What electrical event in the heart is primarily restored by conduction system pacing?

Conduction system pacing is primarily designed to restore the synchronization of atrial and ventricular contractions. This is especially important in patients with specific types of heart block, where the electrical signals that coordinate these contractions are disrupted.

In a healthy heartbeat, the atria contract first, followed closely by the ventricles. This precise timing ensures efficient blood flow from the atria to the ventricles and then out to the rest of the body. When conduction system pacing is utilized, such as with His bundle pacing or left bundle branch pacing, it aims to achieve this synchronization by directly stimulating the appropriate sites within the heart's conduction system. This helps to mimic the natural pacing of the heart and improve overall cardiac output and function.

While the depolarization of the ventricles, repolarization of the atria, and relaxation phase of the heart are important aspects of the cardiac cycle, conduction system pacing specifically addresses the issue of coordination between the atrial and ventricular contractions, making it a key factor in managing certain heart rhythm disorders.