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# Anatomic and Alveolar Dead Space * **Anatomic dead space:** gas comes out before alveolar CO2. * **Alveolar dead space:** gas comes out at the same time as CO2 from perfused alveoli. * **Alveolar dead space:** gas dilutes CO2 from perfused alveoli. This is why PaCO2 > ETCO2.
# Anatomic and Alveolar Dead Space * **Anatomic dead space:** gas comes out before alveolar CO2. * **Alveolar dead space:** gas comes out at the same time as CO2 from perfused alveoli. * **Alveolar dead space:** gas dilutes CO2 from perfused alveoli. This is why PaCO2 > ETCO2.
