Vincent Lambert and euthanasia

I've read in more than one newspaper (for example in Le Figaro and The Independent) and that the case of Vincent Lambert which will now be decided by the European Court of Human Rights is a case of euthanasia. Well, in my humble opinion it is not...
Vincent Lambert suffered an accident in 2008, is in vegetative state and only lives artificially through medical support. If the machines supporting his artificial life were turned off, as his (natural) widow requested, his artificial life would cease.
The press sees the struggle of Vincent's parents for keeping their son artificially alive as based on their Catholic faith. Well, I am Catholic as well and I can recognize the immense diversity of opinions on many issues within a Church of more than one billion people. However, one practical advantage of the Catholic Church in relation to many other faiths is that it has a hierarchy of people who can clarify matters of faith and morality about these dissenting opinions. This hierarchy consults on not only renown theologians but also philosophers and scientists to make its decisions. And this is precisely what the Congregation for the Doctrine of the Faith did when it issued a Declaration on Euthanasia. In this declaration, the Church considers that euthanasia may be understood as "an action or an omission which of itself or by intention causes death, in order that all suffering may in this way be eliminated."
This is clearly not the case of Vincent Lambert. He is not suffering because he is already naturally dead in a vegetative state. As such, his widow is not fighting to put an end to his suffering but merely to stop providing his body with artificial life.
Vincent Lambert's case is not about euthanasia. It is about the distinction between natural life, that should be protected, and artificial life, that may cause, as in this case it does, suffering to other people. Mrs. Lambert is suffering not only because of the death of her husband but because his present state does not let her overcome his death. I hope Vincent's parents have this in mind in their prayers...