Prehospital stratification in acute chest pain patient into high risk and low risk by emergency medical service: a prospective cohort study.

Objectives: To describe contemporary characteristics and diagnoses in prehospital patients with chest pain and to identify factors suitable for the early recognition of high-risk and low-risk conditions.

Design: Prospective observational cohort study.

Setting: Two centre study in a Swedish county emergency medical services (EMS) organisation.