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Perera et al1 described a fatal case of acute myocardial infarction that arose from embolism of bacterial vegetation. Thromboembolic complications including myocardial infarction are common in patients with bacteraemia with or without endocarditis, but acute myocardial infarctions are seldom diagnosed during life.2 Recently, thrombectomy catheters have been used to treat acute myocardial infarctions in clinical settings.3 We report a case of acute myocardial infarction caused by bacterial embolism in a major epicardial artery, diagnosed and treated with a RESCUE thrombectomy catheter (Scimed/BSC, Natick, Massachusetts, USA).
A 64 year old man with chest pain was referred to the Division of Cardiology from the Division of Nephrology in our hospital. He had been receiving haemodialysis for 10 years and one month previously had undergone femoral–popliteal artery bypass surgery because of arteriosclerosis obliterans. After surgery, he remained in the Division of Nephrology for haemodialysis and rehabilitation. Owing to occlusion of the dialysis shunt, a transient dialysis catheter was inserted into his jugular vein one week before the onset of chest pain. He consequently developed a fever and thus the catheter was removed three days later. On the day of severe chest pain (two days after removal of the catheter) he was febrile, an ECG showed ST segment depression in leads I, II, III, aVF, and V3 to V6, and echocardiography showed lateral wall motion abnormality but no findings indicating infective endocarditis. Urgent coronary angiography showed almost abrupt occlusion of the proximal left circumflex coronary artery caused by possible thrombus (fig 1A). We immediately performed coronary aspiration with a RESCUE thrombectomy catheter (fig 1B) and as a result a large amount of material was collected. After aspiration, we performed balloon angioplasty and implanted a stent, which achieved successful reperfusion (TIMI (thrombolysis in myocardial infarction) flow grade 34). The maximum creatine kinase concentration was 880 IU/l and the patient was treated with antibiotics and anticoagulants.
The material collected by the RESCUE catheter measured 2 mm. Histological findings were Gram positive streptococcus in a fibrin thrombus (fig 2). We feared that implanting the stent without aspiration might have caused a mycotic coronary aneurysm at the location of stent implantation.5,6 The mechanism of septic coronary embolism in this case was not clear. We speculated that a small vegetation on the valve, undetected by transthoracic echocardiography, might have caused embolisation of the coronary artery or enhanced thrombogenic state due to sepsis resulting in production of bacterial thrombi. Acute myocardial infarction caused by septic embolism is usually fatal; however, thrombectomy may be useful in these cases.
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