[RNPQT]

Here's a calculation Q:

When you're figuring out your CO/CI for your hemodynamic parameters, what does the "80" stand for? And if it's a formulation, why is it always 80 that works?

[nurselizk]

Are you thinking of the formula for SVR? The CO is measured directly and the CI is calculated from CO and BSA. The 80 in the SVR formula is simply a conversion factor to get the answer in the proper units.

[RNPQT]

Yeah, that's the formula I was talking about...SVR. But the 80 comes from something; it's not just a random number that always works...

[nurselizk]

It's not random, it's a conversion factor. The formula requires you to use units of mm Hg for MAP and CVP, and L/min for CO, and gives you SVR in units of dyne-sec/cm5. Specifically, 60 sec/min x 1 L/1000 cm3 x 1333.224 dyne/cm2/mm Hg = 80.