TYK112

Which of the following changes will lead to an INCREASE in cerebral oxygen saturation (as measured via NIRS)?

a) Increase in cerebral metabolic rate of oxygen (CMRO2)

b) Acute normovolemic hemodilution

c) Increase in end-tidal carbon dioxide

d) Decrease in cerebral blood flow

e) Hyperthermia

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Answer

Answer c.

Cerebral oxygen saturation can be increased by increasing cerebral blood flow, decreasing CMRO2, increasing carbon dioxide (which leads to increased cerebral blood flow), hypothermia (which decreases CMRO2), or improved oxygen content of the arterial blood (increased oxygen saturation or hemoglobin concentration).

Notes

This question originally printed in the Pediatric Anesthesiology Review Topics kindle book series, and appears courtesy of Naerthwyn Press, LLC.

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