Prevalence of pain phenotypes and co-morbidities of chronic pain in Parkinson's Disease

OBJECTIVE: The prevalence of chronic pain in Parkinson's disease (PD) in neurology practices ranges from 24 % to 83 %. To determine whether this prevalence is accurate across patients with PD, we leveraged data from electronic medical records in 80 inpatient and outpatient general practice settings.

METHODS: We explored the prevalence of chronic pain in patients with PD relative to age and sex-matched controls in a large international database with electronic medical records from over 250 million patients (TriNetX Cambridge, MA, USA). We described demographics, co-morbid conditions and medication differences between patients with PD and without PD who have chronic pain.

RESULTS: Extracted data included 4510 patients with PD and 4,214,982 age-matched control patients without Parkinson's Disease. A chronic pain diagnosis was identified in 19.3 % of males and 22.8 % of females with PD. This differed significantly from age-matched patients without PD who had a significantly lower prevalence of chronic pain 3.78 % and 4.76 %. Significantly more PD patients (both male and females) had received tramadol, oxycodone, and neuropathic agents (p<0.001) than patients without PD. Females with PD more often received anti-depressants than males with PD (p<0.05), corresponding with a significantly higher prevalence of depression.

CONCLUSION: Chronic pain in patients with PD is five times as common as in age-matched controls in general practice settings. Patients with PD have a greater prevalence of comorbid conditions that affect development of chronic pain. Whether the pain or the PD is causative to those conditions remains to be elucidated.