[Alzheimer's disease. Relationship between time of disease and its staging]

Forty-nine patients with clinical diagnosis of Alzheimer's disease were submitted to neuropsychological evaluation for staging the disease. The time of the initial symptoms was correlated to the stage of the disease. The evolution was protracted in 28.5% of the patients with only insidious memory deterioration. For another group of patients (12.2%) the evolution was serious since the beginning of the disease, with apraxo-agnosic signs. For the 34 patients with apraxo-agnosic impairment, in 50% this manifestation began in the first two years of the disease. Data suggest the occurrence of two subgroups. In the first the evolution of the disease is rapid, and in the second it is protracted. Also, they suggest that the evolution in the first two years is critical for characterizing the severity of progression in the clinical manifestations of Alzheimer's disease.