Bilateral subthalamotomy in Parkinson's disease: initial and long-term response

Area of Science:

• Neurosurgery
• Neurology
• Movement Disorders

Background:

• Parkinson's disease (PD) is a progressive neurodegenerative disorder.
• Advanced PD often presents with motor fluctuations and levodopa-induced dyskinesias.
• Subthalamotomy is a surgical option for managing advanced PD symptoms.

Purpose of the Study:

• To evaluate the long-term effects of bilateral subthalamotomy in patients with advanced Parkinson's disease.
• To compare staged versus simultaneous bilateral subthalamotomy.
• To assess improvements in motor function, activities of daily living, and medication requirements.

Main Methods:

• An open-label pilot study involving 18 patients with advanced PD.
• Patients underwent either staged (n=7) or simultaneous (n=11) bilateral subthalamotomy.
• Assessments included the Core Assessment Program for Intracerebral Transplantation (CAPIT) protocol, motor tests, and neuropsychological evaluations over a minimum of 3 years.

Main Results:

• Significant reductions in Unified Parkinson's Disease Rating Scale (UPDRS) motor scores (off-drug: 49.5%, on-drug: 35.5%) at last assessment.
• Marked improvement in cardinal PD features and activities of daily living (ADL) scores (P < 0.01).
• Reduced levodopa-induced dyskinesias (50%) and daily levodopa dose (47%).

Conclusions:

• Bilateral subthalamotomy offers significant and lasting motor benefits for advanced Parkinson's disease.
• Clinical outcomes are variable, likely influenced by lesion location and volume.
• Further refinement of the surgical technique is necessary to optimize patient outcomes.