$0.99. This is a great app for use on the floor both as a quick reference guide and a teaching tool. It covers the basics of ECG interpretation as well as the detection of common pathologies including ischaemia, arrhythmias, chamber enlargement and electrolyte disturbances. There is a useful paediatric section with expected age-appropriate HR and ECG intervals. Another highlight is the ability to perform a quick search of high definition ECG samples. The ECG quiz is a great learning resource with 100 questions ranging from rhythm strip analysis to recalling criteria for chamber enlargement/STEMI. An ECG ‘interpreter’ functions as a decision tree aimed to aid making a differential diagnoses and is based on the ACC/AHA ECG guidelines.