Gaze related enhancement of hemispheric blood flow in a stroke patient

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Abstract

Objective-A patient with a right posterior cerebral artery territory infarction and a left superior quadrantanopia exhibited improvement on various visual tasks including Goldmann perimetry during extreme right gaze. The phenomenon was investigated by functional imaging of cerebral blood flow. Methods-[99mTc]HMPAO SPECT was carried out while the patient gazed to the right and to the left at an 8 Hz flash stimulus. Results-When compared with left gaze, photic stimulation during right gaze was associated with an up to 39.8% increase in regional cerebral blood flow in the damaged right hemisphere, including Brodmann's areas 3-1-2, 7, 21, 22, 39, and 40. Conclusions-These gaze related alterations in function and synaptic activity suggest the engagement of a novel arousal-like mechanism that may account in part for comparable findings in patients with neglect and other disorders, and may have relevance to rehabilitation.

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Nadeau, S. E., Crosson, B., Schwartz, R. L., & Heilman, K. M. (1997). Gaze related enhancement of hemispheric blood flow in a stroke patient. Journal of Neurology Neurosurgery and Psychiatry, 62(5), 538–540. https://doi.org/10.1136/jnnp.62.5.538

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