Perceived control and well-being in Parkinson's disease.

Sense of control in the context of an uncontrollable chronic illness is explored by analyzing the impact of the patient's perceived control over symptoms (PCS) and perceived control over disease progression (PCDP) on patient and caregiver outcomes. PCS was significantly associated with patient well-being, caregiver well-being, and less caregiver burden. No relationship was found between PCDP and patient well-being, caregiver well-being, or caregiver burden. Findings support the importance of symptom management, viewing the patient-caregiver dyad as a unit, and the need for future research on control and transition points in chronic illness.