Volume 42, Issue 5 pp. 807-811
Brief Communication
Full Access

Pallidotomy for hemiballismus: Efficacy and characteristics of neuronal activity

J. I. Suarez MD

J. I. Suarez MD

Department of Neurology, Johns Hopkins University, Baltimore, Bethsda, MD

Search for more papers by this author
L. Verhagen Metman MD

L. Verhagen Metman MD

Experimental Therapeutics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD

Search for more papers by this author
S. G. Reich MD

S. G. Reich MD

Department of Neurology, Johns Hopkins University, Baltimore, Bethsda, MD

Search for more papers by this author
P. M. Dougherty PhD

P. M. Dougherty PhD

Department of Neurosurgery, Johns Hopkins University, Baltimore, Bethsda, MD

Search for more papers by this author
M. Hallet MD

M. Hallet MD

Human Motor Control Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD

Search for more papers by this author
Dr. F. A. Lenz MD, PhD

Corresponding Author

Dr. F. A. Lenz MD, PhD

Department of Neurosurgery, Johns Hopkins University, Baltimore, Bethsda, MD

Department of Neurosurgery, Meyer Building 7-113, Johns Hopkins Hospital, 600 North Wolfe Street, Baltimore, MD 21287-7713Search for more papers by this author
First published: 08 October 2004
Citations: 91

Abstract

A patient with unremitting, medically intractable hemiballismus underwent a pallidotomy that abolished his involuntary movements. Firing rates of cells in the internal segment of the globus pallidus (GPi) recorded during this procedure were significantly lower than those observed during pallidotomy for Parkinson's disease, either “on” or “off” medication. Firing patterns in hemiballismus were characterized by low-frequency modulation of the firing rate. These results are consistent with the hyperkinetic model, which suggests that hemiballismus results from decreased inhibition of the pallidal relay nucleus of the thalamus by the GPi. The efficacy of surgery in the case of hemiballismus demonstrates that pallidotomy can be an effective treatment for this condition and suggests that patterned neuronal activity in the GPi is important in the mechanism of hyperkinetic disorders.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.

click me