[Mental competence and long term care: an uncomfortable relationship].

Competency is an important concept in medical ethics as well as in law. It refers to the moral principles of self-determination and autonomy, which are of central importance in the ethics of health care. These moral principles also prevail in nursing home care. Societal prejudice concerning nursing home patients suggests that the inhabitants of a nursing home are almost by definition incompetent. We assert that such prejudice rests on certain societal delusions and misinterpretations of incompetency five of which are subsequently analysed. Next we discuss the dominant conception of competency in terms of decisional capacity. This conception is predominantly oriented towards cognitive abilities and underplays affective capacities. We confront this dominant conception with an alternative proposal of competency in terms of 'the capacity to value', which--to our opinion--more properly reflects nursing home practice concerning questions of competency. Finally we address the limitations of any concept of competency or decisional capacity in relation to the moral issues of 'good care' for demented elderly. As an alternative we draw attention to the moral perspective of the 'ethics of care'.