NBME 20 Answers : Block 4 : #15 = A 45-year-old man is undergoing a surgical ...

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nbme20/Block 4/Question#15 (38.5 difficulty score)
A 45-year-old man is undergoing a surgical ...
Decreasing respiratory rate🔍
tags:

+7
submitted by radion(15),

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smc213 FA 2018 p.486 +3

lynn 2019 - pg 489 +3

jaeyphf 2020 - pg 501 +2

+1
submitted by drdoom(682),

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hello But, the Q-stem states the anesthesiologist is HYPOventilating the patient. +4

drdoom decreasing respiratory rate = retention of CO2 = vasodilation of brain arteries = more filling of tubes = greater intra-cranial pressure +1

drdoom @hello shoot, you're right! i ended my explanation with the example of HYPERventilation when i should have done the opposite! (sorry!) ... edit: "By HYPOventilating (retaining CO2), the brain vasculature senses a high CO2 environment and vasodilates = increases intra-cranial filling and pressure!" +3

dulxy071 @drdoom could you please elaborate on your point. +

+1
submitted by hayayah(996),

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+0
submitted by cienfuegos(55),

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outdl'Cn oyu loas eedserac hte IF?2O Pre F,A PCP alos siceanser to ayxpoih lsao eadrecsse CPP ehwn PO2 tl&; 50 m.mHg

cienfuegos Obviously not the BEST option in this scenario, but seems like it could work unless I'm missing something. +1

step1soon Its primariy driven by PCO2! only when O2 levels drop <50 mmhg is when the body responds to low O2 pressures +1