What does impedance measure in a pacing system?

Impedance in a pacing system specifically measures the total resistance offered by the pacing leads. This resistance is an important factor because it provides insight into the integrity and functionality of the leads themselves, as well as the overall connection between the pacemaker and the myocardium (heart muscle). When impedance values are analyzed, they help clinicians determine if there are any issues such as lead displacement, fractures, or other malfunctions that may affect the delivery of electrical impulses to the heart.

Monitoring impedance is essential for ensuring optimal pacing, as significant changes in impedance readings can indicate that intervention may be necessary, such as repositioning the leads or addressing changes in the pacing threshold. Thus, understanding impedance and its role within the pacing system is fundamental for effective patient care in cardiac pacing.