March 20, 2026

@michaelokun

The Sydney multi-center study of Parkinson’s disease: Why it mattered, how it was done, and what we learned. What does longitudinal mean? Longitudinal means following the same group of folks over many years to understand how a disease truly unfolds over time. Hely describes in a new paper in Movement Disorders the story behind the Sydney multi-center study of Parkinson’s disease and what decades of careful observation have taught us. Key Points: - The study followed newly diagnosed folks over decades and revealed the natural history of Parkinson’s disease in the levodopa era. - Non-motor symptoms such as dementia, imbalance, and autonomic dysfunction frequently became the dominant drivers of disability over time. - Dementia increased steadily as the disease progressed and was strongly linked to age, highlighting the long-term cognitive burden of Parkinson’s disease. My take: This paper is a reminder that Parkinson’s disease is not just about tremor and stiffness. It is a complex, evolving condition where the long game matters. The Sydney study forced the field to look beyond motor symptoms and to pay attention to what truly impacts daily life over time. It also highlighted the importance of following folks carefully across years and decades, because the biggest lessons in Parkinson’s disease frequently emerge slowly. Here are 5 points that resonated w/ me: 1- Parkinson’s disease is a long journey and understanding it requires long-term follow up, not short snapshots. 2- Non-motor symptoms frequently become the most important challenges, even when motor symptoms are well treated. 3- Dementia risk increases over time and must be actively monitored and addressed in care planning. 4- Levodopa remains a highly effective treatment and fears about its long-term toxicity were not supported by real world data. 5- The future of Parkinson’s care will require a more holistic approach that targets both motor and non-motor symptoms across the disease course. https://movementdisorders.onlinelibrary.wiley.com/doi/10.1002/mds.70245 #michaelokun #fixelinstitute #parkinson