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(Stroke. 1970;1:253.)
© 1970 American Heart Association, Inc.

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Cerebral Blood Flow and Internal Carotid Artery Flow During Carotid Surgery

GUDRUN BOYSEN M.D.¹; H. J. LADEGAARD-PEDERSEN M.D.²; N. VALENTIN M.D.²; H. C. ENGELL M.D.²

¹ Surgical Laboratory of Circulation Research, Surgical Department D, Rigshospitalet, DK-2100, Copenhagen, Ø, Denmark
² Surgical Laboratory of Circulation Research, Surgical Department D, and Department of Anesthesiology, The University Hospital, Rigshospitalet, Copenhagen, Denmark

In a series of 17 patients operated on for stenosis of the internal carotid artery, measurement of the blood flow in the internal carotid artery by a squarewave electromagnetic flowmeter was performed simultaneously with measurement of the regional cerebral blood flow (rCBF) by the ¹³³Xenon injection technique. The measurements were made before and after endarterectomy. On completion of endarterectomy there was significant increase in mean internal carotid artery flow (ICAF), from 133 ml/min to 212 ml/min (P<0.05), whereas mean rCBF remained unaltered.

The ratio ICAF/rCBF gives brain substance in grams supplied by the internal carotid artery. The mean value of this ratio increased significantly from 231 gm to 452 gm after endarterectomy (P<0.01). Thus cerebral hemodynamics tended to the normal postoperatively.

Key Words: cerebral transient ischemic attacks • ¹³³Xenon • electromagnetic flowmetry • carotid stenosis

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