Contralateral flow reduction in unilateral stroke: Evidence for transhemispheric diaschisis

Abstract

Using clinical presentation, angiography, computed tomography, and nuclear magnetic resonance imaging, 7 patients were identified who had strictly unilateral hemispheric infarction and unilateral cerebrovascular disease. In 6, cerebral blood flow measured by fluorine-18-fluoromethane inhalation and positron emission tomography was reduced in the contralateral hemisphere (p<0.05). Multiple regression analysis demonstrated a high correlation between contralateral flow reduction and the degree of flow impairment in the infarcted area (r = 0.941, p = 0.0014) but not with age, risk factor profile, blood pressure, Pco2, hematocrit, or duration of stroke. We conclude that trans hemispheric diaschisis best explains the contralateral flow reduction seen in supra tentorial ischemic stroke. © 1987 American Heart Association, Inc.