It is true, what Booboo says. The grey area is consultation, and if this hasn't been done then it would appear legally it's an ethical failure and not a legal one.
We were consulted at every stage.
Consultation is a hard area, though, too, and some are far more skilled at it than others - we certainly found this to be the case when our child was in ICU, there were three doctors in particular who were quite unskilled at it. But it was there (thankfully three of the other doctors there are very gifted with it and our lead consultant is as well).
DNR isn't about quality of life but quality of death, from what I've come to understand about it. It's a decision to be made when medically, death is inevitable in the near future in any case, but may be made less dignified and even more painful and traumatic for the patient by life-prolonging procedures such as mechanical ventilation.
As while DS isn't specifically life-limiting, advanced dementia with evidence of decreasing organ functionality (PEG tube, bed bound) is.
It's a huge grey area because there are plenty of people who cannot see this for their loved ones. They beleive any life is of quality, and indeed it is, but there comes a point when death is in the near future when you need to decide what type of death is best for the patient and the quality of death is part of quality of life. Being on a vent is majorly traumatic for a patient, aside from one who is an advanced state of dementia, and sedating them to bypass that is beset with its own problems, as by-products of ventilation do indeed result in death in many who are already ill when they are ventilated.
Again, the error seems to be in lack of consulting the family and/or recording attemps to consult with them in the notes.