Prevalence and treatment of depression in Parkinson's disease.

Parkinson's disease (PD) is a progressive neurological condition with debilitating symptoms, and depression is a common comorbid condition of this disease. The authors review existing literature on the prevalence and treatment of depression in PD. Prevalence estimates of depression vary widely, ranging from 7%-76%. This variation is due to inconsistent methodology. Treatment options for depression in PD include medication therapy, electroconvulsive therapy (ECT), and psychotherapy. There are few randomized controlled trials of these treatment options. The authors argue for more systematic and controlled research examining both the prevalence and treatment of depression in PD.