SvO2

• related: Cardiology, Pulmonology
• tags: #note

• mixed venous O2 saturation
• measures end O2 consumption and delivery
• must be obtained from pulmonary artery catheter or another central line device
• ScvO2 (central venous O2) useful surrogate and measured via CVC in SVC, measures venous blood from upper half of body
• normal 65-70%
• If low:
  • increased demand: hyperthemia, shiver, pain, seizure
  • decreased delivery: anemia, bleeding, dilution
  • cardiogenic shock
• if high (>0.8): high flow states, sepsis, hyperthyroidism, severe liver disease

• calculate cardiac output from SVO2 from Fick's equation
• CO > 4 or 5 is good
• CI > 2 is good
• Then, calculate SVR from CO
• SVO2 must be obtained from central access
• Renal perfusion pressure = MAP - CVP, must be > 60