Blood management Flashcards
exam 1
Blood transfusion are given to:
Increase
1. CaO2 (blood carrying capacity
2. DO2 (delivery of O2)
Maximum allowable blood loss equation:
starting hct
DO2 is
Oxygen delivery
oxygen needs to be delivered to the tissues
DO2 (oxygen delivery) is dependent on
- oxygen content (CaO2) of blood
- blood flow of tissue (CO)
CaO2 is
Oxygen content
Oxygen content (CaO2) =
O2 dissolved in blood + O2 carried or bound by hemoglobin
DO2 =
(equation)
CaO2 x CO
VO2 is
oxygen consumption
DO2 (what is it and equation)
Oxygen delivery
CaO2 x CO
Oxygen content (CaO2) equation:
Oxygen bound to Hgb + oxygen dissolved in blood
(1.34 x Hgb x O2 sat/100) + (0.003 x PO2)
Oxygen bound to hgb calculation
1.34 x Hgb x O2sat/100)
Oxygen dissolved in blood calculation
0.003 x PO2
Normal oxygen consumption (VO2)
250 mL/min or
3.5 mL/kg/min
Mixed venous measurement reflects:
balance of O2 delivery (DO2) and consumption (VO2)
Normal SVO2 (mixed venous saturation)
65-75%
Normal PvO2
35-45 mmHg`