Pulse oximetry and cyanotic CHD

[rnsusan]

Does anyone know if there have been studies regarding the accuracy of pulse oximetry in the polycythemic cyanotic CHD patient?

I had a patient in which the pulse ox readings varied from high 50s to low 70s in just a few minutes without clinical changes. The waveform looked good the entire time. I got to the point that I did not know when to believe the machine. I changed out probes, machines, and what extremity was used. Nothing seemed to make a difference.

rnsusan

[NotReady4PrimeTime, RN]

I'm pretty sure I read one somewhere. I'll have a look and see whether I can find it... Watch this space.