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Body posture, as a gravitational factor, has a clear impact on pulmonary ventilation and perfusion. In lung units with mismatched ventilation and perfusion, gas exchange and/or elimination of carbon dioxide can be impaired. In this situation, differences in the value of arterial and end-tidal carbon dioxide tension [Δ(PaCO(2) - P(ET)CO(2))] are expected to increase. This study was conducted to observe how Δ(PaCO(2) - P(ET)CO(2)) changed according to the 3 different surgical positions, and to determine whether Δ(PaCO(2) - P(ET)CO(2)) is a reliable predictor of ventilation/perfusion mismatch when a patient is in different postural positions.

korean journal of anesthesiology

Difference in the value of arterial and end-tidal carbon dioxide tension according to different surgical positions: Does it reliably reflect ventilation-perfusion mismatch?