Question

An EKG technician is evaluating a standard 12-lead EKG tracing during a recording. The technician should recognize that electrical activity of the septal wall is recorded by which of the following leads?

a) Lead I
b) Lead II
c) Lead III
d) Lead aVR

Answer 1

The septal wall's electrical activity during a standard 12-lead EKG is best recorded by the precordial leads V1 and V2, not the limb leads (such as Lead I, Lead II, Lead III, and aVR).

Step-by-step explanation:

The electrical activity of the septal wall in a standard 12-lead EKG tracing is predominantly recorded by lead V1 and lead V2. These leads are placed on the chest and are part of the precordial leads, which directly face the septum. The septal wall's activity is primarily reflected in the earlier part of the QRS complex, where small deflections called the Q waves can often be seen. While the limb leads (Lead I, Lead II, Lead III, and aVR) provide valuable information about the heart's electrical activity, they do not specifically target the septal wall to the extent that the precordial leads V1 and V2 do.