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Physiologic study of the subthalamic volume.

A Zincone1, A Landi, R Piolti

  • 1Department of Neurological Science, University of Milan Bicocca, Monza, Italy.

Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology
|August 7, 2001
PubMed
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Deep brain stimulation (DBS) targeting areas near the subthalamic nucleus (Stn) effectively controls Parkinson's disease (PD) symptoms. This research identifies an alternative brain region that provides symptom relief comparable to traditional Stn stimulation.

Area of Science:

  • Neurosurgery
  • Neurology
  • Movement Disorders

Background:

  • Deep brain stimulation (DBS) is a primary treatment for advanced Parkinson's disease (PD).
  • Subthalamic nucleus (Stn) stimulation effectively manages PD symptoms like rigidity, dyskinesia, and tremor.
  • Precise target localization through intraoperative mapping is crucial for effective DBS.

Purpose of the Study:

  • To explore functional brain volumes for DBS beyond the traditional Stn target.
  • To identify alternative stimulation areas that yield comparable PD symptom control to Stn DBS.
  • To correlate intraoperative macrostimulation findings with anatomical data.

Main Methods:

  • Per-operative macrostimulation was performed in 22 patients undergoing bilateral Stn DBS.

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  • A brain volume from 6 mm above to 4 mm below the Stn was systematically explored.
  • Positive, collateral, and adverse effects were recorded at 2 mm intervals during acute stimulation.

    • Main Results:

    • Stimulation within a specific volume, including the zona incerta, Forel's fields, and anterior thalamus, produced significant PD symptom reduction.
    • The observed therapeutic effects were comparable to those achieved with direct Stn stimulation.
    • Acute stimulation results were correlated with stereotactic atlas data for anatomical localization.

    Conclusions:

    • A functionally homogeneous brain volume exists near the Stn that can effectively treat Parkinson's disease symptoms.
    • This alternative target volume offers comparable therapeutic benefits to Stn DBS, potentially expanding DBS treatment options.
    • Intraoperative mapping is essential for identifying optimal stimulation sites for Parkinson's disease management.