Which lead is part of a traditional BI-V Pacer configuration?

The choice identifying the traditional bi-ventricular (BI-V) pacer configuration includes the right atrial (RA) lead, the right ventricular (RV) lead, and the coronary sinus (CS) lead for the left ventricle (LV). This configuration is designed to improve synchronization of the heart's pumping action in patients with heart failure or left bundle branch block.

In a standard BI-V pacer setup, the RA lead captures the electrical activity of the right atrium, ensuring proper atrial contraction. The RV lead is appropriately positioned within the right ventricle to stimulate ventricular contraction. The CS lead is placed in the coronary sinus to pace the left ventricle, which is crucial for achieving coordinated contraction between the left and right ventricles. This triad of leads enhances cardiac output and improves overall heart function by facilitating optimal ventricular synchronization.

Other options lack one or more necessary components for a complete BI-V pacing system. For example, configurations with only a single lead, like the RA lead or the CS lead alone, cannot adequately pace both ventricles, thus failing to provide the advantages of bi-ventricular pacing.