Informed Consent and Decision-Making for Patients with Acquired Cognitive Impairment.

Informed consent (IC) is an ethical and legal requirement grounded in the principle of autonomy. Cognitive impairment may often interfere with decision-making capacity necessitating alternative models of ethically sound deliberation. In cases where the patient lacks decision-making capacity, one must determine the appropriate decision-maker and the criteria used in making a medical decision appropriate for the patient. In this article, I critically discuss the traditional approaches of IC, advance directives, substituted judgment, and best interests. A further suggestion is that thinking about sufficient reasons for or against a course of action is a conceptual enrichment in addition to the concepts of interests and well-being. Finally, I propose another model of collective consensus-seeking decision-making.