Where does palliative sedation become euthanasia?

Where does palliative sedation become euthanasia?
A special issue of the journal Theoretical Medicine and Bioethics is devoted to the controversial issue of palliative sedation. As the editor, bioethicist Daniel Sulmasy, points out, palliative sedation has special relevance for Christians. For them, the relief of unnecessary suffering is a duty, but euthanasia is wrong. Identifying the right response to suffering at the end of life is often perplexing, especially since some doctors use palliative sedation as terminal sedation – rendering patients unconscious and withdrawing hydration and nutrition until they die.