This study would like to contribute to the understanding of the prognostic role of behavioral symptoms in mild cognitive impairment (MCI) for the progression to dementia due to Alzheimer's disease (AD). Data were generated through an ongoing prospective longitudinal study on behavioral symptoms in MCI and dementia. Behavioral assessment was performed by means of the MFS, Behave-AD, CMAI, CSDD and Geriatric Depression Scale 30-questions (GDS-30). Cox proportional hazard models were used to test the hypothesis that behavioral symptoms in MCI increase the risk for developing AD. The study population consisted of 183 MCI patients at baseline. At follow-up, 74 patients were stable and 109 patients progressed to AD. The presence of significant depressive symptoms in MCI as measured by the CSDD (HR: 2.06; 95% CI: 1.23 - 3.44; p=0.011) and the GDS-30 (HR: 1.77; 95% CI: 1.10 - 2.85; p=0.025) were associated with an increased the risk of progression to AD. The severity of depressive symptoms as measured by the GDS-30 was a predictor for progression too (HR: 1.06; 95% CI: 1.01 - 1.11; p=0.020). Furthermore, also the severity of agitated behavior, especially verbal agitation, and the presence of purposeless activity were associated risk factors for progression, whereas diurnal rhythm disturbances in our study was associated with a decreased risk of progression.
Mild Cognitive Impairment (MCI) is a clinical concept that categorizes subjects who are cognitively in an intermediate state between normal aging and dementia. As preliminary studies provided some evidence that behavioral disturbances might predict conversion to Alzheimer's disease (AD), we set up a study that aims to investigate the prognostic value of frontal lobe symptoms for the conversion of MCI to AD. This study is part of a prospective, longitudinal study on behavioral and psychological signs and symptoms of dementia and MCI. Behavioral assessment was performed at baseline and follow-up by means of Middelheim Frontality Score (MFS), Behave-AD, Cohen-Mansfield Agitation Inventory and Cornell Scale for Depression in Dementia. The MFS is a validated clinical and behavioral assessment scale that measures frontal lobe features. Stable MCI patients (no conversion to AD during follow-up) will be compared with progressive MCI patients (conversion to AD during follow-up). Data will be analyzed by means of survival analysis. We here present preliminary results of 100 patients as follow-up, data collection and data analyses are still running. The final dataset will be presented at the ICAD meeting in July 2011. Preliminary data analysis comprises 50 stable MCI patients and 50 progressive MCI patients. The mean follow-up period is respectively 18,7 (12,0) months and 25,6 (17,8) months. The two groups differed significantly in MFS total scores and the MFS item score ‘loss of insight and judgment’. Mean MFS total score was 1,98 for stable MCI and 2,70 for progressive MCI patients. Multivariate analysis showed an increased risk of 59% for developing AD by each raise of one point on the MFS total score. Also, age increase of 1 year was linked to an increased risk of 42% for developing AD. The presence of frontal lobe symptoms in MCI showed to have an impact on the risk of conversion to AD. Consequently, these symptoms may have a prognostic value. Likewise, other behavioral symptoms should be investigated on their potential prognostic value.
Background: Behavioral disturbances belong to the core symptoms of dementia and are also common in mild cognitive impairment (MCI). The identification of sets of symptoms is clinically interesting, as interventions targeting syndromes may be more eff