Scintillation Scanning of Kidneys

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Abstract
Renal scans were performed on 4 patients with uremia 50 minutes after the injection of 150 [mu]c of Chlormerodrin-Hg203. In all patients the right kidney was obscured by the increased radioactivity in the liver. In the first such patient the scan was initially interpreted as possible right renal hypertrophy. After the return of normal renal function in one uremic patient 2 normal size kidneys were visualized on re-scanning. Scanning 24 hours after the injection of the labeled Chlormerodrin-Hg203 does not improve the resolution of the renal scan in uremic patients. The rate of disappearance of Chlormerodrin-Hg203 from the blood is slower in uremic patients than in normals. The increased radioactivity in the liver of uremic patients is a result of decreased renal uptake and excretion of Hg203. The subsequent increased blood levels of Hg203 result in increased uptake of radioactivity by the liver. Renal scans performed with Chlormerodrin-Hg203 in uremic patients should be interpreted with caution, especially with respect to the size of the right kidney. The visualization of the liver on a renal scan suggests the presence of renal failure.