Table 1.

Classification of shock

	Type of shock
Parameter(s)	Hypovolemic	Cardiogenic	Obstructive	Distributive
Preload, filling pressures, end-diastolic volumes	↓	↑	↕	↓
Pump, cardiac output	↓	↓	↓	↑
Afterload, systemic vascular resistance	↑	↑	↑	↓
Systemic oxygen delivery	↓	↓	↓	↑
Systemic oxygen consumption	↑	↓	↕	↕
Systemic oxygen extraction ratio	↑	↑	↑	↓
Global oxygen balance, SvO2 or ScvO2	↓	↓	↓	↑

SvO₂, mixed venous oxygen saturation; ScvO₂, central venous oxygen saturation.