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Side-Branch of Internal Mammary Artery Bypass Graft Causing Coronary Steal

Department of Cardiovascular Surgery 1 Department of Cardiology Catanzaro University Medical School Catanzaro, Italy

For reprint information contact: Pasquale Mastroroberto, MD Corso Vittorio Emanuele 58 Salerno 84123, Italy Tel: 39 89 22 9039 Fax: 39 89 22 9039 Email: pasmas{at}general.it

A case of coronary steal syndrome caused by a large unligated branch of the left internal mammary artery in a patient who had undergone myocardial revascularization is described. The presence of recurrent angina, a positive exercise stress test, and repeat angiography showing a lateral branch of the mammary artery led to a diagnosis of the coronary steal phenomenon. Surgical ligation of the branch was performed and the patient became symptom-free with a negative exercise stress test.