The impact of cognitive performance on quality of life in individuals with Parkinson's disease.

Background: Evidence points to the occurrence of cognitive impairment in all stages of PD, constituting a frequent and debilitating symptom, due to high impact on quality of life and mortality of patients.

Objective: To correlate cognitive performance with quality of life in PD.

Methods: The sample was drawn from a Movement Disorders Clinic of a reference hospital in Porto Alegre.