Abstract: Objective to describe the general characteristics of patients with acute chest pain in order to analyze factors associated with patients' utilization of emergency medical services (EMS).

摘要：目的分析急性胸痛患者的基本特征，探讨其选择使用院前急救医疗服务(EMS)的影响因素。

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In every corner of our country, emergency medical services (EMS) practitioners are hard at work delivering hope and care to Americans in dire circumstances.

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