What is the physiologic consequences of CO2 narcosis?

A. Excessive sleepiness in the client with hypercarbia
B. Failure of rising blood levels of CO2 to trigger more rapid and deeper respirations
C. A change in the ventilation-perfusion ratio, in which ventilation exceeds perfusion
D. Increase in the percentage of oxygen delivered to the client does not result in an increased PaO2


B
In the healthy person, a rising PaCO2 level is the drive to breathe and stimulates an increased rate and depth of respiration. When the PaCO2 rises gradually, the central chemoreceptors lose their sensitivity and are no longer the drive to breathe, a condition called CO2 narcosis. Thus, the only trigger to stimulate breathing in clients with CO2 narcosis is hypoxemia, a declining PaO2 level.

Nursing

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