Abstract (eng)
Background: Subjective cognitive complaints (SCC) and their clinical significance were discussed controversial until now. In mild cognitive impairment (MCI) and subjective cognitive decline (SCD) the SCC are associated with progression to Alzheimer's disease (AD) or even Parkinson disease dementia (PDD). Objectives: To determine differences of SCC on the basis of patients’ reports among subjects with SCD, MCI and Parkinson disease (PD). Design: Longitudinal study with one follow up examination. Participants: A clinical sample of dementia free subjects with SCC (n=168), aged 50 and older, who came to the memory outpatient clinic/ Department of Neurology. Results: MCI patients have a higher risk than the patients with SCD in developing AD (OR = 7.3 [CI 0.9 to 61.2]. The tested groups (SCD, MCI, PD) differed (p <. 001) significantly in their SCC. No significant differences between the AD patients, and the non-converted were discovered. The groups of subjects, which detoriated, remained stable and improved in their SCC differed also significantly (p <. 05). No time effect could be confirmed in all analyses. For conversion to AD we found an area under the curve (AUC) of .62 for the FAI. Conclusion: SCC allows no differentiation between AD and Non-AD patients based on the initial investigation.