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. 2021 Aug 9;38(11):814–819. doi: 10.1136/emermed-2020-210212

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Study flow diagram. ED, emergency department; EMS, emergency medical services; HEART, history, ECG, age, risk factors and troponin; MACE, major adverse cardiac event; preHEART, prehospital HEART; STEMI, ST-elevation myocardial infarction.