To assess the use of 3D-Vector ECG, a target of 1000 12-lead ECGs are to be retrieved from the electrocardiographs at SGH Emergency Department triage, with the post-analysis to be done at NHCS. The retrieved ECGs will be converted to 3D-vector ECG and analysed to extract discriminating parameters which can be reliably used to diagnose and localise the presence of ischaemia. Accuracy of the diagnoses will be counter checked with the results of further diagnostic tests performed on the patient in the normal course of treatment. From the analysis of these 1000 records, the sensitivity and specificity of the 3D-Vector ECG to localise acute coronary syndrome will be computed.