Patients are to be treated justly, fairly, amp; equally. What happens when resources are scarce amp; only one patient can be treated?

Patients are to be treated justly, fairly, & equally.

What happens when resources are scarce & only one patient can be treated?

What happens if caregivers decide that age should be the determining factor?

What happens if the patient saved is terminal & has an advanced directive in his wallet requesting no heroic measures to save his life?