It has been estimated that over 5 million patients present to emergency departments (EDs) in the United States with acute chest pain each year , Although rapid triage of these patients is crucial for optimizing treatment and improving prognosis, an effective strategy for diagnosis remains elusive in a majority of these patients. The current strategies for triage of the large subset of patients who present with acute chest pain but have normal or unchanged electrocardiograms (ECG) and negative initial cardiac enzymes provide inadequate risk stratification. This stems from the fact that the predictive value of symptom history  as well single variables such as patient age, sex, cardiac risk factors, and biochemical markers for adverse outcomes is limited [3, 4]. Moreover, symptoms of chest pain from cardiac etiologies are often similar to those from non-cardiac etiologies, further complicating accurate diagnosis .
KeywordsChest Pain Acute Coronary Syndrome Positive Predictive Value Acute Chest Pain Regional Left Ventricular Function
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