Which lead is considered useful for assessing ventricular rhythms?

The lead that is generally considered most useful for assessing ventricular rhythms is Lead V6. Lead V6 provides a view of the heart's left lateral wall and offers a clear representation of the electrical activity as it spreads through the ventricles. This is particularly valuable when evaluating conditions such as ventricular tachycardia or other changes related to the ventricles, as it allows for a more effective assessment of the ventricular depolarization and repolarization processes.

Leads 1, 2, and 3 primarily provide a view of the heart's electrical activity in the frontal plane; they are beneficial for assessing atrial rhythms and overall heart axis but may not provide the same clarity for ventricular rhythm interpretation as Lead V6. Thus, for assessing synchrony and abnormalities in the ventricular contractions, Lead V6 is the preferred lead.