[Premorbid personality and aggressive behavior: a study with residents of psychogeriatric nursing homes].

From experimental research it appears that personality plays a role in causes and onset of aggressive behavior in adults. However, studies about the influence of premorbid personality on aggressive behavior of older persons with dementia show contradictory results. In this study we gathered data on personality and behavior of 166 residents of psychogeriatric nursing homes. Nursing staff filled out the Cohen-Mansfield Agitation Inventory (Dutch version, CMAI-D). Proxy family members completed the Hetero Anamnestic Personality questionnaire (HAP). Results showed that on the CMAI-D aggression could be distinguished from other forms of agitation. Four subscales of the HAP showed significant positive correlations with aggression as measured with the CMAI-D. These subscales were: Antagonism, Whimsical and impulsive behavior, Rigid behavior, and Being vulnerable in social interactions. Although the influence of personality decreased with increasing cognitive impairment, it was still present in stage 6 of the Reisberg Global Deterioration Scale. In depth analysis items of the HAP revealed a first profile of the aggression prone personality.