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.
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Related Questions
Correct Answer is B
Explanation
A. While the brainstem does influence cardiovascular function, brainstem compression affects multiple critical systems, not just cardiovascular.
B. The medulla oblongata in the brainstem contains the respiratory control centers. Compression can disrupt respiratory drive, leading to respiratory arrest, making this the correct answer.
C. The gastrointestinal system is not primarily affected by brainstem compression.
D. This is false, as brainstem compression severely affects respiratory function due to involvement of respiratory centers.
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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