In most "indexed" values the original number is divided by BSA. Is this different for SVR and/or PVR due to the use of a cardiac index instead of the cardiac output as the denominator in the relevant equation?
Dear colleague,
The principle of indexed SVR and PVR calculation are exactly the same: Pulse pressure divided by cardiac index.
Kind regards.
FL
A simple way of understanding this question: Consider a infant whose Qp is P l/min and BSA 0.25m2. If we want to increase his size to a adult with BSA of 1m2, his Lung will increase in size as well as pulmonary vasculature. Resulting into 4 times increase in Qp for given pressure difference. The thing that changes with BSA is Lung tissue and vasculature not pressure difference across Pulmoanry vasculature.Hence while calculating indexed PVR Indexed cardiac output ( cardiac index) is considered.
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