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Association Of Duration Of QRS Complexes On ECG With Left Ventricular Diastolic Dysfunction In ST Elevation Myocardial Infarction Andro Diasmada1, Mustika Mahbubi1 , Hasanah Mumpuni2, Erika Maharani3 1 Department Cardiology and Vascular, Faculty of Medicine Universitas Gadjah Mada – Dr. Sardjito Hospital Yogyakarta, Indonesia 2 Echocardiography Division of Department Cardiology and Vascular, Faculty of Medicine Universitas Gadjah Mada – Dr. Sardjito Hospital Yogyakarta, Indonesia 3 Arhytmia Division of Department Cardiology and Vascular, Faculty of Medicine Universitas Gadjah Mada – Dr. Sardjito Hospital Yogyakarta, Indonesia Background. The 12-lead electrocardiogram (ECG) is the most readily available noninvasive test for the detection of cardiac disease. Several studies have shown that a normal 12-lead ECG in patients is a relatively sensitive and specific marker for normal left ventricular (LV) function. In patients with LV dysfunction and prior myocardial infarction, various electrocardiographic scoring systems have been developed to estimate LV function, but their utility has been limited. Aims. To investigate whether duration of QRS complex on ECG is related to diastolic dysfunction in acute myocardial infarction patients. Methods. This study population enrolling 87 patients with ST-elevation acute myocardial infarction. The inclusion criteria were patients, 18-80 years old, Acute Myocardial Infarction onset < 12 hours, no history of infarction, PCI and fibrinolitic. The exclusion criteria were documented atrioventricular block, chronic heart failure, congenital heart disease, valvular heart disease, consumption of amiodaron,verapamil, phonobarbital and propanolol, got cardiac resynchronization therapy. A prolonged QRS duration defined as a QRS>0.10 s. Diastolic dysfunction is defined as restrictive, pseudonormal, and relaxation type of diastolic dysfunction. Echocardiography was performed to all patients. Results. The QRS duration shows that 26% patients had prolonged QRS on ECGs (pQRS + group). The two groups were similar in term of baseline characteristics. and there were 74% who did not have pQRS on their ECGs (pQRS - group). In patients with abnormal diastolic function, the median of QRS complex was longer (89ms VS 80ms, p=0,603). However, QRS duration did not significantly differ between groups. Conclusion. The presence of prolonged QRS complexes on ECG didn’t predict diastolic dysfunction in patient ST elevation myocardial infarction. Keywords. Prolonged QRS, ST-elevation myocardial infarction, diastolic dysfunction