The therapeutic proportionality standard: a new content for the best interests standard.

The standard of the patient's best interests is the main bioethical standard used in the decision-making process that involves incompetent patients (i.e. neonatology, pediatric patients and incompetent adults). This standard has been widely criticized as being self-destructive, individualistic, vague, unknown, dangerous and open to abuse. With the purpose of defending it, several reforms of this standard have been proposed, especially in the pediatric field. We propose a redefinition of the standard based on two concepts: 1) medical futility as a negative criterion, and 2) the principle of proportionality as a positive criterion. Our work includes a new relationship between concepts in classical moral theology (i.e. ordinary / extraordinary; proportionate / disproportionate) applied to the bioethics of life-sustaining treatments for incompetent patients.