06-05-2007, 04:54 PM
2 patients- pt. A has CO poisoning & CO binds 50% of the available O2 binding sites on Hb .
& pt. B has iron def anemia & pt. has 50% of the normal amount of Hb
Why pt A has higher risk of tissue hypoxia?
1 CO causes arterial hypoxemia while anemia does not
2 CO causes decrease in diffusing capacity
3 decrease in P50 of Hb for O2
4 greater decrease in concentration of arterial oxygen
5 reduced rate of O2 binding to available Hb
& pt. B has iron def anemia & pt. has 50% of the normal amount of Hb
Why pt A has higher risk of tissue hypoxia?
1 CO causes arterial hypoxemia while anemia does not
2 CO causes decrease in diffusing capacity
3 decrease in P50 of Hb for O2
4 greater decrease in concentration of arterial oxygen
5 reduced rate of O2 binding to available Hb