Tuesday, March 11, 2014

Oxygen saturation mnemonic

I imagine Hemoglobin as a seat for oxygen to sit on. The RBC is like a bus and wohhoo travels the oxygen to it's destination!

Anyway..
If something doesn't allow oxygen to sit on it seat decreases O2 saturation.
Sit - seat - sat, get it?

Carbon monoxide sat on oxygen's seat. O2 saturation decreases in CO poisoning.

Another example, methemoglobinemia.
O2 can not sit on Hemoglobin because heme group is in the Fe3+ or ferric state and that decreases O2 saturation as well!

In anemia, O2 saturation is normal! Why? Nobody is sitting on Oxygen's seat!

Hope this silly thing helps you get through exams ^__^

-IkaN

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