RESUMEN
Case 1 presented congestive heart failure with atrial fibrillation. Echocardiography and cardiac catheterization demonstrated mitral regurgitation and communications between the right and left coronary arteries and pulmonary artery (PA). The fistula orifice was directly closed and mitral annuloplasty was done at the same time. Case 2 had a history of open mitral commissurotomy for mitral atenosis (MS), and was diagnosed as to be re-MS. Selective coronary angiography (CAG) newly documented an aberrant artery originating from the left coronary artery and draining into the distal right PA. At operation, the origin of the aberrant artery was successfully ligated, and mitral valve was replaced with a prosthetic one. This paper presented relatively rare types of coronary artery fistulae, focusing on the importance of routine CAG before open heart surgery and of consideration on the association of this anomaly in respect to perioperative myocardial protection.