What is the primary function of the leads in a cardiac rhythm management system?

The primary function of the leads in a cardiac rhythm management system is to deliver electrical energy to the heart. Leads are specialized wires that connect the implantable device, such as a pacemaker or defibrillator, to the heart muscle. Their role is crucial because when the device detects an irregular heartbeat or requires pacing, the leads transmit electrical impulses from the device directly to the cardiac tissue, helping to regulate the heart's rhythm effectively.

While leads also play a role in monitoring physiological signals—sending information back to the device about the heart's activity—the key purpose remains the delivery of electrical energy to stimulate contractions when needed. This action is vital for maintaining a normal heart rhythm and ensuring proper blood circulation, particularly in patients with arrhythmias or other heart conditions.