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(Stroke. 1973;4:73.)
© 1973 American Heart Association, Inc.

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Arterial Peaks in Regional Cerebral Blood Flow ¹³³Xenon Clearance Curves

STEPHEN G. ROSENBAUM B.A.¹; LINNETTE D. ILIFF B.SC, M. PHIL., PH.D.¹; J. W. D. BULL M.D., F.R.C.P., F.F.R.¹; G. H. DU BOULAY M.B., M.R.C.P., F.F.R.¹; JOHN MARSHALL M.D., F.R.C.P. (ED.), F.R.C.P. (LOND.), D.P.M.¹; R. W. ROSS RUSSELL M.A., M.D., D.M., F.R.C.P.¹; LINDSAY SYMON F.R.C.S. (ED.), F.R.C.S. (ENG.)¹

¹ Institute of Neurology, National Hospital for Nervous Diseases, Queen Square, London, WC1N 3BG, England

In patients with normal rCBF, arterial spikes are found in all regions of the cerebral hemisphere. The normal range of spike height is 17% to 31 % of H max, except over the carotid siphon (region 15), when it is 36% to 38%.

Under general anesthesia proportionate spike height increases significantly when CBF is low. Increased blood flow is not, however, significantly associated with decrease in spike height.

The possible explanations for this are discussed.

Key Words: cerebral hemisphere • carotid siphon • scintillation counters • isotope • arteriovenous malformations