The approach is graphically summarised here. It’s based on Alex Yartsev‘s awe-inspiring Deranged Physiology post, as well as  Cohen et al (2016),  Lundy & Fischer (2010) and Evenson (2016).

The final decision-loop ignores the third possibility, which is that the patient is stable enough to go on living with a chronically-discharging ECF. I had to draw the line somewhere. Either way they won’t be in your ICU.