Need a quick reference for EKG interpretations with myocardial infarction (MI) locations? Get our Rapid ID card that contains a quick and easy way to find infarction locations based on EKG ST segment changes. Locate the coronary artery responsible for the MI with our simple chart and anatomical model. Carry this card behind your hospital or ID badge for rapid referencing and daily use. Flip the card over for the EKG standard measures (QRS complex, QRS interval, ST segment, QT interval, PR interval) and normal valves.