A 50-year-old man on ICU is being monitored with a pulmonary artery catheter. His mixed venous oxygen saturation (SvO2) is 45% (normal 65-75%). Cardia...

Question

A 50-year-old man on ICU is being monitored with a pulmonary artery catheter. His mixed venous oxygen saturation (SvO2) is 45% (normal 65-75%). Cardiac index is 2.2 L/min/m2, Hb 85 g/L, PaO2 12 kPa, lactate 5.5 mmol/L. What does the low SvO2 primarily indicate?

Accepted Answer

Global oxygen delivery is inadequate relative to tissue oxygen consumption

Answer

The patient has a pulmonary shunt

Answer

The PA catheter is wedged and reading capillary blood

Answer

The patient has carbon monoxide poisoning

Answer

Mechanical ventilation is providing excessive oxygenation

uk-fficm MCQ (SBA): Oxygen Delivery-Consumption Balance

A 50-year-old man on ICU is being monitored with a pulmonary artery catheter. His mixed venous oxygen saturation (SvO2) is 45% (normal 65-75%). Cardiac index is 2.2 L/min/m2, Hb 85 g/L, PaO2 12 kPa, lactate 5.5 mmol/L. What does the low SvO2 primarily indicate?