الفهرس 
Diagnostic and prognostic significance of normal ECG in non-ST elevation acute coronary syndromes
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Abstract
Background: The electrocardiogram (ECG) is the most accessible and widely used diagnostic tool when patients are suspected to have acute coronary syndrome (ACS). Admission ECG findings may also provide prognostic information and rapid risk assessment in ACS patients, especially those with non-ST-segment elevation myocardial infarction (NSTEMI). (Miranda DF et al., 2018).Aim and objectives:The aim of this study is to assess the impact of the admission ECG on prognosis in the setting of non-ST elevation acute coronary syndrome,to assess the relation between the normal ECG in the setting of non-ST elevation acute coronary syndrome and the territory of ischemia by non-invasive modalities or the diseased culprit vessel in the setting of coronary angiography, and to identify the timing of ECG changes in patients with normal ECG vs abnormal ECG in non-ST elevation acute coronary syndrome.Subjects and methods:Observational single center study that enrolled 200 patients with non-STelevation acute coronary syndromes throughout one year and post discharge clinical follow up for six months targeting all causes of mortality and the MACE rate.The population was divided in two groups, based on the admission ECG. Normal ECG group includes patients presented with normal ECG, Abnormal ECG group includes patients presented with abnormal ECG. Results: The mean age of the whole study population was (57.73±10.15) years, Most of the study population were males (85%) while females presented only (15%) of the study population. Dyslipidemia and hypertension were the most common cardiovascular risk factors in our study population.78% of the whole study population didn{u2019}t have new ECG changes since admission while 22% of them developed new ECG changes and the mean time for ECG changes detection was (10.09±2.83) hours.Therewas no significant difference between the two studied groups post admissionas regards new ischemicECG changes (p = 0.172) and ischemic ECG changes timing (p = 0.414). Left main and LCX territorieswere significantly more frequent in abnormal ECG than normal ECG group (p = 0.027, p = 0.006) respectevily while LAD territory was more common in normal ECG group