Well, the two aspects of the question are not altogether different, because the underlying philosophy for respecting the right to self-determination continues to apply in both. The laws of genetics tell us, for example, that people whose parents have had a stroke also risk having one, and that they are probably worried about it. They say to themselves that they would like to be able to guarantee their right to medical assistance in dying through advanced medical directives.
I believe Mr. Arseneault suggested earlier that there could be an update process to review advance requests every five years, for people to confirm or cancel their decision, if they wish. It's true that this would not exactly be contemporary to the request, if I can use that wording, and it would be up to people to take responsibility for confirming or cancelling their decision. It would amount to a guarantee, or a safeguard, that could facilitate matters.
I'd simply like to mention that in nursing homes and palliative care units I often saw people who had had a stroke and were incapacitated, suffering, and asking to die every day.
I don't see how we could make a distinction between people who have received a diagnosis of a disease about which they can do absolutely nothing, and people who have had a stroke. A stroke happens suddenly, unexpectedly and unforeseeably. These people would be deprived of a right available to others.