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Ann Thorac Surg 1981;32:68-74
© 1981 The Society of Thoracic Surgeons

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Articles

Use of Cold Cardioplegic Solution for Vein Graft Distention and Preservation: A Light and Scanning Electron Microscopic Study

From the Division of Cardiothoracic Surgery, the University of Texas Medical Branch, Galveston, TX

^* Address reprint requests to Dr. Williams, Division of Cardiothoracic Surgery, The University of Texas Medical Branch, Galveston, TX 77550

To evaluate the effect of a cardioplegic solution on the endothelium of the saphenous vein, portions of this vein were harvested from each of 5 patients undergoing coronary artery bypass operation. Each sample was divided into five segments. One segment was distended with heparinized saline solution, one with heparinized blood, and one with heparinized cardioplegic solution (25 mEq of potassium per liter). All of the distending solutions were kept at 10°C, and pressure was carefully limited to 200 mm Hg. The fourth segment of vein was distended with heparinized saline solution but no effort was made to limit distending pressure, and the fifth segment was not distended. All samples were then examined with light and scanning electron microscopy.

There were no great morphological differences in the endothelium of veins distended to 200 mm Hg with saline solution, blood, or cardioplegic solution. The morphology of these samples compared favorably with the control vein endothelium although scattered areas of endothelial disruption were present in every sample. Veins distended without pressure control showed massive endothelial disruption. The particular solution used to distend the saphenous veins is not as important as limiting the distending pressure.

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