الفهرس 
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Abstract
Background; Ischemic heart disease represents the leading cause of death, emphasizing risk stratification and early therapeutic intervention. Heart rate variability (HRV), an indirect marker of autonomic nervous system activity, was investigated extensively as a risk factor for adverse cardiovascular events following acute myocardial infarction, Aim and objectives; to examine heart rate turbulence in patients with STEMI and to find out whether any relationship exists between HRT parameters and echocardiographic findings especially systolic function, Subjects and methods; This is A Case control study, was conducted at cardiology department, Mansoura University on 40 individuals divided into 2 groups: (Case group): included Adult patients (males or females) with STEMI, (Control group): included Matched age and sex population who had no cardiovascular disease, Result; In our study, we did not find a statistically significant difference regarding turbulence onset and turbulence slope, Conclusion; The abnormal TO value (≥0) and TS (<2.5) was not found to have remarkable usefulness in the distinction of cases with STEMI associated with left ventricular systolic dysfunction. Impaired TO and TS cannot be used as a useful predictor of left ventricular systolic dysfunction and poor prognosis in the peri-infarction period of STEMI. This may be attributed to limited sample size, However a number of similar studies conducted on a larger number of patients reveiled significant difference of these two variables between ST elevation myocardial infarction (STEMI) patients and control group,