Final answer:
In a normal EKG, lead aVR typically shows a predominantly negative QRS complex, which is due to the direction of electrical depolarization in the heart relative to the aVR electrode.
Step-by-step explanation:
In the normal EKG, the QRS complex is predominantly negative in lead aVR. This observation can be explained by the direction of the heart's electrical depolarization relative to the position of the aVR electrode. Lead aVR looks at the electrical activity from the right shoulder towards the center of the heart where there is more negative electrical activity during ventricular depolarization, resulting in a mainly negative QRS complex.
The Lead aVR in a normal EKG is predominantly negative for the QRS complex. The QRS complex represents the depolarization and contraction of the ventricles and is typically positive in most leads.
However, in lead aVR, the QRS complex is negative because the electrical vectors are directed away from this lead. This means that the electrical activity in the heart is moving in the opposite direction to this lead, resulting in a predominantly negative QRS complex.