CEREBRAL CIRCULATORY CONDITIONS IN PATIENTS WITH RUPTURED ANEURYSMS MEASURED BY AN INTRAVENOUS RADIOACTIVE-INDICATOR TECHNIQUE

Abstract
A method of studying cerebral circulatory conditions is described. A radioactive isotope was injected intravenously and detected by collimated gamma detectors placed bilaterally over the head. From the indicator-dilution curve obtained, arbitrary measures of the cerebral blood flow, the mean transit time, and the cerebral blood volume were calculated. The patient was subjected to isotope tests repeatedly until the cerebral circulation was regarded as sufficient for surgery, whereupon the operation was performed immediately.