心筋梗塞を契機に発見された成人三心房心

Adult Cor Triatriatum Found by Chance at the Onset of Myocardial Infarction

三心房心は非常にまれな疾患で，心房は膜様の隔壁により2腔に分かれている．さまざまな解剖学的病型を認めるが，症状の出現に関しては，左房内の交通孔の大きさや併存するその他の心疾患によって異なる．われわれは，心筋梗塞による左室拡張障害を契機に発見された三心房心の症例を経験したので報告する．

Cor triatriatum sinister is a rare congenital heart disease in which the left atrium is divided into 2 chambers by a membrane, causing resistance to the blood flow to the left ventricle. The onset of symptoms depends upon the effective size of the orifice in the membrane and the associated heart disease. Our case is a 67-year-old woman with cor triatriatum found by chance at the onset of myocardial infarction. Coronary artery bypass surgery and excision of the membrane were successfully performed. Preoperative left ventricular dysfunction was improved after surgery. Imaging examinations such as enhanced computed tomography （CT） and magnetic resonance imaging （MRI） were useful for selecting surgical approach.