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Figure 4 | Critical Care

Figure 4

From: The influence of venous admixture on alveolar dead space and carbon dioxide exchange in acute respiratory distress syndrome: computer modelling

Figure 4

Alveolar dead space fraction versus shunt fraction at varying acid base status. Alveolar dead space fraction (VdAS/VtA) versus shunt fraction (Qs/Qt) at varying acid-base status. Respiratory acidosis I and II refer to arterial carbon dioxide tension (PaCO2) values of 9.1 kPa and 15.8 kPa, respectively, yielding arterial pH (pHa) values of 7.25 and 7.09, respectively. Metabolic acidosis I and II refer to base excess (BE) values of -9.0 mmol/l and -17 mmol/l, yielding pHa values of 7.25 and 7.10, respectively.

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