Is there a difference between palliative sedation and euthanasia?

Is there a difference between palliative sedation and euthanasia?
One common argument in favour of legalising euthanasia is that several accepted medical practices already involve hastening the death of patients. Some ethicists claim, for example, that we are already hastening patients’ deaths in palliative care contexts through the administration of toxic levels of opioids and sedatives to patients. In palliative sedation -- a relatively common procedure in end of life scenarios -- doctors administer strong doses of drugs such as midazolam to sedate a patient. Ostensibly this is done to relieve refractory symptoms, yet some suggest that doctors are fully aware that the drugs may bring about a quicker death. In light of this, some ethicists argue that we need not be so concerned about hastening death through euthanasia -- this is a mere extension of the already existing practices in palliative care.