Minimize extraneous cognitive load on the learner

Electrocardiograms

As a non-invasive means of providing insight into the health of the heart, the electrocardiogram (ECG) is one of the most commonly performed medical tests. A basic understanding of how to interpret electrocardiograms is considered important for most physicians. The various aspects of the ECG are often shown with picture and caption (see 'Traditional' figure), requiring the learner to continually shift focus back and forth between diagram and text. This 'splitting of attention' represents a cognitive task that does not contribute to understanding ECGs.

An interactive diagram (see 'New' figure) integrates the ECG with explanatory information, something that would be difficult to accomplish in a non-interactive format due to the amount of information involved. In addition, by revealing the visual annotations after first attempting interpretation, the learner can use the diagram as a method of self assessment. Use the buttons in the 'New' diagram to display information about the ECG.