(Stroke. 1999;30:1019-1024.)
© 1999 American Heart Association, Inc.
Original Contributions |
Compensatory Mechanisms for Chronic Cerebral Hypoperfusion in Patients With Carotid Occlusion
From the Mallinckrodt Institute of Radiology (C.P.D., T.O.V., R.L.G., W.J.P.); Department of Neurology and Neurological Surgery (T.O.V., S.M.F., D.A.C., R.L.G., W.J.P.); and Lillian Strauss Institute of the Jewish Hospital of St Louis (W.J.P.), Washington University School of Medicine, St Louis, Mo.
Correspondence to Dr Colin P. Derdeyn, 510 S Kingshighway Blvd, St Louis, MO 63110. E-mail derdeyn{at}mirlink.wustl.edu
Background and Purpose—The purpose of this experiment was to assess long-term cerebral hemodynamic and metabolic changes in patients with increased oxygen extraction fraction (OEF) in the hemisphere distal to an occluded carotid artery who remain free of stroke.
Methods—Ten patients with increased OEF and no interval stroke underwent repeated positron emission tomography examinations 12 to 59 months after the initial examination. Quantitative regional measurements of cerebral blood flow, cerebral blood volume, cerebral rate of oxygen metabolism (CMRO2), and OEF were obtained. Regional measurements of the cerebral rate of glucose metabolism (CMRGlc) were made on follow-up in 5 patients. Statistical significance (P<0.05) was measured with t tests and linear regression analysis.
Results—The ipsilateral/contralateral OEF ratio declined from a mean of 1.16 to 1.08 (P=0.022). Greater reductions were seen with longer duration of follow-up (P=0.023, r=0.707). The cerebral blood flow ratio improved from 0.81 to 0.85 (P=0.021). No change in cerebral blood volume or CMRO2 was observed. CMRGlc was reduced in the ipsilateral hemisphere (P=0.001 compared with normal), but the CMRO2/CMRGlc ratio was normal.
Conclusions—Increased OEF improves in patients with carotid occlusion and no interval stroke. This improvement in OEF is due to an improvement in collateral blood flow.
Key Words: blood flow • carotid artery occlusion • glucose metabolism • hemodynamics • oxygen
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