Dementia Patients What Can You Say Concerning Early Episodic Dementia Patients Who Refuse To Be Resuscitated?

What can you say concerning early episodic dementia patients who refuse to be resuscitated? - dementia patients

A patient who is known to forget things is terminally ill to refuse resuscitation, how ethical principles can be associated with this situation? And how it relates to legal questions?
Let's talk about autonomy, consent and other principles such as charities, injury prevention, utilitarianism, etc.
How this affects the ethical issues that nurses are expected to work in the best interest of the patient? Could it be that the patient is fully informed about their options, even if it seems he / she is.