ocr: Resident and Staff PhysicaM Patiant Education Chart Posterobasal Myocardial Infarction Posterior Infarcts (Infarcts on the back surtace of the heart) Posterobasal Infarct: Caused by occlusion of the circumtlex branch of the left coronary artery (due to variations of vessel distributions). Reprinted with permission from Resident and: Staff Physician (c)1991-92, 1993 byl Romaine Pierson/Publishers, Inc.