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Figure 1 | Critical Care

Figure 1

From: Causes of a high physiological dead space in critically ill patients

Figure 1

Comparison of effects of shunt (top) and ventilation/perfusion ratio ( V ˙ A / Q ˙ MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuqqRPxAKvMB6bYrY9gDLn3AGiuraeXatLxBI9gBaebbnrfifHhDYfgasaacPi6xNi=xH8viVGI8Gi=hEeeu0xXdbba9frFj0xb9qqpG0dXdb9aspeI8k8fiI+fsY=rqGqVepae9pg0db9vqaiVgFr0xfr=xfr=xc9adbaqaaeGaciGaaiaabeqaaeqabiWaaaGcbaGafeOvayLbaiaadaWgaaWcbaGaeeyqaeeabeaakiabc+caViqbbgfarzaacaaaaa@3263@ ) inequality (bottom) on calculated physiological dead space. In general, V ˙ A / Q ˙ MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuqqRPxAKvMB6bYrY9gDLn3AGiuraeXatLxBI9gBaebbnrfifHhDYfgasaacPi6xNi=xH8viVGI8Gi=hEeeu0xXdbba9frFj0xb9qqpG0dXdb9aspeI8k8fiI+fsY=rqGqVepae9pg0db9vqaiVgFr0xfr=xfr=xc9adbaqaaeGaciGaaiaabeqaaeqabiWaaaGcbaGafeOvayLbaiaadaWgaaWcbaGaeeyqaeeabeaakiabc+caViqbbgfarzaacaaaaa@3263@ inequality leads to greater dead space than shunt does. Log SDQ, second moment (dispersion) of the ventilation/perfusion distribution on a log scale.

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