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submitted by radion(11),

Hypercarbia causes cerebral vasodilation. If you have ever seen an intra- or acute post-op neurosurgical patient, or really any patient about to herniate, you can remember this because they will be hyperventilated to pCO2 around 25-30 to decrease ICP via cerebral vasoconstriction; in this case, we have the opposite. The curve of pCO2 vs cerebral blood flow is quite steep in the physiologic range meaning small changes in ventilation make a significant difference in CBF.

smc213  FA 2018 p.486 +3  
lynn  2019 - pg 489 +2  
jaeyphf  2020 - pg 501 +1  


submitted by pharmtomed(1),

Could anyone help me on why this couldn't be C (facial portion of the homonculus in the primary motor cortex)? It explicitly mentions motor issues with the face - not just speech. I understand why it would be Broca's - that's what I put originally. But the last sentence mentioning motor disruption caused me to change my answer. Thanks.

jaeyphf  I didn't even think about the motor part during the question, but it might be related to the homonculus (FA 2020 pg 502). Motor and sensory areas of the lower face generally fall towards the lower half of the brain. Answers B/C/D would probably show some hand or arm involvement. +1  


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