Table 1.

Study inclusion criteria

Inclusion criteria	Definition
1	The “Reason for Visit” (free text field) for the presentation contained any of the ACS-related symptoms or keywords described in Additional file 1: Information Part 1
2	The patient was placed on a cardiac pathway care plan OR the information collected during emergency department triage (free-text), separate to the Presenting Information field above, contained any of the list of ACS-related symptoms or keywords (Additional file 1:  Information Part 1)
3	Orders were placed in the EMR for a troponin test OR a 12 lead ECG OR for any of the following investigations: coronary angiogram, exercise stress test, stress echocardiogram, sestamibi scan, CT coronary angiogram, CT pulmonary angiogram
4	The patient’s EMR contained a “Cardiac Monitoring” form, meaning that the patient had been placed on a cardiac monitoring pathway
5	The patient had a result recorded in the EMR from a sestamibi scan, CT coronary angiogram, CT aortic angiogram or CT pulmonary angiogram
6	Any of the ICD-10 Australian Modification codes recorded for an encounter started with “I21”, “I22”, “I23”, “I24” or “I25” OR the episode of care had any of the following diagnoses (SNOMED CT) recorded in the EMR: “acute myocardial infarction”, “acute non-ST segment elevation”, “acute ST segment elevation”, “acute non-q wave infarction”, “angina”
7	The encounter contained a scanned 12-lead ECG image