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The prehospital History, ECG, Age, Risk Factors and Troponin (preHEART) Risk Score. The five domains are assigned 0–2 points with a total score ranging from 0 to 10. Patients are then stratified into an extreme low (0–3 points), intermediate (4–7) or high (8–10) risk of major adverse cardiac events category. Abbreviations: LBBB, Left Bundle Branch Block, PM, Pacemaker
