Alzheimer's disease is a degenerative disorder of unknown cause, leading to the gradual damage of the brain cells structure and function. The disease is the most common form of dementia representing more than 50% of the cases. Gradual loss of memory, deterioration of cognitive functions, confusion, change in mood and behavior and kinetic disturbances characterize Alzheimer's disease. These findings along with the patient's history, the complete clinical and neurological examination, the neuropsychological tests, the psychiatric examination and the laboratory tests contribute to the diagnosis of the disease.
The early diagnosis of Alzheimer's disease allows the doctors to make plans for the therapeutic interventions in the years coming. According to the Alzheimer's Disease Association, diagnosis of Alzheimer's disease is classified into 3 categories: a) possible Alzheimer's disease, in witch doctor has excluded all the possible disorders to provoke dementia, b) probable Alzheimer's disease, where Alzheimer's disease is the main cause of symptoms, but there is another disorder which interferes with Alzheimer's disease, and c) definite Alzheimer's disease, witch can only be characterized like that after biopsy or autopsy.