A nurse is caring for a client who has sustained a neurologic injury with increased intracranial pressure and decreased cerebral perfusion.
Which of the following will maintain cerebral perfusion pressure constant?
Regulation of the amount of carbon dioxide exhaled
Regulation of catecholamines circulating throughout the body
Regulation of how much blood is pumped from the heart
Regulation of constriction and dilation of blood vessels in the brain
The Correct Answer is D
Choice A rationale
Regulation of the amount of carbon dioxide exhaled can affect cerebral blood flow, but it does not directly maintain cerebral perfusion pressure constant.
Choice B rationale
Catecholamines circulating throughout the body can affect blood pressure and heart rate, but they do not directly maintain cerebral perfusion pressure constant.
Choice C rationale
How much blood is pumped from the heart, also known as cardiac output, can affect cerebral perfusion pressure. However, it does not directly maintain cerebral perfusion pressure constant.
Choice D rationale
Regulation of constriction and dilation of blood vessels in the brain, also known as cerebral autoregulation, is a key mechanism that maintains cerebral perfusion pressure constant. When pressure autoregulation is impaired, cerebral blood flow becomes dependent on cerebral perfusion pressure.
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Related Questions
Correct Answer is D
Explanation
Choice A rationale
This statement is incorrect. Nerves do not “go to sleep.”. Peripheral neuropathy in diabetes is caused by damage to the nerves as a result of high blood sugar levels over time.
Choice B rationale
This statement is incorrect. While nerve damage can occur due to various reasons, in the context of diabetes, it is primarily due to prolonged high blood sugar levels.
Choice C rationale
This statement is incorrect. Age and blood flow to the feet are not the primary causes of peripheral neuropathy in diabetes. The primary cause is prolonged high blood sugar levels.
Choice D rationale
This statement is correct. Prolonged high blood sugar levels in diabetes can cause damage to the peripheral nerves, leading to peripheral neuropathy.
Correct Answer is ["B","C","D"]
Explanation
Choice A rationale
Hyponatremia, or low sodium levels, is not typically a symptom of degenerative disc disease. It can be caused by a variety of conditions, but it is not directly linked to degenerative disc disease.
Choice B rationale
Paresthesia, or abnormal sensations such as tingling or prickling, can develop with degenerative disc disease. This is due to the fact that degenerative changes can lead to nerve compression, which can cause these sensations.
Choice C rationale
Foot drop, a gait abnormality, can be a symptom of degenerative disc disease. It can occur if the disease process affects the nerves that control the muscles involved in lifting the foot.
Choice D rationale
Intermittent pain is a common symptom of degenerative disc disease. The pain can vary in intensity and may be worse with certain activities or positions.
Choice E rationale
Hyperreflexia, or overactive reflexes, is not typically a symptom of degenerative disc disease. It is more commonly associated with conditions that affect the upper motor neurons.
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