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(Stroke. 1998;29:433-438.)
© 1998 American Heart Association, Inc.

Original Contributions

Natural History of Stenosis From Intracranial Atherosclerosis by Serial Angiography

Paul T. Akins, MD, PhD; Thomas K. Pilgram, PhD; DeWitte T. Cross, III, MD; Christopher J. Moran, MD

From the Department of Neurology (P.T.A.) and the Section of Neuroradiology, Mallinckrodt Institute of Radiology (T.K.P., C.J.M., D.T.C.), Washington University School of Medicine, St Louis, Mo, and Mercy Healthcare Sacramento (P.T.A.), Sacramento, Calif.

Correspondence to Paul T. Akins, MD, PhD, Mercy Healthcare Sacramento, 2825 J St, Suite 435, Sacramento, CA 95816. E-mail akins{at}cwnet.com

Background and Purpose—Knowledge of the natural history of stenoses due to intracranial atherosclerosis may be useful for evaluating possible treatments such as angioplasty.

Methods—We retrospectively reviewed records over a 7-year period to identify patients with intracranial atherosclerotic stenoses and serial angiograms. Quantitative measurements of stenoses were made in a blinded manner, and clinical outcomes were reviewed.

Results—We identified 21 patients with 45 intracranial stenoses who underwent repeat angiography at an average interval of 26.7 months. The average stenosis for all intracranial lesions was 43.9% initially and 51.8% on follow-up (P=.032). The average stenosis in the intracranial internal carotid artery (ICA) was stable (51.2% versus 52.6%). The average stenosis in the anterior cerebral artery (ACA), middle cerebral artery (MCA), and posterior cerebral artery (PCA) progressed from 32.4% to 49.7% (P=.037). Based on a minimum 10% change, 20% of intracranial ICA lesions progressed compared with 61% of ACA, MCA, and PCA lesions. Regression occurred in 14% of the intracranial ICA group and 28% of the ACA-MCA-PCA group. Cerebrovascular events were infrequent during this period, with 4 transient ischemic attacks and 1 intracerebral hemorrhage.

Conclusions—Intracranial atherosclerotic stenoses are dynamic lesions demonstrating both progression and regression.

Key Words: angioplasty • atherosclerosis • cerebral angiography • cerebral ischemia • cerebral ischemia, transient

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