On-pump beating-heart technique for managing a ruptured left coronary artery aneurysm.

We present the case of an 86-year-old woman with a ruptured left coronary artery aneurysm associated with coronary-pulmonary artery fistula. She was transferred to our hospital with complaints of chest discomfort. Echocardiography revealed cardiac tamponade, and subsequently, a bloody pericardial effusion was drained. Coronary angiography and computed tomography revealed a ruptured left coronary artery aneurysm originating from a branch of the proximal left anterior descending artery and a coronary-pulmonary artery fistula. In the emergency operation, under cardiopulmonary bypass, the inlet and outlet vessels were ligated, and the aneurysm was closed without arresting the heart. By utilizing cardiopulmonary bypass, the pulmonary trunk was easily decompressed, and dissection around the aneurysm and identification of the inlet and outlet vessels was facilitated without cardiac arrest. Thus, to conclude, an on-pump beating-heart technique should be considered in such cases.