Variation in Recent Onset Parkinson's Disease: Implications for Prodromal Detection

Area of Science:

• Neurology
• Neuroscience
• Clinical Medicine

Background:

• Early detection of prodromal Parkinson's disease (PD) is essential for testing neuroprotective drugs.
• Disease variations can impact the accuracy of prodromal PD detection.

Purpose of the Study:

• To determine the prevalence of four key non-motor prodromal PD markers: hyposmia, REM sleep behavior disorder (RBD), constipation, and depression.
• To evaluate the sensitivity of non-motor screening tools for detecting prodromal PD in an early clinical PD cohort.

Main Methods:

• Assessed hyposmia, RBD, constipation, and depression in a cohort of recent-onset PD cases.
• Applied proposed non-motor screening criteria to evaluate case detection sensitivity.

Main Results:

• In 1,719 PD cases, hyposmia was most prevalent (72.2%), followed by RBD (43.3%), depression (22.1%), and constipation (21.5%).
• Increasing non-motor features correlated with younger age, higher motor scores, and greater cognitive impairment.
• Screening criteria demonstrated varying sensitivity and selectivity, with some criteria identifying younger patients or those with a higher non-motor burden.

Conclusions:

• Different non-motor screening methods exhibit varying sensitivity and selectivity when applied to early clinical PD cohorts.
• The choice of screening criteria influences the age and phenotype of detected prodromal PD cases.