Euthanasia is the intentional premature termination of another person's life either by direct intervention (active euthanasia) or by withholding life-prolonging measures and resources (passive euthanasia), either at the express or implied request of that person (voluntary euthanasia), or in the absence of such approval (non-voluntary euthanasia). Involuntary euthanasia - where the individual wishes to go on living - is an euphemism for murder.
Modern medicine seems to be preoccupied with delusions of omnipotence and the need to avoid the narcissistic injury to the doctor’s ego that death constitutes. This preference of the profession’s image over the patient’s welfare and quality of remaining life is patently unethical. But, to my mind, passive euthanasia is equally immoral. The abrupt withdrawal of medical treatment, feeding, and hydration results in a slow and (potentially) torturous death. It took Terri Schiavo 13 days to die, when her tubes were withdrawn in the last two weeks of March 2005. Since it is impossible to conclusively prove that patients in PVS (Persistent Vegetative State) do not suffer pain, it is morally wrong to subject them to such potential gratuitous suffering.