Which combination of leads is associated with the BI-V Pacer?

The combination of leads associated with the Bi-V (Biventricular) Pacer involves the right atrial (RA) lead, the right ventricular (RV) lead, and the coronary sinus (CS) lead placed in the left ventricle (LV). This configuration is designed to coordinate the timing of contractions between both ventricles, which is crucial for patients with heart failure who may experience asynchronous ventricular contraction.

The RA lead is necessary for sensing and pacing the right atrium, while the RV lead is used to pace the right ventricle. The CS lead, situated in the coronary sinus, serves to control pacing in the left ventricle to improve the overall function of the heart by optimizing the synchronization of ventricular contractions. This combination is essential for maximizing the benefits of cardiac resynchronization therapy in patients with certain types of heart failure.

Other options do not provide the comprehensive lead setup required for effective biventricular pacing. For example, a combination of RA lead and His lead focuses on a different pacing strategy that doesn’t address the synchronization of both ventricles adequately. Similarly, combinations that exclude either the RV or CS leads would not facilitate optimal biventricular pacing necessary for improving hemodynamic performance.