in another will raise intracranial pressure (ICP).
Evaluate each option based on this principle:
Viral encephalitis: Causes brain tissue to swell (edema), increasing its volume. This increases ICP.
Brain tumor: Is a mass that adds volume to the intracranial space. This increases ICP.
Subarachnoid hemorrhage: Adds the volume of blood to the intracranial space and can block CSF drainage. This increases ICP.

Concept Tested & Keywords

Concept Tested: Causes of Increased Intracranial Pressure (ICP)
Stem keywords: increased intracranial pressure, common cause
Lead-in keywords: NOT
Negative lead-in flag: This question uses negative framing ('NOT'), requiring you to identify the option that is the exception.

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