Absent clarification, the opinion of one qualified (licensed) medical doctor is enough to trigger the operation of the Living Will.
So, a relative can conspire with a euthenasia activist medical practitioner, have you committed to a hospice where, if you are not 'PVS' when you are admitted, you certainly will be by the time they have dosed you with enough sedation and morphine to 'prove' the diagnosis was 'correct' ?
Assisted by the fact that in a hospice, no treatment facilities exist to care for any underlying conditions, such as heart disease. Neat.