Figure 94-6

Diagrammatic representation explaining why, in a left lateral plane (left lateral x'ray view), anterior chest lead V2 cannot be "reciprocal" to inferior lead AVF (left). The right sided schematic shows that ST-Segment depression in anterior chest lead V2 may reflect either anteroseptal wall subendocardio "injury" or posterobasal (true posterior) injury (transverse view from above corresponding to the electrovectorcardiographic horizontal plane). VB= unipolar chest lead (V) placed on the back of the thorax.