Medical Definition of cardiac index
: a measure of cardiac output per square meter of body surface area Her cardiac output (as measured by thermodilution) was 6 liters per minute (reference range, 4 to 8), with a cardiac index of 3.3 liters per minute per square meter of body-surface area (reference range, 2.5 to 4.0).— Zoltan P. Arany et al., The New England Journal of Medicine, 17 July 2014
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