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0.27 kPa

The critical mitochondrial PO2 in kPa - i.e. the lowest possible partial pressure of oxygen before mitochondria stop working

SaO2

The percentage saturation of arterial blood with oxygen

SvO2

The percentage saturation of venous blood with oxygen

HbO2 = SaO2 x Hb x 1.34

The equation for calculating the HbO2 of arterial blood - the amount of oxygen carried on the haemoglobin of arterial blood

Dissolved O2 = PaO2 from curve x 0.003

The equation for calculating the amount of dissolved O2 in arterial blood

CaO2 = HbO2 + Dissolved O2

The equation for calculating CaO2 = the total amount of oxygen carried in arterial blood

DO2 = CaO2 x CO x 10

The equation for calculating DO2 - oxygen delivery to the body

HbO2 = SvO2 x Hb x 1.34

The equation for calculating the HbO2 of venous blood - the amount of oxygen carried on the haemoglobin of venous blood

Dissolved O2 = PvO2 from curve x 0.003

The equation for calculating the amount of dissolved O2 in venous blood

CvO2 = HbO2 + Dissolved O2

The equation for calculating CvO2 = the total amount of oxygen carried in venous blood

OER = (CaO2 - CvO2) / CaO2

The equation for calculating the oxygen extraction ratio

Hypoxic hypoxia

A type of hypoxia where the PO2 of arterial blood is reduced

Anaemic hypoxia

A type of hypoxia where the PaO2 is normal but [Hb] is reduced

Stagnant or ischaemic hypoxia

A type of hypoxia where the PaO2 and [Hb] are normal but blood flow is low

Histotoxic or cellular hypoxia

A type of hypoxia where tissue DO2 (oxygen delivery) is normal but cells cannot use O2 due to a toxic factor