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Hello,
In the User guide, it states, "We assume that 4% of the cardiac output will go to the coronaries. In other words, the total coronary resistance is 24x that of the systemic vascular resistance that we computed above." Could someone please explain how one arrives at that conclusion?

Also, is it possible for me to use the relation between % cardiac output and the resistance ratio to determine the resistance in the LCX given the % of the cardiac output that goes into the LCX?

Thank You,
AP

Assuming that the coronary circuit is parallel to the systemic circuit, P/Rcor=P/Rsystem *4/96. Therefore Rcor is ~ 24Rsystem. Yes, you can estimate the LCX resistance in this way. This is just an initial approximation. You need to adjust the values to achieve a desired flow split.