Using computerized spiral analysis to evaluate deep brain stimulation outcomes in Parkinson disease

Area of Science:

• Neurology
• Biomedical Engineering
• Movement Disorders

Background:

• Clinical evaluation of Parkinson disease (PD) after deep brain stimulation (DBS) can be subjective and insensitive to subtle changes.
• Spiral analysis offers a computerized method to objectively quantify kinematic, dynamic, and spatial aspects of spiral drawing.

Purpose of the Study:

• To assess the efficacy of spiral analysis in monitoring DBS treatment effects in PD patients.
• To determine if spiral analysis can provide objective insights into post-operative clinical features.

Main Methods:

• Retrospective evaluation of spiral drawing data from PD patients undergoing subthalamic nucleus (STN) or ventral intermediate thalamus (Vim) DBS.
• Calculation and comparison of five spiral indices (Severity, Smoothness, Tremor, Variability, Tightness) pre- and post-operatively.

Main Results:

• Significant improvements were observed in Severity, Smoothness, and Tremor indices following both STN and Vim DBS.
• The Variability index improved specifically with Vim DBS.
• No significant changes were detected in the Tightness index for either STN or Vim DBS.

Conclusions:

• Spiral analysis effectively monitors DBS effects in PD, providing objective data on motor symptom changes.
• The findings suggest DBS improves overall motor function but not micrographia, as indicated by the unchanged Tightness index.
• Spiral analysis holds potential for use in clinical trials and research on neural pathways affected by DBS.