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Circulation. 1970;42:1185-1191

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(Circulation. 1970;42:1185.)
© 1970 American Heart Association, Inc.

The Regulation of Cerebral Blood Circulation in Subclavian Steal Syndrome

FERENC SOLTI M.D.1; MIKLÓS ISKUM M.D.1; SÁNDOR PAPP M.D.1; ESZTER TURBÓK M.D.1; JULIA NAGY M.D.1

1 From the First Department of Medicine and Fourth Department of Surgery, University Medical School, Budapest, Hungary.

Blood flow to the brain was studied in 11 patients suffering from subclavian steal syndrome. The venous isotope-dilution method was used to measure total blood flow to the brain and the dye-dilution method with intravenous administration of 50 mg of Evans blue was used to determine cardiac output. Cerebral blood flow was significantly lower in the 11 patients with subclavian steal syndrome than in the control group, and the O2 consumption of the brain was low, cerebral resistance was elevated, and the cerebral fraction of the cardiac output was decreased in comparison with the controls.

The effect of occlusion of the ipsilateral brachial artery was studied in 10 of the patients with subclavian steal syndrome. The cerebral blood flow and the cerebral fraction of the cardiac output increased significantly as a result of the occlusion in these patients.

Studies on three patients after surgical correction of the lesion in the subclavian artery showed significant improvement in the cerebral circulation.


Key Words: Cardiac output • Vascular resistance • Vertebral artery flow reversed • Cerebral blood flow fraction of cardiac output

Submitted on November 5, 1969
Accepted on December 1, 1969






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