Classification of euthanasia
Euthanasia may be classified according to whether a person gives informed consent into three types: voluntary, non-voluntary and involuntary.[24][25]
There is a debate within the medical and bioethics literature about whether or not the non-voluntary (and by extension, involuntary) killing of patients can be regarded as euthanasia, irrespective of intent or the patient's circumstances. In the definitions offered by Beauchamp and Davidson and, later, by Wreen, consent on the part of the patient was not considered as one of their criteria, although it may have been required to justify euthanasia.[12][26] However, others see consent as essential.
Voluntary euthanasia
Main article: Voluntary euthanasia
See also: Right to die
Euthanasia conducted with the consent of the patient is termed voluntary euthanasia. Active voluntary euthanasia is legal in Belgium, Luxembourg and the Netherlands. Passive voluntary euthanasia is legal throughout the U.S. per Cruzan v. Director, Missouri Department of Health. When the patient brings about his or her own death with the assistance of a physician, the term assisted suicide is often used instead. Assisted suicide is legal in Switzerland and the U.S. states of Oregon, Washington, Montana and Vermont.
Non-voluntary euthanasia
Main article: Non-voluntary euthanasia
Euthanasia conducted where the consent of the patient is unavailable is termed non-voluntary euthanasia. Examples include child euthanasia, which is illegal worldwide but decriminalised under certain specific circumstances in the Netherlands under the Groningen Protocol.
Involuntary euthanasia
Main article: Involuntary euthanasia
Euthanasia conducted against the will of the patient is termed involuntary euthanasia.
Passive and active euthanasia
Voluntary, non-voluntary and involuntary euthanasia can all be further divided into passive or active variants.[27] Passive euthanasia entails the withholding of common treatments, such as antibiotics, necessary for the continuance of life.[2] Active euthanasia entails the use of lethal substances or forces, such as administering a lethal injection, to kill and is the most controversial means. A number of authors consider these terms to be misleading and unhelpful.[2]
In the United Kingdom, the pro-assisted dying group Dignity in Dying cite conflicting research on attitudes by doctors to assisted dying: with a 2009 Palliative Medicine-published survey showing 64% support (to 34% oppose) for assisted dying in cases where a patient has an incurable and painful disease, while 49% of doctors in a study published in BMC Medical Ethics oppose changing the law on assisted dying to 39% in favour