In which situation would abnormal pacing impedances be indicated?

Abnormal pacing impedances are typically indicated when there is a greater than 30% fluctuation from baseline measurements. This significant variation can signal potential issues with lead positioning, electrode degradation, or changes in tissue characteristics surrounding the electrodes. In a healthy cardiac pacing system, you expect stable and consistent impedance values. A fluctuation beyond this threshold suggests that the electrical characteristics of the pacing system could be compromised, warranting further investigation to ensure patient safety and the effective functioning of the device. Monitoring pacing impedance is crucial for proper device management, especially as it can influence the overall therapeutic effectiveness of cardiac rhythm management devices.