Oximeters

Tom Benzoni benzonit at GMAIL.COM
Mon Jan 29 18:40:26 UTC 2018


There is an extensive lit in peds showing the correlation is good; oxygen
dissociation curves effect interpretation, however.

SaO2 gives a range of oxygen content; 99% is physiologically the same as
92% although the total oxygen content is ~30% different.
pH also effects hemoglobin; an acidotic state releases oxygen more easily.
This is a protective mechanism that fails in reverse; acidosis, as you
know, is better tolerated than alkalosis.

I rarely request ABGs; I can get the same data noninvasively without
risking the hand's survival.
Oh, and going to see the patient still works....

tom

On Mon, Jan 29, 2018 at 10:42 AM, Robert Bell <
0000000296e45ec4-dmarc-request at list.improvediagnosis.org> wrote:

> How accurate are oximeters? Are the errors big enough to make wrong
> decisions?
>
> Rob Bell, M. D.
>
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