Abstract
A patient’s decision-making capacity or competence is among the prerequisites for valid consent to medical treatment, and is regarded as the gatekeeping element in ensuring respect for patients’ self-determination. The issue is especially relevant in the case of vulnerable persons, such as patients who are cognitively or mentally impaired, and where medical decisions carry far-reaching consequences. As a grounding principle, DMC is a priori assumed, and challenged only when substantial doubts arise owing to observed or assumed deficiencies of the capacities commonly considered relevant for competent decision making ; in this sense, the onus is on...