Physiology

Question 1

Mixed SvO2

Answer 1

75%
Pulmonary artery
Fick equiation: SvO2 = SaO2 - (Vo2/ (COxHbx1.36)

Decreased : increased 02 consumption
Decreased CO ( infarction hypovolemia)
Decreased Hb
Decreased arterial 02 saturation

Increased : increased Hb transfusion
Increased SaO2
Decreased VO2 cyanide sepsis Co poisoning methahb hypothermia
Increased CO sepsis
Left to right shunt

Svo2 directly related to Hb Sao2 Co
Inversely to Vo2

Question 2

Oxygen content

Answer 2

1. 34X Hb x SaO2 +(0.023xPaO2)
2. 34 volume of oxigen bound to 1 g of hemoglobin
3. 023 solubility coefficient of oxigen in plasma