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Figure 36-14
Monitoring of expired oxygen (O2
) to monitor
lung nitrogen (N2
) washout. If preoxygenation is desired, its progress
can be assessed by monitoring expired O2
. The top panel shows exhaled
O2
concentration on a compressed time scale while breathing 100% O2
through an anesthesia mask. The next panel shows exhaled CO2
on the same
time scale. Exhaled O2
steadily rises, and the difference between the
inhaled and exhaled O2
(I-e on the display) falls.
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