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Variable expression of Parkinson's disease: a base-line analysis of the DATATOP cohort. The Parkinson Study Group
J Jankovic1, M McDermott, J Carter
1Department of Neurology, Baylor College of Medicine, Houston, TX 77030.
Insights
Parkinson's disease (PD) shows clinical heterogeneity. Early-onset PD progresses slower and has better cognition than late-onset PD. PD subtypes exist, impacting disability and impairment.
Area of Science:
- Neurology
- Clinical Neuroscience
- Movement Disorders
Background:
- Parkinson's disease (PD) exhibits significant clinical heterogeneity.
- Understanding this heterogeneity is crucial for personalized treatment strategies.
- The DATATOP database offers a valuable resource for studying early PD progression.
Purpose of the Study:
- To explore clinical heterogeneity in early untreated Parkinson's disease.
- To identify distinct clinical subtypes and their progression patterns.
- To investigate the impact of age of onset and symptom presentation on PD disability.
Main Methods:
- Analysis of the DATATOP database (N=800) for early untreated Parkinson's disease patients.
- Comparison of clinical characteristics based on age of onset (early vs. late).
- Categorization and comparison of patients based on disease progression rate (malignant vs. benign) and dominant symptoms (tremor vs. PIGD).
Main Results:
- Early-onset PD (≤40 years) progressed significantly slower and maintained better cognitive function than late-onset PD (≥70 years).
- Bradykinesia and postural instability and gait difficulty (PIGD) were more common in rapidly progressing ('malignant') PD.
- PIGD-dominant PD showed greater functional impairment (intellectual, motor, occupational) compared to tremor-dominant PD.
- Higher depression scores were observed in Stage II compared to Stage I PD patients.
Conclusions:
- Parkinson's disease presents with distinct clinical subtypes influencing disease progression and patient outcomes.
- Age at onset is a significant factor in PD progression and cognitive function.
- Symptom presentation (bradykinesia/PIGD vs. tremor) and progression rate are associated with varying levels of functional disability and impairment.
Abstract:
The DATATOP database, which includes clinical information on 800 patients with early untreated Parkinson's disease (PD), is well suited to explore clinical heterogeneity in PD. Patients with early-onset PD (less than or equal to 40 years, N = 33) reached the same level of disability as the late-onset PD (greater than or equal to 70 years, N = 85) group at a significantly slower rate (2.9 vs. 1.7 years). Early-onset PD patients functioned cognitively better than late-onset PD patients. Bradykinesia, and postural instability and gait difficulty (PIGD), were more common at onset in patients with a rapid rate of disease progression ("malignant PD"; duration of symptoms less than 1 year and Hoehn/Yahr stage of 2.5, N = 11) as compared with those with a relatively slow rate of progression ("benign PD"; duration of symptoms greater than 4 years, N = 65). Comparisons of tremor-dominant PD (mean tremor score/mean PIGD score less than or equal to 1.5, N = 441) with the PIGD-dominant type (mean tremor score/mean PIGD score greater than or equal to 1.0, N = 233) provided support for the existence of clinical subtypes. The PIGD group reported significantly greater subjective intellectual, motor, and occupational impairment than the tremor group. Stage II patients had higher depression scores than stage I patients. Among the patients participating in the DATATOP, older age at onset with bradykinesia, or with the PIGD form of PD, is associated with more functional disability than when the symptoms are dominated by tremor or begin at a younger age.