Thank you for the elaborated but very much needed explanation.
I think from the modulated Fick's principle (which took a lot of time accepting the new version ) low cardiac output will decrease the Venous oxygen content.
I read further about the subject and what I got to in conclusion is that in hypovolemic shock, cardiac output will decrease, and become unable to keep up with the rate of oxygen uptake by the tissue, which further increase the "oxygen consumption/cariac output" figure, increaseing venous oxygen content. While in septic shock oxygen cosumption (tissue extraction) is impaired, and cardiac output is initially high, making the venous oxygen content high, much like the Artervenous shunts you have talked about.. that's why I saw it frequently in questions about septic shock.
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