An ED nurse expert explains why.
All that pulse oximetry will tell you "is the oxygen permeability in the hemoglobin cells in the tip of the finger," Cohen tells Long-Term Care Survey Alert. And most geriatric patients have some degree of peripheral vascular disease, she points out. Thus, "if the person is walking and talking and not using accessory muscles to breathe, and the pulse oximetry shows the O2 is really low," the machine isn't giving you a correct reflection of the person's ventilation status.