What is this article about?
An electrocardiogram, or ECG, is a reading assessing the magnitude and direction of the electrical currents of the heart, and measuring the depolarisation and repolarisation of the cardiac muscle cells. It is important that an ECG is recorded accurately. ECG electrode placement is standardised, allowing for the recording of an accurate trace - but also ensuring comparability between records taken at different times. Poor electrode placement can result in mistaken interpretation, which may then lead to possible misdiagnosis, patient mismanagement or inappropriate procedures. Deviation of lead placement even by 20-25mm from the correct position can create clinically significant changes on the ECG, including changes to the ST-segment.