摘要：Obtaining a valid informed consent from an elderly person, especially when frail or with possible dementia, will initially involve the practical problem of assessing the ability to communicate. Only then can the assessment of decisionmaking capacities and the obtaining of informed consent for participation in research be progressed. Normal ageing does not impair communication or decision-making, but pathological status does, this may, or may not, be associated with the ageing process. Perceptual impairment may, in particular, interfere with the communication. Once the subject appreciates and understands that he/she has the right to make a choice then it is important to ensure that he/she fully understands the decision he/she is being asked to make and can communicate and explain in his/her own words why a particular decision was made. In this paper suggestions, based upon existing guidelines or texts, will be made as to how to improve communication with the elderly and the capabilities that the subject must demonstrate to show his capacity to make a decision will be discussed.
