[Phenomenology and treatment of delirium in Alzheimer's disease].

Meaning of psychiatric disorders in Alzheimer' disease has been underestimated for a long time. Among these disorders, delusional states represent the most frequent causes of such phenomenon after depressive disorders. It's probably of importance to distinguish delusional and paranoid ideation from the missidentidentification phenomenon. Neuroleptic treatment contribute to improve the quality of life of these delusional patients.