What is the consequence of low cerebral perfusion pressure?
Ischemia and neuronal death
Improved cognitive function
Increased blood flow to the brain
undetectable intracranial glucose levels
The Correct Answer is A
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Decerebrate posturing is characterized by extension and rigidity of the arms and legs, typically indicating damage to the midbrain or pons. It reflects severe brain injury.
B. Tonic-clonic seizures involve rhythmic muscle contractions but are not posturing.
C. Involuntary twisting and repetitive movements describe dystonia or chorea, not decerebrate posturing.
D. Uncontrolled jerking movements describe myoclonus or seizures, not decerebrate posturing.
Correct Answer is C
Explanation
A. It enlarges the heart chambers – This is typically seen with volume overload, not pressure overload. Volume overload leads to chamber dilation, not wall thickening.
B. It strengthens heart valves – Afterload does not improve valve function; in fact, high afterload can worsen conditions like aortic stenosis over time.
C. It thickens heart walls – The heart compensates for increased afterload (e.g., from chronic hypertension or aortic stenosis) by hypertrophying (thickening) the ventricular walls. This is called concentric hypertrophy, a structural adaptation to increased pressure.
D. It thins the heart walls – Thinning occurs in conditions like dilated cardiomyopathy where the problem is decreased contractility and volume overload, not increased afterload.
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