Studies of the cerebral circulation with labeled erythrocytes in healthy man.

IN EARLIER papers, " we have studied cerebral blood flow, cerebral blood pool, circulation times, and other parameters of the circulation in a control group and in cases of cerebrovascular diseases. In the last paper, we published mean values for a small control group of 11 patients, most of them epileptics. We obtained high values for both cerebral blood flow and cerebral blood pool in this control group. The percutaneous puncture of the carotid arteries was not performed high enough in the neck to avoid regurgitation of injected labeled erythrocytes into the external carotid artery.