Delusional disorder in old age and the risk of developing dementia: a nationwide register-based study

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Alex Kørner, Ana G Lopez, Lise Lauritzen, Per K Andersen, Lars V Kessing

OBJECTIVE: To examine whether very late first-contact delusional disorder carries a risk for later development of dementia. METHODS: By linkage of the psychiatric and the somatic nationwide registers of all out- and in-patients with hospital contact in Denmark, we included all 60+ patients with first ever from 1 January 1994 to 31 December 2001 with the index main diagnosis: delusional disorder. First contact osteoarthritis patients as well as the general population were used as controls. A total of 1,437 patients with persistent delusional disorder and 7,302 patients with osteoarthritis were included. Median follow-up time until first diagnosis of dementia at discharge was 1.87 and 4.40 years, respectively. The probability of getting a dementia diagnosis was estimated using Poisson regression models with dementia as the outcome of interest. RESULTS: Patients with very late first-contact delusional disorder had an 8.14 (95% CI, 6.51; 10.19) times increased rate of subsequently developing dementia compared with very late first contact osteoarthritis patients. Compared with the general population the rate ratio was 5.49 (95% CI, 4.81; 6.26). CONCLUSION: Very late first-contact delusional disorder increases the risk of subsequently getting a diagnosis of dementia 5-8 times compared with osteoarthritis patients and the general population.
Original languageEnglish
JournalAging & Mental Health
Volume12
Issue number5
Pages (from-to)625-9
Number of pages4
ISSN1360-7863
DOIs
Publication statusPublished - 2008

Bibliographical note

Keywords: Age Factors; Aged; Aged, 80 and over; Case-Control Studies; Dementia; Denmark; Female; Humans; Male; Middle Aged; Osteoarthritis; Poisson Distribution; Registries; Risk; Risk Assessment; Schizophrenia, Paranoid

ID: 10616858