Vascular Resistance formula

[beatsbydre]

The formula to vascular resistance is 80*(deltaP)/CO. Where does this 80 come from? Is this supposed to be the HR so that it would be deltaP/(CO/HR)?

Thanks!

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[withrye]

The formula is basically a take on Ohm's law, V=IR (or in this case, R=V/I). Resistance is delP/CO, which gives you units in mmHg*min/L, which aren't the standard units of measurement. The multiplication by 80 is there to convert that number to dyn*sec/cm^5, which is more standard. More rarely you can see multiplication by 8, which converts the number to MPa*s/m^3.

tl;dr It's a unit conversion factor baked in.

 

[beatsbydre]

awesome thanks!