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Scanning Electron Microscope Study of Coronary Bypass Grafts

Ari L. J. Harjula, MD; Severi Mattila, MD; Antero Järvinen, MD; Hannu Myllärniemi, MD; Markku Salmenperä, MD

Arch Surg. 1984;119(8):946-949.

Abstract
• Scanning electron microscope studies of coronary bypass grafts were carried out in six routine bypass operations. Infusion of the initial crystalloid cardioplegic medium into the aortic root after aortic cross clamping was performed in every case. In two cases, pieces of aorta below and above the cross-clamped site, ie, having and not having had contact with the crystalloid cardioplegic medium, were studied. The endothelial lining of the veins showed normal structure following distention with blood. Following infusion with a crystalloid cardioplegic solution, the endothelial cells had almost completely vanished and the flow surface was composed mainly of collagen fibers. The aortic samples taken from below the cross-clamp site showed similar destruction of the endothelium that was observed in vein grafts after crystalloid cardioplegic solution infusion, whereas the aortic samples taken from above the cross-clamp site disclosed normal endothelium.

(Arch Surg 1984;119:946-949)

Author Affiliations
From the Department of Thoracic and Cardiovascular Surgery (Drs Harjula, Mattila, Järvinen, and Salmenper) and the Institute of Electron Microscopy (Dr Myllärniemi), University of Helsinki.

Footnotes
Accepted for publication Jan 25, 1984.

Reprint requests to Department of Thoracic and Cardiovascular Surgery, Helsinki University Hospital, Haartmaninkatu 4, 00290 Helsinki 29, Finland (Dr Harjula).

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