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"hack" equation - trinity

Posted: Mar 20, 2014

On a cardiac cath

Aortic valve area using s/l "Hack" equation.

TIA

HACK EQUATION - Jasmine 215

[ In Reply To ..]
Hi Trinity,

I found this on Wikipedia:

Hack's law is an empirical relationship between the length of streams and the area of their basins. If L is the length of the longest stream in a basin, and A is the area of the basin, then Hack's law may be written as

L = C A^h
for some constant C where the exponent h is slightly less than 0.6 in most basins. Note that h varies slightly from region to region, and also slightly decreases for larger basins (>8,000 miÂ², or 20,720 kmÂ²). A theoretical value h = 4/7 â�� 0.571 for the exponent has been derived (Birnir, 2008).

I don't know if it has anything to do with aortic valvular area or not.

Hakki - MrsC

[ In Reply To ..]
Hakki equation - simplified version of the Gorlin equation (gold standard).

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