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Ann Thorac Surg 1989;47:441-449
© 1989 The Society of Thoracic Surgeons

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Articles

Thermal coronary angiography: A method for assessing graft patency and coronary anatomy in coronary bypass surgery

Division of Thoracic and Cardiac Surgery, Department of Surgery, and Division of Cardiology, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA

Accepted for publication October 5, 1988.

^_* Address reprint requests to Dr Mohr, Cardiovascular Surgery, University Hospital Bonn, Sigmund Freud Str 25, 5300 Bonn 1, West Germany.

Thermal coronary angiography was evaluated in 50 patients undergoing 137 saphenous vein and 48 internal mammary artery bypass grafts. A total of 177 thermal coronary angiograms were performed after completion of the distal anastomoses by injection of cold cardioplegia into the vein or by reperfusion with warmer blood in the internal mammary artery grafts. These angiograms provided details of graft and anastomosis patency, flow directions, and presence of native coronary stenoses. Temperature differences between the injectant and the epimyocardium of greater than 4 °C resulted in high-contrast images. Thermal coronary angiograms were obtained in 173 of the 177 studied bypass grafts; 172 grafts were patent, and 1 internal mammary artery graft was occluded. Unsuspected stenoses wen detected at the site of four distal anastomoses. Subsequently, two anastomoses were successfully revised and three additional grafts performed. Ninety-six native coronary stenoses were located in the recipient coronary arteries. In ten instances, the thermal coronary angiograms were obscured by excess fat or myocardium, thereby impeding correct image analysis. We conclude that thermal coronary angiography can be clinically relevant and helps improve decision making during coronary artery bypass operations.

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