Physiologic Dead Space
This
simple calculator gives an estimation of the physiological dead space,
by comparing the expired CO2 and the arterial CO2.
Difference between arterial and expired CO2 is observed in various lung
diseases, and in all situations where a significant proportion of the
ventilation delivered to the patient is distributed to
"inactive", non perfused areas ("dead
space").
Calculation
Method:
- Step
1: Enter PaCO2 (Arterial Partial Pressure of CO2, obtained from blood gas
machine) and PetCO2 (End Tidal CO2, obtained from capnometry monitoring).
- Step
2: Click "Calculate" button.
Result
is expressed as the VD/VT ratio (ratio of dead space volume to tidal volume).
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Notices and Disclaimer:
All
Information contained in and produced by the ICU CALCULATORs is provided for
educational purposes only. This information should not be used for the
diagnosis or treatment of any health problem or disease. This information is
not intended to replace clinical judgment or guide individual patient care in
any manner.
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