Cardiac Index in High Output Failure? - USMLE Forums
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Old 09-02-2012
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Heart Cardiac Index in High Output Failure?

Does anyone know why the cardiac index is normal in High-out failure (UWorld question Id: 4243) ?
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Old 09-03-2012
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Because in cases of high-output failure the heart is in good shape and working its best to compensate for the increased body need. Like in case of fistula, the heart increases its output but despite that, the body is not having enough supply because of the fistula (defect in delivery).
But in case of intrinsic heart problem, the heart itself in not working well and not pumping the amount required (defect in pumping).

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Old 09-03-2012
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Originally Posted by roodiemd View Post
Because in cases of high-output failure the heart is in good shape and working its best to compensate for the increased body need. Like in case of fistula, the heart increases its output but despite that, the body is not having enough supply because of the fistula (defect in delivery).
But in case of intrinsic heart problem, the heart itself in not working well and not pumping the amount required (defect in pumping).

Great explanation. But was wondering are you not pumping more blood out than normal in high-output? Since CI = CO/BSA = (SV*HR)/BSA.
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