Why does PvO2 decrease when Flow decreases?

[Ven0m]

Kaplan says that a fall in PvO2 or SvO2 % indicates that the patients O2 consumption increased and/or there was a fall in Q or CaO2 or both.

I don't get the bolded part. Why would a fall in flow decrease venous blood O2?

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[dfib slim]

Kaplan says that a fall in PvO2 or SvO2 % indicates that the patients O2 consumption increased and/or there was a fall in Q or CaO2 or both.

I don't get the bolded part. Why would a fall in flow decrease venous blood O2?

Less flow = more time for the tissue to extract oxygen

 

[Ven0m]

I

Less flow = more time for the tissue to extract oxygen

It's not because O2 delivery = Q x CaO2, and decreasing O2 delivery (by decreasing flow) decreases PvO2 and SvO2 %?

 

[dfib slim]

I

It's not because O2 delivery = Q x CaO2, and decreasing O2 delivery (by decreasing flow) decreases PvO2 and SvO2 %?

 

[Ven0m]

Thank youu )