What does impedance refer to in electrical pacing?

Impedance in electrical pacing refers to the total resistance to electric current flow within the pacing system. It measures how much the pacing lead and surrounding tissue oppose the flow of electricity used to stimulate the heart. A higher impedance indicates greater resistance, which may impact the effectiveness of the pacing impulse delivered to the myocardial tissue.

In the context of pacing, it is crucial to monitor impedance as it can provide valuable insights into lead function, potential lead displacement, or issues with the surrounding tissue. Consistently abnormal impedance readings may prompt further investigation to ensure optimal system performance and patient safety. Understanding impedance helps clinicians make informed decisions about pacing therapy management.