The patient has a cardiac output of 5 L/min and is on 4
L/min of VA ECMO support. Eighty percent of the patient’s cardiac output is
therefore oxygenated by the artificial oxygenator and is 100% saturated. The
patient has essentially no lung function. His SvO2 is 65% with a PO2
of 35 mm Hg. Twenty percent of the patient’s cardiac output goes through the
nonfunctional native lungs where no oxygen is added.
What is the patient’s SaO2 when blood from the ECMO
supported cardiac output and the native cardiac output mix?