—Unitl 1981, it was widely accepted that the neurological deficits that occurred during attacks of classic migraine (CM) were caused by reduced blood flow and ischemia during the aura phase. However, in 1981 Olesen et al1 described seven patients in whom cerebral blood flow (CBF) was recorded during the aura. The authors concluded that "the reduction in rCBF [regional cerebral blood flow] was not of sufficient magnitude to explain the symptoms except in one of seven patients." In 1983, Lauritzen et al2 described rCBF studies in nine patients in whom, during migraine aura, "the mean regional perfusion in the oligemic areas was 40 mL/100 g per minute, well above the threshold for producing neuronal damage by ischemia," concluding that "this quantitative consideration supports our conclusion that ischemia is not of primary importance in the development of focal migraine symptoms." Small areas of ischemia were, however, observed
Olsen TS, Friberg L. Ischemia May Be the Primary Cause of Neurological Deficits in Classic Migraine-Reply. Arch Neurol. 1990;47(2):125–127. doi:10.1001/archneur.1990.00530020018006
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