North America uses the AHA standards and Europe follows the IEC. Other regions are mixed. Knowing the standards in your region ensures correct electrode placement.
1. Six Second ECG GuidebookA Practice Guide to Basic and 12 Lead ECG Interpretation, written by Tracy Barill, 2012 Introduction The ability to correctly interpret an electrocardiogram (ECG), be it a simple six second strip or a 12 lead ECG, is a vital skill... (2012), T Barill, p. 65, 138-139