Early Deep Brain Stimulation for Parkinson's Disease: A Systematic Review and Meta-Analysis.

Area of Science:

• Neurology
• Neurosurgery
• Medical Technology

Background:

• Parkinson's disease (PD) is a progressive neurodegenerative disorder impacting motor and non-motor functions.
• Current pharmacotherapy for PD has diminishing efficacy over time.
• Deep brain stimulation (DBS) is effective for advanced PD, with emerging evidence for earlier intervention.

Purpose of the Study:

• To systematically review and meta-analyze randomized controlled trials (RCTs) comparing subthalamic DBS plus best medical therapy (BMT) with BMT alone in early PD.
• To evaluate the efficacy and safety of early DBS intervention in Parkinson's disease.

Main Methods:

• Systematic review and meta-analysis adhering to PRISMA guidelines.
• Searched MEDLINE, Embase, and Cochrane Library (2002-2025) for studies on early DBS in PD.
• Included RCTs, secondary analyses, observational studies, and unpublished trials; meta-analyses focused on randomized comparisons.

Main Results:

• Studies included younger patients with PD duration ≤8 years and early motor complications.
• Pooled RCT data indicated a consistent quality-of-life benefit with early DBS.
• Motor and medication outcomes favored early subthalamic DBS but showed heterogeneity and imprecision; safety was comparable to standard DBS.

Conclusions:

• Early DBS, particularly in patients <60 years, <10 years from diagnosis, Hoehn-Yahr stage ≤3, with early motor complications and no dementia, may delay quality-of-life decline compared to BMT alone.
• Further large-scale randomized studies are essential to confirm safety, determine optimal timing, and identify subgroups benefiting most from early DBS in PD.