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First medical contact
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FMC
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Time point when the patient is initially assessed by a physician, paramedic, nurse or trained EMS personnel who can obtain and interpret the ECG and deliver initial interventions. FMC can be in the pre-hospital setting or upon arrival at the hospital. In all scenarios, STEMI diagnosis via ECG should be obtained within 10 minutes.
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Time of reperfusion
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TOR
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The time point of either a wire crossing the occlusion or the start of administration of lytic therapy.
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Total ischaemic time
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TIT
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The time from symptom onset until reperfusion is a strong predictor of patient outcomes. TIT comprises patient delay and system delay.
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Patient delay
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PD
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Time interval between symptom onset and FMC.
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System delay
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SD
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Time interval between FMC and time of reperfusion.
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Door-in-door-out time
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DIDO
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Time between patient arrival in a non-pPCI centre and the transfer to a pPCI centre.
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ECG: electrocardiogram; EMS: emergency medical services; pPCI: primary percutaneous coronary intervention; STEMI: ST-segment elevation infarction
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