Hemodynamic Oxygenation Parameters and SvO2 Changes

Question 1

Parameter

Answer 1

NL, Clinical Relevance

Question 2

Mixed venous oxygen saturation (SvO2)

Answer 2

60-75%
Most sensitive indicator of cellular oxygenation

Question 3

Central venous oxygen saturation (ScvO2)

Answer 3

> 70%
Used to monitor therapy for septic shock

Question 4

Oxygen delivery (DO2)

Answer 4

900-1,100 mL/min
Pump problems (heart) will decrease DO2

Question 5

Oxygen consumption (VO2)

Answer 5

250-350 mL/min
Low with septic shock

Question 6

Oxygen extraction

Answer 6

~50% of O2 delivery
Myocardial oxygen extraction is > than that of any other muscle
Increases with a drop in CO

Question 7

Increased SvO2

Answer 7

Septic Shock, Hypothermia, Paralysis

Question 8

Decreased SvO2

Answer 8

Low cardiac output
Decreased PaO2 (increased O2 demand: fever, shivering, seizures, increased WOB)
Assess for: hypoxemia, increased WOB, hypotension, hypovolemia, hemoglobin (drop), temperature (fever), arrhythmias