Comparison of Arterial-End-Tidal PCO2 Difference and Dead Space/Tidal Volume Ratio in Respiratory Failure

End-tidal CO2 monitors are used to estimate arterial CO2 pressure (PaCO2), but appropriate use of this noninvasive method of assessing blood gases is unclear. In patients with lung disease, the end-tidal CO2 pressure (PETCO2) can differ from PaCO2 because of ventilation-perfusion ( V˙A/ Q˙) mismatch...

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