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Interrelationship between Hydration, Urine Flow, Renal Blood Flow and the Radiohippuran Renogram

Case Western Reserve University, Cleveland, Ohio

Correspondence: For reprints contact: William J. MacIntyre, University Hospitals of Cleveland, University Circle, Cleveland, Ohio 44106.

ABSTRACT

Hydration had no consistent effect on the time required for the occurrence of the initial rise of radioactivity recorded during radioisotope renography. In contradistinction, the slope of the ascending limb became steeper and radioactivity reached peak value at an earlier time. The early portion of the descending limb became steeper, whereas the final part became flatter.

These changes cannot be explained by alteration in the renal blood flow since hydration did not cause any constant effect on the total renal blood flow. Furthermore, the slope of the ascending limb of the renogram cannot be used to calculate the relative blood flow to each kidney.

The advantages of recording the radiohippuran renogram under hydration consist of better equalization of the counting rates over the renal areas at the time of peak activity and elimination of the stepwise descent in radioactivity. In addition, there can be a more readily identified point of intersection of the initial rise of radioactivity and the succeeding ascending limb of the renogram.

Lastly, the effect of bladder radioactivity on the counting rates recorded by the renal detectors is shown.

FOOTNOTES

^* On leave from the Department of Medicine and Division of Nuclear Medicine, Faculty of Medicine, Cairo University, Cairo, U.A.R.