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Arch Gen Psychiatry. 2007 Dec;64(12):1385-92.

Increased risk of depressive and anxiety disorders in relatives of patients with Parkinson disease.

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  • 1Division of Epidemiology, Department of Health Sciences Research, Mayo Clinic, 200 First St SW, Rochester, MN 55905, USA.

Abstract

CONTEXT:

Relatives of patients with Parkinson disease (PD) have an increased risk of PD and other neurologic disorders; however, their risk of psychiatric disorders remains uncertain.

OBJECTIVE:

To study the risk of depressive disorders and anxiety disorders among first-degree relatives of patients with PD compared with first-degree relatives of controls.

DESIGN, SETTING, AND PARTICIPANTS:

In a population-based, historical cohort study, we included 1000 first-degree relatives of 162 patients with PD and 850 first-degree relatives of 147 controls. Both patients with PD and controls were representative of the population of Olmsted County, Minnesota.

MAIN OUTCOME MEASURES:

Documentation of psychiatric disorders was obtained for each relative separately through a combination of telephone interviews with the relatives (or their proxies) and review of their medical records from a records-linkage system (family study method). Psychiatric disorders were defined using clinical criteria from the DSM-IV or routine diagnoses.

RESULTS:

We found an increased risk of several psychiatric disorders in first-degree relatives of patients with PD compared with first-degree relatives of controls (hazard ratio [HR], 1.54; 95% confidence interval [CI], 1.21-1.95; P <.001). In particular, we found an increased risk of depressive disorders (HR, 1.45; 95% CI, 1.11-1.89; P = .006) and anxiety disorders (HR, 1.55; 95% CI, 1.05-2.28; P = .03). The results were consistent in analyses that adjusted for type of interview, excluded relatives who developed parkinsonism, or excluded relatives who developed both a depressive disorder and an anxiety disorder.

CONCLUSION:

These findings suggest that depressive disorders and anxiety disorders may share familial susceptibility factors with PD.

PMID:
18056546
[PubMed - indexed for MEDLINE]
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