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Ann Thorac Surg 1982;33:250-257
© 1982 The Society of Thoracic Surgeons

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Articles

Effect of Albumin and Mannitol on Organ Blood Flow, Oxygen Delivery, Water Content, and Renal Function during Hypothermic Hemodilution Cardiopulmonary Bypass

From the Division of Cardiothoracic Surgery, University of California, San Diego, CA

Accepted for publication April 23, 1981.

^* Address reprint requests to Dr. Utley, Division of Cardiothoracic Surgery, University of California Medical Center, 225 W Dickinson St, San Diego, CA 92103

The present study was designed to determine if the addition of albumin or mannitol to the priming solution of the pump oxygenator would diminish edema in organs, without diminishing some of the beneficial effects of hemodilution on blood flow and renal function. Tissue blood flow (15 µ spheres), water content, and renal clearances were determined in 8 animals during cardiopulmonary bypass. A 2² factorial, completely fixed experimental design was used. All animals were placed on cardiopulmonary bypass with hemodilution (hematocrit 25 ± 2%) and hypothermia (25° ± 1°C).

Albumin decreased flow to the midmyocardium of the left ventricle and to the spleen, and increased flow to the inner cortex of the kidney. Albumin caused decreased urine flow and decreased urine sodium, and also diminished renal osmolar, sodium, and free-water clearances. Both mannitol and albumin decreased lung water. Mannitol decreased water content of the outer renal cortex, and decreased flow to the inner cortex and medulla of the kidney and to the spleen. Mannitol had no significant effect on urine flow, renal plasma flow, or renal clearances. Neither albumin nor mannitol had any effect on water content of the intestine, stomach, liver, or myocardium where the greatest accumulation of water occurs with hemodilution. The effect of albumin on renal function is potentially deleterious during cardiopulmonary bypass because it decreases urine flow, and osmolar and free-water clearance.

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