Giving the Heart
The algorithm of medical ethics. If you can help everyone and the condition of everyone is equally difficult, then the first is the help of the youngest. Not in the sense of "children are our future", but in the sense of "who is less likely to kick off the bowls during the operation and will be able to exploit the heart for longer."
This factor alone is enough. To decide who will bring the most benefit to society is to guess on the coffee thicker. The priest may be a pedophile, the cancer medicine will be toxic and ineffective, the mother of three children will bring all three to psychic. On the contrary, a 95-year-old grandmother can save the whole house from terrorists by making a claim on suspicious people, down can be a carrier of a rare blood group and donate it for the rest of her life, the singer can hit the charity and sponsor a child (or three). The hell knows how life turns.