During the first stage of increased intracranial pressure, the brain attempts to compensate by employing a mechanism called:
Rejuvenation
Autoregulation
Percolation
Demarcation
The Correct Answer is B
A. Rejuvenation –. This is not a physiological term used in the context of ICP or brain compensation.
B. Autoregulation –This is the brain’s ability to maintain consistent cerebral blood flow (CBF) despite changes in systemic blood pressure. In early stages of increased ICP, autoregulation helps maintain oxygen and nutrient delivery to brain tissue by adjusting cerebral vessel diameter.
C. Percolation –This term is not relevant in neurophysiology or ICP management.
D. Demarcation –This refers more to distinguishing boundaries between tissues (e.g., in gangrene), not compensatory mechanisms for ICP.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Ischemia and neuronal death – Cerebral perfusion pressure (CPP) is the pressure needed to ensure adequate blood flow to the brain. If CPP drops too low, the brain doesn't receive enough oxygen and glucose, leading to ischemia and eventually neuronal death.
B. Improved cognitive function – Low CPP results in decreased oxygen and nutrient delivery, which impairs cognitive and neurological function.
C. Increased blood flow to the brain – Low CPP means reduced blood flow, not increased.
D. Undetectable intracranial glucose levels – While glucose delivery may decrease, levels are not necessarily undetectable and this is not the primary concern with low CPP.
Correct Answer is A
Explanation
A. Mannitol is an osmotic diuretic used to reduce increased intracranial pressure, which is critical in managing Cushing’s Triad.
B. Heparin is an anticoagulant and would worsen bleeding in a subdural hematoma.
C. Warfarin is also an anticoagulant and contraindicated in bleeding.
D. Acyclovir is an antiviral, not relevant to treating increased ICP from hematoma.
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