Left ventricular systolic dysfunction among nocturnal myocardial infarctions

Background and Objective: Diurnal variation in the onset of acute myocardial infarction with a peak in the morning has been demonstrated. Few data are available concerning about the left ventricular systolic dysfunction according to the infarct time. Regarding importance of onset of heart failure following acute myocardial infarction, this study was done to survey the effect of the time of acute myocardial infarction on left ventricular systolic dysfunction. Methods: This prospective study was performed on 100 patients with acute myocardial infarction (AMI). Left ventricular systolic dysfunction (LVSD) was defined by echocardiography when ejection fraction (EF) was less than 55%. Findings: Of these patients, 72 had EF