Figure 1.

Simplified algorithm for the choice of hemodynamic monitoring in patients with acute circulatory failure. AP, arterial pressure; ARDS, acute respiratory distress syndrome; CVP, central venous pressure; PaCO₂, carbon dioxide pressure in the arterial blood; PaO₂, oxygen pressure in the arterial blood; PcvCO₂, carbon dioxide pressure in the central venous blood; PPV, pulse pressure variation; RV, right ventricular; SaO₂, arterial blood oxygen saturation; ScvO₂, central venous blood oxygen saturation. Modified from (10) (with permission).