Right Internal Mammary Artery Occlusion in a Patient With Failed Left Internal Mammary Artery Coronary Artery Bypass Graft Surgery Post a Laparoscopic Appendectomy for Acute Appendicitis.

Patients who present with acute myocardial infarction are often urgently evaluated for possible revascularization via coronary artery bypass graft surgery (CABG), percutaneous coronary intervention (PCI), or medical therapy alone. CABG has been shown to provide symptomatic relief as well as increased long-term survival for patients with multivessel coronary artery disease (CAD). Though venous grafts can be used to revascularize the ischemic territory, long-term patency is most successful when using pedicled coronary grafts such as the left internal mammary artery (LIMA) or right internal mammary artery (RIMA) graft. Only a fraction of patients who undergo a RIMA or LIMA will occlude their graft, and mid-graft lesions presumed secondary to atherosclerosis are even rare. For our case report, we evaluate a 72-year-old female who has had a very rare acute coronary occlusion of her mid-RIMA graft resulting in an acute apical left ventricular infarct. A heart catheterization confirmed a 100% thrombotic occlusion of the mid-RIMA-LAD, which was stented with a 2.5 x 20 mm drug-eluting stent.