Weight gain following unilateral pallidotomy in Parkinson's disease.
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.


CONCLUSIONS
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.
Ondo
W G
WG
Department of Neurology, Baylor College of Medicine, Houston, TX, USA.
Ben-Aire
L
L
Jankovic
J
J
Lai
E
E
Contant
C
C
Grossman
R
R
D004409:Dyskinesia, Drug-Induced / Q000188:drug therapy; D004435:Eating; D005917:Globus Pallidus / Q000601:surgery*; D006801:Humans; D007980:Levodopa / Q000009:adverse effects; D016014:Linear Models; D008137:Longitudinal Studies; D009043:Motor Activity; D009483:Neuropsychological Tests; D015596:Nutrition Assessment; D020734:Parkinsonian Disorders / Q000188:drug therapy / Q000503:physiopathology* / Q000601:surgery*; D012720:Severity of Illness Index; D012903:Smell; D013238:Stereotaxic Techniques; D011795:Surveys and Questionnaires; D015430:Weight Gain
D007980:Levodopa