Which statement describes a brain herniation?
A type of stroke that occurs when a blood clot blocks blood flow to the brain.
The bones of the skull fuse together, putting pressure on the brain.
A condition in which the brain swells and becomes enlarged.
Pressure inside the skull pushes the brain stem through the foramen magnum.
The Correct Answer is D
A. A type of stroke that occurs when a blood clot blocks blood flow to the brain: This describes an ischemic stroke, not brain herniation. Brain herniation is related to increased intracranial pressure causing displacement of brain tissue, rather than a vascular obstruction.
B. The bones of the skull fuse together, putting pressure on the brain: Premature fusion of skull bones is called craniosynostosis. While it can affect brain growth and intracranial pressure over time, it is not synonymous with brain herniation, which involves acute tissue displacement.
C. A condition in which the brain swells and becomes enlarged: Brain swelling, or cerebral edema, can precede herniation, but edema alone does not define herniation. Herniation specifically refers to the displacement of brain tissue due to elevated intracranial pressure.
D. Pressure inside the skull pushes the brain stem through the foramen magnum: Brain herniation occurs when increased intracranial pressure forces parts of the brain, such as the brain stem or cerebellar tonsils, downward through openings like the foramen magnum. This is a life-threatening event because it compresses vital centers controlling respiration and cardiac function.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. High education level:Higher education is generally considered protective against dementia because it contributes to cognitive reserve. Individuals with more education tend to have better-developed neural networks that can compensate for neurodegenerative changes.
B. Social isolation:Social isolation is a recognized socioeconomic risk factor for dementia. Limited social engagement can reduce cognitive stimulation, increase stress, and contribute to depression, all of which are associated with accelerated cognitive decline and higher dementia incidence.
C. Urban living:Urban versus rural living does not have a direct, consistent link to dementia incidence. While environmental factors in urban areas may influence health, social and cognitive factors are more strongly associated with dementia risk.
D. Increased income:Higher income is often associated with better access to healthcare, nutrition, and education, which can reduce dementia risk. Lower socioeconomic status, rather than increased income, is linked with higher incidence of cognitive decline.
Correct Answer is A
Explanation
A. Loss of water:Hypernatremia commonly results from water loss that exceeds sodium loss, leading to elevated serum sodium concentration. Causes include excessive sweating, diarrhea, fever, or inadequate water intake. The resulting fluid deficit concentrates sodium in the extracellular fluid, producing hypernatremia.
B. Decreased aldosterone:Reduced aldosterone decreases sodium reabsorption in the kidneys, leading to sodium loss rather than accumulation. This condition can contribute to hyponatremia, not hypernatremia, because less sodium is retained in the body.
C. Too much antidiuretic hormone:Excess ADH promotes water reabsorption in the kidneys, diluting serum sodium and leading to hyponatremia. Elevated ADH causes water retention rather than sodium elevation, making hypernatremia unlikely in this scenario.
D. Increased thirst:Increased thirst encourages water intake, which dilutes serum sodium and reduces the risk of hypernatremia. Without an underlying water deficit, enhanced thirst alone does not cause elevated sodium levels.
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