Euthanasia and palliative sedation are categorically distinct, so the notion that we can use the latter to achieve the former is untenable.
Barbiturates have been used for several purposes including to treat sleep disorders, epilepsy and traumatic brain injury – as well as in anaesthesia and psychiatry.
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It’s possible the difference between Australia and the Netherlands (where euthanasia and assisted suicide are legal) lies more in the way we think about what we are doing than what actually happens.