The alternative to euthanasia? UK study, Aug. 12, 2009.
The recent ruling by the law lords in the case of Debbie Purdy has re-ignited the debate over assisted suicide.
Polls suggest that while a majority of the public would support a change in the law to allow assisted dying, most doctors are against it.
But there is evidence that some clinicians may already be using continuous deep sedation (CDS), as a form of "slow euthanasia".
Research suggests use of CDS in Britain is particularly high - accounting for about one in six of all deaths.
Every year more than 1,000 people are admitted onto the wards at St Christopher's Hospice in Sydenham, south London.
It is at the forefront of research and education in end-of-life palliative care.
Dr Nigel Sykes, medical director, said only a handful of patients each year require sedation to make them unconscious at the end of their lives.
"Deep sedation, in the sense that you are wanting to make someone unaware of their surroundings, they are asleep, comatose, that is something that is required very uncommonly indeed."
Last option
Dr Sykes said CDS can be appropriate for patients who become confused and deeply agitated - but only when nothing else can relieve their distress.
But research by Clive Seale, professor of medical sociology at Bart's and the London School of Medicine and Dentistry, suggests the use of CDS across the UK is far from "uncommon".
"The only other two countries where the prevalence has been measured is in the Netherlands and Belgium," said Professor Seale.
"The surprising thing was that in the UK the prevalence of continuous deep sedation until death was very high indeed, 16.5% of all UK deaths."
That is twice as high as in Belgium and the Netherlands.
But while rates of CDS in the Netherlands appear to be rising, the use of euthanasia has declined.
Cancer patients
Dr Judith Rietjens, from Erasmus University Medical Centre in Rotterdam, said this shift is particularly marked among GPs looking after cancer patients.
"It seems that there's substitution from the practice of euthanasia to the practice of continuous deep sedation," she said.
"We can see in our study that those sub-groups where we saw an increase of continuous deep sedation - just in those sub-groups - we saw a lowering of the frequency of euthanasia."
Professor Seale thinks something similar may be happening in the UK.
"There is good evidence from the Netherlands and Belgium to show that quite a lot of doctors who find providing euthanasia very emotionally distressing and ethically difficult, find that providing continuous deep sedation is an easier thing to do," he said.
"In those countries euthanasia is an option - it's legal. In the UK it isn't.
"Whether doctors in the UK are thinking in this way, and nurses as well, is something which is worth exploring more."
There are fears that CDS is being used inappropriately.
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