What value of impedance indicates high impedance?

In the context of cardiac pacing, impedance is a crucial measurement that indicates the resistance to electrical current flow within the pacing lead system. A high impedance value typically signifies poor lead contact, which can potentially affect the effectiveness of pacing. When impedance values exceed 3000 ohms, it is generally considered high impedance in the clinical setting.

Impedance values are monitored during device programming and follow-up to ensure that the pacing leads are functioning correctly. If the impedance is higher than the established thresholds, it may prompt further investigation or intervention to address potential issues with the lead or its connection to the myocardium. Values exceeding 2000 ohms, 1500 ohms, or 1000 ohms could indicate varying degrees of resistance but do not necessarily reach the threshold deemed problematic unless they exceed 3000 ohms. Thus, the value that most clearly indicates high impedance in this context is exceeding 3000 ohms.