[Persistent vegetative state: medical, moral, legal and economic aspects].

The classical definition of persistent vegetative state describes patient who is wakeful but not awake, and indicates intact function of the brain stem and no function of brain cortex. The presence and the degree of awareness is most difficult to assess and causes moral and legal controversies concerning the management of persistent vegetative state. The absence of the perceptual awareness may be the most important clinical characterization for diagnosis. Differential diagnosis includes coma, brain death, locked-in syndrome and minimally responsive state. The pressure of economical factors (managed care) on medical care makes this problem even more complicated.