The Relationship of Renal Blood Flow to Cardiac Output in Normal Individuals as Determined by Concomitant Radioisotopic Measurements

Renal blood flow and cardiac output were determined in normal men using single injection radioisotopic techniques. These methods use external monitoring to obviate the discomforts and difficult chemical determinations of older methods. The average cardiac index of 3·36 ± 0·35 l./min/m2 and the average renal blood flow of 629 ± 70·0 ml./min/m2 compare favourably with previously reported values.