Gaze related enhancement of hemispheric blood flow in a stroke patient

Academic Article

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-[ 99m Tc]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.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Nadeau SE; Crosson B; Schwartz RL; Heilman KM
  • Start Page

  • 538
  • End Page

  • 540
  • Volume

  • 62
  • Issue

  • 5