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Cognitive functioning after subthalamic nucleotomy for refractory Parkinson's disease.

R J McCarter1, N H Walton, A F Rowan

  • 1Department of Neuropsychology, Frenchay Hospital, Bristol, UK.

Journal of Neurology, Neurosurgery, and Psychiatry
|June 23, 2000
PubMed
Summary

Subthalamic nucleotomy in Parkinson's disease patients showed no significant group cognitive decline. However, some individuals experienced specific changes in memory and attention, particularly after left-sided surgery.

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Area of Science:

  • Neuroscience
  • Neurosurgery
  • Cognitive Psychology

Background:

  • Parkinson's disease (PD) is a neurodegenerative disorder affecting motor control.
  • Subthalamic nucleus (STN) deep brain stimulation is a common treatment for PD.
  • The cognitive effects of ablative surgery targeting the STN require careful evaluation.

Purpose of the Study:

  • To assess the cognitive impact of subthalamic nucleotomy in Parkinson's disease patients.
  • To identify potential adverse cognitive effects following this surgical intervention.
  • To correlate cognitive changes with specific surgical laterality.

Main Methods:

  • Twelve Parkinson's disease patients underwent stereotactic subthalamic nucleotomy.
  • Comprehensive pre- and post-operative neuropsychological assessments were performed.

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  • Cognitive domains evaluated included attention, memory, executive function, language, and verbal intellect, with tests minimizing motor symptom interference.

    • Main Results:

    • No statistically significant cognitive decline was observed for the patient group overall.
    • Individual patients demonstrated reliable changes in verbal memory, attention, and planning post-surgery.
    • Left-sided subthalamic nucleotomy was associated with a higher incidence of postsurgical cognitive deterioration.

    Conclusions:

    • Subthalamic nucleotomy appears to have minimal adverse cognitive effects in Parkinson's disease patients as a group.
    • Discrete neuropsychological changes can occur in some individuals, aligning with basal ganglia cognitive function theories.
    • Further research is warranted to understand the nuances of cognitive changes after STN ablative surgery.