Figure 4

Examples of augmented scenes. Examples of augmented real scenes: the power button of the ECG device is surrounded by a light green rectangle, while audio and text invite the user to press it (a); a little red spot indicates the LED to be checked by the users (b); the location of the V3 precordial electrode on the mannequin is highlighted with a red circle (c); the location of the V6 precordial electrode is highlighted with a red circle (d) please note the inclination with respect to the plane of the markers; the location of the V3 precordial electrode on a real patient is highlighted with a red circle (e); placement of the V5 precordial electrode on the patient’s thorax, the location of V5 is highlighted with a red circle (f).