Fig. 2.
Graphic display and formulas of the main dynamic variables that are derived from the respiratory changes in the arterial pressure and plethysmographic waveform during mechanical ventilation. PImax, maximal perfusion index; PImin, minimal perfusion index; PPmax, maximal pulse pressure; PPmin, minimal pulse pressure; SPmax, maximal arterial systolic pressure; SPmin, minimal arterial systolic pressure; SVmax, maximal stroke volume; SVmean, mean stroke volume; SVmin, minimal stroke volume.