Thursday, May 14, 2015

Advanced Circulatory Support II

Challenge: If the native lungs are not contributing at all, what is the arterial oxygen saturation?

Additional Questions:
1. What is shown here?

Image shown under Fair Use.


RaH said...

I would guess about 75% O2 Sat, this depends on the ratio of oxygenated and de-oxygenated blood in the v.cava / right atrium
this is an artificially created extra-corporal circulation device for oxygenation. looks similar to a heart lung machine, but those inject the oxygenataed blood into the arterial bloodstream.

RaH said...

extracorporeal membrane oxygenation (ECMO) is the correct terminology
And here they discuss values around 99%

Craig Chen said...

yes! nice job. this is definitely ECMO - but the cannula show VV-ECMO rather than VA-ECMO. In VV-ECMO, your sat is 75-85% due to mixing and shunt. In VA ECMO, your sat will be higher.
Advanced Circulatory Support II

This is venovenous extracorporeal membrane oxygenation. Blood is withdrawn from the IVC (from a femoral vein cannula), circulated through an artificial membrane, and returned via the SVC to the RA. When there is no native lung function, arterial saturation is 75-85%.

Source: UpToDate.