Weight gain following unilateral pallidotomy in Parkinson's disease

Acta Neurol Scand. 2000 Feb;101(2):79-84. doi: 10.1034/j.1600-0404.2000.101002079.x.


Objective: To determine the clinical correlates and infer pathogenesis of weight gain following pallidotomy in patients with Parkinson's disease (PD).

Background: Surgical ablation of the globus pallidus internus (GPi) improves levodopa induced dyskinesias, moderately improves most other "cardinal" manifestations of PD, and has been noted to result in increased weight.

Methods: We incorporated Unified Parkinson's Disease Rating Scales (UPDRS) subscales, the Beck depression inventory and feeding questionnaire data into a linear regression model in order to determine which post-surgical change(s) may lead to weight gain over the first year following pallidotomy, n = 60.

Results: The mean weight gain 1 year after pallidotomy was 4.0 +/- 4.1 kg. Improvement in "off" motor scores (P < 0.005), especially gait subscores (P<0.0001), and to a lesser extent improvement in "on" motor scores (P<0.05) predicted weight gain. Changes in dyskinesia ratings, mood, food intake, dysphagia, levodopa dose, weight loss in the year prior to pallidotomy, age, and duration of PD did not correlate with subsequent weight gain.

Conclusion: The high correlation between post-pallidotomy weight gain and "off" motor scores, suggests that this phenomenon is related to some change in underlying homeostasis associated with changes in the cardinal manifestations of PD itself, rather than secondary changes resultant from the surgery.

MeSH terms

  • Dyskinesia, Drug-Induced / drug therapy
  • Eating
  • Globus Pallidus / surgery*
  • Humans
  • Levodopa / adverse effects
  • Linear Models
  • Longitudinal Studies
  • Motor Activity
  • Neuropsychological Tests
  • Nutrition Assessment
  • Parkinsonian Disorders / drug therapy
  • Parkinsonian Disorders / physiopathology*
  • Parkinsonian Disorders / surgery*
  • Severity of Illness Index
  • Smell
  • Stereotaxic Techniques
  • Surveys and Questionnaires
  • Weight Gain*


  • Levodopa