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Impaired hemodynamics and neural activation?

A fMRI study of major cerebral artery stenosis

From Max-Planck-Institute of Cognitive Neuroscience (Drs. Hund-Georgiadis, Mildner, Weih, and von Cramon), Leipzig, Germany; and Department of Neurology (Dr. Georgiadis), University of Zürich, Switzerland.

Address correspondence and reprint requests to Dr. Margret Hund-Georgiadis, Max-Planck-Institute of Cognitive Neuroscience, Stephanstr. 1b, 04103 Leipzig, Germany; e-mail: hund{at}cns.mpg.de

Functional MRI motor mapping was performed in two women with unilateral high-grade stenosis of the middle cerebral artery (MCA) to determine the influence of impaired hemodynamics on the blood oxygenation level dependent (BOLD) response. In both patients no structural lesions were present in primary motor pathways. A redistribution of the motor network to the healthy hemisphere was the main indicator of chronic hemodynamic compromise.

Received October 18, 2002. Accepted in final form July 29, 2003.

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