The five-lead EASI* (reduced lead continuous 12-lead ECG) configuration gives a three-dimensional view of the electrical activity of the heart from the frontal, horizontal, and sagittal planes. This provides 12 leads of information. A mathematical calculation in the electronics of the monitoring system is applied to the information, creating a derived 12-lead ECG.

Placement of the electrodes for the EASI* system includes:

• E lead: Lower part of the sternum at the level of the fifth intercostal space
• A lead: Left midaxillary line at the level of the fifth intercostal space
• S lead: Upper part of the sternum
• I lead: Right midaxillary line at the level of the fifth intercostal space
• Ground: Anywhere on the torso