Patients are excluded if they are diagnosed with a "type 2 myocardial infarction", i.e. myocardial ischaemia due to mismatch between myocardial oxygen demand and supply due to conditions such as severe anaemia, arrhythmia or hypotension. Patients are also excluded if they are not referred for coronary angiography, if they have atrial fibrillation or if they have cardiac failure with LVEF ≤ 40%.