Fifteen cases were taken at random from 200 cardiac patients on whom standard, Frank and ABC, ECG leads were taken synchronously. The ABC tracings were analysed without clinical or laboratory information being made available. Evidence is presented that ABC leads are superior to the 12-lead standard ECG system and show more significant changes than the Frank leads. It is suggested the ABC system should replace these 12-lead and Frank systems in clinical medicine owing to the much more sensitive analysis of the former and the ease of reading these leads.