Prediction of left ventricular function in patients after acute myocardial infarction treated with primary angioplasty

Background: Despite a substantial reduction in in-hospital mortality, the long-term outcomes of patients with acute ST-elevation myocardial infarction (STEMI) undergoing primary percutaneous transluminal coronary angioplasty (PTCA) remain uncertain. The main causes include progressive left ventricle (LV) remodelling and impaired LV systolic function with a decreased ejection fraction (EF). B-type natriuretic peptide testing has recently emerged as an innovative approach that might enhance the echocardiography-based risk stratification after STEMI. The aims of the study included long-term echocardiographic assessment of LV function and remodelling in patients with STEMI treated with PTCA. Additionally, evaluation of the N-terminal pro-brain natriuretic peptide (NT-proBNP) plasma level utility was performed to identify factors at patient discharge which would enable to predict LV dysfunction and remodelling after STEMI at 6-month follow-up. Methods: Echocardiography was performed in 98 patients at discharge and at 6-month follow-up. The diameters of the heart chambers and indices of LV systolic and diastolic function were measured. Plasma levels of NT-proBNP were measured before PTCA and at 6 months. Results: Primary PTCA successfully restored normal epicardial blood flow in the infarctrelated Artery (IRA) in 96 patients. At 6 months preserved LV systolic function (median EF 47.5%), decreased LV diastolic function with relaxation abnormalities (E/A < 1.0 and IVRT > 105 ms) and no significant increase in left ventricular end-diastolic diameter (LVEDD) Address for correspondence: Dr med. Iwona Świątkiewicz Chair and Department of Cardiology and Internal Diseases Collegium Medicum in Bydgoszcz Nicolaus Copernicus University, Toruń Marii Skłodowskiej-Curie 9, 85–094 Bydgoszcz, Poland Tel: +48 52 585 40 23; fax: +48 52 585 40 24 e-mail: [email protected] Financial assistance: research grant 54/2004 from the Ludwik Rydygier Collegium Medicum in Bydgoszcz. Received: 21.07.2006 Accepted: 2.10.2006