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NEUROLOGY 1997;49:1278-1283
© 1997 American Academy of Neurology

Stereotactic pallidotomy lengthens the transcranial magnetic cortical stimulation silent period in Parkinson's disease

M. S. Young, MD, W. J. Triggs, MD, D. Bowers, PhD, M. Greer, MD and W. A. Friedman, MD

From the Human Motor Physiology Laboratory (Drs. Young and Triggs), and Departments of Neurology (Drs. Young, Triggs, Bowers, and Greer) and Neurological Surgery (Dr. Friedman), University of Florida, Gainesville, FL.

Address correspondence and reprint requests to Dr. William J. Triggs, Department of Neurology, Box 100236 UFHSC, Gainesville, FL 32610-0236.

We compared the duration of the EMG cortical stimulation silent period(CSSP) elicited in abductor pollicis brevis using transcranial magnetic stimulation (TMS) before and after stereotactic unilateral globus pallidus internus pallidotomy (PAL) in 12 patients with Parkinson's disease. We used TMS stimulus intensities of 200, 150, 120, and 100% of motor evoked potential(MEP) threshold before and after (86 ± 25 days) PAL. PAL increased CSSP duration at stimulus intensities of 200% of MEP threshold in the hand contralateral to the stereotactic lesion. In a subset of five patients able to remain at rest during pre-PAL testing sessions, PAL decreased the resting MEP/M-wave area ratio in the hand contralateral to the lesion at a stimulus intensity of 120% of MEP threshold. PAL did not significantly modify the effects of TMS in the hand ipsilateral to the globus pallidus lesion. The results suggest that PAL improves the function of cortical motor inhibitory circuits in Parkinson's disease.

Supported by the National Parkinson Foundation.

Presented in part at the 26th annual meeting of the Society for Neuroscience, Washington, DC, November 16-21, 1996.

Received December 26, 1996. Accepted in final form June 13, 1997.




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